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KVM: X86: implement the logic for spinlock optimization

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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>
This commit is contained in:
Longpeng(Mike) 2017-08-08 12:05:33 +08:00 committed by Paolo Bonzini
parent 199b5763d3
commit de63ad4cf4
5 changed files with 21 additions and 4 deletions
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3
arch/x86/include/asm/kvm_host.h
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@ -688,6 +688,9 @@ struct kvm_vcpu_arch {
/* GPA available (AMD only) */
bool gpa_available;
/* be preempted when it's in kernel-mode(cpl=0) */
bool preempted_in_kernel;
};
struct kvm_lpage_info {

2
arch/x86/kvm/hyperv.c
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@ -1274,7 +1274,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
switch (code) {
case HVCALL_NOTIFY_LONG_SPIN_WAIT:
kvm_vcpu_on_spin(vcpu, false);
kvm_vcpu_on_spin(vcpu, true);
break;
case HVCALL_POST_MESSAGE:
case HVCALL_SIGNAL_EVENT:

5
arch/x86/kvm/svm.c
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@ -3749,7 +3749,10 @@ static int interrupt_window_interception(struct vcpu_svm *svm)
static int pause_interception(struct vcpu_svm *svm)
{
kvm_vcpu_on_spin(&svm->vcpu, false);
struct kvm_vcpu *vcpu = &svm->vcpu;
bool in_kernel = (svm_get_cpl(vcpu) == 0);
kvm_vcpu_on_spin(vcpu, in_kernel);
return 1;
}

8
arch/x86/kvm/vmx.c
View File

@ -6781,7 +6781,13 @@ static int handle_pause(struct kvm_vcpu *vcpu)
if (ple_gap)
grow_ple_window(vcpu);
kvm_vcpu_on_spin(vcpu, false);
/*
* Intel sdm vol3 ch-25.1.3 says: The "PAUSE-loop exiting"
* VM-execution control is ignored if CPL > 0. OTOH, KVM
* never set PAUSE_EXITING and just set PLE if supported,
* so the vcpu must be CPL=0 if it gets a PAUSE exit.
*/
kvm_vcpu_on_spin(vcpu, true);
return kvm_skip_emulated_instruction(vcpu);
}

7
arch/x86/kvm/x86.c
View File

@ -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)