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Commit 12f9a48f authored by Glauber Costa's avatar Glauber Costa Committed by Marcelo Tosatti
Browse files

KVM: x86: release kvmclock page on reset 



When a vcpu is reset, kvmclock page keeps being written to this days.
This is wrong and inconsistent: a cpu reset should take it to its
initial state.

Signed-off-by: default avatarGlauber Costa <glommer@redhat.com>
CC: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent f58c9df7

arch/x86/kvm/x86.c

+12 −8
Original line number Diff line number Diff line
@@ -1453,6 +1453,14 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) 
	return 0;

}



static void kvmclock_reset(struct kvm_vcpu *vcpu)

{

	if (vcpu->arch.time_page) {

		kvm_release_page_dirty(vcpu->arch.time_page);

		vcpu->arch.time_page = NULL;

	}

}



int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)

{

	switch (msr) {
@@ -1510,10 +1518,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) 
		break;

	case MSR_KVM_SYSTEM_TIME_NEW:

	case MSR_KVM_SYSTEM_TIME: {

		if (vcpu->arch.time_page) {

			kvm_release_page_dirty(vcpu->arch.time_page);

			vcpu->arch.time_page = NULL;

		}

		kvmclock_reset(vcpu);



		vcpu->arch.time = data;

		kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
@@ -5837,10 +5842,7 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) 


void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)

{

	if (vcpu->arch.time_page) {

		kvm_release_page_dirty(vcpu->arch.time_page);

		vcpu->arch.time_page = NULL;

	}

	kvmclock_reset(vcpu);



	free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);

	fx_free(vcpu);
@@ -5901,6 +5903,8 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) 
	kvm_make_request(KVM_REQ_EVENT, vcpu);

	vcpu->arch.apf.msr_val = 0;



	kvmclock_reset(vcpu);



	kvm_clear_async_pf_completion_queue(vcpu);

	kvm_async_pf_hash_reset(vcpu);

	vcpu->arch.apf.halted = false;