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kvm: nVMX: Validate CR3 target count on nested VM-entry
According to the SDM, the CR3-target count must not be greater than 4. Future processors may support a different number of CR3-target values. Software should read the VMX capability MSR IA32_VMX_MISC to determine the number of values supported. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -1314,6 +1314,11 @@ static inline bool report_flexpriority(void)
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return flexpriority_enabled;
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}
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static inline unsigned nested_cpu_vmx_misc_cr3_count(struct kvm_vcpu *vcpu)
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{
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return vmx_misc_cr3_count(to_vmx(vcpu)->nested.nested_vmx_misc_low);
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}
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static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit)
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{
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return vmcs12->cpu_based_vm_exec_control & bit;
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@ -10266,6 +10271,9 @@ static int check_vmentry_prereqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
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vmx->nested.nested_vmx_entry_ctls_high))
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return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
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if (vmcs12->cr3_target_count > nested_cpu_vmx_misc_cr3_count(vcpu))
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return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
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if (!nested_host_cr0_valid(vcpu, vmcs12->host_cr0) ||
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!nested_host_cr4_valid(vcpu, vmcs12->host_cr4) ||
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!nested_cr3_valid(vcpu, vmcs12->host_cr3))
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