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KVM: x86: Keep MSR_IA32_XSS unchanged for INIT

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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: a554d207dc ("KVM: X86: Processor States following Reset or INIT")
Cc: stable@vger.kernel.org
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220126172226.2298529-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2022-01-26 17:22:24 +00:00 committed by Paolo Bonzini
parent 811f95ff95
commit be4f3b3f82
1 changed files with 1 additions and 2 deletions
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3
arch/x86/kvm/x86.c
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@ -11266,6 +11266,7 @@ 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. */
@ -11282,8 +11283,6 @@ 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);