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      1 /*	$NetBSD: isqemu.h,v 1.6 2021/12/15 09:19:28 gson Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of The NetBSD Foundation nor the names of its
     19  *    contributors may be used to endorse or promote products derived
     20  *    from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     32  * POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 #include <sys/param.h>
     35 #include <sys/sysctl.h>
     36 #include <sys/drvctlio.h>
     37 #include <sys/ioctl.h>
     38 #include <fcntl.h>
     39 #include <stdbool.h>
     40 #include <stdlib.h>
     41 #include <string.h>
     42 #include <errno.h>
     43 #include <err.h>
     44 #include <unistd.h>
     45 
     46 static __inline bool
     47 isQEMU(void) {
     48        struct devlistargs dla = {
     49 	       .l_devname = "qemufwcfg0",
     50 	       .l_childname = NULL,
     51 	       .l_children = 0,
     52        };
     53        int fd = open(DRVCTLDEV, O_RDONLY, 0);
     54        if (fd == -1)
     55 	       return false;
     56        if (ioctl(fd, DRVLISTDEV, &dla) == -1) {
     57 	       close(fd);
     58 	       return false;
     59        }
     60        close(fd);
     61        return true;
     62 }
     63 
     64 static __inline bool
     65 isQEMU_TCG(void) {
     66 #if defined(__i386__) || defined(__x86_64__)
     67 	char name[1024];
     68 	size_t len = sizeof(name);
     69 
     70 	if (sysctlbyname("machdep.cpu_brand", name, &len, NULL, 0) == -1) {
     71 		if (errno == ENOENT)
     72 			return false;
     73 		err(EXIT_FAILURE, "sysctl");
     74 	}
     75 	if (strstr(name, "QEMU") == NULL)
     76 		return false;
     77 	if (sysctlbyname("machdep.hypervisor", name, &len, NULL, 0) == -1) {
     78 		if (errno == ENOENT)
     79 			return true;
     80 		err(EXIT_FAILURE, "sysctl");
     81 	}
     82 	if (strcmp(name, "KVM") == 0)
     83 		return false;
     84 	return true;
     85 #endif
     86 	return false;
     87 }
     88 
     89 #ifdef TEST
     90 int
     91 main(void) {
     92 	return isQEMU();
     93 }
     94 #endif
     95