Re: [PATCH 1/2] KVM: VMX: Use kvm_read_cr4() to get cr4 value

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On 4/11/2023 1:11 AM, Sean Christopherson wrote:
On Mon, Apr 10, 2023, Xiaoyao Li wrote:
Directly use vcpu->arch.cr4 is not recommended since it gets stale value
if the cr4 is not available.

Use kvm_read_cr4() instead to ensure correct value.

Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
  arch/x86/kvm/vmx/vmx.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index d7bf14abdba1..befa2486836b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3431,7 +3431,7 @@ static bool vmx_is_valid_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
  {
-	unsigned long old_cr4 = vcpu->arch.cr4;
+	unsigned long old_cr4 = kvm_read_cr4(vcpu);

Ha!  I've been tempted to change this multiple times, but always thought I was
just being a bit obsessive :-)

Patches look good, but I'm going to hold them for 6.5 just in case this somehow
causes a problem, e.g. if there's a bizzaro nested path that "works" because KVM
_doesn't_ decache info from the current VMCS.

so you will put it in kvm-next after 6.4 merge windows?



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