Messages in this thread | | | Date | Wed, 21 Dec 2011 12:58:33 +0100 | From | Jan Kiszka <> | Subject | Re: [PATCH v2] KVM: x86: Prevent exposing TSC deadline timer feature in the absence of in-kernel APIC |
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On 2011-12-21 12:45, Avi Kivity wrote: > On 12/21/2011 01:28 PM, Jan Kiszka wrote: >>> >>> timer_mode_mask can just be slaved to the bit (as received by >>> KVM_SET_CPUID); that's exactly kvm_update_cpuid()'s role. >> >> Like > > Ugh, the facebook generation invades lkml.
I'm not on facebook. Does anyone sell shirts with that?
> >> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c >> index 230f713..89b02bf 100644 >> --- a/arch/x86/kvm/cpuid.c >> +++ b/arch/x86/kvm/cpuid.c >> @@ -27,7 +27,6 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu) >> { >> struct kvm_cpuid_entry2 *best; >> struct kvm_lapic *apic = vcpu->arch.apic; >> - u32 timer_mode_mask; >> >> best = kvm_find_cpuid_entry(vcpu, 1, 0); >> if (!best) >> @@ -40,15 +39,12 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu) >> best->ecx |= bit(X86_FEATURE_OSXSAVE); >> } >> >> - if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && >> - best->function == 0x1) { >> - best->ecx |= bit(X86_FEATURE_TSC_DEADLINE_TIMER); >> - timer_mode_mask = 3 << 17; >> - } else >> - timer_mode_mask = 1 << 17; >> - >> - if (apic) >> - apic->lapic_timer.timer_mode_mask = timer_mode_mask; >> + if (apic) { >> + if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER)) >> + apic->lapic_timer.timer_mode_mask = 3 << 17; >> + else >> + apic->lapic_timer.timer_mode_mask = 1 << 17; >> + } >> >> kvm_pmu_cpuid_update(vcpu); >> } >> >> >> + the KVM_CAP thing? >> > > +1
Ah, the adult crowd that trusts the other side.
OK, will see that I can cook up a proper patch later.
Jan
-- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux
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