Commit 16fb9a46 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

KVM: nVMX: do early preparation of vmcs02 before check_vmentry_postreqs() 



In anticipation of using vmcs02 to do early consistency checks, move
the early preparation of vmcs02 prior to checking the postreqs.  The
downside of this approach is that we'll unnecessary load vmcs02 in
the case that check_vmentry_postreqs() fails, but that is essentially
our slow path anyways (not actually slow, but it's the path we don't
really care about optimizing).

Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: default avatarJim Mattson <jmattson@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 9d6105b2

arch/x86/kvm/vmx.c

+12 −10
Original line number Diff line number Diff line
@@ -12701,11 +12701,6 @@ static int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, 
	if (likely(!evaluate_pending_interrupts) && kvm_vcpu_apicv_active(vcpu))

		evaluate_pending_interrupts |= vmx_has_apicv_interrupt(vcpu);



	if (from_vmentry && check_vmentry_postreqs(vcpu, vmcs12, &exit_qual))

		goto vmentry_fail_vmexit;



	enter_guest_mode(vcpu);



	if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))

		vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);

	if (kvm_mpx_supported() &&
@@ -12714,17 +12709,23 @@ static int nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu, 


	vmx_switch_vmcs(vcpu, &vmx->nested.vmcs02);



	prepare_vmcs02_early(vmx, vmcs12);



	if (from_vmentry) {

		nested_get_vmcs12_pages(vcpu);



		if (check_vmentry_postreqs(vcpu, vmcs12, &exit_qual))

			goto vmentry_fail_vmexit;

	}



	enter_guest_mode(vcpu);

	if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)

		vcpu->arch.tsc_offset += vmcs12->tsc_offset;



	prepare_vmcs02_early(vmx, vmcs12);



	if (prepare_vmcs02(vcpu, vmcs12, &exit_qual))

		goto vmentry_fail_vmexit_guest_mode;



	if (from_vmentry) {

		nested_get_vmcs12_pages(vcpu);



		exit_reason = EXIT_REASON_MSR_LOAD_FAIL;

		exit_qual = nested_vmx_load_msr(vcpu,

						vmcs12->vm_entry_msr_load_addr,
@@ -12776,12 +12777,13 @@ vmentry_fail_vmexit_guest_mode: 
	if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)

		vcpu->arch.tsc_offset -= vmcs12->tsc_offset;

	leave_guest_mode(vcpu);



vmentry_fail_vmexit:

	vmx_switch_vmcs(vcpu, &vmx->vmcs01);



	if (!from_vmentry)

		return 1;



vmentry_fail_vmexit:

	load_vmcs12_host_state(vcpu, vmcs12);

	vmcs12->vm_exit_reason = exit_reason | VMX_EXIT_REASONS_FAILED_VMENTRY;

	vmcs12->exit_qualification = exit_qual;

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