Commit f0f4cf5b authored Apr 11, 2018 by Krish Sadhukhan Committed by Paolo Bonzini Apr 12, 2018

x86: Add check for APIC access address for vmentry of L2 guests



According to the sub-section titled 'VM-Execution Control Fields' in the
section titled 'Basic VM-Entry Checks' in Intel SDM vol. 3C, the following
vmentry check must be enforced:

    If the 'virtualize APIC-accesses' VM-execution control is 1, the
    APIC-access address must satisfy the following checks:

	- Bits 11:0 of the address must be 0.
	- The address should not set any bits beyond the processor's
	  physical-address width.

This patch adds the necessary check to conform to this rule. If the check
fails, we cause the L2 VMENTRY to fail which is what the associated unit
test (following patch) expects.

Reviewed-by: Mihai Carabas <mihai.carabas@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 2698d82e

arch/x86/kvm/vmx.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -10602,6 +10602,16 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
		return true;
		}

		static int nested_vmx_check_apic_access_controls(struct kvm_vcpu *vcpu,
		struct vmcs12 *vmcs12)
		{
		if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) &&
		!page_address_valid(vcpu, vmcs12->apic_access_addr))
		return -EINVAL;
		else
		return 0;
		}

		static int nested_vmx_check_apicv_controls(struct kvm_vcpu *vcpu,
		struct vmcs12 *vmcs12)
		{
		@@ -11293,6 +11303,9 @@ static int check_vmentry_prereqs(struct kvm_vcpu vcpu, struct vmcs12 vmcs12)
		if (nested_vmx_check_msr_bitmap_controls(vcpu, vmcs12))
		return VMXERR_ENTRY_INVALID_CONTROL_FIELD;

		if (nested_vmx_check_apic_access_controls(vcpu, vmcs12))
		return VMXERR_ENTRY_INVALID_CONTROL_FIELD;

		if (nested_vmx_check_tpr_shadow_controls(vcpu, vmcs12))
		return VMXERR_ENTRY_INVALID_CONTROL_FIELD;