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Commit 98d9e858 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: nVMX: Return -EINVAL when signaling failure in pre-VM-Entry helpers 



Convert all top-level nested VM-Enter consistency check functions to
return 0/-EINVAL instead of failure codes, since now they can only
ever return one failure code.

This also does not give the false impression that failure information is
always consumed and/or relevant, e.g. vmx_set_nested_state() only
cares whether or not the checks were successful.

nested_check_host_control_regs() can also now be inlined into its caller,
nested_vmx_check_host_state, since the two have effectively become the
same function.

Based on a patch by Sean Christopherson.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 5478ba34

arch/x86/kvm/vmx/nested.c

+7 −21
Original line number Diff line number Diff line
@@ -2595,15 +2595,12 @@ static int nested_vmx_check_controls(struct kvm_vcpu *vcpu, 
	if (nested_check_vm_execution_controls(vcpu, vmcs12) ||

	    nested_check_vm_exit_controls(vcpu, vmcs12) ||

	    nested_check_vm_entry_controls(vcpu, vmcs12))

		return VMXERR_ENTRY_INVALID_CONTROL_FIELD;

		return -EINVAL;



	return 0;

}



/*

 * Checks related to Host Control Registers and MSRs

 */

static int nested_check_host_control_regs(struct kvm_vcpu *vcpu,

static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu,

				       struct vmcs12 *vmcs12)

{

	bool ia32e;
@@ -2639,15 +2636,6 @@ static int nested_check_host_control_regs(struct kvm_vcpu *vcpu, 
	return 0;

}



static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu,

				       struct vmcs12 *vmcs12)

{

	if (nested_check_host_control_regs(vcpu, vmcs12))

		return VMXERR_ENTRY_INVALID_HOST_STATE_FIELD;



	return 0;

}



static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,

					  struct vmcs12 *vmcs12)

{
@@ -3159,13 +3147,11 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
			launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS

			       : VMXERR_VMRESUME_NONLAUNCHED_VMCS);



	ret = nested_vmx_check_controls(vcpu, vmcs12);

	if (ret)

		return nested_vmx_failValid(vcpu, ret);

	if (nested_vmx_check_controls(vcpu, vmcs12))

		return nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);



	ret = nested_vmx_check_host_state(vcpu, vmcs12);

	if (ret)

		return nested_vmx_failValid(vcpu, ret);

	if (nested_vmx_check_host_state(vcpu, vmcs12))

		return nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);



	/*

	 * We're finally done with prerequisite checking, and can start with