Function svm_handle_io

freebsd/amd64/vmm/amd/svm.c:772–821

* Handle guest I/O intercept. */

 * Handle guest I/O intercept.
 */
static int
svm_handle_io(struct svm_softc *svm_sc, int vcpu, struct vm_exit *vmexit)
{
	struct vmcb_ctrl *ctrl;
	struct vmcb_state *state;
	struct svm_regctx *regs;
	struct vm_inout_str *vis;
	uint64_t info1;
	int inout_string;

	state = svm_get_vmcb_state(svm_sc, vcpu);
	ctrl  = svm_get_vmcb_ctrl(svm_sc, vcpu);
	regs  = svm_get_guest_regctx(svm_sc, vcpu);

	info1 = ctrl->exitinfo1;
	inout_string = info1 & BIT(2) ? 1 : 0;

	/*
	 * The effective segment number in EXITINFO1[12:10] is populated
	 * only if the processor has the DecodeAssist capability.
	 *
	 * XXX this is not specified explicitly in APMv2 but can be verified
	 * empirically.
	 */
	if (inout_string && !decode_assist())
		return (UNHANDLED);

	vmexit->exitcode 	= VM_EXITCODE_INOUT;
	vmexit->u.inout.in 	= (info1 & BIT(0)) ? 1 : 0;
	vmexit->u.inout.string 	= inout_string;
	vmexit->u.inout.rep 	= (info1 & BIT(3)) ? 1 : 0;
	vmexit->u.inout.bytes 	= (info1 >> 4) & 0x7;
	vmexit->u.inout.port 	= (uint16_t)(info1 >> 16);
	vmexit->u.inout.eax 	= (uint32_t)(state->rax);

	if (inout_string) {
		vmexit->exitcode = VM_EXITCODE_INOUT_STR;
		vis = &vmexit->u.inout_str;
		svm_paging_info(svm_get_vmcb(svm_sc, vcpu), &vis->paging);
		vis->rflags = state->rflags;
		vis->cr0 = state->cr0;
		vis->index = svm_inout_str_index(regs, vmexit->u.inout.in);
		vis->count = svm_inout_str_count(regs, vmexit->u.inout.rep);
		vis->addrsize = svm_inout_str_addrsize(info1);
		svm_inout_str_seginfo(svm_sc, vcpu, info1,
		    vmexit->u.inout.in, vis);
	}

	return (UNHANDLED);
}

static int
npf_fault_type(uint64_t exitinfo1)