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| author | Longpeng(Mike) <longpeng2@huawei.com> | 2017-08-08 12:05:33 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-08-08 10:57:43 +0200 |
| commit | de63ad4cf4973462953c29c363f3cfa7117c2b2d (patch) | |
| tree | b269d3a1c04045d9f4f7005f8004f7da082bf0be /arch/x86/kvm/x86.c | |
| parent | 199b5763d329b43c88f6ad539db8a6c6b42f8edb (diff) | |
| download | lwn-de63ad4cf4973462953c29c363f3cfa7117c2b2d.tar.gz lwn-de63ad4cf4973462953c29c363f3cfa7117c2b2d.zip | |
KVM: X86: implement the logic for spinlock optimization
get_cpl requires vcpu_load, so we must cache the result (whether the
vcpu was preempted when its cpl=0) in kvm_vcpu_arch.
Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 6125e1743b69..69b72c9e1f12 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2873,6 +2873,10 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { int idx; + + if (vcpu->preempted) + vcpu->arch.preempted_in_kernel = !kvm_x86_ops->get_cpl(vcpu); + /* * Disable page faults because we're in atomic context here. * kvm_write_guest_offset_cached() would call might_fault() @@ -7985,6 +7989,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) kvm_pmu_init(vcpu); vcpu->arch.pending_external_vector = -1; + vcpu->arch.preempted_in_kernel = false; kvm_hv_vcpu_init(vcpu); @@ -8434,7 +8439,7 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) { - return false; + return vcpu->arch.preempted_in_kernel; } int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) |