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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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