/*	$NetBSD: nvmmctl.c,v 1.2 2020/09/05 07:22:26 maxv Exp $	*/

/*
 * Copyright (c) 2019-2020 Maxime Villard, m00nbsd.net
 * All rights reserved.
 *
 * This code is part of the NVMM hypervisor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: nvmmctl.c,v 1.2 2020/09/05 07:22:26 maxv Exp $");
#endif /* not lint */

#include <sys/param.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <util.h>
#include <nvmm.h>

#include <x86/specialreg.h>

__dead static void usage(void);
static void nvmm_identify(char **);
static void nvmm_list(char **);

static struct cmdtab {
	const char *label;
	bool takesargs;
	bool argsoptional;
	void (*func)(char **);
} const nvmm_cmdtab[] = {
	{ "identify",	false, false, nvmm_identify },
	{ "list",	false, false, nvmm_list },
	{ NULL,		false, false, NULL },
};

static struct nvmm_capability cap;

int
main(int argc, char **argv)
{
	const struct cmdtab *ct;

	argc -= 1;
	argv += 1;
	if (argc < 1)
		usage();

	for (ct = nvmm_cmdtab; ct->label != NULL; ct++) {
		if (strcmp(argv[0], ct->label) == 0) {
			if (!ct->argsoptional &&
			    ((ct->takesargs == 0) ^ (argv[1] == NULL)))
			{
				usage();
			}
			(*ct->func)(argv + 1);
			break;
		}
	}

	if (ct->label == NULL)
		errx(EXIT_FAILURE, "unknown command ``%s''", argv[0]);

	exit(EXIT_SUCCESS);
	/* NOTREACHED */
}

static void
usage(void)
{
	const char *progname = getprogname();

	fprintf(stderr, "usage: %s identify\n", progname);
	fprintf(stderr, "       %s list\n", progname);
	exit(EXIT_FAILURE);
	/* NOTREACHED */
}

#define MACH_CONF_FLAGS		"\20"
#define VCPU_CONF_FLAGS		"\20" "\1" "CPUID" "\2" "TPR"

static void
nvmm_identify(char **argv)
{
	char buf[256], ram[4+1];

	if (nvmm_init() == -1)
		err(EXIT_FAILURE, "nvmm_init failed");
	if (nvmm_capability(&cap) == -1)
		err(EXIT_FAILURE, "nvmm_capability failed");

	printf("nvmm: Kernel API version %u\n", cap.version);
	printf("nvmm: State size %u\n", cap.state_size);
	printf("nvmm: Max machines %u\n", cap.max_machines);
	printf("nvmm: Max VCPUs per machine %u\n", cap.max_vcpus);

	if (humanize_number(ram, sizeof(ram), cap.max_ram, NULL, HN_AUTOSCALE,
	    (HN_DECIMAL | HN_B | HN_NOSPACE)) == -1)
		err(EXIT_FAILURE, "humanize_number");
	printf("nvmm: Max RAM per machine %s\n", ram);

	snprintb(buf, sizeof(buf), MACH_CONF_FLAGS, cap.arch.mach_conf_support);
	printf("nvmm: Arch Mach conf %s\n", buf);

	snprintb(buf, sizeof(buf), VCPU_CONF_FLAGS, cap.arch.vcpu_conf_support);
	printf("nvmm: Arch VCPU conf %s\n", buf);

	snprintb(buf, sizeof(buf), XCR0_FLAGS1, cap.arch.xcr0_mask);
	printf("nvmm: Guest FPU states %s\n", buf);
}

static void
nvmm_list(char **argv)
{
	struct nvmm_ctl_mach_info machinfo;
	char ram[4+1], *ts;
	size_t i;
	int ret;

	if (nvmm_root_init() == -1)
		err(EXIT_FAILURE, "nvmm_root_init failed");
	if (nvmm_capability(&cap) == -1)
		err(EXIT_FAILURE, "nvmm_capability failed");

	printf(
	    "Machine ID VCPUs RAM  Owner PID Creation Time           \n"
	    "---------- ----- ---- --------- ------------------------\n");

	for (i = 0; i < cap.max_machines; i++) {
		machinfo.machid = i;
		ret = nvmm_ctl(NVMM_CTL_MACH_INFO, &machinfo, sizeof(machinfo));
		if (ret == -1) {
			if (errno == ENOENT)
				continue;
			err(EXIT_FAILURE, "nvmm_ctl failed");
		}

		ts = asctime(localtime(&machinfo.time));
		ts[strlen(ts) - 1] = '\0';

		if (humanize_number(ram, sizeof(ram), machinfo.nram, NULL,
		    HN_AUTOSCALE, (HN_DECIMAL | HN_B | HN_NOSPACE)) == -1)
			err(EXIT_FAILURE, "humanize_number");

		printf("%-10zu %-5u %-4s %-9d %s\n", i, machinfo.nvcpus, ram,
		    machinfo.pid, ts);
	}
}