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kvm: Allow invtsc migration if tsc-khz is set explicitly

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We can safely allow a VM to be migrated with invtsc enabled if
tsc-khz is set explicitly, because:
* QEMU already refuses to start if it can't set the TSC frequency
  to the configured value.
* Management software is already required to keep device
  configuration (including CPU configuration) the same on
  migration source and destination.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170108173234.25721-3-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2017-01-08 15:32:34 -02:00
parent d74460ec1b
commit d99569d9d8
1 changed files with 11 additions and 9 deletions
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20
target/i386/kvm.c
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@ -963,15 +963,17 @@ int kvm_arch_init_vcpu(CPUState *cs)
has_msr_mcg_ext_ctl = has_msr_feature_control = true;
}
if ((env->features[FEAT_8000_0007_EDX] & CPUID_APM_INVTSC) &&
invtsc_mig_blocker == NULL) {
/* for migration */
error_setg(&invtsc_mig_blocker,
"State blocked by non-migratable CPU device"
" (invtsc flag)");
migrate_add_blocker(invtsc_mig_blocker);
/* for savevm */
vmstate_x86_cpu.unmigratable = 1;
if (!env->user_tsc_khz) {
if ((env->features[FEAT_8000_0007_EDX] & CPUID_APM_INVTSC) &&
invtsc_mig_blocker == NULL) {
/* for migration */
error_setg(&invtsc_mig_blocker,
"State blocked by non-migratable CPU device"
" (invtsc flag)");
migrate_add_blocker(invtsc_mig_blocker);
/* for savevm */
vmstate_x86_cpu.unmigratable = 1;
}
}
cpuid_data.cpuid.padding = 0;