Commit 142e4be7 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

KVM: nVMX: Update vmcs12 for MSR_IA32_CR_PAT when it's written 



As alluded to by the TODO comment, KVM unconditionally intercepts writes
to the PAT MSR.  In the unlikely event that L1 allows L2 to write L1's
PAT directly but saves L2's PAT on VM-Exit, update vmcs12 when L2 writes
the PAT.  This eliminates the need to VMREAD the value from vmcs02 on
VM-Exit as vmcs12 is already up to date in all situations.

Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a49700b6

arch/x86/kvm/vmx/nested.c

+0 −4
Original line number Diff line number Diff line
@@ -3564,10 +3564,6 @@ static void sync_vmcs02_to_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) 
		vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);

	}



	/* TODO: These cannot have changed unless we have MSR bitmaps and

	 * the relevant bit asks not to trap the change */

	if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT)

		vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT);

	if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_EFER)

		vmcs12->guest_ia32_efer = vcpu->arch.efer;

	vmcs12->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS);

arch/x86/kvm/vmx/vmx.c

+4 −0
Original line number Diff line number Diff line
@@ -1910,6 +1910,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 
		if (!kvm_pat_valid(data))

			return 1;



		if (is_guest_mode(vcpu) &&

		    get_vmcs12(vcpu)->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT)

			get_vmcs12(vcpu)->guest_ia32_pat = data;



		if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {

			vmcs_write64(GUEST_IA32_PAT, data);

			vcpu->arch.pat = data;