[libvirt] [PATCHv3 0/2] Fix snapshot-revert and managedsave with host-passthrough CPU mode
v1: https://www.redhat.com/archives/libvir-list/2014-October/msg01120.html v2: https://www.redhat.com/archives/libvir-list/2014-November/msg00218.html v3: * do not format the features at all, instead of adding a model to them Ján Tomko (2): Do not format CPU features without a model Ignore CPU features without a model for host-passthrough src/conf/cpu_conf.c | 7 ++- ...argv-cpu-host-passthrough-features-invalid.args | 22 +++++++++ ...2argv-cpu-host-passthrough-features-invalid.xml | 55 ++++++++++++++++++++++ tests/qemuxml2argvtest.c | 1 + 4 files changed, 84 insertions(+), 1 deletion(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.xml -- 2.0.4
For host-passthrough CPU we don't honor the CPU features specified in the XML, but we allow outputting them via the UPDATE_CPU flag for dumpxml, this gives user a rough idea of what features the CPU might have. After restoring a managedsave'd domain, the features might end up in the live status XML (in /var/run) without the model. This XML cannot be parsed by the daemon after restart and the domain might disappear. This fix skips formatting the features for HOST_PASSTHROUGH when UPDATE_CPU is not specified, so the newly restored domains and newly created snapshots won't be affected. Note: this doesn't fix existing snapshots or already restored running domains. https://bugzilla.redhat.com/show_bug.cgi?id=1030793 https://bugzilla.redhat.com/show_bug.cgi?id=1151885 --- src/conf/cpu_conf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c index 2650208..67203c6 100644 --- a/src/conf/cpu_conf.c +++ b/src/conf/cpu_conf.c @@ -658,7 +658,7 @@ virCPUDefFormatBuf(virBufferPtr buf, virBufferAddLit(buf, "/>\n"); } - for (i = 0; i < def->nfeatures; i++) { + for (i = 0; formatModel && i < def->nfeatures; i++) { virCPUFeatureDefPtr feature = def->features + i; if (!feature->name) { -- 2.0.4
This fixes reverting to snapshots created by older libvirt and allows libvirt not to lose track of a domain that has this in its live status XML (such as a domain restored from managedsave) https://bugzilla.redhat.com/show_bug.cgi?id=1030793 https://bugzilla.redhat.com/show_bug.cgi?id=1151885 --- src/conf/cpu_conf.c | 5 ++ ...argv-cpu-host-passthrough-features-invalid.args | 22 +++++++++ ...2argv-cpu-host-passthrough-features-invalid.xml | 55 ++++++++++++++++++++++ tests/qemuxml2argvtest.c | 1 + 4 files changed, 83 insertions(+) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.xml diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c index 67203c6..3af0f44 100644 --- a/src/conf/cpu_conf.c +++ b/src/conf/cpu_conf.c @@ -366,6 +366,11 @@ virCPUDefParseXML(xmlNodePtr node, goto error; if (n > 0) { + if (!def->model && def->mode == VIR_CPU_MODE_HOST_PASSTHROUGH) { + /* silently ignore incorrectly formatted features generated + * by older libvirt */ + goto cleanup; + } if (!def->model && def->mode != VIR_CPU_MODE_HOST_MODEL) { virReportError(VIR_ERR_XML_ERROR, "%s", _("Non-empty feature list specified without " diff --git a/tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.args b/tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.args new file mode 100644 index 0000000..18c1dce --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.args @@ -0,0 +1,22 @@ +LC_ALL=C \ +PATH=/bin \ +HOME=/home/test \ +USER=test \ +LOGNAME=test \ +QEMU_AUD\ +IO_DRV=none \ +/usr/bin/qemu \ +-S \ +-M pc \ +-cpu host \ +-m 214 \ +-smp 1 \ +-nographic \ +-monitor unix:/tmp/test-monitor,server,nowait \ +-no-acpi \ +-boot c \ +-usb \ +-hda /dev/HostVG/QEMUGuest1 \ +-net none \ +-serial none \ +-parallel none diff --git a/tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.xml b/tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.xml new file mode 100644 index 0000000..b5f5326 --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.xml @@ -0,0 +1,55 @@ +<domain type='kvm'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <title>A description of the test machine.</title> + <description> + A test of qemu's minimal configuration. + This test also tests the description and title elements. + </description> + <memory unit='KiB'>219100</memory> + <currentMemory unit='KiB'>219100</currentMemory> + <vcpu placement='static' cpuset='1-4,8-20,525'>1</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <cpu mode='host-passthrough'> + <feature policy='require' name='abm'/> + <feature policy='require' name='pdpe1gb'/> + <feature policy='require' name='rdrand'/> + <feature policy='require' name='f16c'/> + <feature policy='require' name='osxsave'/> + <feature policy='require' name='pdcm'/> + <feature policy='require' name='xtpr'/> + <feature policy='require' name='tm2'/> + <feature policy='require' name='est'/> + <feature policy='require' name='smx'/> + <feature policy='require' name='vmx'/> + <feature policy='require' name='ds_cpl'/> + <feature policy='require' name='monitor'/> + <feature policy='require' name='dtes64'/> + <feature policy='require' name='pbe'/> + <feature policy='require' name='tm'/> + <feature policy='require' name='ht'/> + <feature policy='require' name='ss'/> + <feature policy='require' name='acpi'/> + <feature policy='require' name='ds'/> + <feature policy='require' name='vme'/> + </cpu> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + <emulator>/usr/bin/qemu</emulator> + <disk type='block' device='disk'> + <source dev='/dev/HostVG/QEMUGuest1'/> + <target dev='hda' bus='ide'/> + <address type='drive' controller='0' bus='0' target='0' unit='0'/> + </disk> + <controller type='usb' index='0'/> + <controller type='ide' index='0'/> + <controller type='pci' index='0' model='pci-root'/> + <memballoon model='virtio'/> + </devices> +</domain> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c index c7b8ecf..9e39068 100644 --- a/tests/qemuxml2argvtest.c +++ b/tests/qemuxml2argvtest.c @@ -1523,6 +1523,7 @@ mymain(void) DO_TEST_FAILURE("shmem-small-size", QEMU_CAPS_PCIDEVICE, QEMU_CAPS_DEVICE, QEMU_CAPS_DEVICE_IVSHMEM); DO_TEST_PARSE_ERROR("shmem-msi-only", NONE); + DO_TEST("cpu-host-passthrough-features-invalid", QEMU_CAPS_KVM, QEMU_CAPS_CPU_HOST); virObjectUnref(driver.config); virObjectUnref(driver.caps); -- 2.0.4
On 05.12.2014 14:19, Ján Tomko wrote:
v1: https://www.redhat.com/archives/libvir-list/2014-October/msg01120.html v2: https://www.redhat.com/archives/libvir-list/2014-November/msg00218.html v3: * do not format the features at all, instead of adding a model to them
Ján Tomko (2): Do not format CPU features without a model Ignore CPU features without a model for host-passthrough
src/conf/cpu_conf.c | 7 ++- ...argv-cpu-host-passthrough-features-invalid.args | 22 +++++++++ ...2argv-cpu-host-passthrough-features-invalid.xml | 55 ++++++++++++++++++++++ tests/qemuxml2argvtest.c | 1 + 4 files changed, 84 insertions(+), 1 deletion(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.xml
ACK to both. Michal
On 12/10/2014 03:57 PM, Michal Privoznik wrote:
On 05.12.2014 14:19, Ján Tomko wrote:
v1: https://www.redhat.com/archives/libvir-list/2014-October/msg01120.html v2: https://www.redhat.com/archives/libvir-list/2014-November/msg00218.html v3: * do not format the features at all, instead of adding a model to them
Ján Tomko (2): Do not format CPU features without a model Ignore CPU features without a model for host-passthrough
src/conf/cpu_conf.c | 7 ++- ...argv-cpu-host-passthrough-features-invalid.args | 22 +++++++++ ...2argv-cpu-host-passthrough-features-invalid.xml | 55 ++++++++++++++++++++++ tests/qemuxml2argvtest.c | 1 + 4 files changed, 84 insertions(+), 1 deletion(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cpu-host-passthrough-features-invalid.xml
ACK to both.
Thanks, pushed. Jan
Michal
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