May 2020 - Devel - libvirt List Archives

Exposing -fw_cfg?
by Michal Privoznik 20 May '20

20 May '20

List, QEMU has capability to inject various blobs into firmware that configure how firmware configures itself. However, it can be also used to passthrough a specific file into the guest. For instance: -fw_cfg value=name=opt/com.example,file=/tmp/ign will make the /tmp/ign file accessible in the guest under: /sys/firmware/qemu_fw_cfg/by_name/opt/com.example/raw the @name is important here as it defines what knob is touched. For instance, /opt/ovmf tweaks OVMF, /bootorder changes the boot order, and so on. But, if the @name is in /opt/reverse.fully.qualified.domain form than this is a blob that is exposed into the guest and does not affect ACPI, SMBIOS, ... And IMO this is what makes the interface horrible. While I definitely would not expose the FW configuration knobs (we already provide a way to configure things like bootroder), the file passthrough is actually used. So far I have found out that RHCOS uses it to give the guest so called ignition file (for the sake of argument we can assume it's like a kickstart that the OS reads on the first boot and configures itself up), but there are some other potential users (for users it looks intriguing, it's a simple API that makes a file show up at well defined location inside the guest). Therefore I vouch for exposing the file passthorugh (and definitely do not mention firmware in the element or docs in any way, to not encourage users to use FW tweaking mode). However, before I design something, I'd like to hear your opinion. Michal

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[libvirt PATCH 0/6] Add ability to create mediated devices in libvirt
by Jonathon Jongsma 20 May '20

20 May '20

This is the first portion of an effort to support persistent mediated devices with libvirt. This first series simply enables creating and destroying non-persistent mediated devices via the virNodeDeviceCreateXML() and virNodeDeviceDestroy() functions. The 'mdevctl' utility[1] provides the backend implementation. [1] https://github.com/mdevctl/mdevctl Jonathon Jongsma (6): nodedev: factor out nodeDeviceHasCapability() nodedev: add support for mdev attributes nodedev: refactor nodeDeviceFindNewDevice() nodedev: store mdev UUID in mdev caps nodedev: add mdev support to virNodeDeviceCreateXML() nodedev: add mdev support to virNodeDeviceDestroy() docs/schemas/nodedev.rng | 6 + libvirt.spec.in | 3 + m4/virt-external-programs.m4 | 3 + src/conf/node_device_conf.c | 59 ++++- src/conf/node_device_conf.h | 3 + src/conf/virnodedeviceobj.c | 34 +++ src/conf/virnodedeviceobj.h | 3 + src/libvirt_private.syms | 3 + src/node_device/node_device_driver.c | 326 ++++++++++++++++++++++++--- src/node_device/node_device_udev.c | 5 +- src/util/virmdev.c | 12 + src/util/virmdev.h | 11 + 12 files changed, 425 insertions(+), 43 deletions(-) -- 2.21.1

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[PATCH trivial v2 1/1] logging.html.in: fix number of output formats available
by Daniel Henrique Barboza 20 May '20

20 May '20

There are 4 formats available (x:stderr, x:syslog:name, x:file:file_path, x:journald), not 3. Use "the following" instead of the actual number to avoid the need to update the number every time a new form is added/removed. Suggested-by: Pino Toscano <ptoscano(a)redhat.com> Signed-off-by: Daniel Henrique Barboza <danielhb413(a)gmail.com> --- docs/logging.html.in | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/logging.html.in b/docs/logging.html.in index 65c13e8a19..3ff0dd3eb6 100644 --- a/docs/logging.html.in +++ b/docs/logging.html.in @@ -124,7 +124,7 @@ x:name</pre> priority level, messages that match that filter will still be logged, while others will not. In order to see those messages, you must also have an output defined that includes the priority level of your filter. - The format for an output can be one of those 3 forms: + The format for an output can be one of the following forms: <ul> <li><code>x:stderr</code> output goes to stderr</li> <li><code>x:syslog:name</code> use syslog for the output and use the -- 2.26.2

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[PATCH 0/3] qemu: Emit an event on lease attach/detach
by Michal Privoznik 20 May '20

20 May '20

*** BLURB HERE *** Michal Prívozník (3): qemuDomainAttachDeviceLive: Rework event emitting Introduce VIR_DOMAIN_EVENT_ID_LEASE_CHANGE qemu: Emit an event on lease attach/detach examples/c/misc/event-test.c | 37 ++++++++++ include/libvirt/libvirt-domain.h | 37 ++++++++++ src/conf/domain_event.c | 100 ++++++++++++++++++++++++++++ src/conf/domain_event.h | 16 +++++ src/libvirt_private.syms | 2 + src/qemu/qemu_driver.c | 45 +++++++------ src/qemu/qemu_hotplug.c | 9 +++ src/remote/remote_daemon_dispatch.c | 37 ++++++++++ src/remote/remote_driver.c | 34 ++++++++++ src/remote/remote_protocol.x | 18 ++++- src/remote_protocol-structs | 8 +++ tools/virsh-domain.c | 34 ++++++++++ 12 files changed, 355 insertions(+), 22 deletions(-) -- 2.26.2

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[PATCH trivial 1/1] logging.html.in: fix number of output formats available
by Daniel Henrique Barboza 19 May '20

19 May '20

There are 4 formats available (x:stderr, x:syslog:name, x:file:file_path, x:journald), not 3. Signed-off-by: Daniel Henrique Barboza <danielhb413(a)gmail.com> --- docs/logging.html.in | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/logging.html.in b/docs/logging.html.in index 65c13e8a19..9f320b439e 100644 --- a/docs/logging.html.in +++ b/docs/logging.html.in @@ -124,7 +124,7 @@ x:name</pre> priority level, messages that match that filter will still be logged, while others will not. In order to see those messages, you must also have an output defined that includes the priority level of your filter. - The format for an output can be one of those 3 forms: + The format for an output can be one of those 4 forms: <ul> <li><code>x:stderr</code> output goes to stderr</li> <li><code>x:syslog:name</code> use syslog for the output and use the -- 2.26.2

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Re: Question: How do I discard any changes for the device which is set by blockdev option?
by Eric Blake 19 May '20

19 May '20

On 5/19/20 12:56 PM, Masayoshi Mizuma wrote: > Hello, > > I would like to discard any changes while the qemu guest OS is done. > I can do that with snapshot and drive option. > However, snapshot option doesn't work for the device which set by > blockdev option like as: > > $QEMU --enable-kvm \ > -m 1024 \ > -nographic \ > -serial mon:stdio \ > -blockdev driver=file,node-name=mydisk,filename=/mnt/fedora.qcow2 \ > -blockdev driver=qcow2,node-name=vda,file=mydisk \ > -device virtio-blk-pci,drive=vda,bootindex=1 \ > -snapshot > > I would like to use blockdev option to set the device because > libvirt uses blockdev option for disk element. > > If there's no way to do so, does that make sense to get available > snapshot option to blockdev as well? If that makes sense, I'll try to > implement that. > > As for qcow2, I think we can do such things to use qemu-img snapshot > command, for example save the original image and restore the image > after the qemu guest OS is shutdowned. However, it may be complecated > for user. I would like the simple way like as snapshot/drive option... > > If I'm missing something, let me know. > Sounds like a repeat of this thread: https://lists.gnu.org/archive/html/qemu-devel/2020-01/msg06144.html where the consensus is yes, -blockdev and -snapshot are incompatible, libvirt has plans to use the <transient/> tag to behave the same as what -snapshot does (but no one has implemented it yet), and in the meantime, it is possible to force libvirt to avoid -blockdev if you still need to supply -snapshot behind libvirt's back. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org

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[PATCH 00/15] tests: qemu: Detect deprecation in the QMP schema (deprecation part 1)
by Peter Krempa 19 May '20

19 May '20

Recent qemu versions started adding the 'deprecated' feature to commands and fields. Use this data to validate that our code doesn't rely on deprecated commands. It turns out that we still use some old migration commands (See 14/15) and add validator to catch anything deprecated early. Peter Krempa (15): testQemuHotplugCpuPrepare: Allow unused monitor commands only on failure testutilsqemuschema: Introduce testQEMUSchemaValidateCommand qemuMonitorTestProcessCommandDefaultValidate: Use testQEMUSchemaValidateCommand qemuMonitorTestProcessCommandDefaultValidate: Clean up return value use qemumonitortestutils: Introduce qemuMonitorTestSkipDeprecatedValidation testutilsqemuschema: Use automatic variable clearing where possible testutilsqemuschema: Pass in 'schema' and 'debug' variables to workers in a struct testQEMUSchemaValidate(Command): Allow skipping validation of deprecated fields testQemuHotplugCpuPrepare: Allow deprecated commands for non-modern cpu hotplug test qemumonitorjsontest: Add infrastructure for generated tests of deprecated commands testQemuMonitorJSONqemuMonitorJSONQueryCPUs: Split off test for query-cpus-fast qemumonitorjsontest: Allow use of deprecated 'query-cpus' qemumonitorjsontest: Allow use of deprecated 'cpu-add' and 'change' command qemumonitorjsontest: Mark recently deprecated migration command in our tests testQEMUSchemaValidate*: Reject usage of fields with 'deprecated' set tests/qemublocktest.c | 14 +- tests/qemuhotplugtest.c | 11 +- tests/qemumonitorjsontest.c | 67 +++++-- tests/qemumonitortestutils.c | 66 ++++--- tests/qemumonitortestutils.h | 2 + tests/testutilsqemuschema.c | 334 ++++++++++++++++++++++------------- tests/testutilsqemuschema.h | 9 + 7 files changed, 325 insertions(+), 178 deletions(-) -- 2.26.2

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[PATCH] qemu: do not allow /dev/rtc or /dev/hpet access via the devices cgroup
by Paolo Bonzini 19 May '20

19 May '20

The RTC and HPET modes for the QEMU emulation tick have been dropped almost 9 years ago, in commit 25f3151ece1d5881826232bebccc21b588d4e03e. Do not allow them in the devices cgroup policy. Signed-off-by: Paolo Bonzini <pbonzini(a)redhat.com> --- docs/drvqemu.html.in | 1 - src/qemu/qemu.conf | 1 - src/qemu/qemu_cgroup.c | 1 - src/qemu/test_libvirtd_qemu.aug.in | 2 -- 4 files changed, 5 deletions(-) diff --git a/docs/drvqemu.html.in b/docs/drvqemu.html.in index afc4ddf56d..b6d731bb59 100644 --- a/docs/drvqemu.html.in +++ b/docs/drvqemu.html.in @@ -484,7 +484,6 @@ chmod o+x /path/to/directory /dev/null, /dev/full, /dev/zero, /dev/random, /dev/urandom, /dev/ptmx, /dev/kvm, -/dev/rtc, /dev/hpet </pre> diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf index abdbf07fec..d7a3f40e78 100644 --- a/src/qemu/qemu.conf +++ b/src/qemu/qemu.conf @@ -495,7 +495,6 @@ # "/dev/null", "/dev/full", "/dev/zero", # "/dev/random", "/dev/urandom", # "/dev/ptmx", "/dev/kvm", -# "/dev/rtc","/dev/hpet" #] # # RDMA migration requires the following extra files to be added to the list: diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c index 2e019b64af..d92202f847 100644 --- a/src/qemu/qemu_cgroup.c +++ b/src/qemu/qemu_cgroup.c @@ -47,7 +47,6 @@ const char *const defaultDeviceACL[] = { "/dev/null", "/dev/full", "/dev/zero", "/dev/random", "/dev/urandom", "/dev/ptmx", "/dev/kvm", - "/dev/rtc", "/dev/hpet", NULL, }; #define DEVICE_PTY_MAJOR 136 diff --git a/src/qemu/test_libvirtd_qemu.aug.in b/src/qemu/test_libvirtd_qemu.aug.in index 19da591aae..e533b9f551 100644 --- a/src/qemu/test_libvirtd_qemu.aug.in +++ b/src/qemu/test_libvirtd_qemu.aug.in @@ -61,8 +61,6 @@ module Test_libvirtd_qemu = { "5" = "/dev/urandom" } { "6" = "/dev/ptmx" } { "7" = "/dev/kvm" } - { "8" = "/dev/rtc" } - { "9" = "/dev/hpet" } } { "save_image_format" = "raw" } { "dump_image_format" = "raw" } -- 2.25.4

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[PATCH v2] README.rst: Replace the installation instructions with link to compiling.html.
by Yi Wang 19 May '20

19 May '20

From: Liao Pingfang <liao.pingfang(a)zte.com.cn> Remove the installation instructions from README.rst, and add the link to compiling.html. Signed-off-by: Liao Pingfang <liao.pingfang(a)zte.com.cn> --- Changes in v2: use compiling.html replace the installation instructions README.rst | 26 ++------------------------ 1 file changed, 2 insertions(+), 24 deletions(-) diff --git a/README.rst b/README.rst index cdcc97b..5d6ca55 100644 --- a/README.rst +++ b/README.rst @@ -45,31 +45,9 @@ and ``COPYING`` for full license terms & conditions. Installation ============ -Libvirt uses the GNU Autotools build system, so in general can be built -and installed with the usual commands, however, we mandate to have the -build directory different than the source directory. For example, to build -in a manner that is suitable for installing as root, use: - -:: - - $ mkdir build && cd build - $ ../configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var - $ make - $ sudo make install - -While to build & install as an unprivileged user - -:: - - $ mkdir build && cd build - $ ../configure --prefix=$HOME/usr - $ make - $ make install - -The libvirt code relies on a large number of 3rd party libraries. These will -be detected during execution of the ``configure`` script and a summary printed -which lists any missing (optional) dependencies. +Instructions on building and installing libvirt can be found on the website: +https://libvirt.org/compiling.html Contributing ============ -- 2.9.5

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[libvirt PATCH] qemu: conf: fix stray comma
by Ján Tomko 19 May '20

19 May '20

The qemu.conf change broke our augeas test: qemu/test_libvirtd_qemu.aug:96.3-203.1:exception thrown in test qemu/test_libvirtd_qemu.aug:96.8-.34:exception: Iterated lens matched less than it should Lens: ../../src/qemu/libvirtd_qemu.aug:170.13-.43: Last match: ../../src/qemu/libvirtd_qemu.aug:18.52-.113: Not matching: ../../src/qemu/libvirtd_qemu.aug:12.19-.31: Error encountered at 48:27 (1615 characters into string) <\n "/dev/ptmx", "/dev/kvm"|=|,\n]\nsave_image_format = "raw> Fixes: ab5ba57012e9e6ab4f55afdeecd1813dd3ca916b Signed-off-by: Ján Tomko <jtomko(a)redhat.com> --- Pushed as a trivial build fix src/qemu/qemu.conf | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf index d7a3f40e78..404961c53e 100644 --- a/src/qemu/qemu.conf +++ b/src/qemu/qemu.conf @@ -494,7 +494,7 @@ #cgroup_device_acl = [ # "/dev/null", "/dev/full", "/dev/zero", # "/dev/random", "/dev/urandom", -# "/dev/ptmx", "/dev/kvm", +# "/dev/ptmx", "/dev/kvm" #] # # RDMA migration requires the following extra files to be added to the list: -- 2.25.4

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