KVM: x86: cleanup CR3 reserved bits checks

If not in long mode, the low bits of CR3 are reserved but not enforced to
be zero, so remove those checks.  If in long mode, however, the MBZ bits
extend down to the highest physical address bit of the guest, excluding
the encryption bit.

Make the checks consistent with the above, and match them between
nested_vmcb_checks and KVM_SET_SREGS.

Cc: stable@vger.kernel.org
Fixes: 761e4169 ("KVM: nSVM: Check that MBZ bits in CR3 and CR4 are not set on vmrun of nested guests")
Fixes: a780a3ea ("KVM: X86: Fix reserved bits check for MOV to CR3")
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/svm/nested.c

@@ -231,6 +231,7 @@ static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
 
 static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb12)
 {
+	struct kvm_vcpu *vcpu = &svm->vcpu;
 	bool vmcb12_lma;
 
 	if ((vmcb12->save.efer & EFER_SVME) == 0)
@@ -244,18 +245,10 @@ static bool nested_vmcb_checks(struct vcpu_svm *svm, struct vmcb *vmcb12)
 
 	vmcb12_lma = (vmcb12->save.efer & EFER_LME) && (vmcb12->save.cr0 & X86_CR0_PG);
 
-	if (!vmcb12_lma) {
-		if (vmcb12->save.cr4 & X86_CR4_PAE) {
-			if (vmcb12->save.cr3 & MSR_CR3_LEGACY_PAE_RESERVED_MASK)
-				return false;
-		} else {
-			if (vmcb12->save.cr3 & MSR_CR3_LEGACY_RESERVED_MASK)
-				return false;
-		}
-	} else {
+	if (vmcb12_lma) {
 		if (!(vmcb12->save.cr4 & X86_CR4_PAE) ||
 		    !(vmcb12->save.cr0 & X86_CR0_PE) ||
-		    (vmcb12->save.cr3 & MSR_CR3_LONG_MBZ_MASK))
+		    (vmcb12->save.cr3 & vcpu->arch.cr3_lm_rsvd_bits))
 			return false;
 	}
 	if (!kvm_is_valid_cr4(&svm->vcpu, vmcb12->save.cr4))

arch/x86/kvm/svm/svm.h

@@ -403,9 +403,6 @@ static inline bool gif_set(struct vcpu_svm *svm)
 }
 
 /* svm.c */
-#define MSR_CR3_LEGACY_RESERVED_MASK		0xfe7U
-#define MSR_CR3_LEGACY_PAE_RESERVED_MASK	0x7U
-#define MSR_CR3_LONG_MBZ_MASK			0xfff0000000000000U
 #define MSR_INVALID				0xffffffffU
 
 extern int sev;

arch/x86/kvm/x86.c

@@ -9624,6 +9624,8 @@ static bool kvm_is_valid_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
 		 */
 		if (!(sregs->cr4 & X86_CR4_PAE) || !(sregs->efer & EFER_LMA))
 			return false;
+		if (sregs->cr3 & vcpu->arch.cr3_lm_rsvd_bits)
+			return false;
 	} else {
 		/*
 		 * Not in 64-bit mode: EFER.LMA is clear and the code