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| author | Wanpeng Li <wanpengli@tencent.com> | 2020-09-10 17:50:40 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-09-28 07:57:09 -0400 |
| commit | 68ca7663c75b099539fe675fc5387dee44d3a6cc (patch) | |
| tree | ebc0821cfc5dd0438fc83e7c2803c1e487d8c0b8 /arch/x86 | |
| parent | 275038332f22d15796f1921f672b024d5cb392bc (diff) | |
| download | linux-68ca7663c75b099539fe675fc5387dee44d3a6cc.tar.bz2 | |
KVM: LAPIC: Narrow down the kick target vCPU
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/lapic.c | 4 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 6 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.h | 1 |
3 files changed, 3 insertions, 8 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index e446bdff70ec..3b32d3b094b5 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1642,7 +1642,9 @@ static void apic_timer_expired(struct kvm_lapic *apic, bool from_timer_fn) } 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) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1994602a0851..836baad47fe9 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1774,12 +1774,6 @@ static s64 get_kvmclock_base_ns(void) } #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) { int version; diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 995ab696dcf0..ea20b8bfd5dc 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -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); } -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_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr); |