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KVM: LAPIC: Narrow down the kick target vCPU

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The kick after setting KVM_REQ_PENDING_TIMER is used to handle the timer
fires on a different pCPU which vCPU is running on.  This kick costs about
1000 clock cycles and we don't need this when injecting already-expired
timer or when using the VMX preemption timer because
kvm_lapic_expired_hv_timer() is called from the target vCPU.

Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1599731444-3525-6-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li
2020-09-10 17:50:40 +08:00
committed by Paolo Bonzini
parent 275038332f
commit 68ca7663c7
3 changed files with 3 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kvm/lapic.c
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@@ -1642,7 +1642,9 @@ static void apic_timer_expired(struct kvm_lapic *apic, bool from_timer_fn)
} }
atomic_inc(&apic->lapic_timer.pending); atomic_inc(&apic->lapic_timer.pending);
kvm_set_pending_timer(vcpu); kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
if (from_timer_fn)
kvm_vcpu_kick(vcpu);
} }
static void start_sw_tscdeadline(struct kvm_lapic *apic) static void start_sw_tscdeadline(struct kvm_lapic *apic)

6
arch/x86/kvm/x86.c
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@@ -1774,12 +1774,6 @@ static s64 get_kvmclock_base_ns(void)
} }
#endif #endif
void kvm_set_pending_timer(struct kvm_vcpu *vcpu)
{
kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
kvm_vcpu_kick(vcpu);
}
static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
{ {
int version; int version;

1
arch/x86/kvm/x86.h
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@@ -246,7 +246,6 @@ static inline bool kvm_vcpu_latch_init(struct kvm_vcpu *vcpu)
return is_smm(vcpu) || kvm_x86_ops.apic_init_signal_blocked(vcpu); return is_smm(vcpu) || kvm_x86_ops.apic_init_signal_blocked(vcpu);
} }
void kvm_set_pending_timer(struct kvm_vcpu *vcpu);
void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip); void kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr); void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr);