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| author | Radim Krčmář <rkrcmar@redhat.com> | 2017-04-26 22:32:26 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-04-27 14:18:45 +0200 |
| commit | 178f02ffafafc59d4d4b135242e5cc1515743680 (patch) | |
| tree | 4e1addc5b8d3fffd2d14868c72c038d44488ea17 | |
| parent | KVM: add explicit barrier to kvm_vcpu_kick (diff) | |
| download | linux-178f02ffafafc59d4d4b135242e5cc1515743680.tar.xz linux-178f02ffafafc59d4d4b135242e5cc1515743680.zip | |
KVM: return if kvm_vcpu_wake_up() did wake up the VCPU
No need to kick a VCPU that we have just woken up.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | include/linux/kvm_host.h | 2 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 12 |
2 files changed, 9 insertions, 5 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 84c5396564f7..f4a2c00092f8 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -690,7 +690,7 @@ void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn); void kvm_vcpu_block(struct kvm_vcpu *vcpu); void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu); void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu); -void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu); +bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu); void kvm_vcpu_kick(struct kvm_vcpu *vcpu); int kvm_vcpu_yield_to(struct kvm_vcpu *target); void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 1efb07643035..632f7b3e198c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -183,8 +183,8 @@ bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) kvm_make_request(req, vcpu); cpu = vcpu->cpu; - if (!(req & KVM_REQUEST_NO_WAKEUP)) - kvm_vcpu_wake_up(vcpu); + if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) + continue; if (cpus != NULL && cpu != -1 && cpu != me && kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) @@ -2195,7 +2195,7 @@ out: } EXPORT_SYMBOL_GPL(kvm_vcpu_block); -void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) +bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) { struct swait_queue_head *wqp; @@ -2203,8 +2203,10 @@ void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) if (swait_active(wqp)) { swake_up(wqp); ++vcpu->stat.halt_wakeup; + return true; } + return false; } EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); @@ -2216,7 +2218,9 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu) int me; int cpu = vcpu->cpu; - kvm_vcpu_wake_up(vcpu); + if (kvm_vcpu_wake_up(vcpu)) + return; + me = get_cpu(); if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) if (kvm_arch_vcpu_should_kick(vcpu)) |