nVMX: Keep arch.pat in sync on L1-L2 switches

When asking vmx to load the PAT MSR for us while switching from L1 to L2
or vice versa, we have to update arch.pat as well as it may later be
used again to load or read out the MSR content.

Reviewed-by: Gleb Natapov <gleb@redhat.com>
Tested-by: Arthur Chunqi Li <yzt356@gmail.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5b6f2a86826b..6d53dc33c0b0 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7694,9 +7694,10 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
                         ~VM_ENTRY_IA32E_MODE) |
                 (vmcs_config.vmentry_ctrl & ~VM_ENTRY_IA32E_MODE));
 
-        if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT)
+        if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT) {
                 vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat);
-        else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
+                vcpu->arch.pat = vmcs12->guest_ia32_pat;
+        } else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
                 vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat);
 
 
@@ -8217,8 +8218,10 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
         vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base);
         vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base);
 
-        if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT)
+        if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) {
                 vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat);
+                vcpu->arch.pat = vmcs12->host_ia32_pat;
+        }
         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
                 vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL,
                         vmcs12->host_ia32_perf_global_ctrl);