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KVM: VMX: Move the comment of CR4.MCE handling right above the code

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Move the comment about keeping the hosts CR4.MCE loaded in hardware above
the code that actually modifies the hardware CR4 value.

No functional change indented.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20230410125017.1305238-3-xiaoyao.li@intel.com
[sean: elaborate in changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Xiaoyao Li 2023-04-10 08:50:17 -04:00 committed by Sean Christopherson
parent 334006b78c
commit 82dc11b82b
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/vmx/vmx.c
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@ -3389,13 +3389,13 @@ void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long old_cr4 = kvm_read_cr4(vcpu);
struct vcpu_vmx *vmx = to_vmx(vcpu);
unsigned long hw_cr4;
/*
* Pass through host's Machine Check Enable value to hw_cr4, which
* is in force while we are in guest mode. Do not let guests control
* this bit, even if host CR4.MCE == 0.
*/
unsigned long hw_cr4;
hw_cr4 = (cr4_read_shadow() & X86_CR4_MCE) | (cr4 & ~X86_CR4_MCE);
if (is_unrestricted_guest(vcpu))
hw_cr4 |= KVM_VM_CR4_ALWAYS_ON_UNRESTRICTED_GUEST;