File 2900575d-qemu-no-define-noop-features.patch of Package libvirt.16761
commit 2900575db892700fab8a4b8541474d9bd3444a4a
Author: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Date: Thu Apr 25 11:04:29 2019 +0200
qemu: do not define known no-op features
Qemu dropped cpu features for osxsave and ospke [1][2].
The reason for the instant removal is that those features were never
configurable as discussed in [3].
Fortunately the use cases adding those flags in the past are rare, but
they exist. One that I identified are e.g. older virt-install when used
with --cpu=host-model and there always could be the case of a user
adding it to the guest xml.
This triggers an issue like:
qemu-system-x86_64: can't apply global Broadwell-noTSX-x86_64-
cpu.osxsave=on: Property '.osxsave' not found
Ensure that this does no more break spawning newer qemu versions by
not rendering those features into the qemu command line.
Fixes: https://bugs.launchpad.net/fedora/+source/qemu/+bug/1825195
Resolves: https://bugzilla.redhat.com/1644848
[1]: https://git.qemu.org/?p=qemu.git;a=commit;h=f1a2352
[2]: https://git.qemu.org/?p=qemu.git;a=commit;h=9ccb978
[3]: https://www.mail-archive.com/qemu-devel@nongnu.org/msg561877.html
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Tested-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Index: libvirt-5.1.0/src/qemu/qemu_command.c
===================================================================
--- libvirt-5.1.0.orig/src/qemu/qemu_command.c
+++ libvirt-5.1.0/src/qemu/qemu_command.c
@@ -6925,6 +6925,27 @@ qemuBuildGlobalControllerCommandLine(vir
return 0;
}
+/**
+ * qemuFeatureNoEffect:
+ * @feature: CPU Feature
+ *
+ * Returns true, if the feature is known to have (never had) an effect on QEMU.
+ * Those features might be dropped in qemu without a longer deprecation cycle
+ * and must therefore be known e.g. to no more define them on command line.
+ */
+static bool
+qemuFeatureNoEffect(virCPUFeatureDefPtr feature)
+{
+ if (!feature->name)
+ return false;
+
+ if (STREQ(feature->name, "osxsave"))
+ return true;
+ if (STREQ(feature->name, "ospke"))
+ return true;
+
+ return false;
+}
static int
qemuBuildCpuModelArgStr(virQEMUDriverPtr driver,
@@ -6993,6 +7014,8 @@ qemuBuildCpuModelArgStr(virQEMUDriverPtr
virBufferAsprintf(buf, ",vendor=%s", cpu->vendor_id);
for (i = 0; i < cpu->nfeatures; i++) {
+ if (qemuFeatureNoEffect(&(cpu->features[i])))
+ continue;
switch ((virCPUFeaturePolicy) cpu->features[i].policy) {
case VIR_CPU_FEATURE_FORCE:
case VIR_CPU_FEATURE_REQUIRE:
Index: libvirt-5.1.0/tests/qemuxml2argvdata/cpu-host-model-cmt.args
===================================================================
--- libvirt-5.1.0.orig/tests/qemuxml2argvdata/cpu-host-model-cmt.args
+++ libvirt-5.1.0/tests/qemuxml2argvdata/cpu-host-model-cmt.args
@@ -9,7 +9,7 @@ QEMU_AUDIO_DRV=none \
-S \
-machine pc,accel=tcg,usb=off,dump-guest-core=off \
-cpu Haswell,+vme,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monitor,+ds_cpl,+vmx,\
-+smx,+est,+tm2,+xtpr,+pdcm,+osxsave,+f16c,+rdrand,+pdpe1gb,+abm,+lahf_lm \
++smx,+est,+tm2,+xtpr,+pdcm,+f16c,+rdrand,+pdpe1gb,+abm,+lahf_lm \
-m 214 \
-smp 6,sockets=6,cores=1,threads=1 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
Index: libvirt-5.1.0/tests/qemuxml2argvdata/cpu-tsc-frequency.args
===================================================================
--- libvirt-5.1.0.orig/tests/qemuxml2argvdata/cpu-tsc-frequency.args
+++ libvirt-5.1.0/tests/qemuxml2argvdata/cpu-tsc-frequency.args
@@ -9,8 +9,8 @@ QEMU_AUDIO_DRV=none \
-S \
-machine pc,accel=kvm,usb=off,dump-guest-core=off \
-cpu Haswell,+vme,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monitor,+ds_cpl,+vmx,\
-+smx,+est,+tm2,+xtpr,+pdcm,+osxsave,+f16c,+rdrand,+pdpe1gb,+abm,+lahf_lm,\
-+invtsc,tsc-frequency=3504000000 \
++smx,+est,+tm2,+xtpr,+pdcm,+f16c,+rdrand,+pdpe1gb,+abm,+lahf_lm,+invtsc,\
+tsc-frequency=3504000000 \
-m 214 \
-smp 1,sockets=1,cores=1,threads=1 \
-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
