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[06/37] KVM: arm/arm64: Only load/put VCPU state for KVM_RUN

Message ID 20171012104141.26902-7-christoffer.dall@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Christoffer Dall Oct. 12, 2017, 10:41 a.m. UTC 
We only want to do things like invalidating TLBs or load timer state
onto the physical CPU if we really intend to run the VCPU, not if we are
simply retrieving some in-kernel value from userspace, for example.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
 virt/kvm/arm/arm.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 6e9513e..d495453 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -338,6 +338,9 @@  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 {
 	int *last_ran;
 
+	if (vcpu->ioctl != KVM_RUN)
+		return;
+
 	last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
 
 	/*
@@ -359,6 +362,9 @@  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 {
+	if (vcpu->ioctl != KVM_RUN)
+		return;
+
 	kvm_timer_vcpu_put(vcpu);
 	kvm_vgic_put(vcpu);