7:41 a.m.
The intel-iommu device has existed since QEMU 2.2.0, but
it was only possible to create it with -device since
QEMU 2.7.0, thanks to:
commit 621d983a1f9051f4cfc3f402569b46b77d8449fc
Author: Marcel Apfelbaum <marcel(a)redhat.com>
Date: Mon Jun 27 18:38:34 2016 +0300
hw/iommu: enable iommu with -device
Use the standard '-device intel-iommu' to create the IOMMU device.
The legacy '-machine,iommu=on' can still be used.
The libvirt capability check & command line formatting code
is thus broken for all QEMU versions 2.2.0 -> 2.6.0 inclusive.
This fixes it to use iommu=on instead.
Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com>
---
src/qemu/qemu_capabilities.c | 13 ++++++++
src/qemu/qemu_capabilities.h | 3 ++
src/qemu/qemu_command.c | 22 +++++++++++++
.../qemuxml2argv-intel-iommu-machine.args | 21 ++++++++++++
.../qemuxml2argv-intel-iommu-machine.xml | 37 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 2 ++
6 files changed, 98 insertions(+)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.args
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.xml
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 2ca7803..9020247 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -342,6 +342,8 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
"smm",
"virtio-pci-disable-legacy",
"query-hotpluggable-cpus",
+
+ "machine-iommu", /* 235 */
);
@@ -3633,6 +3635,17 @@ virQEMUCapsInitQMPMonitor(virQEMUCapsPtr qemuCaps,
if (virQEMUCapsProbeQMPMigrationCapabilities(qemuCaps, mon) < 0)
goto cleanup;
+ /* 'intel-iommu' shows up as a device since 2.2.0, but can
+ * not be used with -device until 2.7.0. Before that it
+ * requires -machine iommu=on. So we must clear the device
+ * capability we detected on older QEMUs
+ */
+ if (qemuCaps->version < 2007000 &&
+ virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_INTEL_IOMMU)) {
+ virQEMUCapsClear(qemuCaps, QEMU_CAPS_DEVICE_INTEL_IOMMU);
+ virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_IOMMU);
+ }
+
/* GIC capabilities, eg. available GIC versions */
if ((qemuCaps->arch == VIR_ARCH_AARCH64 ||
qemuCaps->arch == VIR_ARCH_ARMV7L) &&
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index a74d39f..ce2b01a 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -376,6 +376,9 @@ typedef enum {
QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY, /* virtio-*pci.disable-legacy */
QEMU_CAPS_QUERY_HOTPLUGGABLE_CPUS, /* qmp command query-hotpluggable-cpus */
+ /* 235 */
+ QEMU_CAPS_MACHINE_IOMMU, /* -machine iommu=on */
+
QEMU_CAPS_LAST /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 982c33c..f2b579d 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -6349,6 +6349,9 @@ qemuBuildIOMMUCommandLine(virCommandPtr cmd,
if (!def->iommu)
return 0;
+ if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_IOMMU))
+ return 0; /* Already handled via -machine */
+
switch (def->iommu->model) {
case VIR_DOMAIN_IOMMU_MODEL_INTEL:
if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_INTEL_IOMMU)) {
@@ -7067,6 +7070,25 @@ qemuBuildMachineCommandLine(virCommandPtr cmd,
}
}
+ /* We don't report errors on missing cap here - -device code will do that */
+ if (def->iommu &&
+ virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_IOMMU)) {
+ switch (def->iommu->model) {
+ case VIR_DOMAIN_IOMMU_MODEL_INTEL:
+ if (!qemuDomainMachineIsQ35(def)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("IOMMU device: '%s' is only supported
with "
+ "Q35 machines"),
+
virDomainIOMMUModelTypeToString(def->iommu->model));
+ return -1;
+ }
+ virBufferAddLit(&buf, ",iommu=on");
+ break;
+ case VIR_DOMAIN_IOMMU_MODEL_LAST:
+ break;
+ }
+ }
+
virCommandAddArgBuffer(cmd, &buf);
}
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.args
b/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.args
new file mode 100644
index 0000000..9221b79
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.args
@@ -0,0 +1,21 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu \
+-name QEMUGuest1 \
+-S \
+-machine q35,accel=tcg,iommu=on \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-nographic \
+-nodefaults \
+-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \
+-no-acpi \
+-boot c \
+-device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e \
+-device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x0 \
+-device virtio-balloon-pci,id=balloon0,bus=pci.2,addr=0x1
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.xml
b/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.xml
new file mode 100644
index 0000000..b5b2b51
--- /dev/null
+++ b/tests/qemuxml2argvdata/qemuxml2argv-intel-iommu-machine.xml
@@ -0,0 +1,37 @@
+<domain type='qemu'>
+ <name>QEMUGuest1</name>
+ <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+ <memory unit='KiB'>219100</memory>
+ <currentMemory unit='KiB'>219100</currentMemory>
+ <vcpu placement='static'>1</vcpu>
+ <os>
+ <type arch='x86_64' machine='q35'>hvm</type>
+ <boot dev='hd'/>
+ </os>
+ <clock offset='utc'/>
+ <on_poweroff>destroy</on_poweroff>
+ <on_reboot>restart</on_reboot>
+ <on_crash>destroy</on_crash>
+ <devices>
+ <emulator>/usr/bin/qemu</emulator>
+ <controller type='pci' index='0' model='pcie-root'/>
+ <controller type='pci' index='1'
model='dmi-to-pci-bridge'>
+ <model name='i82801b11-bridge'/>
+ <address type='pci' domain='0x0000' bus='0x00'
slot='0x1e' function='0x0'/>
+ </controller>
+ <controller type='pci' index='2' model='pci-bridge'>
+ <model name='pci-bridge'/>
+ <target chassisNr='2'/>
+ <address type='pci' domain='0x0000' bus='0x01'
slot='0x00' function='0x0'/>
+ </controller>
+ <controller type='sata' index='0'>
+ <address type='pci' domain='0x0000' bus='0x00'
slot='0x1f' function='0x2'/>
+ </controller>
+ <input type='mouse' bus='ps2'/>
+ <input type='keyboard' bus='ps2'/>
+ <memballoon model='virtio'>
+ <address type='pci' domain='0x0000' bus='0x02'
slot='0x01' function='0x0'/>
+ </memballoon>
+ <iommu model='intel'/>
+ </devices>
+</domain>
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 39abe72..d5e21ac 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -2105,6 +2105,8 @@ mymain(void)
DO_TEST("acpi-table", NONE);
DO_TEST("intel-iommu", QEMU_CAPS_DEVICE_PCI_BRIDGE,
QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE, QEMU_CAPS_DEVICE_INTEL_IOMMU);
+ DO_TEST("intel-iommu-machine", QEMU_CAPS_DEVICE_PCI_BRIDGE,
QEMU_CAPS_MACHINE_OPT,
+ QEMU_CAPS_DEVICE_DMI_TO_PCI_BRIDGE, QEMU_CAPS_MACHINE_IOMMU);
DO_TEST("cpu-hotplug-startup", QEMU_CAPS_QUERY_HOTPLUGGABLE_CPUS);
--
2.7.4