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Subject[PATCH] release kvmclock page on reset
Date
Up to know, we were relying on guest cooperation to turn off kvmclock.
I just realized that even though this is fine and nice, a more robust
method is to (also) turn it off on vcpu_reset on the hypervisor side.
This will protect us against reboots, and we don't expect the guest
to reset its cpu during normal operation anyway.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
arch/x86/kvm/x86.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bcc0efc..38b55b3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5878,6 +5878,11 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
kvm_make_request(KVM_REQ_EVENT, vcpu);
vcpu->arch.apf.msr_val = 0;

+ if (vcpu->arch.time_page) {
+ kvm_release_page_dirty(vcpu->arch.time_page);
+ vcpu->arch.time_page = NULL;
+ }
+
kvm_clear_async_pf_completion_queue(vcpu);
kvm_async_pf_hash_reset(vcpu);
vcpu->arch.apf.halted = false;
--
1.7.2.3


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