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[01/12] KVM: x86: Set so called 'reserved CR3 bits in LM mask' at vCPU reset

Message ID 20210204000117.3303214-2-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: Legal GPA fixes and cleanups | expand

Commit Message

Sean Christopherson Feb. 4, 2021, 12:01 a.m. UTC 
Set cr3_lm_rsvd_bits, which is effectively an invalid GPA mask, at vCPU
reset.  The reserved bits check needs to be done even if userspace never
configures the guest's CPUID model.

Cc: stable@vger.kernel.org
Fixes: 0107973a80ad ("KVM: x86: Introduce cr3_lm_rsvd_bits in kvm_vcpu_arch")
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/x86.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 667d0042d0b7..e6fbf2f574a6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10091,6 +10091,7 @@  int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	fx_init(vcpu);
 
 	vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
+	vcpu->arch.cr3_lm_rsvd_bits = rsvd_bits(cpuid_maxphyaddr(vcpu), 63);
 
 	vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;