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List: android-virt
Subject: [PATCH v2 7/9] KVM: arm/arm64: PMU: remove request-less vcpu kick
From: Andrew Jones <drjones () redhat ! com>
Date: 2017-03-31 16:06:56
Message-ID: 20170331160658.4331-8-drjones () redhat ! com
[Download RAW message or body]
Refactor PMU overflow handling in order to remove the request-less
vcpu kick. Now, since kvm_vgic_inject_irq() uses vcpu requests,
there should be no chance that a kick sent at just the wrong time
(between the VCPU's call to kvm_pmu_flush_hwstate() and before it
enters guest mode) results in a failure for the guest to see updated
GIC state until its next exit some time later for some other reason.
Signed-off-by: Andrew Jones <drjones@redhat.com>
---
virt/kvm/arm/pmu.c | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/virt/kvm/arm/pmu.c b/virt/kvm/arm/pmu.c
index 69ccce308458..9d725f3afb11 100644
--- a/virt/kvm/arm/pmu.c
+++ b/virt/kvm/arm/pmu.c
@@ -203,6 +203,19 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu)
return reg;
}
+static void kvm_pmu_check_overflow(struct kvm_vcpu *vcpu)
+{
+ struct kvm_pmu *pmu = &vcpu->arch.pmu;
+ bool overflow;
+
+ overflow = !!kvm_pmu_overflow_status(vcpu);
+ if (pmu->irq_level != overflow) {
+ pmu->irq_level = overflow;
+ kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
+ pmu->irq_num, overflow);
+ }
+}
+
/**
* kvm_pmu_overflow_set - set PMU overflow interrupt
* @vcpu: The vcpu pointer
@@ -210,31 +223,19 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu)
*/
void kvm_pmu_overflow_set(struct kvm_vcpu *vcpu, u64 val)
{
- u64 reg;
-
if (val == 0)
return;
vcpu_sys_reg(vcpu, PMOVSSET_EL0) |= val;
- reg = kvm_pmu_overflow_status(vcpu);
- if (reg != 0)
- kvm_vcpu_kick(vcpu);
+ kvm_pmu_check_overflow(vcpu);
}
static void kvm_pmu_update_state(struct kvm_vcpu *vcpu)
{
- struct kvm_pmu *pmu = &vcpu->arch.pmu;
- bool overflow;
-
if (!kvm_arm_pmu_v3_ready(vcpu))
return;
- overflow = !!kvm_pmu_overflow_status(vcpu);
- if (pmu->irq_level != overflow) {
- pmu->irq_level = overflow;
- kvm_vgic_inject_irq(vcpu->kvm, vcpu->vcpu_id,
- pmu->irq_num, overflow);
- }
+ kvm_pmu_check_overflow(vcpu);
}
/**
--
2.9.3
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