[PATCH v4 5/5] KVM: LAPIC: add advance timer support to pi_inject_timer

Wanpeng Li
2019-06-17T11:25:19Z

From: Wanpeng Li <wanpengli@tencent.com>

Wait before calling posted-interrupt deliver function directly to add
advance timer support to pi_inject_timer.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/lapic.c | 6 ++++--
arch/x86/kvm/lapic.h | 2 +-
arch/x86/kvm/svm.c | 2 +-
arch/x86/kvm/vmx/vmx.c | 2 +-
4 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 1a31389..1a31ba5 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1462,6 +1462,8 @@ static void apic_timer_expired(struct kvm_lapic *apic, bool can_pi_inject)
return;

if (can_pi_inject && posted_interrupt_inject_timer(apic->vcpu)) {
+ if (apic->lapic_timer.timer_advance_ns)
+ kvm_wait_lapic_expire(vcpu, true);
kvm_apic_inject_pending_timer_irqs(apic);
return;
}
@@ -1553,7 +1555,7 @@ static inline void adjust_lapic_timer_advance(struct kvm_vcpu *vcpu,
apic->lapic_timer.timer_advance_ns = timer_advance_ns;
}

-void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu)
+void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu, bool pi_inject)
{
struct kvm_lapic *apic = vcpu->arch.apic;
u64 guest_tsc, tsc_deadline;
@@ -1561,7 +1563,7 @@ void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu)
if (apic->lapic_timer.expired_tscdeadline == 0)
return;

- if (!lapic_timer_int_injected(vcpu))
+ if (!lapic_timer_int_injected(vcpu) && !pi_inject)
return;

tsc_deadline = apic->lapic_timer.expired_tscdeadline;
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index e41936b..3d8a043 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -225,7 +225,7 @@ static inline int kvm_lapic_latched_init(struct kvm_vcpu *vcpu)

bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);

-void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu);
+void kvm_wait_lapic_expire(struct kvm_vcpu *vcpu, bool pi_inject);

bool kvm_intr_is_single_vcpu_fast(struct kvm *kvm, struct kvm_lapic_irq *irq,
struct kvm_vcpu **dest_vcpu);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index bbc31f7..7e65de4 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5648,7 +5648,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu)

if (lapic_in_kernel(vcpu) &&
vcpu->arch.apic->lapic_timer.timer_advance_ns)
- kvm_wait_lapic_expire(vcpu);
+ kvm_wait_lapic_expire(vcpu, false);

/*
* If this vCPU has touched SPEC_CTRL, restore the guest's value if
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f45c51e..718a3ad 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6462,7 +6462,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)

if (lapic_in_kernel(vcpu) &&
vcpu->arch.apic->lapic_timer.timer_advance_ns)
- kvm_wait_lapic_expire(vcpu);
+ kvm_wait_lapic_expire(vcpu, false);

/*
* If this vCPU has touched SPEC_CTRL, restore the guest's value if
--
2.7.4