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SubjectRe: [PATCH 2/2] x86: kvm: do not advertise stable clocksource if CPU has TSC drift BUG
Il 31/07/2014 11:47, Igor Mammedov ha scritto:
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
> arch/x86/kvm/cpuid.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 38a0afe..f519823 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -478,8 +478,9 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
> (1 << KVM_FEATURE_CLOCKSOURCE2) |
> (1 << KVM_FEATURE_ASYNC_PF) |
> (1 << KVM_FEATURE_PV_EOI) |
> - (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT) |
> (1 << KVM_FEATURE_PV_UNHALT);
> + if (!static_cpu_has_bug(X86_BUG_AMD_TSC_DRIFT))
> + entry->eax |= (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
>
> if (sched_info_on())
> entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
>

Marcelo, is there anything we can do if the VM migrates from a sane host
to a buggy one?

Paolo


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