7:01 p.m.
Add a schema that describes the properties of virtual machine firmware.
Each firmware executable installed on a host system should come with a
JSON file that conforms to this schema, and informs the management
applications about the firmware's properties.
In addition, a configuration directory with symlinks to the JSON files
should exist, with the symlinks carefully named to reflect a priority
order. Management applications can then search this directory in priority
order for the first firmware executable that satisfies their search
criteria. The found JSON file provides the management layer with domain
configuration bits that are required to run the firmware binary.
Cc: "Daniel P. Berrange" <berrange(a)redhat.com>
Cc: Alexander Graf <agraf(a)suse.de>
Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org>
Cc: David Gibson <dgibson(a)redhat.com>
Cc: Eric Blake <eblake(a)redhat.com>
Cc: Gary Ching-Pang Lin <glin(a)suse.com>
Cc: Gerd Hoffmann <kraxel(a)redhat.com>
Cc: Kashyap Chamarthy <kchamart(a)redhat.com>
Cc: Markus Armbruster <armbru(a)redhat.com>
Cc: Michael Roth <mdroth(a)linux.vnet.ibm.com>
Cc: Michal Privoznik <mprivozn(a)redhat.com>
Cc: Peter Krempa <pkrempa(a)redhat.com>
Cc: Peter Maydell <peter.maydell(a)linaro.org>
Cc: Thomas Huth <thuth(a)redhat.com>
Signed-off-by: Laszlo Ersek <lersek(a)redhat.com>
---
Notes:
Folks on the CC list, please try to see if the suggested schema is
flexible enough to describe the virtual firmware(s) that you are
familiar with. Thanks!
Makefile | 9 ++
Makefile.objs | 4 +
qapi/firmware.json | 343 ++++++++++++++++++++++++++++++++++++++++++++++++++
qapi/qapi-schema.json | 1 +
qmp.c | 5 +
.gitignore | 4 +
6 files changed, 366 insertions(+)
create mode 100644 qapi/firmware.json
diff --git a/Makefile b/Makefile
index 727ef118f3d9..e088e3c1b39f 100644
--- a/Makefile
+++ b/Makefile
@@ -97,6 +97,7 @@ GENERATED_FILES += qapi/qapi-types-block.h qapi/qapi-types-block.c
GENERATED_FILES += qapi/qapi-types-char.h qapi/qapi-types-char.c
GENERATED_FILES += qapi/qapi-types-common.h qapi/qapi-types-common.c
GENERATED_FILES += qapi/qapi-types-crypto.h qapi/qapi-types-crypto.c
+GENERATED_FILES += qapi/qapi-types-firmware.h qapi/qapi-types-firmware.c
GENERATED_FILES += qapi/qapi-types-introspect.h qapi/qapi-types-introspect.c
GENERATED_FILES += qapi/qapi-types-migration.h qapi/qapi-types-migration.c
GENERATED_FILES += qapi/qapi-types-misc.h qapi/qapi-types-misc.c
@@ -115,6 +116,7 @@ GENERATED_FILES += qapi/qapi-visit-block.h qapi/qapi-visit-block.c
GENERATED_FILES += qapi/qapi-visit-char.h qapi/qapi-visit-char.c
GENERATED_FILES += qapi/qapi-visit-common.h qapi/qapi-visit-common.c
GENERATED_FILES += qapi/qapi-visit-crypto.h qapi/qapi-visit-crypto.c
+GENERATED_FILES += qapi/qapi-visit-firmware.h qapi/qapi-visit-firmware.c
GENERATED_FILES += qapi/qapi-visit-introspect.h qapi/qapi-visit-introspect.c
GENERATED_FILES += qapi/qapi-visit-migration.h qapi/qapi-visit-migration.c
GENERATED_FILES += qapi/qapi-visit-misc.h qapi/qapi-visit-misc.c
@@ -132,6 +134,7 @@ GENERATED_FILES += qapi/qapi-commands-block.h
qapi/qapi-commands-block.c
GENERATED_FILES += qapi/qapi-commands-char.h qapi/qapi-commands-char.c
GENERATED_FILES += qapi/qapi-commands-common.h qapi/qapi-commands-common.c
GENERATED_FILES += qapi/qapi-commands-crypto.h qapi/qapi-commands-crypto.c
+GENERATED_FILES += qapi/qapi-commands-firmware.h qapi/qapi-commands-firmware.c
GENERATED_FILES += qapi/qapi-commands-introspect.h qapi/qapi-commands-introspect.c
GENERATED_FILES += qapi/qapi-commands-migration.h qapi/qapi-commands-migration.c
GENERATED_FILES += qapi/qapi-commands-misc.h qapi/qapi-commands-misc.c
@@ -149,6 +152,7 @@ GENERATED_FILES += qapi/qapi-events-block.h qapi/qapi-events-block.c
GENERATED_FILES += qapi/qapi-events-char.h qapi/qapi-events-char.c
GENERATED_FILES += qapi/qapi-events-common.h qapi/qapi-events-common.c
GENERATED_FILES += qapi/qapi-events-crypto.h qapi/qapi-events-crypto.c
+GENERATED_FILES += qapi/qapi-events-firmware.h qapi/qapi-events-firmware.c
GENERATED_FILES += qapi/qapi-events-introspect.h qapi/qapi-events-introspect.c
GENERATED_FILES += qapi/qapi-events-migration.h qapi/qapi-events-migration.c
GENERATED_FILES += qapi/qapi-events-misc.h qapi/qapi-events-misc.c
@@ -581,6 +585,7 @@ qapi-modules = $(SRC_PATH)/qapi/qapi-schema.json
$(SRC_PATH)/qapi/common.json \
$(SRC_PATH)/qapi/block.json $(SRC_PATH)/qapi/block-core.json \
$(SRC_PATH)/qapi/char.json \
$(SRC_PATH)/qapi/crypto.json \
+ $(SRC_PATH)/qapi/firmware.json \
$(SRC_PATH)/qapi/introspect.json \
$(SRC_PATH)/qapi/migration.json \
$(SRC_PATH)/qapi/misc.json \
@@ -600,6 +605,7 @@ qapi/qapi-types-block.c qapi/qapi-types-block.h \
qapi/qapi-types-char.c qapi/qapi-types-char.h \
qapi/qapi-types-common.c qapi/qapi-types-common.h \
qapi/qapi-types-crypto.c qapi/qapi-types-crypto.h \
+qapi/qapi-types-firmware.c qapi/qapi-types-firmware.h \
qapi/qapi-types-introspect.c qapi/qapi-types-introspect.h \
qapi/qapi-types-migration.c qapi/qapi-types-migration.h \
qapi/qapi-types-misc.c qapi/qapi-types-misc.h \
@@ -618,6 +624,7 @@ qapi/qapi-visit-block.c qapi/qapi-visit-block.h \
qapi/qapi-visit-char.c qapi/qapi-visit-char.h \
qapi/qapi-visit-common.c qapi/qapi-visit-common.h \
qapi/qapi-visit-crypto.c qapi/qapi-visit-crypto.h \
+qapi/qapi-visit-firmware.c qapi/qapi-visit-firmware.h \
qapi/qapi-visit-introspect.c qapi/qapi-visit-introspect.h \
qapi/qapi-visit-migration.c qapi/qapi-visit-migration.h \
qapi/qapi-visit-misc.c qapi/qapi-visit-misc.h \
@@ -635,6 +642,7 @@ qapi/qapi-commands-block.c qapi/qapi-commands-block.h \
qapi/qapi-commands-char.c qapi/qapi-commands-char.h \
qapi/qapi-commands-common.c qapi/qapi-commands-common.h \
qapi/qapi-commands-crypto.c qapi/qapi-commands-crypto.h \
+qapi/qapi-commands-firmware.c qapi/qapi-commands-firmware.h \
qapi/qapi-commands-introspect.c qapi/qapi-commands-introspect.h \
qapi/qapi-commands-migration.c qapi/qapi-commands-migration.h \
qapi/qapi-commands-misc.c qapi/qapi-commands-misc.h \
@@ -652,6 +660,7 @@ qapi/qapi-events-block.c qapi/qapi-events-block.h \
qapi/qapi-events-char.c qapi/qapi-events-char.h \
qapi/qapi-events-common.c qapi/qapi-events-common.h \
qapi/qapi-events-crypto.c qapi/qapi-events-crypto.h \
+qapi/qapi-events-firmware.c qapi/qapi-events-firmware.h \
qapi/qapi-events-introspect.c qapi/qapi-events-introspect.h \
qapi/qapi-events-migration.c qapi/qapi-events-migration.h \
qapi/qapi-events-misc.c qapi/qapi-events-misc.h \
diff --git a/Makefile.objs b/Makefile.objs
index c6c9b8fc2177..6ed4e0010b10 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -9,6 +9,7 @@ util-obj-y += qapi/qapi-types-block.o
util-obj-y += qapi/qapi-types-char.o
util-obj-y += qapi/qapi-types-common.o
util-obj-y += qapi/qapi-types-crypto.o
+util-obj-y += qapi/qapi-types-firmware.o
util-obj-y += qapi/qapi-types-introspect.o
util-obj-y += qapi/qapi-types-migration.o
util-obj-y += qapi/qapi-types-misc.o
@@ -27,6 +28,7 @@ util-obj-y += qapi/qapi-visit-block.o
util-obj-y += qapi/qapi-visit-char.o
util-obj-y += qapi/qapi-visit-common.o
util-obj-y += qapi/qapi-visit-crypto.o
+util-obj-y += qapi/qapi-visit-firmware.o
util-obj-y += qapi/qapi-visit-introspect.o
util-obj-y += qapi/qapi-visit-migration.o
util-obj-y += qapi/qapi-visit-misc.o
@@ -44,6 +46,7 @@ util-obj-y += qapi/qapi-events-block.o
util-obj-y += qapi/qapi-events-char.o
util-obj-y += qapi/qapi-events-common.o
util-obj-y += qapi/qapi-events-crypto.o
+util-obj-y += qapi/qapi-events-firmware.o
util-obj-y += qapi/qapi-events-introspect.o
util-obj-y += qapi/qapi-events-migration.o
util-obj-y += qapi/qapi-events-misc.o
@@ -139,6 +142,7 @@ common-obj-y += qapi/qapi-commands-block.o
common-obj-y += qapi/qapi-commands-char.o
common-obj-y += qapi/qapi-commands-common.o
common-obj-y += qapi/qapi-commands-crypto.o
+common-obj-y += qapi/qapi-commands-firmware.o
common-obj-y += qapi/qapi-commands-introspect.o
common-obj-y += qapi/qapi-commands-migration.o
common-obj-y += qapi/qapi-commands-misc.o
diff --git a/qapi/firmware.json b/qapi/firmware.json
new file mode 100644
index 000000000000..f267240f44dd
--- /dev/null
+++ b/qapi/firmware.json
@@ -0,0 +1,343 @@
+# -*- Mode: Python -*-
+
+##
+# = Firmware
+##
+
+##
+# @FirmwareDevice:
+#
+# Defines the device types that a firmware file can be mapped into.
+#
+# @memory: The firmware file is to be mapped into memory.
+#
+# @kernel: The firmware file is to be loaded like a Linux kernel. This is
+# similar to @memory but may imply additional processing that is
+# specific to the target architecture.
+#
+# @flash: The firmware file is to be mapped into a pflash chip.
+#
+# Since: 2.13
+##
+{ 'enum' : 'FirmwareDevice',
+ 'data' : [ 'memory', 'kernel', 'flash' ] }
+
+##
+# @FirmwareAccess:
+#
+# Defines the possible permissions for a given access mode to a device that
+# maps a firmware file.
+#
+# @denied: The access is denied.
+#
+# @permitted: The access is permitted.
+#
+# @restricted-to-secure-context: The access is permitted for guest code that
+# runs in a secure context; otherwise the access
+# is denied. The definition of "secure context"
+# is specific to the target architecture.
+#
+# Since: 2.13
+##
+{ 'enum' : 'FirmwareAccess',
+ 'data' : [ 'denied', 'permitted',
'restricted-to-secure-context' ] }
+
+##
+# @FirmwareMapping:
+#
+# Collects the mapping device type and the access permissions to that device
+# for system firmware and for NVRAM slots.
+#
+# @device: The system firmware or the NVRAM slot must reside in a device of
+# this type.
+#
+# @read: Permission for the guest to read the device that maps the firmware
+# file. If the field is missing, @permitted is assumed.
+#
+# @write: Permission for the guest to write the device that maps the firmware
+# file. If the field is missing, @permitted is assumed.
+#
+# @execute: Permission for the guest to execute code from the device that maps
+# the firmware file. If the field is missing, @permitted is assumed.
+#
+# Since: 2.13
+##
+{ 'struct' : 'FirmwareMapping',
+ 'data' : { 'device' : 'FirmwareDevice',
+ '*read' : 'FirmwareAccess',
+ '*write' : 'FirmwareAccess',
+ '*execute' : 'FirmwareAccess' } }
+
+##
+# @FirmwareFile:
+#
+# Gathers the common traits of system firmware executables and NVRAM templates.
+#
+# @pathname: absolute pathname of the firmware file on the host filesystem
+#
+# @description: human-readable description of the firmware file
+#
+# @tags: a list of machine-readable strings providing additional information
+#
+# @format: If the @FirmwareDevice that this @FirmwareFile is mapped into is
+# @flash, then @format describes the block format of the drive that
+# backs the device. Otherwise, this field should be 'raw' or absent.
+# If the field is missing, 'raw' is assumed.
+#
+# Since: 2.13
+##
+{ 'struct' : 'FirmwareFile',
+ 'data' : { 'pathname' : 'str',
+ '*description' : 'str',
+ '*tags' : [ 'str' ],
+ '*format' : 'str' } }
+
+##
+# @NVRAMSlot:
+#
+# Defines the mapping properties of an NVRAM slot, and associates compatible
+# NVRAM templates with the NVRAM slot.
+#
+# @slot-id: The numeric identifier of the NVRAM slot. The interpretation of
+# @slot-id is specific to the target architecture and the chosen
+# system firmware.
+#
+# @nvram-map: the mapping requirements of this NVRAM slot
+#
+# @templates: A non-empty list of @FirmwareFile elements. Any @FirmwareFile
+# identified by this list as an NVRAM template can be copied to
+# create an actual NVRAM file, and the NVRAM file can be mapped
+# into the NVRAM slot identified by @slot-id, subject to the
+# mapping requirements in @nvram-map.
+#
+# Since: 2.13
+##
+{ 'struct' : 'NVRAMSlot',
+ 'data' : { 'slot-id' : 'uint64',
+ 'nvram-map' : 'FirmwareMapping',
+ 'templates' : [ 'FirmwareFile' ] } }
+
+##
+# @SystemFirmwareType:
+#
+# Lists system firmware types commonly used with QEMU virtual machines.
+#
+# @bios: The system firmware was built from the SeaBIOS project.
+#
+# @slof: The system firmware was built from the Slimline Open Firmware project.
+#
+# @uboot: The system firmware was built from the U-Boot project.
+#
+# @uefi: The system firmware was built from the edk2 (EFI Development Kit II)
+# project.
+#
+# Since: 2.13
+##
+{ 'enum' : 'SystemFirmwareType',
+ 'data' : [ 'bios', 'slof', 'uboot', 'uefi' ] }
+
+##
+# @SystemFirmware:
+#
+# Describes a system firmware binary and any NVRAM slots that it requires.
+#
+# @executable: Identifies the platform firmware executable.
+#
+# @type: The type by which the system firmware is commonly known. This is the
+# main search key by which management software looks up a system
+# firmware image for a new domain.
+#
+# @targets: a non-empty list of target architectures that are capable of
+# executing the system firmware
+#
+# @sysfw-map: the mapping requirements of the system firmware binary
+#
+# @nvram-slots: A list of NVRAM slots that are required by the system firmware.
+# The @slot-id field must be unique across the list. Importantly,
+# if any @FirmwareAccess is @restricted-to-secure-context in
+# @sysfw-map or in any @nvram-map in @nvram-slots, then (a) the
+# virtual machine configuration is required to emulate the secure
+# code execution context (as defined for @targets), and (b) the
+# virtual machine configuration is required to actually restrict
+# the access in question to the secure execution context.
+#
+# @supports-uefi-secure-boot: Whether the system firmware implements the
+# software interfaces for UEFI Secure Boot, as
+# defined in the UEFI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-amd-sev: Whether the system firmware supports running under AMD
+# Secure Encrypted Virtualization, as specified in the AMD64
+# Architecture Programmer's Manual. If the field is missing,
+# its assumed value is 'false'.
+#
+# @supports-acpi-s3: Whether the system firmware supports S3 sleep (suspend to
+# RAM), as defined in the ACPI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-acpi-s4: Whether the system firmware supports S4 hibernation
+# (suspend to disk), as defined in the ACPI specification.
+# If the field is missing, its assumed value is 'false'.
+#
+# Since: 2.13
+#
+# Examples:
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/seabios/bios-256k.bin",
+# "description": "SeaBIOS",
+# "tags": [
+# "CONFIG_ROM_SIZE=256"
+# ]
+# },
+# "type": "bios",
+# "targets": [
+# "i386",
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "memory",
+# "write": "denied"
+# },
+# "supports-acpi-s3": true,
+# "supports-acpi-s4": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
+# "description": "OVMF with Secure Boot and SMM-protected
varstore",
+# "tags": [
+# "FD_SIZE_4MB",
+# "IA32X64",
+# "SECURE_BOOT_ENABLE",
+# "SMM_REQUIRE"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash",
+# "write": "restricted-to-secure-context"
+# },
+# "templates": [
+# {
+# "pathname": "/usr/share/OVMF/OVMF_VARS.fd",
+# "description": "empty varstore template"
+# },
+# {
+# "pathname":
"/usr/share/OVMF/OVMF_VARS.secboot.fd",
+# "description": "varstore template with the Microsoft
certificates enrolled for Secure Boot",
+# "tags": [
+# "mscerts"
+# ]
+# }
+# ]
+# }
+# ],
+# "supports-uefi-secure-boot": true,
+# "supports-amd-sev": true,
+# "supports-acpi-s3": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/AAVMF/AAVMF_CODE.fd",
+# "description": "ARM64 UEFI firmware",
+# "tags": [
+# "AARCH64"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "aarch64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash"
+# },
+# "templates": [
+# {
+# "pathname": "/usr/share/AAVMF/AAVMF_VARS.fd",
+# "description": "empty varstore template"
+# }
+# ]
+# }
+# ]
+# }
+#
+# {
+# "executable": {
+# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_CODE-pure-efi.fd",
+# "description": "32-bit OVMF with unprotected varstore and no
Secure Boot",
+# "tags": [
+# "FD_SIZE_2MB",
+# "IA32"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "i386",
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash"
+# },
+# "templates": [
+# {
+# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_VARS-pure-efi.fd",
+# "description": "empty varstore template"
+# }
+# ]
+# }
+# ],
+# "supports-acpi-s3": true
+# }
+##
+{ 'struct' : 'SystemFirmware',
+ 'data' : { 'executable' : 'FirmwareFile',
+ 'type' : 'SystemFirmwareType',
+ 'targets' : [ 'str' ],
+ 'sysfw-map' : 'FirmwareMapping',
+ '*nvram-slots' : [ 'NVRAMSlot' ],
+ '*supports-uefi-secure-boot' : 'bool',
+ '*supports-amd-sev' : 'bool',
+ '*supports-acpi-s3' : 'bool',
+ '*supports-acpi-s4' : 'bool' } }
+
+##
+# @x-check-firmware:
+#
+# Accept a @SystemFirmware object and do nothing, successfully. This command
+# can be used in the QMP shell to validate @SystemFirmware JSON against the
+# schema, and to pretty print it.
+#
+# @sysfw: ignored
+#
+# Since: 2.13
+##
+{ 'command' : 'x-check-firmware',
+ 'data' : { 'sysfw' : 'SystemFirmware' } }
diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
index 25bce78352b8..2d6339ca8c99 100644
--- a/qapi/qapi-schema.json
+++ b/qapi/qapi-schema.json
@@ -92,4 +92,5 @@
{ 'include': 'transaction.json' }
{ 'include': 'trace.json' }
{ 'include': 'introspect.json' }
+{ 'include': 'firmware.json' }
{ 'include': 'misc.json' }
diff --git a/qmp.c b/qmp.c
index f72261667f92..fc9df5c9b05b 100644
--- a/qmp.c
+++ b/qmp.c
@@ -34,6 +34,7 @@
#include "qapi/qapi-commands-block-core.h"
#include "qapi/qapi-commands-misc.h"
#include "qapi/qapi-commands-ui.h"
+#include "qapi/qapi-commands-firmware.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qobject-input-visitor.h"
@@ -781,3 +782,7 @@ void qmp_x_oob_test(bool lock, Error **errp)
qemu_sem_post(&x_oob_test_sem);
}
}
+
+void qmp_x_check_firmware(SystemFirmware *sysfw, Error **errp)
+{
+}
diff --git a/.gitignore b/.gitignore
index 4055e12ee85d..1d8d1066d3d1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,6 +35,7 @@
/qapi/qapi-commands-char.[ch]
/qapi/qapi-commands-common.[ch]
/qapi/qapi-commands-crypto.[ch]
+/qapi/qapi-commands-firmware.[ch]
/qapi/qapi-commands-introspect.[ch]
/qapi/qapi-commands-migration.[ch]
/qapi/qapi-commands-misc.[ch]
@@ -52,6 +53,7 @@
/qapi/qapi-events-char.[ch]
/qapi/qapi-events-common.[ch]
/qapi/qapi-events-crypto.[ch]
+/qapi/qapi-events-firmware.[ch]
/qapi/qapi-events-introspect.[ch]
/qapi/qapi-events-migration.[ch]
/qapi/qapi-events-misc.[ch]
@@ -70,6 +72,7 @@
/qapi/qapi-types-char.[ch]
/qapi/qapi-types-common.[ch]
/qapi/qapi-types-crypto.[ch]
+/qapi/qapi-types-firmware.[ch]
/qapi/qapi-types-introspect.[ch]
/qapi/qapi-types-migration.[ch]
/qapi/qapi-types-misc.[ch]
@@ -87,6 +90,7 @@
/qapi/qapi-visit-char.[ch]
/qapi/qapi-visit-common.[ch]
/qapi/qapi-visit-crypto.[ch]
+/qapi/qapi-visit-firmware.[ch]
/qapi/qapi-visit-introspect.[ch]
/qapi/qapi-visit-migration.[ch]
/qapi/qapi-visit-misc.[ch]
--
2.14.1.3.gb7cf6e02401b
2:26 a.m.
Hi Laszlo,
On 07.04.2018 02:01, Laszlo Ersek wrote:
Add a schema that describes the properties of virtual machine
firmware.
Each firmware executable installed on a host system should come with a
JSON file that conforms to this schema, and informs the management
applications about the firmware's properties.
In addition, a configuration directory with symlinks to the JSON files
should exist, with the symlinks carefully named to reflect a priority
order. Management applications can then search this directory in priority
order for the first firmware executable that satisfies their search
criteria. The found JSON file provides the management layer with domain
configuration bits that are required to run the firmware binary.
[...]
+##
+# @FirmwareDevice:
+#
+# Defines the device types that a firmware file can be mapped into.
+#
+# @memory: The firmware file is to be mapped into memory.
+#
+# @kernel: The firmware file is to be loaded like a Linux kernel. This is
+# similar to @memory but may imply additional processing that is
+# specific to the target architecture.
+#
+# @flash: The firmware file is to be mapped into a pflash chip.
+#
+# Since: 2.13
+##
+{ 'enum' : 'FirmwareDevice',
+ 'data' : [ 'memory', 'kernel', 'flash' ] }
This is not fully clear to me... what is this exactly good for? Is this
a way to say how the firmware should be loaded, i.e. via "-bios",
"-kernel" or "-pflash" parameter? If so, the term "memory"
is quite
misleading since files that are loaded via -bios can also end up in an
emulated ROM chip.
[...]
+##
+# @NVRAMSlot:
+#
+# Defines the mapping properties of an NVRAM slot, and associates compatible
+# NVRAM templates with the NVRAM slot.
+#
+# @slot-id: The numeric identifier of the NVRAM slot. The interpretation of
+# @slot-id is specific to the target architecture and the chosen
+# system firmware.
+#
+# @nvram-map: the mapping requirements of this NVRAM slot
+#
+# @templates: A non-empty list of @FirmwareFile elements. Any @FirmwareFile
+# identified by this list as an NVRAM template can be copied to
+# create an actual NVRAM file, and the NVRAM file can be mapped
+# into the NVRAM slot identified by @slot-id, subject to the
+# mapping requirements in @nvram-map.
+#
+# Since: 2.13
+##
+{ 'struct' : 'NVRAMSlot',
+ 'data' : { 'slot-id' : 'uint64',
Not sure whether I've got the idea here right, so take this with a grain
of salt: Maybe 'uint64' is not flexible enough here. PAPR uses both, an
ID and a name (string), see chapter 8.3 in
https://members.openpowerfoundation.org/document/dl/469 ... but I guess
we could start with the 'slot-id' here and add a name field later if
necessary.
+ 'nvram-map' : 'FirmwareMapping',
+ 'templates' : [ 'FirmwareFile' ] } }
+
+##
+# @SystemFirmwareType:
+#
+# Lists system firmware types commonly used with QEMU virtual machines.
+#
+# @bios: The system firmware was built from the SeaBIOS project.
+#
+# @slof: The system firmware was built from the Slimline Open Firmware project.
+#
+# @uboot: The system firmware was built from the U-Boot project.
+#
+# @uefi: The system firmware was built from the edk2 (EFI Development Kit II)
+# project.
+#
+# Since: 2.13
+##
+{ 'enum' : 'SystemFirmwareType',
+ 'data' : [ 'bios', 'slof', 'uboot', 'uefi' ] }
The naming here is quite a bad mixture between firmware interface
('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
so I'd suggest to rather name them 'seabios' and 'edk2' here instead.
QEMU also ships with a couple of OpenBIOS images, so you should include
that in this list here, too.
And since the SystemFirmwareType field in the SystemFirmware struct
below is not optional, you should also include an 'other' type here. Or
make the SystemFirmwareType in SystemFirmware optional. Otherwise it's
not possible to specify other firmware implementations with this scheme.
+##
+# @SystemFirmware:
+#
+# Describes a system firmware binary and any NVRAM slots that it requires.
+#
+# @executable: Identifies the platform firmware executable.
+#
+# @type: The type by which the system firmware is commonly known. This is the
+# main search key by which management software looks up a system
+# firmware image for a new domain.
+#
+# @targets: a non-empty list of target architectures that are capable of
+# executing the system firmware
+#
+# @sysfw-map: the mapping requirements of the system firmware binary
+#
+# @nvram-slots: A list of NVRAM slots that are required by the system firmware.
+# The @slot-id field must be unique across the list. Importantly,
+# if any @FirmwareAccess is @restricted-to-secure-context in
+# @sysfw-map or in any @nvram-map in @nvram-slots, then (a) the
+# virtual machine configuration is required to emulate the secure
+# code execution context (as defined for @targets), and (b) the
+# virtual machine configuration is required to actually restrict
+# the access in question to the secure execution context.
+#
+# @supports-uefi-secure-boot: Whether the system firmware implements the
+# software interfaces for UEFI Secure Boot, as
+# defined in the UEFI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-amd-sev: Whether the system firmware supports running under AMD
+# Secure Encrypted Virtualization, as specified in the AMD64
+# Architecture Programmer's Manual. If the field is missing,
+# its assumed value is 'false'.
+#
+# @supports-acpi-s3: Whether the system firmware supports S3 sleep (suspend to
+# RAM), as defined in the ACPI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-acpi-s4: Whether the system firmware supports S4 hibernation
+# (suspend to disk), as defined in the ACPI specification.
+# If the field is missing, its assumed value is 'false'.
+#
+# Since: 2.13
+#
+# Examples:
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/seabios/bios-256k.bin",
+# "description": "SeaBIOS",
+# "tags": [
+# "CONFIG_ROM_SIZE=256"
+# ]
+# },
+# "type": "bios",
+# "targets": [
+# "i386",
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "memory",
+# "write": "denied"
+# },
+# "supports-acpi-s3": true,
+# "supports-acpi-s4": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
+# "description": "OVMF with Secure Boot and SMM-protected
varstore",
+# "tags": [
+# "FD_SIZE_4MB",
+# "IA32X64",
+# "SECURE_BOOT_ENABLE",
+# "SMM_REQUIRE"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash",
+# "write": "restricted-to-secure-context"
+# },
+# "templates": [
+# {
+# "pathname": "/usr/share/OVMF/OVMF_VARS.fd",
+# "description": "empty varstore template"
+# },
+# {
+# "pathname":
"/usr/share/OVMF/OVMF_VARS.secboot.fd",
+# "description": "varstore template with the
Microsoft certificates enrolled for Secure Boot",
+# "tags": [
+# "mscerts"
+# ]
+# }
+# ]
+# }
+# ],
+# "supports-uefi-secure-boot": true,
+# "supports-amd-sev": true,
+# "supports-acpi-s3": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/AAVMF/AAVMF_CODE.fd",
+# "description": "ARM64 UEFI firmware",
+# "tags": [
+# "AARCH64"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "aarch64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash"
+# },
+# "templates": [
+# {
+# "pathname": "/usr/share/AAVMF/AAVMF_VARS.fd",
+# "description": "empty varstore template"
+# }
+# ]
+# }
+# ]
+# }
+#
+# {
+# "executable": {
+# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_CODE-pure-efi.fd",
+# "description": "32-bit OVMF with unprotected varstore and no
Secure Boot",
+# "tags": [
+# "FD_SIZE_2MB",
+# "IA32"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "i386",
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash"
+# },
+# "templates": [
+# {
+# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_VARS-pure-efi.fd",
+# "description": "empty varstore template"
+# }
+# ]
+# }
+# ],
+# "supports-acpi-s3": true
+# }
+##
+{ 'struct' : 'SystemFirmware',
+ 'data' : { 'executable' : 'FirmwareFile',
+ 'type' : 'SystemFirmwareType',
+ 'targets' : [ 'str' ],
+ 'sysfw-map' : 'FirmwareMapping',
+ '*nvram-slots' : [ 'NVRAMSlot' ],
+ '*supports-uefi-secure-boot' : 'bool',
+ '*supports-amd-sev' : 'bool',
+ '*supports-acpi-s3' : 'bool',
+ '*supports-acpi-s4' : 'bool' } }
+
+##
+# @x-check-firmware:
+#
+# Accept a @SystemFirmware object and do nothing, successfully. This command
+# can be used in the QMP shell to validate @SystemFirmware JSON against the
+# schema, and to pretty print it.
+#
+# @sysfw: ignored
+#
+# Since: 2.13
+##
+{ 'command' : 'x-check-firmware',
+ 'data' : { 'sysfw' : 'SystemFirmware' } }
Maybe it would be more useful to have a way to load a firmware image via
such a json file? E.g. run "qemu-system-x86_64 -bios seabios.json" or
something similar?
Or a QAPI command that can be used to load a firmware image this way?
(which would only work before the guest has been started of course)
Thomas
3:19 a.m.
> +{ 'enum' : 'SystemFirmwareType',
> + 'data' : [ 'bios', 'slof', 'uboot',
'uefi' ] }
The naming here is quite a bad mixture between firmware interface
('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
so I'd suggest to rather name them 'seabios' and 'edk2' here instead.
uboot for example implements uefi unterfaces too (dunno how complete,
but reportly recent versions can run uefi shell and grub just fine).
cheers,
Gerd
11:50 a.m.
On 04/09/18 10:19, Gerd Hoffmann wrote:
>> +{ 'enum' : 'SystemFirmwareType',
>> + 'data' : [ 'bios', 'slof', 'uboot',
'uefi' ] }
>
> The naming here is quite a bad mixture between firmware interface
> ('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
> could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
> so I'd suggest to rather name them 'seabios' and 'edk2' here
instead.
uboot for example implements uefi unterfaces too (dunno how complete,
but reportly recent versions can run uefi shell and grub just fine).
Indeed: when I was struggling with this enum type and tried to look for
more firmware types to add, my googling turned up the "UEFI on Top of
U-Boot" whitepaper, from Alex and Andreas :)
Again, this reaches to the root of the problem: when a user creates a
new domain, using high-level tools, they just want to tick "UEFI". (Dan
has emphasized this to me several times, so I think I get the idea by
now, if not the full environment.) We cannot ask the user, "please be
more specific, do you want UEFI from edk2, or UEFI on top of U-Boot?"
Instead, each of those firmware images will have to come with a JSON
document that states "uefi" in SystemFirmware.type, and the host admin
will be responsible for establishing a priority order between them.
Then, when the user asks for "UEFI" (and no more details), they'll get
(compatibly with the target architecture) whichever firmware the host
admin marked as "higher priority".
(Please be aware that with this argument, I'm trying to put myself into
Dan's shoes. It doesn't come *naturally* to me; in fact I'm viscerally
screaming inside at this amount of "fuzz". Personally I'd say, "I can
give you what you *say*, not what you *mean*, so *say* what you mean".
Apparently, that cannot work here, because what users mean is "UEFI" and
nothing more. I have to accept that.)
Thanks
Laszlo
1:18 a.m.
Hi,
> uboot for example implements uefi unterfaces too (dunno how
complete,
> but reportly recent versions can run uefi shell and grub just fine).
Indeed: when I was struggling with this enum type and tried to look for
more firmware types to add, my googling turned up the "UEFI on Top of
U-Boot" whitepaper, from Alex and Andreas :)
In case you wanna play: uboot supports x86 qemu meanwhile, so you can
try install u-boot.git-x86 from my firmware repo, then run
"qemu-system-x86_64 -bios /usr/share/u-boot.git/x86/qemu-pc/u-boot.rom".
It certainly isn't a useful edk2 replacement atm. It has no virtio
drivers. And even when using ide storage its not like it would happily
boot a fedora live iso. So I certainly wouldn't tag that as uefi today.
That might change at some point in the future though.
Again, this reaches to the root of the problem: when a user creates
a
new domain, using high-level tools, they just want to tick "UEFI". (Dan
has emphasized this to me several times, so I think I get the idea by
now, if not the full environment.) We cannot ask the user, "please be
more specific, do you want UEFI from edk2, or UEFI on top of U-Boot?"
Well, in case the uefi support in u-boot is good enough some day then it
doesn't matter to the user whenever uboot or edk2 boots the efi guest
from disk/iso, right?
cheers,
Gerd
4:09 a.m.
On 04/10/18 08:18, Gerd Hoffmann wrote:
Hi,
>> uboot for example implements uefi unterfaces too (dunno how complete,
>> but reportly recent versions can run uefi shell and grub just fine).
>
> Indeed: when I was struggling with this enum type and tried to look for
> more firmware types to add, my googling turned up the "UEFI on Top of
> U-Boot" whitepaper, from Alex and Andreas :)
In case you wanna play: uboot supports x86 qemu meanwhile, so you can
try install u-boot.git-x86 from my firmware repo, then run
"qemu-system-x86_64 -bios /usr/share/u-boot.git/x86/qemu-pc/u-boot.rom".
It certainly isn't a useful edk2 replacement atm. It has no virtio
drivers. And even when using ide storage its not like it would happily
boot a fedora live iso. So I certainly wouldn't tag that as uefi today.
That might change at some point in the future though.
> Again, this reaches to the root of the problem: when a user creates a
> new domain, using high-level tools, they just want to tick "UEFI". (Dan
> has emphasized this to me several times, so I think I get the idea by
> now, if not the full environment.) We cannot ask the user, "please be
> more specific, do you want UEFI from edk2, or UEFI on top of U-Boot?"
Well, in case the uefi support in u-boot is good enough some day then it
doesn't matter to the user whenever uboot or edk2 boots the efi guest
from disk/iso, right?
I believe that's correct.
Laszlo
2:33 a.m.
On 09.04.2018 18:50, Laszlo Ersek wrote:
On 04/09/18 10:19, Gerd Hoffmann wrote:
>>> +{ 'enum' : 'SystemFirmwareType',
>>> + 'data' : [ 'bios', 'slof', 'uboot',
'uefi' ] }
>>
>> The naming here is quite a bad mixture between firmware interface
>> ('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
>> could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
>> so I'd suggest to rather name them 'seabios' and 'edk2' here
instead.
>
> uboot for example implements uefi unterfaces too (dunno how complete,
> but reportly recent versions can run uefi shell and grub just fine).
Indeed: when I was struggling with this enum type and tried to look for
more firmware types to add, my googling turned up the "UEFI on Top of
U-Boot" whitepaper, from Alex and Andreas :)
Again, this reaches to the root of the problem: when a user creates a
new domain, using high-level tools, they just want to tick "UEFI". (Dan
has emphasized this to me several times, so I think I get the idea by
now, if not the full environment.) We cannot ask the user, "please be
more specific, do you want UEFI from edk2, or UEFI on top of U-Boot?"
But you are designing a rather low-level interface here, which should
IMHO rather be precise than fuzzy. So should this "just want to tick
UEFI" rather be handled in the high-level tools instead?
Alternatively, what about providing some kind of "alias" or
"nickname"
setting here, too? So the EDK2 builds would get
SystemFirmwareType="edk2" and "SystemFirmwareAlias="uefi" for
example.
Thomas
4:22 a.m.
On 04/10/18 09:33, Thomas Huth wrote:
On 09.04.2018 18:50, Laszlo Ersek wrote:
> On 04/09/18 10:19, Gerd Hoffmann wrote:
>>>> +{ 'enum' : 'SystemFirmwareType',
>>>> + 'data' : [ 'bios', 'slof', 'uboot',
'uefi' ] }
>>>
>>> The naming here is quite a bad mixture between firmware interface
>>> ('bios', 'uefi') and firmware implementations
('slof', 'uboot'). There
>>> could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
>>> so I'd suggest to rather name them 'seabios' and 'edk2'
here instead.
>>
>> uboot for example implements uefi unterfaces too (dunno how complete,
>> but reportly recent versions can run uefi shell and grub just fine).
>
> Indeed: when I was struggling with this enum type and tried to look for
> more firmware types to add, my googling turned up the "UEFI on Top of
> U-Boot" whitepaper, from Alex and Andreas :)
>
> Again, this reaches to the root of the problem: when a user creates a
> new domain, using high-level tools, they just want to tick "UEFI". (Dan
> has emphasized this to me several times, so I think I get the idea by
> now, if not the full environment.) We cannot ask the user, "please be
> more specific, do you want UEFI from edk2, or UEFI on top of U-Boot?"
But you are designing a rather low-level interface here, which should
IMHO rather be precise than fuzzy. So should this "just want to tick
UEFI" rather be handled in the high-level tools instead?
Alternatively, what about providing some kind of "alias" or
"nickname"
setting here, too? So the EDK2 builds would get
SystemFirmwareType="edk2" and "SystemFirmwareAlias="uefi" for
example.
I hope I understand you right -- I think your suggestion ties in with my
other email I just sent in this thread. So, we could tell libvirtd,
"this firmware is of type 'UEFI', and you must use the 'ovmf_smm'
mapping method to run it, with this file or that file as varstore template".
We could even describe the parameters for this or that mapping method
structurally in the schema (in a discriminated union in QAPI JSON, or in
an XSD choice element). For example, "ovmf" and "ovmf_smm" would both
take "OvmfSplitFileOptions" -- a list of single varstore template files
with feature enum contants attached --, while "SeaBiosOptions" would be
an empty structure.
I feel the key question here is whether we are allowed to directly
reference a mapping method we know libvirt implements. If we are, that
makes things a lot clearer (and easier, I should hope).
Thanks
Laszlo
4:32 a.m.
On 10.04.2018 11:22, Laszlo Ersek wrote:
On 04/10/18 09:33, Thomas Huth wrote:
[...]
> Alternatively, what about providing some kind of
"alias" or "nickname"
> setting here, too? So the EDK2 builds would get
> SystemFirmwareType="edk2" and "SystemFirmwareAlias="uefi"
for example.
I hope I understand you right -- I think your suggestion ties in with my
other email I just sent in this thread. So, we could tell libvirtd,
"this firmware is of type 'UEFI', and you must use the 'ovmf_smm'
mapping method to run it, with this file or that file as varstore template".
We could even describe the parameters for this or that mapping method
structurally in the schema (in a discriminated union in QAPI JSON, or in
an XSD choice element). For example, "ovmf" and "ovmf_smm" would
both
take "OvmfSplitFileOptions" -- a list of single varstore template files
with feature enum contants attached --, while "SeaBiosOptions" would be
an empty structure.
Sorry, I've got no clue about ovmf_smm and the other things you've
mentioned here ;-)
I feel the key question here is whether we are allowed to directly
reference a mapping method we know libvirt implements. If we are, that
makes things a lot clearer (and easier, I should hope).
Key question is maybe rather: Do you want to design / implement
something that is libvirt-only here, or rather something generic that
could also be used for other upper layer tools that do not use libvirt?
(... and looks like Daniel just had the same comment in another mail in
this thread ...)
Thomas
6:53 a.m.
On 04/10/18 11:32, Thomas Huth wrote:
On 10.04.2018 11:22, Laszlo Ersek wrote:
> On 04/10/18 09:33, Thomas Huth wrote:
[...]
>> Alternatively, what about providing some kind of "alias" or
"nickname"
>> setting here, too? So the EDK2 builds would get
>> SystemFirmwareType="edk2" and
"SystemFirmwareAlias="uefi" for example.
>
> I hope I understand you right -- I think your suggestion ties in with my
> other email I just sent in this thread. So, we could tell libvirtd,
> "this firmware is of type 'UEFI', and you must use the
'ovmf_smm'
> mapping method to run it, with this file or that file as varstore template".
>
> We could even describe the parameters for this or that mapping method
> structurally in the schema (in a discriminated union in QAPI JSON, or in
> an XSD choice element). For example, "ovmf" and "ovmf_smm" would
both
> take "OvmfSplitFileOptions" -- a list of single varstore template files
> with feature enum contants attached --, while "SeaBiosOptions" would be
> an empty structure.
Sorry, I've got no clue about ovmf_smm and the other things you've
mentioned here ;-)
> I feel the key question here is whether we are allowed to directly
> reference a mapping method we know libvirt implements. If we are, that
> makes things a lot clearer (and easier, I should hope).
Key question is maybe rather: Do you want to design / implement
something that is libvirt-only here, or rather something generic that
could also be used for other upper layer tools that do not use libvirt?
(... and looks like Daniel just had the same comment in another mail in
this thread ...)
Yeah, we can't target libvirtd as the sole consumer.
Laszlo
4:09 a.m.
On Mon, Apr 09, 2018 at 06:50:12PM +0200, Laszlo Ersek wrote:
On 04/09/18 10:19, Gerd Hoffmann wrote:
>>> +{ 'enum' : 'SystemFirmwareType',
>>> + 'data' : [ 'bios', 'slof', 'uboot',
'uefi' ] }
>>
>> The naming here is quite a bad mixture between firmware interface
>> ('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
>> could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
>> so I'd suggest to rather name them 'seabios' and 'edk2' here
instead.
>
> uboot for example implements uefi unterfaces too (dunno how complete,
> but reportly recent versions can run uefi shell and grub just fine).
Indeed: when I was struggling with this enum type and tried to look for
more firmware types to add, my googling turned up the "UEFI on Top of
U-Boot" whitepaper, from Alex and Andreas :)
Again, this reaches to the root of the problem: when a user creates a
new domain, using high-level tools, they just want to tick "UEFI". (Dan
has emphasized this to me several times, so I think I get the idea by
now, if not the full environment.) We cannot ask the user, "please be
more specific, do you want UEFI from edk2, or UEFI on top of U-Boot?"
Instead, each of those firmware images will have to come with a JSON
document that states "uefi" in SystemFirmware.type, and the host admin
will be responsible for establishing a priority order between them.
Then, when the user asks for "UEFI" (and no more details), they'll get
(compatibly with the target architecture) whichever firmware the host
admin marked as "higher priority".
Yep, I don't think there's any problem here. If they have asked for
"uefi", they'll get whichever UEFI implementation is the default for
that host. Today it'll be an EDK2 impl, but if there's a uboot impl
of UEFI available instead, that's fine too. If both are available
we'll have some deterministic manner in which we pick one, even if it
as simple as which has alphabetically first filename.
This is really only about getting good default choices. If the user
really badly wants to have a specific firmware, they can still provide
a path to it themselves instead of having libvirt choose it.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
11:34 a.m.
On 04/09/18 09:26, Thomas Huth wrote:
Hi Laszlo,
On 07.04.2018 02:01, Laszlo Ersek wrote:
> Add a schema that describes the properties of virtual machine firmware.
>
> Each firmware executable installed on a host system should come with a
> JSON file that conforms to this schema, and informs the management
> applications about the firmware's properties.
>
> In addition, a configuration directory with symlinks to the JSON files
> should exist, with the symlinks carefully named to reflect a priority
> order. Management applications can then search this directory in priority
> order for the first firmware executable that satisfies their search
> criteria. The found JSON file provides the management layer with domain
> configuration bits that are required to run the firmware binary.
[...]
> +##
> +# @FirmwareDevice:
> +#
> +# Defines the device types that a firmware file can be mapped into.
> +#
> +# @memory: The firmware file is to be mapped into memory.
> +#
> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
> +# similar to @memory but may imply additional processing that is
> +# specific to the target architecture.
> +#
> +# @flash: The firmware file is to be mapped into a pflash chip.
> +#
> +# Since: 2.13
> +##
> +{ 'enum' : 'FirmwareDevice',
> + 'data' : [ 'memory', 'kernel', 'flash' ] }
This is not fully clear to me... what is this exactly good for? Is this
a way to say how the firmware should be loaded, i.e. via "-bios",
"-kernel" or "-pflash" parameter? If so, the term "memory"
is quite
misleading since files that are loaded via -bios can also end up in an
emulated ROM chip.
I threw in "-kernel" because, although it also (usually?) means
"memory", I expected people would want it separate.
Regarding memory vs. pflash, I thought that these two, combined with the
access permissions, could cover all of RAM, ROM, and read-only and
read-write pflash too.
So, "-bios" (-> ROM) boils down to "memory", with write access
denied --
please see the SeaBIOS example near the end.
[...]
> +##
> +# @NVRAMSlot:
> +#
> +# Defines the mapping properties of an NVRAM slot, and associates compatible
> +# NVRAM templates with the NVRAM slot.
> +#
> +# @slot-id: The numeric identifier of the NVRAM slot. The interpretation of
> +# @slot-id is specific to the target architecture and the chosen
> +# system firmware.
> +#
> +# @nvram-map: the mapping requirements of this NVRAM slot
> +#
> +# @templates: A non-empty list of @FirmwareFile elements. Any @FirmwareFile
> +# identified by this list as an NVRAM template can be copied to
> +# create an actual NVRAM file, and the NVRAM file can be mapped
> +# into the NVRAM slot identified by @slot-id, subject to the
> +# mapping requirements in @nvram-map.
> +#
> +# Since: 2.13
> +##
> +{ 'struct' : 'NVRAMSlot',
> + 'data' : { 'slot-id' : 'uint64',
Not sure whether I've got the idea here right, so take this with a grain
of salt: Maybe 'uint64' is not flexible enough here. PAPR uses both, an
ID and a name (string), see chapter 8.3 in
https://members.openpowerfoundation.org/document/dl/469 ... but I guess
we could start with the 'slot-id' here and add a name field later if
necessary.
I only added "slot-id" as an initial place holder for telling apart the
individual NVRAMSlot elements in "SystemFirmware.nvram-slots". I
expected a scalar wouldn't be expressive enough for all arches, but, as
you say, it can be extended later.
> + 'nvram-map' : 'FirmwareMapping',
> + 'templates' : [ 'FirmwareFile' ] } }
> +
> +##
> +# @SystemFirmwareType:
> +#
> +# Lists system firmware types commonly used with QEMU virtual machines.
> +#
> +# @bios: The system firmware was built from the SeaBIOS project.
> +#
> +# @slof: The system firmware was built from the Slimline Open Firmware project.
> +#
> +# @uboot: The system firmware was built from the U-Boot project.
> +#
> +# @uefi: The system firmware was built from the edk2 (EFI Development Kit II)
> +# project.
> +#
> +# Since: 2.13
> +##
> +{ 'enum' : 'SystemFirmwareType',
> + 'data' : [ 'bios', 'slof', 'uboot', 'uefi'
] }
The naming here is quite a bad mixture between firmware interface
('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
so I'd suggest to rather name them 'seabios' and 'edk2' here instead.
Sure, I'm totally ready to follow community advice here (too).
In fact this is the one element I dislike the most about the schema --
it's the fuzziest part, yet it is the most important element for
libvirt. Because users and higher level apps just want to say "give me
UEFI". If I have to ask "OK, but UEFI built from edk2 or something
else?", then it's a lost cause already.
It's hard to find the right level of abstraction in the naming when the
higher level tools (and/or ultimately the users) don't know enough to
ask for specifics -- I'm not saying that's bad; it's quite natural, but
makes things very difficult. So this enum aims to match the user story
"gimme UEFI and be done with it". I figure users will just utter the
most common buzzword form of the concept they have in mind. "edk2"
doesn't tell them as much as "uefi".
QEMU also ships with a couple of OpenBIOS images, so you should
include
that in this list here, too.
Sure thing.
And since the SystemFirmwareType field in the SystemFirmware struct
below is not optional, you should also include an 'other' type here. Or
make the SystemFirmwareType in SystemFirmware optional. Otherwise it's
not possible to specify other firmware implementations with this scheme.
That's actually a feature, not a bug. Whenever a new firmware *type*
surfaces in our communities, such that libvirt should integrate it, it
has to become addressible by a simple "type" moniker. That's the entire
goal of this exercise -- the initial domain XML wants to say "gimme
FOOBAR", and FOOBAR it shall be, whatever it takes. Not "other". Nobody
will say 'give me a VM with "other" firmware'.
> +##
> +# @SystemFirmware:
> +#
> +# Describes a system firmware binary and any NVRAM slots that it requires.
> +#
> +# @executable: Identifies the platform firmware executable.
> +#
> +# @type: The type by which the system firmware is commonly known. This is the
> +# main search key by which management software looks up a system
> +# firmware image for a new domain.
> +#
> +# @targets: a non-empty list of target architectures that are capable of
> +# executing the system firmware
> +#
> +# @sysfw-map: the mapping requirements of the system firmware binary
> +#
> +# @nvram-slots: A list of NVRAM slots that are required by the system firmware.
> +# The @slot-id field must be unique across the list. Importantly,
> +# if any @FirmwareAccess is @restricted-to-secure-context in
> +# @sysfw-map or in any @nvram-map in @nvram-slots, then (a) the
> +# virtual machine configuration is required to emulate the secure
> +# code execution context (as defined for @targets), and (b) the
> +# virtual machine configuration is required to actually restrict
> +# the access in question to the secure execution context.
> +#
> +# @supports-uefi-secure-boot: Whether the system firmware implements the
> +# software interfaces for UEFI Secure Boot, as
> +# defined in the UEFI specification. If the field
> +# is missing, its assumed value is 'false'.
> +#
> +# @supports-amd-sev: Whether the system firmware supports running under AMD
> +# Secure Encrypted Virtualization, as specified in the AMD64
> +# Architecture Programmer's Manual. If the field is missing,
> +# its assumed value is 'false'.
> +#
> +# @supports-acpi-s3: Whether the system firmware supports S3 sleep (suspend to
> +# RAM), as defined in the ACPI specification. If the field
> +# is missing, its assumed value is 'false'.
> +#
> +# @supports-acpi-s4: Whether the system firmware supports S4 hibernation
> +# (suspend to disk), as defined in the ACPI specification.
> +# If the field is missing, its assumed value is 'false'.
> +#
> +# Since: 2.13
> +#
> +# Examples:
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/seabios/bios-256k.bin",
> +# "description": "SeaBIOS",
> +# "tags": [
> +# "CONFIG_ROM_SIZE=256"
> +# ]
> +# },
> +# "type": "bios",
> +# "targets": [
> +# "i386",
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "memory",
> +# "write": "denied"
> +# },
> +# "supports-acpi-s3": true,
> +# "supports-acpi-s4": true
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
> +# "description": "OVMF with Secure Boot and SMM-protected
varstore",
> +# "tags": [
> +# "FD_SIZE_4MB",
> +# "IA32X64",
> +# "SECURE_BOOT_ENABLE",
> +# "SMM_REQUIRE"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash",
> +# "write": "restricted-to-secure-context"
> +# },
> +# "templates": [
> +# {
> +# "pathname":
"/usr/share/OVMF/OVMF_VARS.fd",
> +# "description": "empty varstore template"
> +# },
> +# {
> +# "pathname":
"/usr/share/OVMF/OVMF_VARS.secboot.fd",
> +# "description": "varstore template with the
Microsoft certificates enrolled for Secure Boot",
> +# "tags": [
> +# "mscerts"
> +# ]
> +# }
> +# ]
> +# }
> +# ],
> +# "supports-uefi-secure-boot": true,
> +# "supports-amd-sev": true,
> +# "supports-acpi-s3": true
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/AAVMF/AAVMF_CODE.fd",
> +# "description": "ARM64 UEFI firmware",
> +# "tags": [
> +# "AARCH64"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "aarch64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash"
> +# },
> +# "templates": [
> +# {
> +# "pathname":
"/usr/share/AAVMF/AAVMF_VARS.fd",
> +# "description": "empty varstore template"
> +# }
> +# ]
> +# }
> +# ]
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_CODE-pure-efi.fd",
> +# "description": "32-bit OVMF with unprotected varstore and
no Secure Boot",
> +# "tags": [
> +# "FD_SIZE_2MB",
> +# "IA32"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "i386",
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash"
> +# },
> +# "templates": [
> +# {
> +# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_VARS-pure-efi.fd",
> +# "description": "empty varstore template"
> +# }
> +# ]
> +# }
> +# ],
> +# "supports-acpi-s3": true
> +# }
> +##
> +{ 'struct' : 'SystemFirmware',
> + 'data' : { 'executable' :
'FirmwareFile',
> + 'type' : 'SystemFirmwareType',
> + 'targets' : [ 'str' ],
> + 'sysfw-map' : 'FirmwareMapping',
> + '*nvram-slots' : [ 'NVRAMSlot' ],
> + '*supports-uefi-secure-boot' : 'bool',
> + '*supports-amd-sev' : 'bool',
> + '*supports-acpi-s3' : 'bool',
> + '*supports-acpi-s4' : 'bool' } }
> +
> +##
> +# @x-check-firmware:
> +#
> +# Accept a @SystemFirmware object and do nothing, successfully. This command
> +# can be used in the QMP shell to validate @SystemFirmware JSON against the
> +# schema, and to pretty print it.
> +#
> +# @sysfw: ignored
> +#
> +# Since: 2.13
> +##
> +{ 'command' : 'x-check-firmware',
> + 'data' : { 'sysfw' : 'SystemFirmware' } }
Maybe it would be more useful to have a way to load a firmware image via
such a json file? E.g. run "qemu-system-x86_64 -bios seabios.json" or
something similar?
I think that's very much out of scope... for me anyway :)
I believe (but I could be wrong) that the *only* reason I posted this
patch for QEMU is that QEMU is the one project with schema
administration / coordination. I don't really think QEMU actually has to
implement any features around this, it just has to manage the schema and
ensure well-formedness. I remain somewhat unconvinced QEMU is the best
place for this schema, but I couldn't suggest anything better.
Basically the producers of JSON documents that conform to this schema
are the firmware packages that get installed on host systems. The
consumer is libvirtd (to my understanding), and through libvirtd, higher
level applications. I don't fully know with what project that leaves us
for hosting the schema itself. I originally thought QEMU had nothing to
do with it, but that seemed counter to the consensus :)
Or a QAPI command that can be used to load a firmware image this
way?
(which would only work before the guest has been started of course)
Thanks!
Laszlo
12:59 a.m.
Hi,
I threw in "-kernel" because, although it also (usually?)
means
"memory", I expected people would want it separate.
Regarding memory vs. pflash, I thought that these two, combined with the
access permissions, could cover all of RAM, ROM, and read-only and
read-write pflash too.
So, "-bios" (-> ROM) boils down to "memory", with write access
denied --
please see the SeaBIOS example near the end.
Hmm, I'm wondering whenever it is useful to model things this way. It's
not like you can actually configure things for -bios seabios.rom or
-kernel uboot.elf. Only pflash allows to actually configure things, and
there are not that many useful combinations. The code needs
Read+Execute. Allowing Write could be useful in theory, to allow the
guest doing firmware updates. But I think nobody actually does that, so
in practice it is fixed. The varstore can have different permissions,
but it's only two useful combinations. Either allow access
unconditionally, or allow access in secure contect (aka smm) only.
cheers,
Gerd
4:07 a.m.
On 04/10/18 07:59, Gerd Hoffmann wrote:
Hi,
> I threw in "-kernel" because, although it also (usually?) means
> "memory", I expected people would want it separate.
>
> Regarding memory vs. pflash, I thought that these two, combined with the
> access permissions, could cover all of RAM, ROM, and read-only and
> read-write pflash too.
>
> So, "-bios" (-> ROM) boils down to "memory", with write access
denied --
> please see the SeaBIOS example near the end.
Hmm, I'm wondering whenever it is useful to model things this way. It's
not like you can actually configure things for -bios seabios.rom or
-kernel uboot.elf. Only pflash allows to actually configure things, and
there are not that many useful combinations. The code needs
Read+Execute. Allowing Write could be useful in theory, to allow the
guest doing firmware updates. But I think nobody actually does that, so
in practice it is fixed. The varstore can have different permissions,
but it's only two useful combinations. Either allow access
unconditionally, or allow access in secure contect (aka smm) only.
(I hope I understand your point right:)
I'm also fine if we simply define a fixed (but extensible) set of
mapping methods, basically a new enum type, that simply tells libvirtd
what this firmware *is*. IOW, directly reference a mapping method we
know libvirt implements, rather than give vague hints.
This could repurpose SystemFirmwareType, but it should become more
detailed. I'm thinking like:
- ovmf: split files without requiring SMM
- ovmf_smm: split files with SMM requirement
- seabios: exactly that
- ... other things others suggest.
So "ovmf" would refer precisely to point (3) in my email
<http://mid.mail-archive.com/3381bdf1-62ea-9da7-c654-032c0c11fb4e@redhat.c...;,
and "ovmf_smm" would refer to point (4) in that email.
Let me post the next version soon with this idea, focusing just on OVMF
and maybe SeaBIOS. Then let us see if that RFCv2 format lends itself
easily to extensions by Thomas. :)
Thanks!
Laszlo
4:51 a.m.
> Hmm, I'm wondering whenever it is useful to model things
this way. It's
> not like you can actually configure things for -bios seabios.rom or
> -kernel uboot.elf. Only pflash allows to actually configure things, and
> there are not that many useful combinations. The code needs
> Read+Execute. Allowing Write could be useful in theory, to allow the
> guest doing firmware updates. But I think nobody actually does that, so
> in practice it is fixed. The varstore can have different permissions,
> but it's only two useful combinations. Either allow access
> unconditionally, or allow access in secure contect (aka smm) only.
(I hope I understand your point right:)
I'm also fine if we simply define a fixed (but extensible) set of
mapping methods, basically a new enum type, that simply tells libvirtd
what this firmware *is*. IOW, directly reference a mapping method we
know libvirt implements, rather than give vague hints.
This could repurpose SystemFirmwareType, but it should become more
detailed. I'm thinking like:
- ovmf: split files without requiring SMM
- ovmf_smm: split files with SMM requirement
- seabios: exactly that
- ... other things others suggest.
I wouldn't name them by firmware, that is misleading. Basically we have
three cases:
(1) single firmware image (seabios, OVMF.fd, ...).
(2) split firmware image (OVMF_{CODE,VARS}.fd), where vars can be
writable unconditinally.
(3) split firmware image, where access to vars should be restricted
to smm mode.
(2) + (3) requires pflash. (1) works with both pflash and -bios.
There also is (4) elf binary loadable with -kernel. Not sure we should
include that case. u-boot can be loaded that way. The elf binary seems
to be more a side product of the build proccess, I always have both
u-boot (elf binary) and u-boot.bin (binary blob loadable with -bios).
So maybe we should put aside -kernel for now, and maybe reconsider once
a real need for it shows up.
So maybe Firmware{Device,Access,Mapping} should be replaced with a
FirmwareImageType [ 'single', 'code+vars', 'code+protectedvars' ]
?
cheers,
Gerd
4:55 a.m.
On Tue, Apr 10, 2018 at 11:51:31AM +0200, Gerd Hoffmann wrote:
> > Hmm, I'm wondering whenever it is useful to model
things this way. It's
> > not like you can actually configure things for -bios seabios.rom or
> > -kernel uboot.elf. Only pflash allows to actually configure things, and
> > there are not that many useful combinations. The code needs
> > Read+Execute. Allowing Write could be useful in theory, to allow the
> > guest doing firmware updates. But I think nobody actually does that, so
> > in practice it is fixed. The varstore can have different permissions,
> > but it's only two useful combinations. Either allow access
> > unconditionally, or allow access in secure contect (aka smm) only.
>
> (I hope I understand your point right:)
>
> I'm also fine if we simply define a fixed (but extensible) set of
> mapping methods, basically a new enum type, that simply tells libvirtd
> what this firmware *is*. IOW, directly reference a mapping method we
> know libvirt implements, rather than give vague hints.
>
> This could repurpose SystemFirmwareType, but it should become more
> detailed. I'm thinking like:
> - ovmf: split files without requiring SMM
> - ovmf_smm: split files with SMM requirement
> - seabios: exactly that
> - ... other things others suggest.
I wouldn't name them by firmware, that is misleading. Basically we have
three cases:
(1) single firmware image (seabios, OVMF.fd, ...).
(2) split firmware image (OVMF_{CODE,VARS}.fd), where vars can be
writable unconditinally.
(3) split firmware image, where access to vars should be restricted
to smm mode.
(2) + (3) requires pflash. (1) works with both pflash and -bios.
A big chunk of the data in the schema looks specific to the pflash
case, but this is not expressed except in the docs. Most of the time
with QAPI when we have data that is only relevant in certain types,
we use a discriminated union to describe it. It feels like a unioon
approach could be better suited to this
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
7:04 a.m.
On 04/10/18 11:55, Daniel P. Berrangé wrote:
On Tue, Apr 10, 2018 at 11:51:31AM +0200, Gerd Hoffmann wrote:
>>> Hmm, I'm wondering whenever it is useful to model things this way.
It's
>>> not like you can actually configure things for -bios seabios.rom or
>>> -kernel uboot.elf. Only pflash allows to actually configure things, and
>>> there are not that many useful combinations. The code needs
>>> Read+Execute. Allowing Write could be useful in theory, to allow the
>>> guest doing firmware updates. But I think nobody actually does that, so
>>> in practice it is fixed. The varstore can have different permissions,
>>> but it's only two useful combinations. Either allow access
>>> unconditionally, or allow access in secure contect (aka smm) only.
>>
>> (I hope I understand your point right:)
>>
>> I'm also fine if we simply define a fixed (but extensible) set of
>> mapping methods, basically a new enum type, that simply tells libvirtd
>> what this firmware *is*. IOW, directly reference a mapping method we
>> know libvirt implements, rather than give vague hints.
>>
>> This could repurpose SystemFirmwareType, but it should become more
>> detailed. I'm thinking like:
>> - ovmf: split files without requiring SMM
>> - ovmf_smm: split files with SMM requirement
>> - seabios: exactly that
>> - ... other things others suggest.
>
> I wouldn't name them by firmware, that is misleading. Basically we have
> three cases:
>
> (1) single firmware image (seabios, OVMF.fd, ...).
> (2) split firmware image (OVMF_{CODE,VARS}.fd), where vars can be
> writable unconditinally.
> (3) split firmware image, where access to vars should be restricted
> to smm mode.
>
> (2) + (3) requires pflash. (1) works with both pflash and -bios.
A big chunk of the data in the schema looks specific to the pflash
case, but this is not expressed except in the docs. Most of the time
with QAPI when we have data that is only relevant in certain types,
we use a discriminated union to describe it. It feels like a unioon
approach could be better suited to this
I used a discriminated union specifically for pflash options in RFCv0,
which I didn't post. I felt that it wasn't flexible enough. :)
Laszlo
2:44 a.m.
On 09.04.2018 18:34, Laszlo Ersek wrote:
On 04/09/18 09:26, Thomas Huth wrote:
> Hi Laszlo,
>
> On 07.04.2018 02:01, Laszlo Ersek wrote:
>> Add a schema that describes the properties of virtual machine firmware.
>>
>> Each firmware executable installed on a host system should come with a
>> JSON file that conforms to this schema, and informs the management
>> applications about the firmware's properties.
>>
>> In addition, a configuration directory with symlinks to the JSON files
>> should exist, with the symlinks carefully named to reflect a priority
>> order. Management applications can then search this directory in priority
>> order for the first firmware executable that satisfies their search
>> criteria. The found JSON file provides the management layer with domain
>> configuration bits that are required to run the firmware binary.
> [...]
>> +##
>> +# @FirmwareDevice:
>> +#
>> +# Defines the device types that a firmware file can be mapped into.
>> +#
>> +# @memory: The firmware file is to be mapped into memory.
>> +#
>> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
>> +# similar to @memory but may imply additional processing that is
>> +# specific to the target architecture.
>> +#
>> +# @flash: The firmware file is to be mapped into a pflash chip.
>> +#
>> +# Since: 2.13
>> +##
>> +{ 'enum' : 'FirmwareDevice',
>> + 'data' : [ 'memory', 'kernel', 'flash' ] }
>
> This is not fully clear to me... what is this exactly good for? Is this
> a way to say how the firmware should be loaded, i.e. via "-bios",
> "-kernel" or "-pflash" parameter? If so, the term
"memory" is quite
> misleading since files that are loaded via -bios can also end up in an
> emulated ROM chip.
I threw in "-kernel" because, although it also (usually?) means
"memory", I expected people would want it separate.
Regarding memory vs. pflash, I thought that these two, combined with the
access permissions, could cover all of RAM, ROM, and read-only and
read-write pflash too.
So, "-bios" (-> ROM) boils down to "memory", with write access
denied --
please see the SeaBIOS example near the end.
Let me ask the other way round: How does a high-level tool know whether
it should use "-bios", "-kernel", "-pflash", "-device
generic-loader" or
"-younameit" for loading the firmware?
>> + 'nvram-map' :
'FirmwareMapping',
>> + 'templates' : [ 'FirmwareFile' ] } }
>> +
>> +##
>> +# @SystemFirmwareType:
>> +#
>> +# Lists system firmware types commonly used with QEMU virtual machines.
>> +#
>> +# @bios: The system firmware was built from the SeaBIOS project.
>> +#
>> +# @slof: The system firmware was built from the Slimline Open Firmware project.
>> +#
>> +# @uboot: The system firmware was built from the U-Boot project.
>> +#
>> +# @uefi: The system firmware was built from the edk2 (EFI Development Kit II)
>> +# project.
>> +#
>> +# Since: 2.13
>> +##
>> +{ 'enum' : 'SystemFirmwareType',
>> + 'data' : [ 'bios', 'slof', 'uboot',
'uefi' ] }
>
> The naming here is quite a bad mixture between firmware interface
> ('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
> could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
> so I'd suggest to rather name them 'seabios' and 'edk2' here
instead.
Sure, I'm totally ready to follow community advice here (too).
In fact this is the one element I dislike the most about the schema --
it's the fuzziest part, yet it is the most important element for
libvirt. Because users and higher level apps just want to say "give me
UEFI". If I have to ask "OK, but UEFI built from edk2 or something
else?", then it's a lost cause already.
It's hard to find the right level of abstraction in the naming when the
higher level tools (and/or ultimately the users) don't know enough to
ask for specifics -- I'm not saying that's bad; it's quite natural, but
makes things very difficult. So this enum aims to match the user story
"gimme UEFI and be done with it". I figure users will just utter the
most common buzzword form of the concept they have in mind. "edk2"
doesn't tell them as much as "uefi".
OK, I see your point. But I still think we should not design fuzzy
interfaces here at this low level, this will only lead to other trouble
later. ... thinking about this again, users seem to mix up firmware
interfaces / families with concrete implementations. So maybe we need
something like:
{ 'enum' : 'SystemFirmwareType',
'data' : [ 'seabios', 'slof', 'uboot', 'edk2',
'openbios' ] }
*and* :
{ 'enum' : 'SystemFirmwareInterface', /* or:
'SystemFirmwareFamily' */
'data' : [ 'bios', 'uefi', 'openfirmware' ] }
Then a high level tool can check both and pick the best match?
Thomas
3:57 a.m.
On 04/10/18 09:44, Thomas Huth wrote:
On 09.04.2018 18:34, Laszlo Ersek wrote:
> On 04/09/18 09:26, Thomas Huth wrote:
>> Hi Laszlo,
>>
>> On 07.04.2018 02:01, Laszlo Ersek wrote:
>>> Add a schema that describes the properties of virtual machine firmware.
>>>
>>> Each firmware executable installed on a host system should come with a
>>> JSON file that conforms to this schema, and informs the management
>>> applications about the firmware's properties.
>>>
>>> In addition, a configuration directory with symlinks to the JSON files
>>> should exist, with the symlinks carefully named to reflect a priority
>>> order. Management applications can then search this directory in priority
>>> order for the first firmware executable that satisfies their search
>>> criteria. The found JSON file provides the management layer with domain
>>> configuration bits that are required to run the firmware binary.
>> [...]
>>> +##
>>> +# @FirmwareDevice:
>>> +#
>>> +# Defines the device types that a firmware file can be mapped into.
>>> +#
>>> +# @memory: The firmware file is to be mapped into memory.
>>> +#
>>> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
>>> +# similar to @memory but may imply additional processing that is
>>> +# specific to the target architecture.
>>> +#
>>> +# @flash: The firmware file is to be mapped into a pflash chip.
>>> +#
>>> +# Since: 2.13
>>> +##
>>> +{ 'enum' : 'FirmwareDevice',
>>> + 'data' : [ 'memory', 'kernel', 'flash' ]
}
>>
>> This is not fully clear to me... what is this exactly good for? Is this
>> a way to say how the firmware should be loaded, i.e. via "-bios",
>> "-kernel" or "-pflash" parameter? If so, the term
"memory" is quite
>> misleading since files that are loaded via -bios can also end up in an
>> emulated ROM chip.
>
> I threw in "-kernel" because, although it also (usually?) means
> "memory", I expected people would want it separate.
>
> Regarding memory vs. pflash, I thought that these two, combined with the
> access permissions, could cover all of RAM, ROM, and read-only and
> read-write pflash too.
>
> So, "-bios" (-> ROM) boils down to "memory", with write access
denied --
> please see the SeaBIOS example near the end.
Let me ask the other way round: How does a high-level tool know whether
it should use "-bios", "-kernel", "-pflash", "-device
generic-loader" or
"-younameit" for loading the firmware?
I expect it knows that because its developers investigate all the
supported firmware options and write dedicated code for those. My
understanding is that this JSON is not supposed to inform the mgmt layer
about unknown firmware, but to expose enough information for the mgmt
layer to pick a firmware and to compose a known & supported cmdline
config for it.
>>> + 'nvram-map' :
'FirmwareMapping',
>>> + 'templates' : [ 'FirmwareFile' ] } }
>>> +
>>> +##
>>> +# @SystemFirmwareType:
>>> +#
>>> +# Lists system firmware types commonly used with QEMU virtual machines.
>>> +#
>>> +# @bios: The system firmware was built from the SeaBIOS project.
>>> +#
>>> +# @slof: The system firmware was built from the Slimline Open Firmware
project.
>>> +#
>>> +# @uboot: The system firmware was built from the U-Boot project.
>>> +#
>>> +# @uefi: The system firmware was built from the edk2 (EFI Development Kit
II)
>>> +# project.
>>> +#
>>> +# Since: 2.13
>>> +##
>>> +{ 'enum' : 'SystemFirmwareType',
>>> + 'data' : [ 'bios', 'slof', 'uboot',
'uefi' ] }
>>
>> The naming here is quite a bad mixture between firmware interface
>> ('bios', 'uefi') and firmware implementations ('slof',
'uboot'). There
>> could be other implementations of BIOS or UEFI than SeaBIOS and EDK2 ...
>> so I'd suggest to rather name them 'seabios' and 'edk2' here
instead.
>
> Sure, I'm totally ready to follow community advice here (too).
>
> In fact this is the one element I dislike the most about the schema --
> it's the fuzziest part, yet it is the most important element for
> libvirt. Because users and higher level apps just want to say "give me
> UEFI". If I have to ask "OK, but UEFI built from edk2 or something
> else?", then it's a lost cause already.
>
> It's hard to find the right level of abstraction in the naming when the
> higher level tools (and/or ultimately the users) don't know enough to
> ask for specifics -- I'm not saying that's bad; it's quite natural, but
> makes things very difficult. So this enum aims to match the user story
> "gimme UEFI and be done with it". I figure users will just utter the
> most common buzzword form of the concept they have in mind. "edk2"
> doesn't tell them as much as "uefi".
OK, I see your point. But I still think we should not design fuzzy
interfaces here at this low level, this will only lead to other trouble
later. ... thinking about this again, users seem to mix up firmware
interfaces / families with concrete implementations. So maybe we need
something like:
{ 'enum' : 'SystemFirmwareType',
'data' : [ 'seabios', 'slof', 'uboot', 'edk2',
'openbios' ] }
*and* :
{ 'enum' : 'SystemFirmwareInterface', /* or:
'SystemFirmwareFamily' */
'data' : [ 'bios', 'uefi', 'openfirmware' ] }
Then a high level tool can check both and pick the best match?
I'm fine even if we stick with SystemFirmwareInterface (or Family) only
(i.e., the most abstract concept that users will probably know about /
look for). SystemFirmwareType can be expressed in "tags" or not at all.
Thanks!
Laszlo
4:05 a.m.
On Mon, Apr 09, 2018 at 06:34:41PM +0200, Laszlo Ersek wrote:
On 04/09/18 09:26, Thomas Huth wrote:
> Hi Laszlo,
>
> On 07.04.2018 02:01, Laszlo Ersek wrote:
>> Add a schema that describes the properties of virtual machine firmware.
>>
>> Each firmware executable installed on a host system should come with a
>> JSON file that conforms to this schema, and informs the management
>> applications about the firmware's properties.
>>
>> In addition, a configuration directory with symlinks to the JSON files
>> should exist, with the symlinks carefully named to reflect a priority
>> order. Management applications can then search this directory in priority
>> order for the first firmware executable that satisfies their search
>> criteria. The found JSON file provides the management layer with domain
>> configuration bits that are required to run the firmware binary.
> [...]
>> +##
>> +# @FirmwareDevice:
>> +#
>> +# Defines the device types that a firmware file can be mapped into.
>> +#
>> +# @memory: The firmware file is to be mapped into memory.
>> +#
>> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
>> +# similar to @memory but may imply additional processing that is
>> +# specific to the target architecture.
>> +#
>> +# @flash: The firmware file is to be mapped into a pflash chip.
>> +#
>> +# Since: 2.13
>> +##
>> +{ 'enum' : 'FirmwareDevice',
>> + 'data' : [ 'memory', 'kernel', 'flash' ] }
>
> This is not fully clear to me... what is this exactly good for? Is this
> a way to say how the firmware should be loaded, i.e. via "-bios",
> "-kernel" or "-pflash" parameter? If so, the term
"memory" is quite
> misleading since files that are loaded via -bios can also end up in an
> emulated ROM chip.
I threw in "-kernel" because, although it also (usually?) means
"memory", I expected people would want it separate.
What platform / scenario actually uses -kernel to load firmware. If you
have loaded firmware using -kernel, how do you then load the actual
kernel ?
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
4:19 a.m.
On 10.04.2018 11:05, Daniel P. Berrangé wrote:
On Mon, Apr 09, 2018 at 06:34:41PM +0200, Laszlo Ersek wrote:
> On 04/09/18 09:26, Thomas Huth wrote:
>> Hi Laszlo,
>>
>> On 07.04.2018 02:01, Laszlo Ersek wrote:
>>> Add a schema that describes the properties of virtual machine firmware.
>>>
>>> Each firmware executable installed on a host system should come with a
>>> JSON file that conforms to this schema, and informs the management
>>> applications about the firmware's properties.
>>>
>>> In addition, a configuration directory with symlinks to the JSON files
>>> should exist, with the symlinks carefully named to reflect a priority
>>> order. Management applications can then search this directory in priority
>>> order for the first firmware executable that satisfies their search
>>> criteria. The found JSON file provides the management layer with domain
>>> configuration bits that are required to run the firmware binary.
>> [...]
>>> +##
>>> +# @FirmwareDevice:
>>> +#
>>> +# Defines the device types that a firmware file can be mapped into.
>>> +#
>>> +# @memory: The firmware file is to be mapped into memory.
>>> +#
>>> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
>>> +# similar to @memory but may imply additional processing that is
>>> +# specific to the target architecture.
>>> +#
>>> +# @flash: The firmware file is to be mapped into a pflash chip.
>>> +#
>>> +# Since: 2.13
>>> +##
>>> +{ 'enum' : 'FirmwareDevice',
>>> + 'data' : [ 'memory', 'kernel', 'flash' ]
}
>>
>> This is not fully clear to me... what is this exactly good for? Is this
>> a way to say how the firmware should be loaded, i.e. via "-bios",
>> "-kernel" or "-pflash" parameter? If so, the term
"memory" is quite
>> misleading since files that are loaded via -bios can also end up in an
>> emulated ROM chip.
>
> I threw in "-kernel" because, although it also (usually?) means
> "memory", I expected people would want it separate.
What platform / scenario actually uses -kernel to load firmware.
I think uboot uses -kernel in certain cases, see e.g.:
https://balau82.wordpress.com/2010/03/10/u-boot-for-arm-on-qemu/
If you
have loaded firmware using -kernel, how do you then load the actual
kernel ?
The kernel is then loaded from disk or network or another boot device.
Thomas
6:40 a.m.
On 04/10/18 11:05, Daniel P. Berrangé wrote:
On Mon, Apr 09, 2018 at 06:34:41PM +0200, Laszlo Ersek wrote:
> On 04/09/18 09:26, Thomas Huth wrote:
>> Hi Laszlo,
>>
>> On 07.04.2018 02:01, Laszlo Ersek wrote:
>>> Add a schema that describes the properties of virtual machine
>>> firmware.
>>>
>>> Each firmware executable installed on a host system should come
>>> with a JSON file that conforms to this schema, and informs the
>>> management applications about the firmware's properties.
>>>
>>> In addition, a configuration directory with symlinks to the JSON
>>> files should exist, with the symlinks carefully named to reflect a
>>> priority order. Management applications can then search this
>>> directory in priority order for the first firmware executable that
>>> satisfies their search criteria. The found JSON file provides the
>>> management layer with domain configuration bits that are required
>>> to run the firmware binary.
>> [...]
>>> +##
>>> +# @FirmwareDevice:
>>> +#
>>> +# Defines the device types that a firmware file can be mapped into.
>>> +#
>>> +# @memory: The firmware file is to be mapped into memory.
>>> +#
>>> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
>>> +# similar to @memory but may imply additional processing that is
>>> +# specific to the target architecture.
>>> +#
>>> +# @flash: The firmware file is to be mapped into a pflash chip.
>>> +#
>>> +# Since: 2.13
>>> +##
>>> +{ 'enum' : 'FirmwareDevice',
>>> + 'data' : [ 'memory', 'kernel', 'flash' ]
}
>>
>> This is not fully clear to me... what is this exactly good for? Is
>> this a way to say how the firmware should be loaded, i.e. via
>> "-bios", "-kernel" or "-pflash" parameter? If so,
the term "memory"
>> is quite misleading since files that are loaded via -bios can also
>> end up in an emulated ROM chip.
>
> I threw in "-kernel" because, although it also (usually?) means
> "memory", I expected people would want it separate.
What platform / scenario actually uses -kernel to load firmware. If
you have loaded firmware using -kernel, how do you then load the
actual kernel ?
AAVMF has a build called "ArmVirtQemuKernel" where the firmware is
loaded with the -kernel switch.
commit 8de84d4242215252af9d2afecd45e2419689ee5f
Author: Ard Biesheuvel <ard.biesheuvel(a)linaro.org>
Date: Fri Feb 5 14:57:57 2016 +0100
ArmVirtPkg: implement ArmVirtQemuKernel
This implements a version of ArmVirtQemu that does not execute in place from
emulated NOR flash, but implements the Linux kernel boot protocol, and executes
from DRAM instead. This allows UEFI to be loaded as a payload by a previous
bootloader stage such as ARM Trusted Firmware/OP-TEE.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel(a)linaro.org>
Acked-by: Laszlo Ersek <lersek(a)redhat.com>
My understanding is that in this scenario you cannot use -kernel for
loading a Linux kernel; instead you have to boot the Linux OS off of
some other media (CD-ROM, disk, network...) Personally I never use this
AAVMF build, but I know it exists and Ard uses it at least occasionally.
Thanks,
Laszlo
3:08 a.m.
On 07.04.2018 02:01, Laszlo Ersek wrote:
Add a schema that describes the properties of virtual machine
firmware.
[...]
+##
+# @SystemFirmware:
+#
+# Describes a system firmware binary and any NVRAM slots that it requires.
+#
+# @executable: Identifies the platform firmware executable.
+#
+# @type: The type by which the system firmware is commonly known. This is the
+# main search key by which management software looks up a system
+# firmware image for a new domain.
+#
+# @targets: a non-empty list of target architectures that are capable of
+# executing the system firmware
+#
+# @sysfw-map: the mapping requirements of the system firmware binary
+#
+# @nvram-slots: A list of NVRAM slots that are required by the system firmware.
+# The @slot-id field must be unique across the list. Importantly,
+# if any @FirmwareAccess is @restricted-to-secure-context in
+# @sysfw-map or in any @nvram-map in @nvram-slots, then (a) the
+# virtual machine configuration is required to emulate the secure
+# code execution context (as defined for @targets), and (b) the
+# virtual machine configuration is required to actually restrict
+# the access in question to the secure execution context.
+#
+# @supports-uefi-secure-boot: Whether the system firmware implements the
+# software interfaces for UEFI Secure Boot, as
+# defined in the UEFI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-amd-sev: Whether the system firmware supports running under AMD
+# Secure Encrypted Virtualization, as specified in the AMD64
+# Architecture Programmer's Manual. If the field is missing,
+# its assumed value is 'false'.
+#
+# @supports-acpi-s3: Whether the system firmware supports S3 sleep (suspend to
+# RAM), as defined in the ACPI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-acpi-s4: Whether the system firmware supports S4 hibernation
+# (suspend to disk), as defined in the ACPI specification.
+# If the field is missing, its assumed value is 'false'.
+#
+# Since: 2.13
+#
+# Examples:
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/seabios/bios-256k.bin",
+# "description": "SeaBIOS",
+# "tags": [
+# "CONFIG_ROM_SIZE=256"
+# ]
+# },
+# "type": "bios",
+# "targets": [
+# "i386",
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "memory",
+# "write": "denied"
+# },
+# "supports-acpi-s3": true,
+# "supports-acpi-s4": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
+# "description": "OVMF with Secure Boot and SMM-protected
varstore",
+# "tags": [
+# "FD_SIZE_4MB",
+# "IA32X64",
+# "SECURE_BOOT_ENABLE",
+# "SMM_REQUIRE"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash",
+# "write": "restricted-to-secure-context"
+# },
+# "templates": [
+# {
+# "pathname": "/usr/share/OVMF/OVMF_VARS.fd",
+# "description": "empty varstore template"
+# },
+# {
+# "pathname":
"/usr/share/OVMF/OVMF_VARS.secboot.fd",
+# "description": "varstore template with the
Microsoft certificates enrolled for Secure Boot",
+# "tags": [
+# "mscerts"
+# ]
+# }
+# ]
+# }
+# ],
+# "supports-uefi-secure-boot": true,
+# "supports-amd-sev": true,
+# "supports-acpi-s3": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/AAVMF/AAVMF_CODE.fd",
+# "description": "ARM64 UEFI firmware",
+# "tags": [
+# "AARCH64"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "aarch64"
+# ],
Another thought: I think that "targets" field is not enough. You also
need to map firmware images to certain machines. For example, on
aarch64, the AAVMF firmware only works on the "virt" machine, but not on
"raspi2" (I guess). On ppc64, SLOF only works for "pseries", but not
for
the other machines like "mac99" or "g3beige". And on x86_64, EDK2
only
works for "q35" and "pc-i440fx", but not for "isapc".
Thomas
11:42 a.m.
On 04/09/18 10:08, Thomas Huth wrote:
On 07.04.2018 02:01, Laszlo Ersek wrote:
> Add a schema that describes the properties of virtual machine firmware.
[...]
> +##
> +# @SystemFirmware:
> +#
> +# Describes a system firmware binary and any NVRAM slots that it requires.
> +#
> +# @executable: Identifies the platform firmware executable.
> +#
> +# @type: The type by which the system firmware is commonly known. This is the
> +# main search key by which management software looks up a system
> +# firmware image for a new domain.
> +#
> +# @targets: a non-empty list of target architectures that are capable of
> +# executing the system firmware
> +#
> +# @sysfw-map: the mapping requirements of the system firmware binary
> +#
> +# @nvram-slots: A list of NVRAM slots that are required by the system firmware.
> +# The @slot-id field must be unique across the list. Importantly,
> +# if any @FirmwareAccess is @restricted-to-secure-context in
> +# @sysfw-map or in any @nvram-map in @nvram-slots, then (a) the
> +# virtual machine configuration is required to emulate the secure
> +# code execution context (as defined for @targets), and (b) the
> +# virtual machine configuration is required to actually restrict
> +# the access in question to the secure execution context.
> +#
> +# @supports-uefi-secure-boot: Whether the system firmware implements the
> +# software interfaces for UEFI Secure Boot, as
> +# defined in the UEFI specification. If the field
> +# is missing, its assumed value is 'false'.
> +#
> +# @supports-amd-sev: Whether the system firmware supports running under AMD
> +# Secure Encrypted Virtualization, as specified in the AMD64
> +# Architecture Programmer's Manual. If the field is missing,
> +# its assumed value is 'false'.
> +#
> +# @supports-acpi-s3: Whether the system firmware supports S3 sleep (suspend to
> +# RAM), as defined in the ACPI specification. If the field
> +# is missing, its assumed value is 'false'.
> +#
> +# @supports-acpi-s4: Whether the system firmware supports S4 hibernation
> +# (suspend to disk), as defined in the ACPI specification.
> +# If the field is missing, its assumed value is 'false'.
> +#
> +# Since: 2.13
> +#
> +# Examples:
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/seabios/bios-256k.bin",
> +# "description": "SeaBIOS",
> +# "tags": [
> +# "CONFIG_ROM_SIZE=256"
> +# ]
> +# },
> +# "type": "bios",
> +# "targets": [
> +# "i386",
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "memory",
> +# "write": "denied"
> +# },
> +# "supports-acpi-s3": true,
> +# "supports-acpi-s4": true
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
> +# "description": "OVMF with Secure Boot and SMM-protected
varstore",
> +# "tags": [
> +# "FD_SIZE_4MB",
> +# "IA32X64",
> +# "SECURE_BOOT_ENABLE",
> +# "SMM_REQUIRE"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash",
> +# "write": "restricted-to-secure-context"
> +# },
> +# "templates": [
> +# {
> +# "pathname":
"/usr/share/OVMF/OVMF_VARS.fd",
> +# "description": "empty varstore template"
> +# },
> +# {
> +# "pathname":
"/usr/share/OVMF/OVMF_VARS.secboot.fd",
> +# "description": "varstore template with the
Microsoft certificates enrolled for Secure Boot",
> +# "tags": [
> +# "mscerts"
> +# ]
> +# }
> +# ]
> +# }
> +# ],
> +# "supports-uefi-secure-boot": true,
> +# "supports-amd-sev": true,
> +# "supports-acpi-s3": true
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/AAVMF/AAVMF_CODE.fd",
> +# "description": "ARM64 UEFI firmware",
> +# "tags": [
> +# "AARCH64"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "aarch64"
> +# ],
Another thought: I think that "targets" field is not enough. You also
need to map firmware images to certain machines.
I expected this :)
For example, on
aarch64, the AAVMF firmware only works on the "virt" machine, but not on
"raspi2" (I guess). On ppc64, SLOF only works for "pseries", but not
for
the other machines like "mac99" or "g3beige". And on x86_64, EDK2
only
works for "q35" and "pc-i440fx", but not for "isapc".
What's more, the SMM driver stack of edk2, when it's built into OVMF
(x86), doesn't work on i440fx at all; it requires Q35, and even from
that, a 2.4+ version (if memory serves).
Here's my problem with machine types in this schema (because, believe it
or not, I added such element(s) at first, but then gave up and killed them):
- if you add a *whitelist* of compatible machine types, then every time
you install a new QEMU version on the host (with a new, most-recent,
machine type), that machine type will not be on the whitelist (because,
remember, the JSON document comes with the firmware package). So, you'll
have to keep extending the JSON installed with the firmware image. Bad.
- if you add a *blacklist* of incompatible machine types, then the same
issue arises -- a new i440fx machine type, or even a completely new
machine type family, have to be blacklisted when they come out. They
should not be assumed SMM-compatible, for example, until proved so.
- I considered adding wildcards (say, blacklist "all" i440fx machtypes,
present and future, for SMM-requiring OVMF builds), but then you get
into version sorting and similar mess. I considered fnmatch() --
basically simple ? and * wildcards -- but that's not expressive enough.
So, my thinking was, all these "smarts" belong in actual libvirtd code
(C code), and the schema should only allow libvirtd to *recognize* what
is what.
Thanks,
Laszlo
1:27 a.m.
Hi,
- I considered adding wildcards (say, blacklist "all"
i440fx machtypes,
present and future, for SMM-requiring OVMF builds), but then you get
into version sorting and similar mess. I considered fnmatch() --
basically simple ? and * wildcards -- but that's not expressive enough.
I'd suggest whitelist with wildcards. So the smm builds would get
"pc-q35-*".
libvirt knows about aliases, so it should be able to handle the "q35"
shortcut like "pc-q35-${latest}".
Or do you see another issue?
cheers,
Gerd
4:16 a.m.
On 04/10/18 08:27, Gerd Hoffmann wrote:
Hi,
> - I considered adding wildcards (say, blacklist "all" i440fx machtypes,
> present and future, for SMM-requiring OVMF builds), but then you get
> into version sorting and similar mess. I considered fnmatch() --
> basically simple ? and * wildcards -- but that's not expressive enough.
I'd suggest whitelist with wildcards. So the smm builds would get
"pc-q35-*".
libvirt knows about aliases, so it should be able to handle the "q35"
shortcut like "pc-q35-${latest}".
Or do you see another issue?
Well, one issue I see is version sorting; I should say "Q35 but no
earlier than 2.4", and lexicographically, "2.11" sorts before
"2.4".
Anyway (also asking for Thomas's input here): if we run with your idea
to refer to exact mapping methods / firmware *implementation* types that
we know libvirt implements / supports as a "white box", do we still deem
machine type identification necessary? Because, libvirt already knows
(for example) that "ovmf_smm" requires pc-q35-2.4 or later. So we just
have to make a *reference* to that knowledge in the JSON file.
And, really, this seems to reinforce my point that the schema should
live in the libvirtd tree, not in the QEMU tree. In that case, perhaps
it would be a better fit to work with an XSD, and firmware packages
should install XML files? Personally I'm a lot more attracted to
XML/XSD; I think the tooling is better too. I just don't see how QEMU is
involved.
Opinions please :)
Thanks!
Laszlo
4:23 a.m.
On Tue, Apr 10, 2018 at 11:16:01AM +0200, Laszlo Ersek wrote:
On 04/10/18 08:27, Gerd Hoffmann wrote:
> Hi,
>
>> - I considered adding wildcards (say, blacklist "all" i440fx
machtypes,
>> present and future, for SMM-requiring OVMF builds), but then you get
>> into version sorting and similar mess. I considered fnmatch() --
>> basically simple ? and * wildcards -- but that's not expressive enough.
>
> I'd suggest whitelist with wildcards. So the smm builds would get
> "pc-q35-*".
>
> libvirt knows about aliases, so it should be able to handle the "q35"
> shortcut like "pc-q35-${latest}".
>
> Or do you see another issue?
Well, one issue I see is version sorting; I should say "Q35 but no
earlier than 2.4", and lexicographically, "2.11" sorts before
"2.4".
Anyway (also asking for Thomas's input here): if we run with your idea
to refer to exact mapping methods / firmware *implementation* types that
we know libvirt implements / supports as a "white box", do we still deem
machine type identification necessary? Because, libvirt already knows
(for example) that "ovmf_smm" requires pc-q35-2.4 or later. So we just
have to make a *reference* to that knowledge in the JSON file.
And, really, this seems to reinforce my point that the schema should
live in the libvirtd tree, not in the QEMU tree. In that case, perhaps
it would be a better fit to work with an XSD, and firmware packages
should install XML files? Personally I'm a lot more attracted to
XML/XSD; I think the tooling is better too. I just don't see how QEMU is
involved.
This is defining a set of metadata that is required to use various firmware
files in combination with QEMU, along with defining a mapping to QEMU command
line arguments and/or features. Essentially, while I wish everyone used
libvirt, libvirt is not the only thing that manages QEMU. This information is
relevant to anyone managing QEMU, so it doesn't belong in libvirt's realm,
it is clear QEMU is best placed to declare this information.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
5:09 a.m.
New subject: [libvirt] [Qemu-devel] [qemu RFC] qapi: add "firmware.json"
On 10/04/2018 11:23, Daniel P. Berrangé wrote:
> And, really, this seems to reinforce my point that the schema
should
> live in the libvirtd tree, not in the QEMU tree. In that case, perhaps
> it would be a better fit to work with an XSD, and firmware packages
> should install XML files? Personally I'm a lot more attracted to
> XML/XSD; I think the tooling is better too. I just don't see how QEMU is
> involved.
This is defining a set of metadata that is required to use various firmware
files in combination with QEMU, along with defining a mapping to QEMU command
line arguments and/or features. Essentially, while I wish everyone used
libvirt, libvirt is not the only thing that manages QEMU. This information is
relevant to anyone managing QEMU, so it doesn't belong in libvirt's realm,
it is clear QEMU is best placed to declare this information.
QEMU is best placed to _standardize_ how to provide this information
(and where in the file system to place it), but really it's up to
firmware packages to provide it.
We can of course define the schema in QAPI terms for ease of validation
(machine-readable specs are nice to have), but really this should just
be a file in docs/interop/. No code is needed in QEMU.
Paolo
6:46 a.m.
New subject: [libvirt] [Qemu-devel] [qemu RFC] qapi: add "firmware.json"
On 04/10/18 12:09, Paolo Bonzini wrote:
On 10/04/2018 11:23, Daniel P. Berrangé wrote:
>> And, really, this seems to reinforce my point that the schema should
>> live in the libvirtd tree, not in the QEMU tree. In that case, perhaps
>> it would be a better fit to work with an XSD, and firmware packages
>> should install XML files? Personally I'm a lot more attracted to
>> XML/XSD; I think the tooling is better too. I just don't see how QEMU is
>> involved.
>
> This is defining a set of metadata that is required to use various firmware
> files in combination with QEMU, along with defining a mapping to QEMU command
> line arguments and/or features. Essentially, while I wish everyone used
> libvirt, libvirt is not the only thing that manages QEMU. This information is
> relevant to anyone managing QEMU, so it doesn't belong in libvirt's realm,
> it is clear QEMU is best placed to declare this information.
QEMU is best placed to _standardize_ how to provide this information
(and where in the file system to place it), but really it's up to
firmware packages to provide it.
We can of course define the schema in QAPI terms for ease of validation
(machine-readable specs are nice to have), but really this should just
be a file in docs/interop/. No code is needed in QEMU.
OK -- while we're figuring out the schema, I guess I'll keep posting
RFCs that change source code / json, but finally we can move it to
docs/interop.
Thanks!
Laszlo
4:26 a.m.
On 10.04.2018 11:16, Laszlo Ersek wrote:
On 04/10/18 08:27, Gerd Hoffmann wrote:
> Hi,
>
>> - I considered adding wildcards (say, blacklist "all" i440fx
machtypes,
>> present and future, for SMM-requiring OVMF builds), but then you get
>> into version sorting and similar mess. I considered fnmatch() --
>> basically simple ? and * wildcards -- but that's not expressive enough.
>
> I'd suggest whitelist with wildcards. So the smm builds would get
> "pc-q35-*".
>
> libvirt knows about aliases, so it should be able to handle the "q35"
> shortcut like "pc-q35-${latest}".
>
> Or do you see another issue?
Well, one issue I see is version sorting; I should say "Q35 but no
earlier than 2.4", and lexicographically, "2.11" sorts before
"2.4".
Anyway (also asking for Thomas's input here): if we run with your idea
to refer to exact mapping methods / firmware *implementation* types that
we know libvirt implements / supports as a "white box", do we still deem
machine type identification necessary? Because, libvirt already knows
(for example) that "ovmf_smm" requires pc-q35-2.4 or later. So we just
have to make a *reference* to that knowledge in the JSON file.
I think you really need a way to specify the machine there. Latest
example from QEMU 2.12: We've now got two uboot binaries in the tree,
pc-bios/u-boot.e500 and pc-bios/u-boot-sam460-20100605.bin. Both are
uboot, both are for ppc, but u-boot.e500 only works with the "ppce500"
machine and the other one only works with the "sam460ex" machine. How
would you teach libvirt such a relationship without an explicit machine
type identification field there?
Thomas
6:53 a.m.
On 04/10/18 11:26, Thomas Huth wrote:
On 10.04.2018 11:16, Laszlo Ersek wrote:
> On 04/10/18 08:27, Gerd Hoffmann wrote:
>> Hi,
>>
>>> - I considered adding wildcards (say, blacklist "all" i440fx
machtypes,
>>> present and future, for SMM-requiring OVMF builds), but then you get
>>> into version sorting and similar mess. I considered fnmatch() --
>>> basically simple ? and * wildcards -- but that's not expressive enough.
>>
>> I'd suggest whitelist with wildcards. So the smm builds would get
>> "pc-q35-*".
>>
>> libvirt knows about aliases, so it should be able to handle the "q35"
>> shortcut like "pc-q35-${latest}".
>>
>> Or do you see another issue?
>
> Well, one issue I see is version sorting; I should say "Q35 but no
> earlier than 2.4", and lexicographically, "2.11" sorts before
"2.4".
>
> Anyway (also asking for Thomas's input here): if we run with your idea
> to refer to exact mapping methods / firmware *implementation* types that
> we know libvirt implements / supports as a "white box", do we still deem
> machine type identification necessary? Because, libvirt already knows
> (for example) that "ovmf_smm" requires pc-q35-2.4 or later. So we just
> have to make a *reference* to that knowledge in the JSON file.
I think you really need a way to specify the machine there. Latest
example from QEMU 2.12: We've now got two uboot binaries in the tree,
pc-bios/u-boot.e500 and pc-bios/u-boot-sam460-20100605.bin. Both are
uboot, both are for ppc, but u-boot.e500 only works with the "ppce500"
machine and the other one only works with the "sam460ex" machine. How
would you teach libvirt such a relationship without an explicit machine
type identification field there?
My idea was to assign different "map method" enumeration constants to
them, and libvirtd would associate those with different machtype
requirements.
But, as Daniel explained, we cannot reference libvirtd features, so I
agree we have to express machine types somehow. I don't know how though.
For example, can we take it for granted that a machtype version number,
if it exists in the first place, always follows the last hyphen in the
machtype identifier? Say, "virt-2.11" / aarch64 conforms,
"pc-q35-2.4"
and "pc-i440fx-2.12" conform too. But, is that a guarantee that covers
all arches and all boards?
Because, I don't think:
- machine-type-family = q35
- minimum-machine-type = 2.4
will work. Will every application that manages QEMU learn that "q35" is
short-hand for "pc-q35-XXX", and (again) that 2.12 sorts *after* 2.4?
Thanks,
Laszlo
4:34 a.m.
On Tue, Apr 10, 2018 at 11:16:01AM +0200, Laszlo Ersek wrote:
On 04/10/18 08:27, Gerd Hoffmann wrote:
> Hi,
>
>> - I considered adding wildcards (say, blacklist "all" i440fx
machtypes,
>> present and future, for SMM-requiring OVMF builds), but then you get
>> into version sorting and similar mess. I considered fnmatch() --
>> basically simple ? and * wildcards -- but that's not expressive enough.
>
> I'd suggest whitelist with wildcards. So the smm builds would get
> "pc-q35-*".
>
> libvirt knows about aliases, so it should be able to handle the "q35"
> shortcut like "pc-q35-${latest}".
>
> Or do you see another issue?
Well, one issue I see is version sorting; I should say "Q35 but no
earlier than 2.4", and lexicographically, "2.11" sorts before
"2.4".
Anyway (also asking for Thomas's input here): if we run with your idea
to refer to exact mapping methods / firmware *implementation* types that
we know libvirt implements / supports as a "white box", do we still deem
machine type identification necessary? Because, libvirt already knows
(for example) that "ovmf_smm" requires pc-q35-2.4 or later. So we just
have to make a *reference* to that knowledge in the JSON file.
BTW, that's not quite correct - when libvirt handles the "smm" arg it
checks if machine type == q35, and QEMU version >= 2.4.
It is *not* checking the version of the machine type. ie it will happily
use smm with pc-q35-2.0, as long as QEMU version is 2.4. Perhaps this is
not quite right, but we don't try to parse the version number out of the
machine type, because we can't assume a specific format for the machine
type version part. eg version can be "2.4", or it can be "rhel-7.0.0"
or something else again on Ubuntu.
IMHO it would be valid to just keep life simple and only record the base
machine type name that can use the firmware ie "pc", "q35", and
ignore
the fact that in some cases the firmware might require a specific version
of the machine type.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
6:57 a.m.
On 04/10/18 11:34, Daniel P. Berrangé wrote:
On Tue, Apr 10, 2018 at 11:16:01AM +0200, Laszlo Ersek wrote:
> On 04/10/18 08:27, Gerd Hoffmann wrote:
>> Hi,
>>
>>> - I considered adding wildcards (say, blacklist "all" i440fx
machtypes,
>>> present and future, for SMM-requiring OVMF builds), but then you get
>>> into version sorting and similar mess. I considered fnmatch() --
>>> basically simple ? and * wildcards -- but that's not expressive enough.
>>
>> I'd suggest whitelist with wildcards. So the smm builds would get
>> "pc-q35-*".
>>
>> libvirt knows about aliases, so it should be able to handle the "q35"
>> shortcut like "pc-q35-${latest}".
>>
>> Or do you see another issue?
>
> Well, one issue I see is version sorting; I should say "Q35 but no
> earlier than 2.4", and lexicographically, "2.11" sorts before
"2.4".
>
> Anyway (also asking for Thomas's input here): if we run with your idea
> to refer to exact mapping methods / firmware *implementation* types that
> we know libvirt implements / supports as a "white box", do we still deem
> machine type identification necessary? Because, libvirt already knows
> (for example) that "ovmf_smm" requires pc-q35-2.4 or later. So we just
> have to make a *reference* to that knowledge in the JSON file.
BTW, that's not quite correct - when libvirt handles the "smm" arg it
checks if machine type == q35, and QEMU version >= 2.4.
It is *not* checking the version of the machine type. ie it will happily
use smm with pc-q35-2.0, as long as QEMU version is 2.4. Perhaps this is
not quite right,
(it's not)
but we don't try to parse the version number out of the
machine type, because we can't assume a specific format for the machine
type version part. eg version can be "2.4", or it can be
"rhel-7.0.0"
or something else again on Ubuntu.
Indeed, that's exactly why I'm troubled about expressing a "minimum"
machine type version.
IMHO it would be valid to just keep life simple and only record the base
machine type name that can use the firmware ie "pc", "q35", and
ignore
the fact that in some cases the firmware might require a specific version
of the machine type.
Esp. with regard to SMM, there have been quite big jumps in usability /
stability across Q35 machtype versions. But, if it works for you, it
works for me.
(I double-checked Thomas's recent example about U-Boot, and he mentioned
the "ppce500" and "sam460ex" machine types, not machine type
versions.)
Thanks,
Laszlo
3:26 a.m.
+# {
+# "executable": {
+# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
+# "description": "OVMF with Secure Boot and SMM-protected
varstore",
+# "tags": [
+# "FD_SIZE_4MB",
+# "IA32X64",
+# "SECURE_BOOT_ENABLE",
+# "SMM_REQUIRE"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash",
+# "write": "restricted-to-secure-context"
+# },
What is "slot-id"? The pflash index? shouldn't we also specify the
index for the executable somewhere? Maybe the field should be moved
into FirmwareMapping?
cheers,
Gerd
11:53 a.m.
On 04/09/18 10:26, Gerd Hoffmann wrote:
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
> +# "description": "OVMF with Secure Boot and SMM-protected
varstore",
> +# "tags": [
> +# "FD_SIZE_4MB",
> +# "IA32X64",
> +# "SECURE_BOOT_ENABLE",
> +# "SMM_REQUIRE"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash",
> +# "write": "restricted-to-secure-context"
> +# },
What is "slot-id"? The pflash index?
Yes, it might be defined like that, for the i440fx and q35 machine
types. This correspondence would be implemented in libvirtd, I suppose.
However, I don't think such a correspondence is mandatory. At first
approach, slot-id is just the key that tells the nvramslots apart.
shouldn't we also specify the
index for the executable somewhere?
Maybe :)
Maybe the field should be moved
into FirmwareMapping?
I couldn't come up with a good use case where you wouldn't map the
*system* firmware in a predefined pflash unit (or other device unit). So
I thought that needed no slot-id.
Thanks
Laszlo
3:49 a.m.
On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:
Add a schema that describes the properties of virtual machine
firmware.
Each firmware executable installed on a host system should come with a
JSON file that conforms to this schema, and informs the management
applications about the firmware's properties.
In addition, a configuration directory with symlinks to the JSON files
should exist, with the symlinks carefully named to reflect a priority
order. Management applications can then search this directory in priority
order for the first firmware executable that satisfies their search
criteria. The found JSON file provides the management layer with domain
configuration bits that are required to run the firmware binary.
Cc: "Daniel P. Berrange" <berrange(a)redhat.com>
Cc: Alexander Graf <agraf(a)suse.de>
Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org>
Cc: David Gibson <dgibson(a)redhat.com>
Cc: Eric Blake <eblake(a)redhat.com>
Cc: Gary Ching-Pang Lin <glin(a)suse.com>
Cc: Gerd Hoffmann <kraxel(a)redhat.com>
Cc: Kashyap Chamarthy <kchamart(a)redhat.com>
Cc: Markus Armbruster <armbru(a)redhat.com>
Cc: Michael Roth <mdroth(a)linux.vnet.ibm.com>
Cc: Michal Privoznik <mprivozn(a)redhat.com>
Cc: Peter Krempa <pkrempa(a)redhat.com>
Cc: Peter Maydell <peter.maydell(a)linaro.org>
Cc: Thomas Huth <thuth(a)redhat.com>
Signed-off-by: Laszlo Ersek <lersek(a)redhat.com>
---
Notes:
Folks on the CC list, please try to see if the suggested schema is
flexible enough to describe the virtual firmware(s) that you are
familiar with. Thanks!
Makefile | 9 ++
Makefile.objs | 4 +
qapi/firmware.json | 343 ++++++++++++++++++++++++++++++++++++++++++++++++++
qapi/qapi-schema.json | 1 +
qmp.c | 5 +
.gitignore | 4 +
6 files changed, 366 insertions(+)
create mode 100644 qapi/firmware.json
diff --git a/qapi/firmware.json b/qapi/firmware.json
new file mode 100644
index 000000000000..f267240f44dd
--- /dev/null
+++ b/qapi/firmware.json
@@ -0,0 +1,343 @@
+# -*- Mode: Python -*-
+
+##
+# = Firmware
+##
+
+##
+# @FirmwareDevice:
+#
+# Defines the device types that a firmware file can be mapped into.
+#
+# @memory: The firmware file is to be mapped into memory.
+#
+# @kernel: The firmware file is to be loaded like a Linux kernel. This is
+# similar to @memory but may imply additional processing that is
+# specific to the target architecture.
+#
+# @flash: The firmware file is to be mapped into a pflash chip.
+#
+# Since: 2.13
+##
+{ 'enum' : 'FirmwareDevice',
+ 'data' : [ 'memory', 'kernel', 'flash' ] }
+
+##
+# @FirmwareAccess:
+#
+# Defines the possible permissions for a given access mode to a device that
+# maps a firmware file.
+#
+# @denied: The access is denied.
+#
+# @permitted: The access is permitted.
+#
+# @restricted-to-secure-context: The access is permitted for guest code that
+# runs in a secure context; otherwise the access
+# is denied. The definition of "secure
context"
+# is specific to the target architecture.
+#
+# Since: 2.13
+##
+{ 'enum' : 'FirmwareAccess',
+ 'data' : [ 'denied', 'permitted',
'restricted-to-secure-context' ] }
I'm not really understanding the purpose of this - what does it map to
on the command line ?
+
+##
+# @FirmwareMapping:
+#
+# Collects the mapping device type and the access permissions to that device
+# for system firmware and for NVRAM slots.
+#
+# @device: The system firmware or the NVRAM slot must reside in a device of
+# this type.
+#
+# @read: Permission for the guest to read the device that maps the firmware
+# file. If the field is missing, @permitted is assumed.
+#
+# @write: Permission for the guest to write the device that maps the firmware
+# file. If the field is missing, @permitted is assumed.
+#
+# @execute: Permission for the guest to execute code from the device that maps
+# the firmware file. If the field is missing, @permitted is assumed.
+#
+# Since: 2.13
+##
+{ 'struct' : 'FirmwareMapping',
+ 'data' : { 'device' : 'FirmwareDevice',
+ '*read' : 'FirmwareAccess',
+ '*write' : 'FirmwareAccess',
+ '*execute' : 'FirmwareAccess' } }
Again, what this this map to on the command line ?
+##
+# @FirmwareFile:
+#
+# Gathers the common traits of system firmware executables and NVRAM templates.
+#
+# @pathname: absolute pathname of the firmware file on the host filesystem
+#
+# @description: human-readable description of the firmware file
+#
+# @tags: a list of machine-readable strings providing additional information
This makes it look like this information is something applications should be
using when setting up firmwares, which is definitely not what we want. Lets
rename this
"@build_options: arbitrary list of firmware specific build options, for
informative purposes only. Applications should not attempt
to interpret / assign meaning to these options"
+# @format: If the @FirmwareDevice that this @FirmwareFile is mapped
into is
+# @flash, then @format describes the block format of the drive that
+# backs the device. Otherwise, this field should be 'raw' or absent.
+# If the field is missing, 'raw' is assumed.
Why does the format needed ?
If the firmware is to be loaded via a block device driver, then it should
not matter what format is used. If the mgmt app wants to take the firmware
file and convert it to qcow2 format that's fine - the code loading this
in QEMU will still see raw content.
+#
+# Since: 2.13
+##
+{ 'struct' : 'FirmwareFile',
+ 'data' : { 'pathname' : 'str',
+ '*description' : 'str',
+ '*tags' : [ 'str' ],
+ '*format' : 'str' } }
+
+##
+# @NVRAMSlot:
+#
+# Defines the mapping properties of an NVRAM slot, and associates compatible
+# NVRAM templates with the NVRAM slot.
+#
+# @slot-id: The numeric identifier of the NVRAM slot. The interpretation of
+# @slot-id is specific to the target architecture and the chosen
+# system firmware.
What does this correspond to at the CLI level ? Is this the -drive unit=NN
option when loading via a block device ?
+#
+# @nvram-map: the mapping requirements of this NVRAM slot
+#
+# @templates: A non-empty list of @FirmwareFile elements. Any @FirmwareFile
+# identified by this list as an NVRAM template can be copied to
+# create an actual NVRAM file, and the NVRAM file can be mapped
+# into the NVRAM slot identified by @slot-id, subject to the
+# mapping requirements in @nvram-map.
+#
+# Since: 2.13
+##
+{ 'struct' : 'NVRAMSlot',
+ 'data' : { 'slot-id' : 'uint64',
+ 'nvram-map' : 'FirmwareMapping',
+ 'templates' : [ 'FirmwareFile' ] } }
+
+##
+# @SystemFirmwareType:
+#
+# Lists system firmware types commonly used with QEMU virtual machines.
+#
+# @bios: The system firmware was built from the SeaBIOS project.
+#
+# @slof: The system firmware was built from the Slimline Open Firmware project.
+#
+# @uboot: The system firmware was built from the U-Boot project.
+#
+# @uefi: The system firmware was built from the edk2 (EFI Development Kit II)
+# project.
+#
+# Since: 2.13
+##
+{ 'enum' : 'SystemFirmwareType',
+ 'data' : [ 'bios', 'slof', 'uboot', 'uefi' ]
}
+
+##
+# @SystemFirmware:
+#
+# Describes a system firmware binary and any NVRAM slots that it requires.
+#
+# @executable: Identifies the platform firmware executable.
+#
+# @type: The type by which the system firmware is commonly known. This is the
+# main search key by which management software looks up a system
+# firmware image for a new domain.
+#
+# @targets: a non-empty list of target architectures that are capable of
+# executing the system firmware
+#
+# @sysfw-map: the mapping requirements of the system firmware binary
+#
+# @nvram-slots: A list of NVRAM slots that are required by the system firmware.
+# The @slot-id field must be unique across the list. Importantly,
+# if any @FirmwareAccess is @restricted-to-secure-context in
+# @sysfw-map or in any @nvram-map in @nvram-slots, then (a) the
+# virtual machine configuration is required to emulate the secure
+# code execution context (as defined for @targets), and (b) the
+# virtual machine configuration is required to actually restrict
+# the access in question to the secure execution context.
+#
+# @supports-uefi-secure-boot: Whether the system firmware implements the
+# software interfaces for UEFI Secure Boot, as
+# defined in the UEFI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-amd-sev: Whether the system firmware supports running under AMD
+# Secure Encrypted Virtualization, as specified in the AMD64
+# Architecture Programmer's Manual. If the field is missing,
+# its assumed value is 'false'.
+#
+# @supports-acpi-s3: Whether the system firmware supports S3 sleep (suspend to
+# RAM), as defined in the ACPI specification. If the field
+# is missing, its assumed value is 'false'.
+#
+# @supports-acpi-s4: Whether the system firmware supports S4 hibernation
+# (suspend to disk), as defined in the ACPI specification.
+# If the field is missing, its assumed value is 'false'.
I think these should just be an enum again
"FirmwareFeatures": [ "secure-boot", "amd-sev",
"acpi-s3", "acpi-s4" ]
+#
+# Since: 2.13
+#
+# Examples:
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/seabios/bios-256k.bin",
+# "description": "SeaBIOS",
+# "tags": [
+# "CONFIG_ROM_SIZE=256"
+# ]
+# },
+# "type": "bios",
+# "targets": [
+# "i386",
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "memory",
+# "write": "denied"
+# },
+# "supports-acpi-s3": true,
+# "supports-acpi-s4": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
+# "description": "OVMF with Secure Boot and SMM-protected
varstore",
+# "tags": [
+# "FD_SIZE_4MB",
+# "IA32X64",
+# "SECURE_BOOT_ENABLE",
+# "SMM_REQUIRE"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash",
+# "write": "restricted-to-secure-context"
+# },
+# "templates": [
+# {
+# "pathname": "/usr/share/OVMF/OVMF_VARS.fd",
+# "description": "empty varstore template"
+# },
+# {
+# "pathname":
"/usr/share/OVMF/OVMF_VARS.secboot.fd",
+# "description": "varstore template with the
Microsoft certificates enrolled for Secure Boot",
+# "tags": [
+# "mscerts"
+# ]
The tags field is arbitrary firmware specific strings with no pre-declared
meaning. So we need to provide a explicit way to represent features against
this, such that libvirt can determine the secure boot vars file.
+# }
+# ]
+# }
+# ],
+# "supports-uefi-secure-boot": true,
+# "supports-amd-sev": true,
+# "supports-acpi-s3": true
+# }
+#
+# {
+# "executable": {
+# "pathname": "/usr/share/AAVMF/AAVMF_CODE.fd",
+# "description": "ARM64 UEFI firmware",
+# "tags": [
+# "AARCH64"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "aarch64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash"
+# },
+# "templates": [
+# {
+# "pathname": "/usr/share/AAVMF/AAVMF_VARS.fd",
+# "description": "empty varstore template"
+# }
+# ]
+# }
+# ]
+# }
+#
+# {
+# "executable": {
+# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_CODE-pure-efi.fd",
+# "description": "32-bit OVMF with unprotected varstore and no
Secure Boot",
+# "tags": [
+# "FD_SIZE_2MB",
+# "IA32"
+# ]
+# },
+# "type": "uefi",
+# "targets": [
+# "i386",
+# "x86_64"
+# ],
+# "sysfw-map": {
+# "device": "flash",
+# "write": "denied"
+# },
+# "nvram-slots": [
+# {
+# "slot-id": 1,
+# "nvram-map" : {
+# "device": "flash"
+# },
+# "templates": [
+# {
+# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_VARS-pure-efi.fd",
+# "description": "empty varstore template"
+# }
+# ]
+# }
+# ],
+# "supports-acpi-s3": true
+# }
+##
+{ 'struct' : 'SystemFirmware',
+ 'data' : { 'executable' : 'FirmwareFile',
+ 'type' : 'SystemFirmwareType',
+ 'targets' : [ 'str' ],
+ 'sysfw-map' : 'FirmwareMapping',
+ '*nvram-slots' : [ 'NVRAMSlot' ],
+ '*supports-uefi-secure-boot' : 'bool',
+ '*supports-amd-sev' : 'bool',
+ '*supports-acpi-s3' : 'bool',
+ '*supports-acpi-s4' : 'bool' } }
+
+##
+# @x-check-firmware:
+#
+# Accept a @SystemFirmware object and do nothing, successfully. This command
+# can be used in the QMP shell to validate @SystemFirmware JSON against the
+# schema, and to pretty print it.
+#
+# @sysfw: ignored
+#
+# Since: 2.13
+##
+{ 'command' : 'x-check-firmware',
+ 'data' : { 'sysfw' : 'SystemFirmware' } }
The "json_reformat" command line tool can be used for reformatting
I wonder if we could usefully provide a command line tool for qemu to
validate against qapi schemas ? eg something like
qemu-qapi-validate --type=SystemFirmware /path/to/schema /path/to/document
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
12:57 p.m.
On 04/09/18 10:49, Daniel P. Berrangé wrote:
On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:
> Add a schema that describes the properties of virtual machine firmware.
>
> Each firmware executable installed on a host system should come with a
> JSON file that conforms to this schema, and informs the management
> applications about the firmware's properties.
>
> In addition, a configuration directory with symlinks to the JSON files
> should exist, with the symlinks carefully named to reflect a priority
> order. Management applications can then search this directory in priority
> order for the first firmware executable that satisfies their search
> criteria. The found JSON file provides the management layer with domain
> configuration bits that are required to run the firmware binary.
>
> Cc: "Daniel P. Berrange" <berrange(a)redhat.com>
> Cc: Alexander Graf <agraf(a)suse.de>
> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org>
> Cc: David Gibson <dgibson(a)redhat.com>
> Cc: Eric Blake <eblake(a)redhat.com>
> Cc: Gary Ching-Pang Lin <glin(a)suse.com>
> Cc: Gerd Hoffmann <kraxel(a)redhat.com>
> Cc: Kashyap Chamarthy <kchamart(a)redhat.com>
> Cc: Markus Armbruster <armbru(a)redhat.com>
> Cc: Michael Roth <mdroth(a)linux.vnet.ibm.com>
> Cc: Michal Privoznik <mprivozn(a)redhat.com>
> Cc: Peter Krempa <pkrempa(a)redhat.com>
> Cc: Peter Maydell <peter.maydell(a)linaro.org>
> Cc: Thomas Huth <thuth(a)redhat.com>
> Signed-off-by: Laszlo Ersek <lersek(a)redhat.com>
> ---
>
> Notes:
> Folks on the CC list, please try to see if the suggested schema is
> flexible enough to describe the virtual firmware(s) that you are
> familiar with. Thanks!
>
> Makefile | 9 ++
> Makefile.objs | 4 +
> qapi/firmware.json | 343 ++++++++++++++++++++++++++++++++++++++++++++++++++
> qapi/qapi-schema.json | 1 +
> qmp.c | 5 +
> .gitignore | 4 +
> 6 files changed, 366 insertions(+)
> create mode 100644 qapi/firmware.json
>
> diff --git a/qapi/firmware.json b/qapi/firmware.json
> new file mode 100644
> index 000000000000..f267240f44dd
> --- /dev/null
> +++ b/qapi/firmware.json
> @@ -0,0 +1,343 @@
> +# -*- Mode: Python -*-
> +
> +##
> +# = Firmware
> +##
> +
> +##
> +# @FirmwareDevice:
> +#
> +# Defines the device types that a firmware file can be mapped into.
> +#
> +# @memory: The firmware file is to be mapped into memory.
> +#
> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
> +# similar to @memory but may imply additional processing that is
> +# specific to the target architecture.
> +#
> +# @flash: The firmware file is to be mapped into a pflash chip.
> +#
> +# Since: 2.13
> +##
> +{ 'enum' : 'FirmwareDevice',
> + 'data' : [ 'memory', 'kernel', 'flash' ] }
> +
> +##
> +# @FirmwareAccess:
> +#
> +# Defines the possible permissions for a given access mode to a device that
> +# maps a firmware file.
> +#
> +# @denied: The access is denied.
> +#
> +# @permitted: The access is permitted.
> +#
> +# @restricted-to-secure-context: The access is permitted for guest code that
> +# runs in a secure context; otherwise the access
> +# is denied. The definition of "secure
context"
> +# is specific to the target architecture.
> +#
> +# Since: 2.13
> +##
> +{ 'enum' : 'FirmwareAccess',
> + 'data' : [ 'denied', 'permitted',
'restricted-to-secure-context' ] }
I'm not really understanding the purpose of this - what does it map to
on the command line ?
That's difficult to answer generally, because -bios and -kernel have
different meanings per board type. So I didn't aim at command line
switches here; instead I tried to capture where and how the firmware
wants to "end up" in the virtual hardware. How that maps to a particular
board is a separate question.
For example, OVMF can be loaded in a multitude of ways:
(1) "OVMF.fd" (a unified image that contains an executable and a live
variable store too) can be loaded with "-bios". This will place the full
image into ROM (that is FirmwareDevice=memory, read and exec: permitted,
write: denied). This will not provide a spec-compatible UEFI variable
service to the guest, but many people use OVMF like this. The libvirt
domain XML can accommodate this case:
<loader type='rom'>OVMF.fd</loader>
(2) "OVMF.fd" can be loaded into a single pflash chip (single pflash
drive, read/write). The command line switch is "-drive
if=pflash,format=raw,file=OVMF.fd,unit=0,readonly=off". This gives the
guest a spec-compliant UEFI variable service; however, the variable
store is inseparable from the firmware binary, and upgrading the latter
without losing the former is not possible, from a packaging perspective.
This maps to FirmwareDevice=flash, with all of
read/write/exec=permitted. Libvirt can describe this too in the domain XML:
<loader type='pflash' readonly='no'>OVMF.fd</loader>
(3) Now we're coming to the split image, namely OVMF_CODE.fd, and a
*copy of* the OVMF_VARS.fd template. This is mapped with
-drive if=pflash,format=raw,file=OVMF_CODE.fd,unit=0,readonly=on \
-drive if=pflash,format=raw,file=varstore.fd,unit=1,readonly=off
To the guest, it looks like (2), but on the host side, it allows for
centralized firmware binary upgrades, while preserving the domains'
variable stores. This maps to (a) the system firwmare with
FirmwareDevice=flash, read/exec: permitted, and write: denied; and (b)
one nvramslot with FirmwareDevice=flash, and read/exec/write: permitted.
The domain XML fragment is
<loader type='pflash'
readonly='yes'>OVMF_CODE.fd</loader>
<nvram>varstore.fd</nvram>
(4) An extension of (3) is when write accesses to the variable store are
restricted to code that runs in SMM. The QEMU options are:
-drive if=pflash,format=raw,file=OVMF_CODE.fd,unit=0,readonly=on \
-drive if=pflash,format=raw,file=varstore.fd,unit=1,readonly=off \
-machine <pc-q35-2.4+>,smm=on \
-global driver=cfi.pflash01,property=secure,value=on \
This maps to (a) the system firwmare with FirmwareDevice=flash,
read/exec: permitted, and write: denied; and (b) one nvramslot with
FirmwareDevice=flash, read/exec: permitted, write:
restricted-to-secure-context.
The domain XML fragment is
<os>
<type arch='x86_64' machine='pc-q35-2.4+'>hvm</type>
<loader type='pflash' readonly='yes'
secure='yes'>OVMF_CODE.fd</loader>
<nvram>varstore.fd</nvram>
</os>
<features>
<smm state='on'/>
</features>
On other target arches, "restricted-to-secure-context" may be defined
differently from "x86 SMM"; for example on aarch64, TrustZone / "secure
world" exist, as far as I know. (The edk2 project doesn't have any
upstream core code for supporting that though.) The command line
switches could be quite different.
So, the schema intends to describe the mapping that the firmware expects
from the board. How that is implemented on the QEMU command line is left
as an exercise to ... libvirtd. :)
> +
> +##
> +# @FirmwareMapping:
> +#
> +# Collects the mapping device type and the access permissions to that device
> +# for system firmware and for NVRAM slots.
> +#
> +# @device: The system firmware or the NVRAM slot must reside in a device of
> +# this type.
> +#
> +# @read: Permission for the guest to read the device that maps the firmware
> +# file. If the field is missing, @permitted is assumed.
> +#
> +# @write: Permission for the guest to write the device that maps the firmware
> +# file. If the field is missing, @permitted is assumed.
> +#
> +# @execute: Permission for the guest to execute code from the device that maps
> +# the firmware file. If the field is missing, @permitted is assumed.
> +#
> +# Since: 2.13
> +##
> +{ 'struct' : 'FirmwareMapping',
> + 'data' : { 'device' : 'FirmwareDevice',
> + '*read' : 'FirmwareAccess',
> + '*write' : 'FirmwareAccess',
> + '*execute' : 'FirmwareAccess' } }
Again, what this this map to on the command line ?
> +##
> +# @FirmwareFile:
> +#
> +# Gathers the common traits of system firmware executables and NVRAM templates.
> +#
> +# @pathname: absolute pathname of the firmware file on the host filesystem
> +#
> +# @description: human-readable description of the firmware file
> +#
> +# @tags: a list of machine-readable strings providing additional information
This makes it look like this information is something applications should be
using when setting up firmwares, which is definitely not what we want. Lets
rename this
"@build_options: arbitrary list of firmware specific build options, for
informative purposes only. Applications should not attempt
to interpret / assign meaning to these options"
Hmmm, I agree with you half-way here. I'm not saying that applications
*should* consult the tags, but they might want let the user express a
search condition for the tags. Near the end of the RFC, there's an
example JSON where the sole nvramslot advertizes two variable store
templates (both of which are compatible with the firmware and the
nvramslot from a technical POV). However, one varstore template is
logically empty, and the other varstore template has the MS certificates
pre-enrolled and Secure Boot enabled. If the new domain is created with
an OS installer that is not signed at all, the choice of varstore
template can make a big difference. And, the way I could distinguish
these two templates from each other (in a machine readable format) is
the "tags" list -- pls. search the RFC for the string
'"mscerts"'.
I figured either the apps or the user might want to decide about the
varstore template.
> +# @format: If the @FirmwareDevice that this @FirmwareFile is mapped into is
> +# @flash, then @format describes the block format of the drive that
> +# backs the device. Otherwise, this field should be 'raw' or
absent.
> +# If the field is missing, 'raw' is assumed.
Why does the format needed ?
If the firmware is to be loaded via a block device driver, then it should
not matter what format is used. If the mgmt app wants to take the firmware
file and convert it to qcow2 format that's fine - the code loading this
in QEMU will still see raw content.
The pflash device model has a backing drive, and the block format for
that drive can be qcow2 or raw (or other things), in theory anyway
(libvirt only supports raw now). Block format probing is discouraged, so
if the firmware package (on the host) provides the firmware binary
and/or the variable store template in qcow2 block format, then the tools
should know about that without probing.
Indeed it does not matter to the guest (the block format is a backend
property), but it's a detail that the firmware package should expose to
the host toolstack.
> +#
> +# Since: 2.13
> +##
> +{ 'struct' : 'FirmwareFile',
> + 'data' : { 'pathname' : 'str',
> + '*description' : 'str',
> + '*tags' : [ 'str' ],
> + '*format' : 'str' } }
> +
> +##
> +# @NVRAMSlot:
> +#
> +# Defines the mapping properties of an NVRAM slot, and associates compatible
> +# NVRAM templates with the NVRAM slot.
> +#
> +# @slot-id: The numeric identifier of the NVRAM slot. The interpretation of
> +# @slot-id is specific to the target architecture and the chosen
> +# system firmware.
What does this correspond to at the CLI level ? Is this the -drive unit=NN
option when loading via a block device ?
Yes, for i440fx and q35 with pflash, such a mapping makes sense. For
other target arches and board types, the mapping could be different (in
Thomas's example a uint64_t slot-id isn't even expressive enough).
Following your earlier advice, I tried to accommodate arches and boards
that I know nothing about :) , so I added the field mainly as a
placeholder, and to tell apart nvramslots. (In fact, nvram-slots,
*plural*, is already speculative generality, because I know of no board
that takes more than one nvram / pflash chip. But, turning that field
into a list wasn't too hard, and it can save us some headache down the
road. In turn I thought it prudent to add a slot-id, just to ensure some
kind of unicity.)
How slot-id is mapped to an actual board is left to libvirtd C code :)
> +#
> +# @nvram-map: the mapping requirements of this NVRAM slot
> +#
> +# @templates: A non-empty list of @FirmwareFile elements. Any @FirmwareFile
> +# identified by this list as an NVRAM template can be copied to
> +# create an actual NVRAM file, and the NVRAM file can be mapped
> +# into the NVRAM slot identified by @slot-id, subject to the
> +# mapping requirements in @nvram-map.
> +#
> +# Since: 2.13
> +##
> +{ 'struct' : 'NVRAMSlot',
> + 'data' : { 'slot-id' : 'uint64',
> + 'nvram-map' : 'FirmwareMapping',
> + 'templates' : [ 'FirmwareFile' ] } }
> +
> +##
> +# @SystemFirmwareType:
> +#
> +# Lists system firmware types commonly used with QEMU virtual machines.
> +#
> +# @bios: The system firmware was built from the SeaBIOS project.
> +#
> +# @slof: The system firmware was built from the Slimline Open Firmware project.
> +#
> +# @uboot: The system firmware was built from the U-Boot project.
> +#
> +# @uefi: The system firmware was built from the edk2 (EFI Development Kit II)
> +# project.
> +#
> +# Since: 2.13
> +##
> +{ 'enum' : 'SystemFirmwareType',
> + 'data' : [ 'bios', 'slof', 'uboot', 'uefi'
] }
> +
> +##
> +# @SystemFirmware:
> +#
> +# Describes a system firmware binary and any NVRAM slots that it requires.
> +#
> +# @executable: Identifies the platform firmware executable.
> +#
> +# @type: The type by which the system firmware is commonly known. This is the
> +# main search key by which management software looks up a system
> +# firmware image for a new domain.
> +#
> +# @targets: a non-empty list of target architectures that are capable of
> +# executing the system firmware
> +#
> +# @sysfw-map: the mapping requirements of the system firmware binary
> +#
> +# @nvram-slots: A list of NVRAM slots that are required by the system firmware.
> +# The @slot-id field must be unique across the list. Importantly,
> +# if any @FirmwareAccess is @restricted-to-secure-context in
> +# @sysfw-map or in any @nvram-map in @nvram-slots, then (a) the
> +# virtual machine configuration is required to emulate the secure
> +# code execution context (as defined for @targets), and (b) the
> +# virtual machine configuration is required to actually restrict
> +# the access in question to the secure execution context.
> +#
> +# @supports-uefi-secure-boot: Whether the system firmware implements the
> +# software interfaces for UEFI Secure Boot, as
> +# defined in the UEFI specification. If the field
> +# is missing, its assumed value is 'false'.
> +#
> +# @supports-amd-sev: Whether the system firmware supports running under AMD
> +# Secure Encrypted Virtualization, as specified in the AMD64
> +# Architecture Programmer's Manual. If the field is missing,
> +# its assumed value is 'false'.
> +#
> +# @supports-acpi-s3: Whether the system firmware supports S3 sleep (suspend to
> +# RAM), as defined in the ACPI specification. If the field
> +# is missing, its assumed value is 'false'.
> +#
> +# @supports-acpi-s4: Whether the system firmware supports S4 hibernation
> +# (suspend to disk), as defined in the ACPI specification.
> +# If the field is missing, its assumed value is 'false'.
I think these should just be an enum again
"FirmwareFeatures": [ "secure-boot", "amd-sev",
"acpi-s3", "acpi-s4" ]
You mean a list of such enum constants? That makes sense. (I figured
individual fields would be easier to filter for, but I agree that a list
of enum constants is more frugal in the schema.)
> +#
> +# Since: 2.13
> +#
> +# Examples:
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/seabios/bios-256k.bin",
> +# "description": "SeaBIOS",
> +# "tags": [
> +# "CONFIG_ROM_SIZE=256"
> +# ]
> +# },
> +# "type": "bios",
> +# "targets": [
> +# "i386",
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "memory",
> +# "write": "denied"
> +# },
> +# "supports-acpi-s3": true,
> +# "supports-acpi-s4": true
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/OVMF/OVMF_CODE.secboot.fd",
> +# "description": "OVMF with Secure Boot and SMM-protected
varstore",
> +# "tags": [
> +# "FD_SIZE_4MB",
> +# "IA32X64",
> +# "SECURE_BOOT_ENABLE",
> +# "SMM_REQUIRE"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash",
> +# "write": "restricted-to-secure-context"
> +# },
> +# "templates": [
> +# {
> +# "pathname":
"/usr/share/OVMF/OVMF_VARS.fd",
> +# "description": "empty varstore template"
> +# },
> +# {
> +# "pathname":
"/usr/share/OVMF/OVMF_VARS.secboot.fd",
> +# "description": "varstore template with the
Microsoft certificates enrolled for Secure Boot",
> +# "tags": [
> +# "mscerts"
> +# ]
The tags field is arbitrary firmware specific strings with no pre-declared
meaning. So we need to provide a explicit way to represent features against
this, such that libvirt can determine the secure boot vars file.
Right. So I guess I should keep the "tags" fields (with free-form
strings), but also introduce at least two enum types, one with "system
firmware features" and another with "nvramslot template features". And
then use lists of those.
Any advice on how to separate these enum types? For example, can we
assume that two enum types in total will suffice, because we can lump
the features for all templates of all nvram slots of all boards of all
architectures into a single NVRAMSlotTemplateFeature enum type?
> +# }
> +# ]
> +# }
> +# ],
> +# "supports-uefi-secure-boot": true,
> +# "supports-amd-sev": true,
> +# "supports-acpi-s3": true
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname": "/usr/share/AAVMF/AAVMF_CODE.fd",
> +# "description": "ARM64 UEFI firmware",
> +# "tags": [
> +# "AARCH64"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "aarch64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash"
> +# },
> +# "templates": [
> +# {
> +# "pathname":
"/usr/share/AAVMF/AAVMF_VARS.fd",
> +# "description": "empty varstore template"
> +# }
> +# ]
> +# }
> +# ]
> +# }
> +#
> +# {
> +# "executable": {
> +# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_CODE-pure-efi.fd",
> +# "description": "32-bit OVMF with unprotected varstore and
no Secure Boot",
> +# "tags": [
> +# "FD_SIZE_2MB",
> +# "IA32"
> +# ]
> +# },
> +# "type": "uefi",
> +# "targets": [
> +# "i386",
> +# "x86_64"
> +# ],
> +# "sysfw-map": {
> +# "device": "flash",
> +# "write": "denied"
> +# },
> +# "nvram-slots": [
> +# {
> +# "slot-id": 1,
> +# "nvram-map" : {
> +# "device": "flash"
> +# },
> +# "templates": [
> +# {
> +# "pathname":
"/usr/share/edk2.git/ovmf-ia32/OVMF_VARS-pure-efi.fd",
> +# "description": "empty varstore template"
> +# }
> +# ]
> +# }
> +# ],
> +# "supports-acpi-s3": true
> +# }
> +##
> +{ 'struct' : 'SystemFirmware',
> + 'data' : { 'executable' :
'FirmwareFile',
> + 'type' : 'SystemFirmwareType',
> + 'targets' : [ 'str' ],
> + 'sysfw-map' : 'FirmwareMapping',
> + '*nvram-slots' : [ 'NVRAMSlot' ],
> + '*supports-uefi-secure-boot' : 'bool',
> + '*supports-amd-sev' : 'bool',
> + '*supports-acpi-s3' : 'bool',
> + '*supports-acpi-s4' : 'bool' } }
> +
> +##
> +# @x-check-firmware:
> +#
> +# Accept a @SystemFirmware object and do nothing, successfully. This command
> +# can be used in the QMP shell to validate @SystemFirmware JSON against the
> +# schema, and to pretty print it.
> +#
> +# @sysfw: ignored
> +#
> +# Since: 2.13
> +##
> +{ 'command' : 'x-check-firmware',
> + 'data' : { 'sysfw' : 'SystemFirmware' } }
The "json_reformat" command line tool can be used for reformatting
Awesome, thanks for the tip!
I wonder if we could usefully provide a command line tool for qemu
to
validate against qapi schemas ? eg something like
qemu-qapi-validate --type=SystemFirmware /path/to/schema /path/to/document
That would be a useful tool; I'd use it if it existed :)
If I must, I can tack it to my todo list. It wouldn't be my preference
right now.
Thanks
Laszlo
4:18 a.m.
On Mon, Apr 09, 2018 at 07:57:54PM +0200, Laszlo Ersek wrote:
On 04/09/18 10:49, Daniel P. Berrangé wrote:
> On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:
>> Add a schema that describes the properties of virtual machine firmware.
>>
>> Each firmware executable installed on a host system should come with a
>> JSON file that conforms to this schema, and informs the management
>> applications about the firmware's properties.
>>
>> In addition, a configuration directory with symlinks to the JSON files
>> should exist, with the symlinks carefully named to reflect a priority
>> order. Management applications can then search this directory in priority
>> order for the first firmware executable that satisfies their search
>> criteria. The found JSON file provides the management layer with domain
>> configuration bits that are required to run the firmware binary.
>>
>> Cc: "Daniel P. Berrange" <berrange(a)redhat.com>
>> Cc: Alexander Graf <agraf(a)suse.de>
>> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org>
>> Cc: David Gibson <dgibson(a)redhat.com>
>> Cc: Eric Blake <eblake(a)redhat.com>
>> Cc: Gary Ching-Pang Lin <glin(a)suse.com>
>> Cc: Gerd Hoffmann <kraxel(a)redhat.com>
>> Cc: Kashyap Chamarthy <kchamart(a)redhat.com>
>> Cc: Markus Armbruster <armbru(a)redhat.com>
>> Cc: Michael Roth <mdroth(a)linux.vnet.ibm.com>
>> Cc: Michal Privoznik <mprivozn(a)redhat.com>
>> Cc: Peter Krempa <pkrempa(a)redhat.com>
>> Cc: Peter Maydell <peter.maydell(a)linaro.org>
>> Cc: Thomas Huth <thuth(a)redhat.com>
>> Signed-off-by: Laszlo Ersek <lersek(a)redhat.com>
>> ---
>>
>> Notes:
>> Folks on the CC list, please try to see if the suggested schema is
>> flexible enough to describe the virtual firmware(s) that you are
>> familiar with. Thanks!
>>
>> Makefile | 9 ++
>> Makefile.objs | 4 +
>> qapi/firmware.json | 343 ++++++++++++++++++++++++++++++++++++++++++++++++++
>> qapi/qapi-schema.json | 1 +
>> qmp.c | 5 +
>> .gitignore | 4 +
>> 6 files changed, 366 insertions(+)
>> create mode 100644 qapi/firmware.json
>>
>
>> diff --git a/qapi/firmware.json b/qapi/firmware.json
>> new file mode 100644
>> index 000000000000..f267240f44dd
>> --- /dev/null
>> +++ b/qapi/firmware.json
>> @@ -0,0 +1,343 @@
>> +# -*- Mode: Python -*-
>> +
>> +##
>> +# = Firmware
>> +##
>> +
>> +##
>> +# @FirmwareDevice:
>> +#
>> +# Defines the device types that a firmware file can be mapped into.
>> +#
>> +# @memory: The firmware file is to be mapped into memory.
>> +#
>> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
>> +# similar to @memory but may imply additional processing that is
>> +# specific to the target architecture.
>> +#
>> +# @flash: The firmware file is to be mapped into a pflash chip.
>> +#
>> +# Since: 2.13
>> +##
>> +{ 'enum' : 'FirmwareDevice',
>> + 'data' : [ 'memory', 'kernel', 'flash' ] }
>> +
>> +##
>> +# @FirmwareAccess:
>> +#
>> +# Defines the possible permissions for a given access mode to a device that
>> +# maps a firmware file.
>> +#
>> +# @denied: The access is denied.
>> +#
>> +# @permitted: The access is permitted.
>> +#
>> +# @restricted-to-secure-context: The access is permitted for guest code that
>> +# runs in a secure context; otherwise the
access
>> +# is denied. The definition of "secure
context"
>> +# is specific to the target architecture.
>> +#
>> +# Since: 2.13
>> +##
>> +{ 'enum' : 'FirmwareAccess',
>> + 'data' : [ 'denied', 'permitted',
'restricted-to-secure-context' ] }
>
> I'm not really understanding the purpose of this - what does it map to
> on the command line ?
That's difficult to answer generally, because -bios and -kernel have
different meanings per board type. So I didn't aim at command line
switches here; instead I tried to capture where and how the firmware
wants to "end up" in the virtual hardware. How that maps to a particular
board is a separate question.
I tend to think that defining a mapping to command line arguments is a key
feature that this should cover. Even if there variations across boards, QEMU
still has a small finite set of approaches to configure firmware, so it does
not feel unreasonable to define what they are and how they map to thes firmware
files.
Your FirmwareDevice enum above with "memory", "kernel" and
"flash" has
pretty much suggested the -bios, -kernel or -drive if=flash args anway
So, the schema intends to describe the mapping that the firmware
expects
from the board. How that is implemented on the QEMU command line is left
as an exercise to ... libvirtd. :)
I think this is pretty unhelpful. Essentially that is saying here is a big
pile of information about firmware, but we're not going to tell you how to
use it correctly, everyone must figure it out themselves.
>> +##
>> +# @FirmwareFile:
>> +#
>> +# Gathers the common traits of system firmware executables and NVRAM
templates.
>> +#
>> +# @pathname: absolute pathname of the firmware file on the host filesystem
>> +#
>> +# @description: human-readable description of the firmware file
>> +#
>> +# @tags: a list of machine-readable strings providing additional information
>
> This makes it look like this information is something applications should be
> using when setting up firmwares, which is definitely not what we want. Lets
> rename this
>
> "@build_options: arbitrary list of firmware specific build options, for
> informative purposes only. Applications should not attempt
> to interpret / assign meaning to these options"
Hmmm, I agree with you half-way here. I'm not saying that applications
*should* consult the tags, but they might want let the user express a
search condition for the tags. Near the end of the RFC, there's an
example JSON where the sole nvramslot advertizes two variable store
templates (both of which are compatible with the firmware and the
nvramslot from a technical POV). However, one varstore template is
logically empty, and the other varstore template has the MS certificates
pre-enrolled and Secure Boot enabled. If the new domain is created with
an OS installer that is not signed at all, the choice of varstore
template can make a big difference. And, the way I could distinguish
these two templates from each other (in a machine readable format) is
the "tags" list -- pls. search the RFC for the string
'"mscerts"'.
I don't think we should be using "tags" for the "mscerts"
information.
There should be some kind of explicit way to denote that the vars have
been pre-enrolled or not.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
6:27 a.m.
On 04/10/18 11:18, Daniel P. Berrangé wrote:
On Mon, Apr 09, 2018 at 07:57:54PM +0200, Laszlo Ersek wrote:
> On 04/09/18 10:49, Daniel P. Berrangé wrote:
>> On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:
>>> Add a schema that describes the properties of virtual machine firmware.
>>>
>>> Each firmware executable installed on a host system should come with a
>>> JSON file that conforms to this schema, and informs the management
>>> applications about the firmware's properties.
>>>
>>> In addition, a configuration directory with symlinks to the JSON files
>>> should exist, with the symlinks carefully named to reflect a priority
>>> order. Management applications can then search this directory in priority
>>> order for the first firmware executable that satisfies their search
>>> criteria. The found JSON file provides the management layer with domain
>>> configuration bits that are required to run the firmware binary.
>>>
>>> Cc: "Daniel P. Berrange" <berrange(a)redhat.com>
>>> Cc: Alexander Graf <agraf(a)suse.de>
>>> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org>
>>> Cc: David Gibson <dgibson(a)redhat.com>
>>> Cc: Eric Blake <eblake(a)redhat.com>
>>> Cc: Gary Ching-Pang Lin <glin(a)suse.com>
>>> Cc: Gerd Hoffmann <kraxel(a)redhat.com>
>>> Cc: Kashyap Chamarthy <kchamart(a)redhat.com>
>>> Cc: Markus Armbruster <armbru(a)redhat.com>
>>> Cc: Michael Roth <mdroth(a)linux.vnet.ibm.com>
>>> Cc: Michal Privoznik <mprivozn(a)redhat.com>
>>> Cc: Peter Krempa <pkrempa(a)redhat.com>
>>> Cc: Peter Maydell <peter.maydell(a)linaro.org>
>>> Cc: Thomas Huth <thuth(a)redhat.com>
>>> Signed-off-by: Laszlo Ersek <lersek(a)redhat.com>
>>> ---
>>>
>>> Notes:
>>> Folks on the CC list, please try to see if the suggested schema is
>>> flexible enough to describe the virtual firmware(s) that you are
>>> familiar with. Thanks!
>>>
>>> Makefile | 9 ++
>>> Makefile.objs | 4 +
>>> qapi/firmware.json | 343
++++++++++++++++++++++++++++++++++++++++++++++++++
>>> qapi/qapi-schema.json | 1 +
>>> qmp.c | 5 +
>>> .gitignore | 4 +
>>> 6 files changed, 366 insertions(+)
>>> create mode 100644 qapi/firmware.json
>>>
>>
>>> diff --git a/qapi/firmware.json b/qapi/firmware.json
>>> new file mode 100644
>>> index 000000000000..f267240f44dd
>>> --- /dev/null
>>> +++ b/qapi/firmware.json
>>> @@ -0,0 +1,343 @@
>>> +# -*- Mode: Python -*-
>>> +
>>> +##
>>> +# = Firmware
>>> +##
>>> +
>>> +##
>>> +# @FirmwareDevice:
>>> +#
>>> +# Defines the device types that a firmware file can be mapped into.
>>> +#
>>> +# @memory: The firmware file is to be mapped into memory.
>>> +#
>>> +# @kernel: The firmware file is to be loaded like a Linux kernel. This is
>>> +# similar to @memory but may imply additional processing that is
>>> +# specific to the target architecture.
>>> +#
>>> +# @flash: The firmware file is to be mapped into a pflash chip.
>>> +#
>>> +# Since: 2.13
>>> +##
>>> +{ 'enum' : 'FirmwareDevice',
>>> + 'data' : [ 'memory', 'kernel', 'flash' ]
}
>>> +
>>> +##
>>> +# @FirmwareAccess:
>>> +#
>>> +# Defines the possible permissions for a given access mode to a device that
>>> +# maps a firmware file.
>>> +#
>>> +# @denied: The access is denied.
>>> +#
>>> +# @permitted: The access is permitted.
>>> +#
>>> +# @restricted-to-secure-context: The access is permitted for guest code
that
>>> +# runs in a secure context; otherwise the
access
>>> +# is denied. The definition of "secure
context"
>>> +# is specific to the target architecture.
>>> +#
>>> +# Since: 2.13
>>> +##
>>> +{ 'enum' : 'FirmwareAccess',
>>> + 'data' : [ 'denied', 'permitted',
'restricted-to-secure-context' ] }
>>
>> I'm not really understanding the purpose of this - what does it map to
>> on the command line ?
>
> That's difficult to answer generally, because -bios and -kernel have
> different meanings per board type. So I didn't aim at command line
> switches here; instead I tried to capture where and how the firmware
> wants to "end up" in the virtual hardware. How that maps to a particular
> board is a separate question.
I tend to think that defining a mapping to command line arguments is a key
feature that this should cover. Even if there variations across boards, QEMU
still has a small finite set of approaches to configure firmware, so it does
not feel unreasonable to define what they are and how they map to thes firmware
files.
I agree, now that I've read about Gerd's similar argument.
There I made the suggestion that the schema could define enum constants
(mapping identifiers) that directly refer to libvirtd's existing logic
to map various firmware types.
Your FirmwareDevice enum above with "memory",
"kernel" and "flash" has
pretty much suggested the -bios, -kernel or -drive if=flash args anway
> So, the schema intends to describe the mapping that the firmware expects
> from the board. How that is implemented on the QEMU command line is left
> as an exercise to ... libvirtd. :)
I think this is pretty unhelpful. Essentially that is saying here is a big
pile of information about firmware, but we're not going to tell you how to
use it correctly, everyone must figure it out themselves.
I agree. In order to enable any new kind of firmware under libvirtd, the
firmware, QEMU and libvirtd folks have to collaborate anyway, to hash
out the details. Once that's all done, a firmware package that installs
a firmware image (+ nvram templates if any) of that kind should be
allowed to reference "that" mapping method precisely.
Initially I didn't realize that the firmware descriptor document (json
or XML maybe) could be allowed to target libvirtd specifically.
I do think the schema should *not* target the QEMU command line
directly; that's so complex and amorphous (considering all arches,
machine types and firmware types) that a hugely complex DSL should be
necessary for describing that. Instead, I think this enablement is done
in libvirtd, in C code anyway, so the firmware descriptor document
should just reference the necessary "enablement method".
>>> +##
>>> +# @FirmwareFile:
>>> +#
>>> +# Gathers the common traits of system firmware executables and NVRAM
templates.
>>> +#
>>> +# @pathname: absolute pathname of the firmware file on the host filesystem
>>> +#
>>> +# @description: human-readable description of the firmware file
>>> +#
>>> +# @tags: a list of machine-readable strings providing additional
information
>>
>> This makes it look like this information is something applications should be
>> using when setting up firmwares, which is definitely not what we want. Lets
>> rename this
>>
>> "@build_options: arbitrary list of firmware specific build options, for
>> informative purposes only. Applications should not attempt
>> to interpret / assign meaning to these options"
>
> Hmmm, I agree with you half-way here. I'm not saying that applications
> *should* consult the tags, but they might want let the user express a
> search condition for the tags. Near the end of the RFC, there's an
> example JSON where the sole nvramslot advertizes two variable store
> templates (both of which are compatible with the firmware and the
> nvramslot from a technical POV). However, one varstore template is
> logically empty, and the other varstore template has the MS certificates
> pre-enrolled and Secure Boot enabled. If the new domain is created with
> an OS installer that is not signed at all, the choice of varstore
> template can make a big difference. And, the way I could distinguish
> these two templates from each other (in a machine readable format) is
> the "tags" list -- pls. search the RFC for the string
'"mscerts"'.
I don't think we should be using "tags" for the "mscerts"
information.
There should be some kind of explicit way to denote that the vars have
been pre-enrolled or not.
Right.
Please go through the rest of the emails in this thread, and advise:
- if the firmware descriptor schema may perhaps live in the libvirt tree,
- accordingly, if the schema could be expressed as an XSD (and firmware
packages should provide the descriptor documents as XMLs)
- if you agree that the descriptor document can uniquely reference
mapping methods implemented in libvirtd by simple enum constants (with
necessary parameters provided).
I already have another RFC version in mind, but I'd like to clarify
these points first.
Thanks!
Laszlo
6:34 a.m.
On Tue, Apr 10, 2018 at 01:27:18PM +0200, Laszlo Ersek wrote:
Please go through the rest of the emails in this thread, and advise:
- if the firmware descriptor schema may perhaps live in the libvirt tree,
- accordingly, if the schema could be expressed as an XSD (and firmware
packages should provide the descriptor documents as XMLs)
- if you agree that the descriptor document can uniquely reference
mapping methods implemented in libvirtd by simple enum constants (with
necessary parameters provided).
No to all three. This is the responsibility of QEMU to define, because
this information is relevant to anything managing QEMU not just libvirt.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
6:44 a.m.
On 04/10/18 13:34, Daniel P. Berrangé wrote:
On Tue, Apr 10, 2018 at 01:27:18PM +0200, Laszlo Ersek wrote:
> Please go through the rest of the emails in this thread, and advise:
> - if the firmware descriptor schema may perhaps live in the libvirt tree,
> - accordingly, if the schema could be expressed as an XSD (and firmware
> packages should provide the descriptor documents as XMLs)
> - if you agree that the descriptor document can uniquely reference
> mapping methods implemented in libvirtd by simple enum constants (with
> necessary parameters provided).
No to all three. This is the responsibility of QEMU to define, because
this information is relevant to anything managing QEMU not just libvirt.
In that case, how do you suggest we describe the QEMU command line
options that are (a) necessary, (b) "discoverable" to the management
application? Should we provide verbatim command line fragments (option
templates)? Is this feature meant to replace the cmdline generation
logic that already exists in libvirtd?
Thanks
Laszlo
6:50 a.m.
On Tue, Apr 10, 2018 at 01:44:13PM +0200, Laszlo Ersek wrote:
On 04/10/18 13:34, Daniel P. Berrangé wrote:
> On Tue, Apr 10, 2018 at 01:27:18PM +0200, Laszlo Ersek wrote:
>
>> Please go through the rest of the emails in this thread, and advise:
>> - if the firmware descriptor schema may perhaps live in the libvirt tree,
>> - accordingly, if the schema could be expressed as an XSD (and firmware
>> packages should provide the descriptor documents as XMLs)
>> - if you agree that the descriptor document can uniquely reference
>> mapping methods implemented in libvirtd by simple enum constants (with
>> necessary parameters provided).
>
> No to all three. This is the responsibility of QEMU to define, because
> this information is relevant to anything managing QEMU not just libvirt.
In that case, how do you suggest we describe the QEMU command line
options that are (a) necessary, (b) "discoverable" to the management
application? Should we provide verbatim command line fragments (option
templates)? Is this feature meant to replace the cmdline generation
logic that already exists in libvirtd?
Each part of the schema should have docs describing what CLI args it
corresponds to. eg document that when device=memory, corresponds
to -bios, that device=flash, corresponds to -drive if=pflash, etc
We've not trying to replace the cmdline generator in libvirt. We just
want to know that when we see a particular field present in the schema,
that it corresponds to a particular cli arg.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
6:48 a.m.
On 10 April 2018 at 12:34, Daniel P. Berrangé <berrange(a)redhat.com> wrote:
On Tue, Apr 10, 2018 at 01:27:18PM +0200, Laszlo Ersek wrote:
> Please go through the rest of the emails in this thread, and advise:
> - if the firmware descriptor schema may perhaps live in the libvirt tree,
> - accordingly, if the schema could be expressed as an XSD (and firmware
> packages should provide the descriptor documents as XMLs)
> - if you agree that the descriptor document can uniquely reference
> mapping methods implemented in libvirtd by simple enum constants (with
> necessary parameters provided).
No to all three. This is the responsibility of QEMU to define, because
this information is relevant to anything managing QEMU not just libvirt.
(Please consider this as more of a grenade lobbed into the conversation
rather than a carefully thought out proposal...)
My inclination is to say that it's not really the responsibility
of QEMU to define either -- we provide emulated models of hardware,
and it's up to the user or the management layer or the provider
of the firmware to specify what guest code they want to run and how
it needs to run on that emulated hardware...
Where the QEMU upstream itself is providing firmware blobs
(in tarballs etc) it's probably our job to specify how they work,
but if the firmware is compiled and provided by the distro (as eg happens
for Arm UEFI blobs at the moment) then I don't see how upstream QEMU
can reliably define how that firmware needs to be loaded.
thanks
-- PMM
6:52 a.m.
On Tue, Apr 10, 2018 at 12:48:28PM +0100, Peter Maydell wrote:
On 10 April 2018 at 12:34, Daniel P. Berrangé
<berrange(a)redhat.com> wrote:
> On Tue, Apr 10, 2018 at 01:27:18PM +0200, Laszlo Ersek wrote:
>
>> Please go through the rest of the emails in this thread, and advise:
>> - if the firmware descriptor schema may perhaps live in the libvirt tree,
>> - accordingly, if the schema could be expressed as an XSD (and firmware
>> packages should provide the descriptor documents as XMLs)
>> - if you agree that the descriptor document can uniquely reference
>> mapping methods implemented in libvirtd by simple enum constants (with
>> necessary parameters provided).
>
> No to all three. This is the responsibility of QEMU to define, because
> this information is relevant to anything managing QEMU not just libvirt.
(Please consider this as more of a grenade lobbed into the conversation
rather than a carefully thought out proposal...)
My inclination is to say that it's not really the responsibility
of QEMU to define either -- we provide emulated models of hardware,
and it's up to the user or the management layer or the provider
of the firmware to specify what guest code they want to run and how
it needs to run on that emulated hardware...
Where the QEMU upstream itself is providing firmware blobs
(in tarballs etc) it's probably our job to specify how they work,
but if the firmware is compiled and provided by the distro (as eg happens
for Arm UEFI blobs at the moment) then I don't see how upstream QEMU
can reliably define how that firmware needs to be loaded.
QEMU should not provide the actual metadata files themselves - it just
has to the define the file format. The relevant firmware upstreams and
or distros, can provide the metadata files for the blobs they choose
to ship for use with QEMU.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
5:20 a.m.
On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:
Add a schema that describes the properties of virtual machine
firmware.
Each firmware executable installed on a host system should come with a
JSON file that conforms to this schema, and informs the management
applications about the firmware's properties.
In addition, a configuration directory with symlinks to the JSON files
should exist, with the symlinks carefully named to reflect a priority
order. Management applications can then search this directory in priority
order for the first firmware executable that satisfies their search
criteria. The found JSON file provides the management layer with domain
configuration bits that are required to run the firmware binary.
diff --git a/qapi/firmware.json b/qapi/firmware.json
new file mode 100644
index 000000000000..f267240f44dd
--- /dev/null
+++ b/qapi/firmware.json
[snip]
+{ 'struct' : 'SystemFirmware',
+ 'data' : { 'executable' : 'FirmwareFile',
+ 'type' : 'SystemFirmwareType',
+ 'targets' : [ 'str' ],
+ 'sysfw-map' : 'FirmwareMapping',
+ '*nvram-slots' : [ 'NVRAMSlot' ],
+ '*supports-uefi-secure-boot' : 'bool',
+ '*supports-amd-sev' : 'bool',
+ '*supports-acpi-s3' : 'bool',
+ '*supports-acpi-s4' : 'bool' } }
Elsewhere in the thread I mentioned that I think we should try to use a
union approach to isolate which information is relevant to "flash" loader
format and which is relevant to "memory" and "kernel". To try to
illustrate
what I mean by that I've knocked up an alternative structure. I also
incorporated the points about features & target/machine types. I've left
out the read/write/etc fields, but they could be put back in at the
relevant position
{ 'enum' : 'SystemFirmwareType',
'data' : [ 'bios', 'slof', 'uboot', 'uefi' ] }
{ 'enum' : 'SystemFirmwareDevice',
'data' : [ 'memory', 'kernel', 'flash' ] }
{ 'enum' : 'SystemFirmwareArchitecture',
'data': ['x86_64', 'i386', ..etc.. ] }
{ 'enum' : 'SystemFirmwareFeature',
'data': ['acpi-s3', 'acpi-s5', 'secure-boot',
'amd-sev' ]}
## Struct(s) for device==memory
{ 'struct': 'SystemFirmwareBinaryMemory',
'data': { 'pathname': 'str' } }
## Struct(s) for device==kernel
{ 'struct': 'SystemFirmwareBinaryKernel',
'data': { 'pathname': 'str' } }
## Struct(s) for device==flash
{ 'struct': 'SystemFirmwareBinaryFlashFile',
'data': { 'filename': 'str',
'format': 'BlockdevDriver' } }
{ 'struct': 'SystemFirmwareBinaryFlashCode',
'base': 'SystemFirmwareBinaryFlashFile' }
{ 'struct': 'SystemFirmwareBinaryFlashVars',
'base': 'SystemFirmwareBinaryFlashFile',
'data': { 'secure-boot-key-enroll': 'bool' } }
{ 'struct': 'SystemFirmwareBinaryFlash',
'data': { 'code': 'SystemFirmwareBinaryFlashCode',
'vars': ['SystemFirmwareBinaryFlashVars' ] } }
## Discriminated struct for different loading approaches
{ 'union': 'SystemFirmwareBinary',
'base': { 'device': 'SystemFirmwareDevice' },
'discriminator': 'device',
'data': { 'memory': 'SystemFirmwareBinaryMemory',
'kernel': 'SystemFirmwareBinaryKernel',
'flash': 'SystemFirmwareBinaryFlash' } }
{ 'struct' : 'SystemFirmwareTarget',
'data': { 'architecture': 'SystemFirmwareArchitecture',
'machines': [ 'str' ] } }
{ 'struct' : 'SystemFirmware',
'data' : {
'description' : 'str',
'type' : 'SystemFirmwareType',
'binary' : 'SystemFirmwareBinary',
'targets' : [ 'SystemFirmwareTarget' ],
'features' : ['SystemFirmwareFeature'] } }
# Examples:
#
# {
# 'description': 'SeaBIOS 256k',
# 'type': 'bios',
# 'binary': {
# 'type': 'memory',
# 'filename': '/path/to/seabios/rom-256k',
# }
# 'targets': {
# 'x86_64': [ "pc", "q35"],
# 'i386': [ "pc", "q35"],
# }
# 'features': ['acpi-s3', 'acpi-s5'],
# }
# {
# 'description': 'SeaBIOS 128k',
# 'type': 'bios',
# 'binary': {
# 'type': 'memory',
# 'filename': '/path/to/seabios/rom-128k',
# }
# 'targets': {
# 'x86_64': [ "isapc"],
# 'i386': [ "isapc"],
# }
# 'features': [],
# }
# {
# 'description': 'OVMF',
# 'type': 'uefi'
# 'binary': {
# 'type': 'flash',
# 'code': {
# 'filename': '/usr/share/OVMF/OVMF_CODE.secboot.fd',
# 'format': 'raw',
# },
# 'vars': [
# {
# 'filename': '/usr/share/OVMF/OVMF_VARS.fd',
# 'format': 'raw',
# 'secure=boot-key-enroll': false,
# },
# {
# 'filename': '/usr/share/OVMF/OVMF_VARS.secboot.fd',
# 'format': 'raw',
# 'secure=boot-key-enroll': true,
# }
# ],
# },
# 'targets': {
# 'x86_64': [ "q35"],
# }
# 'features': ['acpi-s3', 'acpi-s5', 'secure-boot'],
# }
#
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
6:03 a.m.
New subject: [libvirt] [Qemu-devel] [qemu RFC] qapi: add "firmware.json"
On Tue, Apr 10, 2018 at 11:20:33AM +0100, Daniel P. Berrangé wrote:
On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:
> Add a schema that describes the properties of virtual machine firmware.
>
> Each firmware executable installed on a host system should come with a
> JSON file that conforms to this schema, and informs the management
> applications about the firmware's properties.
>
> In addition, a configuration directory with symlinks to the JSON files
> should exist, with the symlinks carefully named to reflect a priority
> order. Management applications can then search this directory in priority
> order for the first firmware executable that satisfies their search
> criteria. The found JSON file provides the management layer with domain
> configuration bits that are required to run the firmware binary.
>
> diff --git a/qapi/firmware.json b/qapi/firmware.json
> new file mode 100644
> index 000000000000..f267240f44dd
> --- /dev/null
> +++ b/qapi/firmware.json
[snip]
> +{ 'struct' : 'SystemFirmware',
> + 'data' : { 'executable' :
'FirmwareFile',
> + 'type' :
'SystemFirmwareType',
> + 'targets' : [ 'str' ],
> + 'sysfw-map' : 'FirmwareMapping',
> + '*nvram-slots' : [ 'NVRAMSlot' ],
> + '*supports-uefi-secure-boot' : 'bool',
> + '*supports-amd-sev' : 'bool',
> + '*supports-acpi-s3' : 'bool',
> + '*supports-acpi-s4' : 'bool' } }
Elsewhere in the thread I mentioned that I think we should try to use a
union approach to isolate which information is relevant to "flash" loader
format and which is relevant to "memory" and "kernel". To try to
illustrate
what I mean by that I've knocked up an alternative structure. I also
incorporated the points about features & target/machine types. I've left
out the read/write/etc fields, but they could be put back in at the
relevant position
{ 'enum' : 'SystemFirmwareType',
'data' : [ 'bios', 'slof', 'uboot', 'uefi' ] }
{ 'enum' : 'SystemFirmwareDevice',
'data' : [ 'memory', 'kernel', 'flash' ] }
{ 'enum' : 'SystemFirmwareArchitecture',
'data': ['x86_64', 'i386', ..etc.. ] }
{ 'enum' : 'SystemFirmwareFeature',
'data': ['acpi-s3', 'acpi-s5', 'secure-boot',
'amd-sev' ]}
## Struct(s) for device==memory
{ 'struct': 'SystemFirmwareBinaryMemory',
'data': { 'pathname': 'str' } }
## Struct(s) for device==kernel
{ 'struct': 'SystemFirmwareBinaryKernel',
'data': { 'pathname': 'str' } }
## Struct(s) for device==flash
{ 'struct': 'SystemFirmwareBinaryFlashFile',
'data': { 'filename': 'str',
'format': 'BlockdevDriver' } }
{ 'struct': 'SystemFirmwareBinaryFlashCode',
'base': 'SystemFirmwareBinaryFlashFile' }
{ 'struct': 'SystemFirmwareBinaryFlashVars',
'base': 'SystemFirmwareBinaryFlashFile',
'data': { 'secure-boot-key-enroll': 'bool' } }
{ 'struct': 'SystemFirmwareBinaryFlash',
'data': { 'code': 'SystemFirmwareBinaryFlashCode',
'vars': ['SystemFirmwareBinaryFlashVars' ] } }
## Discriminated struct for different loading approaches
{ 'union': 'SystemFirmwareBinary',
'base': { 'device': 'SystemFirmwareDevice' },
'discriminator': 'device',
'data': { 'memory': 'SystemFirmwareBinaryMemory',
'kernel': 'SystemFirmwareBinaryKernel',
'flash': 'SystemFirmwareBinaryFlash' } }
{ 'struct' : 'SystemFirmwareTarget',
'data': { 'architecture': 'SystemFirmwareArchitecture',
'machines': [ 'str' ] } }
{ 'struct' : 'SystemFirmware',
'data' : {
'description' : 'str',
'type' : 'SystemFirmwareType',
'binary' : 'SystemFirmwareBinary',
'targets' : [ 'SystemFirmwareTarget' ],
'features' : ['SystemFirmwareFeature'] } }
# Examples:
#
# {
# 'description': 'SeaBIOS 256k',
# 'type': 'bios',
# 'binary': {
# 'type': 'memory',
# 'filename': '/path/to/seabios/rom-256k',
# }
# 'targets': {
# 'x86_64': [ "pc", "q35"],
# 'i386': [ "pc", "q35"],
# }
# 'features': ['acpi-s3', 'acpi-s5'],
# }
# {
# 'description': 'SeaBIOS 128k',
# 'type': 'bios',
# 'binary': {
# 'type': 'memory',
# 'filename': '/path/to/seabios/rom-128k',
# }
# 'targets': {
# 'x86_64': [ "isapc"],
# 'i386': [ "isapc"],
# }
# 'features': [],
# }
# {
# 'description': 'OVMF',
# 'type': 'uefi'
# 'binary': {
# 'type': 'flash',
# 'code': {
# 'filename': '/usr/share/OVMF/OVMF_CODE.secboot.fd',
# 'format': 'raw',
# },
# 'vars': [
# {
# 'filename': '/usr/share/OVMF/OVMF_VARS.fd',
# 'format': 'raw',
# 'secure=boot-key-enroll': false,
# },
# {
# 'filename': '/usr/share/OVMF/OVMF_VARS.secboot.fd',
# 'format': 'raw',
# 'secure=boot-key-enroll': true,
# }
It occurs to me that we are actually over-thinking things, by making it
possible to list a choice of vars files per firmware. We could remove this
special case by just having separate tpo level firmware entries and a main
feature flag to say if it is enrolled or not - see below example
# ],
# },
# 'targets': {
# 'x86_64': [ "q35"],
# }
# 'features': ['acpi-s3', 'acpi-s5', 'secure-boot'],
# }
#
{
'description': 'OVMF secboot',
'type': 'uefi'
'binary': {
'type': 'flash',
'code': {
'filename': '/usr/share/OVMF/OVMF_CODE.secboot.fd',
'format': 'raw',
},
'vars': {
'filename': '/usr/share/OVMF/OVMF_VARS.fd',
'format': 'raw',
},
},
'targets': {
'x86_64': [ "q35"],
}
'features': ['acpi-s3', 'acpi-s5', 'secure-boot'],
}
{
'description': 'OVMF secboot enrolled',
'type': 'uefi'
'binary': {
'type': 'flash',
'code': {
'filename': '/usr/share/OVMF/OVMF_CODE.secboot.fd',
'format': 'raw',
},
'vars': {
'filename': '/usr/share/OVMF/OVMF_VARS.secboot.fd',
'format': 'raw',
}
},
'targets': {
'x86_64': [ "q35"],
}
'features': ['acpi-s3', 'acpi-s5', 'secure-boot',
"secure-boot-enrolled-keys"],
}
Avoiding recording the notion of secureboot enrollment against the VARs
files, means that you have more flexibility. One could just have a single
file containing both CODE+VARS, which is enrolled instead of separating
them.
Regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
6:37 a.m.
New subject: [libvirt] [Qemu-devel] [qemu RFC] qapi: add "firmware.json"
Hi,
It occurs to me that we are actually over-thinking things, by making
it
possible to list a choice of vars files per firmware. We could remove this
special case by just having separate tpo level firmware entries and a main
feature flag to say if it is enrolled or not - see below example
That would also make it easier to implement something like ...
qemu -firmware json=/path/to/firmware/spec.json
... because you simply have two files for the enrolled/non-enrolled
variants.
cheers,
Gerd
7:12 a.m.
On 04/10/18 12:20, Daniel P. Berrangé wrote:
On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:
> +{ 'struct' : 'SystemFirmware',
> + 'data' : { 'executable' :
'FirmwareFile',
> + 'type' : 'SystemFirmwareType',
> + 'targets' : [ 'str' ],
> + 'sysfw-map' : 'FirmwareMapping',
> + '*nvram-slots' : [ 'NVRAMSlot' ],
> + '*supports-uefi-secure-boot' : 'bool',
> + '*supports-amd-sev' : 'bool',
> + '*supports-acpi-s3' : 'bool',
> + '*supports-acpi-s4' : 'bool' } }
Elsewhere in the thread I mentioned that I think we should try to use a
union approach to isolate which information is relevant to "flash" loader
format and which is relevant to "memory" and "kernel". To try to
illustrate
what I mean by that I've knocked up an alternative structure. I also
incorporated the points about features & target/machine types. I've left
out the read/write/etc fields, but they could be put back in at the
relevant position
I think this looks very nice; with the addition of
- "requires-smm" to "SystemFirmwareFeature":
{ 'enum' : 'SystemFirmwareFeature',
'data': ['acpi-s3', 'acpi-s5', 'secure-boot',
'amd-sev' ]}
- and another feature flag (perhaps in SystemFirmwareFeature, perhaps in
SystemFirmwareBinaryFlashVars) for the cmdline option "-global
driver=cfi.pflash01,property=secure,value=on",
this could be called a day as far as SeaBIOS and OVMF are concerned.
Thanks
Laszlo
2418
days inactive
2421
days old
47 comments
6 participants
participants (6)
-
Daniel P. Berrangé -
Gerd Hoffmann -
Laszlo Ersek -
Paolo Bonzini -
Peter Maydell -
Thomas Huth