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KVM: X86: Introduce kvm_vcpu_exit_request() helper

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Introduce kvm_vcpu_exit_request() helper, we need to check some conditions
before enter guest again immediately, we skip invoking the exit handler and
go through full run loop if complete fastpath but there is stuff preventing
we enter guest again immediately.

Tested-by: Haiwei Li <lihaiwei@tencent.com>
Cc: Haiwei Li <lihaiwei@tencent.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1588055009-12677-5-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li 2020-04-28 14:23:26 +08:00 committed by Paolo Bonzini
parent 2c4c413255
commit 5a9f54435a
2 changed files with 9 additions and 2 deletions
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10
arch/x86/kvm/x86.c
View File

@ -1573,6 +1573,13 @@ int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr);
bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu)
{
return vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu) ||
need_resched() || signal_pending(current);
}
EXPORT_SYMBOL_GPL(kvm_vcpu_exit_request);
/*
* The fast path for frequent and performance sensitive wrmsr emulation,
* i.e. the sending of IPI, sending IPI early in the VM-Exit flow reduces
@ -8396,8 +8403,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (kvm_lapic_enabled(vcpu) && vcpu->arch.apicv_active)
kvm_x86_ops.sync_pir_to_irr(vcpu);
if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu)
|| need_resched() || signal_pending(current)) {
if (kvm_vcpu_exit_request(vcpu)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
local_irq_enable();

1
arch/x86/kvm/x86.h
View File

@ -364,5 +364,6 @@ static inline bool kvm_dr7_valid(u64 data)
void kvm_load_guest_xsave_state(struct kvm_vcpu *vcpu);
void kvm_load_host_xsave_state(struct kvm_vcpu *vcpu);
u64 kvm_spec_ctrl_valid_bits(struct kvm_vcpu *vcpu);
bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu);
#endif