Commit 4580dbef authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: TDX: Exit to userspace for SetupEventNotifyInterrupt 



Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 25e8b1dd

Documentation/virt/kvm/api.rst

+7 −0
Original line number Diff line number Diff line
@@ -7196,6 +7196,10 @@ The valid value for 'flags' is: 
					u64 leaf;

					u64 r11, r12, r13, r14;

				} get_tdvmcall_info;

				struct {

					u64 ret;

					u64 vector;

				} setup_event_notify;

			};

		} tdx;
@@ -7226,6 +7230,9 @@ status of TDVMCALLs. The output values for the given leaf should be 
placed in fields from ``r11`` to ``r14`` of the ``get_tdvmcall_info``

field of the union.



* ``TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT``: the guest has requested to

set up a notification interrupt for vector ``vector``.



KVM may add support for more values in the future that may cause a userspace

exit, even without calls to ``KVM_ENABLE_CAP`` or similar.  In this case,

it will enter with output fields already valid; in the common case, the

arch/x86/include/asm/shared/tdx.h

+1 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ 
#define TDVMCALL_MAP_GPA		0x10001

#define TDVMCALL_GET_QUOTE		0x10002

#define TDVMCALL_REPORT_FATAL_ERROR	0x10003

#define TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT 0x10004ULL



/*

 * TDG.VP.VMCALL Status Codes (returned in R10)

arch/x86/kvm/vmx/tdx.c

+23 −0
Original line number Diff line number Diff line
@@ -1530,6 +1530,27 @@ static int tdx_get_quote(struct kvm_vcpu *vcpu) 
	return 0;

}



static int tdx_setup_event_notify_interrupt(struct kvm_vcpu *vcpu)

{

	struct vcpu_tdx *tdx = to_tdx(vcpu);

	u64 vector = tdx->vp_enter_args.r12;



	if (vector < 32 || vector > 255) {

		tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_INVALID_OPERAND);

		return 1;

	}



	vcpu->run->exit_reason = KVM_EXIT_TDX;

	vcpu->run->tdx.flags = 0;

	vcpu->run->tdx.nr = TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT;

	vcpu->run->tdx.setup_event_notify.ret = TDVMCALL_STATUS_SUBFUNC_UNSUPPORTED;

	vcpu->run->tdx.setup_event_notify.vector = vector;



	vcpu->arch.complete_userspace_io = tdx_complete_simple;



	return 0;

}



static int handle_tdvmcall(struct kvm_vcpu *vcpu)

{

	switch (tdvmcall_leaf(vcpu)) {
@@ -1541,6 +1562,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) 
		return tdx_get_td_vm_call_info(vcpu);

	case TDVMCALL_GET_QUOTE:

		return tdx_get_quote(vcpu);

	case TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT:

		return tdx_setup_event_notify_interrupt(vcpu);

	default:

		break;

	}

include/uapi/linux/kvm.h

+4 −0
Original line number Diff line number Diff line
@@ -467,6 +467,10 @@ struct kvm_run { 
					__u64 leaf;

					__u64 r11, r12, r13, r14;

				} get_tdvmcall_info;

				struct {

					__u64 ret;

					__u64 vector;

				} setup_event_notify;

			};

		} tdx;

		/* Fix the size of the union. */