[PATCH] release kvmclock page on reset

From: Glauber Costa
Date: Fri Jan 28 2011 - 14:49:31 EST

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@xxxxxxxxxx>
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;
+ }
vcpu->arch.apf.halted = false;

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