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KVM: x86: introduce kvm_can_use_hv_timer

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Replace the ad hoc test in vmx_set_hv_timer with a test in the caller,
start_hv_timer.  This test is not Intel-specific and would be duplicated
when introducing the fast path for the TSC deadline MSR.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2020-05-05 06:45:35 -04:00
parent 379a3c8ee4
commit 199a8b84c4
3 changed files with 11 additions and 8 deletions
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13
arch/x86/kvm/lapic.c
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@@ -110,11 +110,18 @@ static inline u32 kvm_x2apic_id(struct kvm_lapic *apic)
return apic->vcpu->vcpu_id;
}
bool kvm_can_post_timer_interrupt(struct kvm_vcpu *vcpu)
static bool kvm_can_post_timer_interrupt(struct kvm_vcpu *vcpu)
{
return pi_inject_timer && kvm_vcpu_apicv_active(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_can_post_timer_interrupt);
bool kvm_can_use_hv_timer(struct kvm_vcpu *vcpu)
{
return kvm_x86_ops.set_hv_timer
&& !(kvm_mwait_in_guest(vcpu->kvm) ||
kvm_can_post_timer_interrupt(vcpu));
}
EXPORT_SYMBOL_GPL(kvm_can_use_hv_timer);
static bool kvm_use_posted_timer_interrupt(struct kvm_vcpu *vcpu)
{
@@ -1788,7 +1795,7 @@ static bool start_hv_timer(struct kvm_lapic *apic)
bool expired;
WARN_ON(preemptible());
if (!kvm_x86_ops.set_hv_timer)
if (!kvm_can_use_hv_timer(vcpu))
return false;
if (!ktimer->tscdeadline)