The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From d28f4290b53a157191ed9991ad05dffe9e8c0c89 Mon Sep 17 00:00:00 2001
From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Date: Tue, 7 May 2019 09:06:27 -0700
Subject: [PATCH] KVM: VMX: Always signal #GP on WRMSR to MSR_IA32_CR_PAT with
bad value
The behavior of WRMSR is in no way dependent on whether or not KVM
consumes the value.
Fixes: 4566654bb9be9 ("KVM: vmx: Inject #GP on invalid PAT CR")
Cc: stable@xxxxxxxxxxxxxxx
Cc: Nadav Amit <nadav.amit@xxxxxxxxx>
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1a87a91e98dc..091610684d28 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1894,9 +1894,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
MSR_TYPE_W);
break;
case MSR_IA32_CR_PAT:
+ if (!kvm_pat_valid(data))
+ return 1;
+
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
- if (!kvm_pat_valid(data))
- return 1;
vmcs_write64(GUEST_IA32_PAT, data);
vcpu->arch.pat = data;
break;
