/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2022 Oxide Computer Company
 */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <strings.h>
#include <libgen.h>
#include <assert.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/debug.h>
#include <sys/vmm.h>
#include <sys/vmm_dev.h>
#include <vmmapi.h>

#include "in_guest.h"
#include "test_defs.h"

const char *strict_name = "STRICT_APICV";

static bool
strict_apicv(void)
{
        const char *strict_val;

        if ((strict_val = getenv(strict_name)) != NULL) {
                if (strlen(strict_val) != 0 &&
                    strcmp(strict_val, "0") != 0) {
                        return (true);
                }
        }
        return (false);
}

int
main(int argc, char *argv[])
{
        const char *test_suite_name = basename(argv[0]);
        struct vmctx *ctx = NULL;
        struct vcpu *vcpu;
        int err;

        ctx = test_initialize(test_suite_name);

        if ((vcpu = vm_vcpu_open(ctx, 0)) == NULL) {
                test_fail_errno(errno, "Could not open vcpu0");
        }

        err = test_setup_vcpu(vcpu, MEM_LOC_PAYLOAD, MEM_LOC_STACK);
        if (err != 0) {
                test_fail_errno(err, "Could not initialize vcpu0");
        }

        /*
         * Although x2APIC should be off by default, make doubly sure by
         * explicitly setting it so.
         */
        err = vm_set_x2apic_state(vcpu, X2APIC_DISABLED);
        if (err != 0) {
                test_fail_errno(err, "Could not disable x2apic on vcpu0");
        }

        struct vm_entry ventry = { 0 };
        struct vm_exit vexit = { 0 };

        do {
                const enum vm_exit_kind kind =
                    test_run_vcpu(vcpu, &ventry, &vexit);
                switch (kind) {
                case VEK_REENTR:
                        break;
                case VEK_TEST_PASS:
                        test_pass();
                        break;
                case VEK_TEST_FAIL:
                        test_fail_msg("payload signaled failure");
                        break;
                case VEK_UNHANDLED:
                        /*
                         * Not all APICv-accelerated accesses are properly
                         * handled by the in-kernel emulation today.
                         * (See: illumos #13847).
                         *
                         * To allow this test to be useful on systems without
                         * APICv, we suppress such failures unless explicitly
                         * strict handling is requested.
                         */
                        if (vexit.exitcode == VM_EXITCODE_VMX &&
                            (vexit.u.vmx.exit_reason == 44 ||
                            vexit.u.vmx.exit_reason == 56)) {
                                if (strict_apicv()) {
                                        test_fail_vmexit(&vexit);
                                }
                                (void) fprintf(stderr,
                                    "Ignoring APICv access issue\n"
                                    "If strictness is desired, "
                                    "run with %s=1 in env\n", strict_name);
                                test_pass();
                        }
                        test_fail_vmexit(&vexit);
                        break;
                default:
                        test_fail_vmexit(&vexit);
                        break;
                }
        } while (true);
}