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Subject[PATCH 5.16 056/200] KVM: x86: Keep MSR_IA32_XSS unchanged for INIT
Date
From: Xiaoyao Li <xiaoyao.li@intel.com>

commit be4f3b3f82271c3193ce200a996dc70682c8e622 upstream.

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")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kvm/x86.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11065,6 +11065,7 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcp
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. */
@@ -11081,8 +11082,6 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcp
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);

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