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SubjectRe: [PATCH] KVM: x86: Keep MSR_IA32_XSS unchanged for INIT
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On 1/26/22 04:47, Xiaoyao Li wrote:
> It has been corrected from SDM version 075 that MSR_IA32_XSS is reset to
> zero on Power up and Reset but keeps unchanged on INIT.
>
> Fixes: a554d207dc46 ("KVM: X86: Processor States following Reset or INIT")
> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
> ---
> arch/x86/kvm/x86.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 55518b7d3b96..c0727939684e 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -11257,6 +11257,7 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
> vcpu->arch.msr_misc_features_enables = 0;
>
> vcpu->arch.xcr0 = XFEATURE_MASK_FP;
> + vcpu->arch.ia32_xss = 0;
> }
>
> /* All GPRs except RDX (handled below) are zeroed on RESET/INIT. */
> @@ -11273,8 +11274,6 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
> cpuid_0x1 = kvm_find_cpuid_entry(vcpu, 1, 0);
> kvm_rdx_write(vcpu, cpuid_0x1 ? cpuid_0x1->eax : 0x600);
>
> - vcpu->arch.ia32_xss = 0;
> -
> static_call(kvm_x86_vcpu_reset)(vcpu, init_event);
>
> kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);

Queued, thanks.

Paolo

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