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Commit 858e25c0 authored by Jim Mattson's avatar Jim Mattson Committed by Paolo Bonzini
Browse files

kvm: nVMX: Refactor nested_vmx_run() 



Nested_vmx_run is split into two parts: the part that handles the
VMLAUNCH/VMRESUME instruction, and the part that modifies the vcpu state
to transition from VMX root mode to VMX non-root mode. The latter will
be used when restoring the checkpointed state of a vCPU that was in VMX
operation when a snapshot was taken.

Signed-off-by: default avatarJim Mattson <jmattson@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent ca0bde28

arch/x86/kvm/vmx.c

+62 −49
Original line number Diff line number Diff line
@@ -10507,6 +10507,65 @@ static int check_vmentry_postreqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, 
	return 0;

}



static int enter_vmx_non_root_mode(struct kvm_vcpu *vcpu, bool from_vmentry)

{

	struct vcpu_vmx *vmx = to_vmx(vcpu);

	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);

	struct loaded_vmcs *vmcs02;

	int cpu;

	u32 msr_entry_idx;

	u32 exit_qual;



	vmcs02 = nested_get_current_vmcs02(vmx);

	if (!vmcs02)

		return -ENOMEM;



	enter_guest_mode(vcpu);



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

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



	cpu = get_cpu();

	vmx->loaded_vmcs = vmcs02;

	vmx_vcpu_put(vcpu);

	vmx_vcpu_load(vcpu, cpu);

	vcpu->cpu = cpu;

	put_cpu();



	vmx_segment_cache_clear(vmx);



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

		leave_guest_mode(vcpu);

		vmx_load_vmcs01(vcpu);

		nested_vmx_entry_failure(vcpu, vmcs12,

					 EXIT_REASON_INVALID_STATE, exit_qual);

		return 1;

	}



	nested_get_vmcs12_pages(vcpu, vmcs12);



	msr_entry_idx = nested_vmx_load_msr(vcpu,

					    vmcs12->vm_entry_msr_load_addr,

					    vmcs12->vm_entry_msr_load_count);

	if (msr_entry_idx) {

		leave_guest_mode(vcpu);

		vmx_load_vmcs01(vcpu);

		nested_vmx_entry_failure(vcpu, vmcs12,

				EXIT_REASON_MSR_LOAD_FAIL, msr_entry_idx);

		return 1;

	}



	vmcs12->launch_state = 1;



	/*

	 * Note no nested_vmx_succeed or nested_vmx_fail here. At this point

	 * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet

	 * returned as far as L1 is concerned. It will only return (and set

	 * the success flag) when L2 exits (see nested_vmx_vmexit()).

	 */

	return 0;

}



/*

 * nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1

 * for running an L2 nested guest.
@@ -10515,9 +10574,6 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
{

	struct vmcs12 *vmcs12;

	struct vcpu_vmx *vmx = to_vmx(vcpu);

	int cpu;

	struct loaded_vmcs *vmcs02;

	u32 msr_entry_idx;

	u32 exit_qual;

	int ret;
@@ -10576,58 +10632,15 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
	 * the nested entry.

	 */



	vmcs02 = nested_get_current_vmcs02(vmx);

	if (!vmcs02)

		return -ENOMEM;



	enter_guest_mode(vcpu);



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

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



	cpu = get_cpu();

	vmx->loaded_vmcs = vmcs02;

	vmx_vcpu_put(vcpu);

	vmx_vcpu_load(vcpu, cpu);

	vcpu->cpu = cpu;

	put_cpu();



	vmx_segment_cache_clear(vmx);



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

		leave_guest_mode(vcpu);

		vmx_load_vmcs01(vcpu);

		nested_vmx_entry_failure(vcpu, vmcs12,

				EXIT_REASON_INVALID_STATE, exit_qual);

		return 1;

	}



	nested_get_vmcs12_pages(vcpu, vmcs12);



	msr_entry_idx = nested_vmx_load_msr(vcpu,

					    vmcs12->vm_entry_msr_load_addr,

					    vmcs12->vm_entry_msr_load_count);

	if (msr_entry_idx) {

		leave_guest_mode(vcpu);

		vmx_load_vmcs01(vcpu);

		nested_vmx_entry_failure(vcpu, vmcs12,

				EXIT_REASON_MSR_LOAD_FAIL, msr_entry_idx);

		return 1;

	}



	vmcs12->launch_state = 1;

	ret = enter_vmx_non_root_mode(vcpu, true);

	if (ret)

		return ret;



	if (vmcs12->guest_activity_state == GUEST_ACTIVITY_HLT)

		return kvm_vcpu_halt(vcpu);



	vmx->nested.nested_run_pending = 1;



	/*

	 * Note no nested_vmx_succeed or nested_vmx_fail here. At this point

	 * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet

	 * returned as far as L1 is concerned. It will only return (and set

	 * the success flag) when L2 exits (see nested_vmx_vmexit()).

	 */

	return 1;



out: