We must not report the TSC deadline timer feature on our own when user
space provides the APIC as we have no clue about its features.
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
Changes in v2:
- reorganized code to make the flow clearer
arch/x86/kvm/cpuid.c | 18 ++++++++----------
1 files changed, 8 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 230f713..b7cdd3b 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 +39,14 @@ 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 (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+ best->function == 0x1) {
+ 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);
}
--
1.7.3.4
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