lscpu: detect more hypervisor vendors

[kzak@redhat.com: - cleanup coding style,
                  - use path_exist()]

Signed-off-by: Ondrej Oprala <ooprala@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 272 insertions, 0 deletions

diff --git a/sys-utils/lscpu-dmi.c b/sys-utils/lscpu-dmi.c
new file mode 100644
index 000000000..21e024bc4
--- /dev/null
+++ b/sys-utils/lscpu-dmi.c
@@ -0,0 +1,272 @@
+/*
+ * lscpu-dmi - Module to parse SMBIOS information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Code originally taken from the dmidecode utility and slightly rewritten
+ * to suite the needs of lscpu
+ */
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "c.h"
+#include "pathnames.h"
+#include "all-io.h"
+#include "lscpu.h"
+
+#define WORD(x) (uint16_t)(*(const uint16_t *)(x))
+#define DWORD(x) (uint32_t)(*(const uint32_t *)(x))
+
+struct dmi_header
+{
+	uint8_t type;
+	uint8_t length;
+	uint16_t handle;
+	uint8_t *data;
+};
+
+static int checksum(const uint8_t *buf, size_t len)
+{
+	uint8_t sum = 0;
+	size_t a;
+
+	for (a = 0; a < len; a++)
+		sum += buf[a];
+	return (sum == 0);
+}
+
+static void *get_mem_chunk(size_t base, size_t len, const char *devmem)
+{
+	void *p;
+	int fd;
+
+	if ((fd = open(devmem, O_RDONLY)) == -1)
+		return NULL;
+	if ((p = malloc(len)) == NULL)
+		return NULL;
+	if (lseek(fd, base, SEEK_SET) == -1) {
+		free(p);
+		return NULL;
+	}
+	if (read_all(fd, p, len) == -1) {
+		free(p);
+		return NULL;
+	}
+
+	close(fd);
+	return p;
+}
+
+static void to_dmi_header(struct dmi_header *h, uint8_t *data)
+{
+	h->type = data[0];
+	h->length = data[1];
+	h->handle = WORD(data + 2);
+	h->data = data;
+}
+
+static char *dmi_string(const struct dmi_header *dm, uint8_t s)
+{
+	char *bp = (char *)dm->data;
+
+	if (s == 0)
+		return NULL;
+
+	bp += dm->length;
+	while (s > 1 && *bp)
+	{
+		bp += strlen(bp);
+		bp++;
+		s--;
+	}
+
+	if (!*bp)
+		return NULL;
+
+	return bp;
+}
+
+static int hypervisor_from_dmi_table(uint32_t base, uint16_t len,
+				uint16_t num, const char *devmem)
+{
+	uint8_t *buf = NULL;
+	uint8_t *data;
+	int i = 0;
+	char *vendor = NULL;
+	char *product = NULL;
+	char *manufacturer = NULL;
+
+	if ((buf = get_mem_chunk(base, len, devmem)) == NULL)
+		return HYPER_NONE;
+	data = buf;
+
+	 /* 4 is the length of an SMBIOS structure header */
+	while (i < num && data + 4 <= buf + len) {
+		uint8_t *next;
+		struct dmi_header h;
+
+		to_dmi_header(&h, data);
+
+		/*
+		 * If a short entry is found (less than 4 bytes), not only it
+		 * is invalid, but we cannot reliably locate the next entry.
+		 * Better stop at this point.
+		 */
+		if (h.length < 4)
+			return HYPER_NONE;
+
+		/* look for the next handle */
+		next = data + h.length;
+		while (next - buf + 1 < len && (next[0] != 0 || next[1] != 0))
+			next++;
+		next += 2;
+		switch (h.type) {
+			case 0:
+				vendor = dmi_string(&h, data[0x04]);
+				break;
+			case 1:
+				manufacturer = dmi_string(&h, data[0x04]);
+				product = dmi_string(&h, data[0x05]);
+				break;
+			default:
+				break;
+		}
+
+		data = next;
+		i++;
+	}
+	if (!strcmp(manufacturer, "innotek GmbH"))
+		return HYPER_INNOTEK;
+	else if (strstr(manufacturer, "HITACHI") && strstr(product, "LPAR"))
+		return HYPER_HITACHI;
+	else if (!strcmp(vendor, "Parallels"))
+		return HYPER_PARALLELS;
+
+	free(buf);
+	return HYPER_NONE;
+}
+
+static int hypervisor_decode_legacy(uint8_t *buf, const char *devmem)
+{
+	if (!checksum(buf, 0x0F))
+		return HYPER_NONE;
+
+	return hypervisor_from_dmi_table(DWORD(buf + 0x08), WORD(buf + 0x06),
+			 WORD(buf + 0x0C),
+		devmem);
+}
+
+static int hypervisor_decode_smbios(uint8_t *buf, const char *devmem)
+{
+	if (!checksum(buf, buf[0x05])
+	    || memcmp(buf + 0x10, "_DMI_", 5) != 0
+	    || !checksum(buf + 0x10, 0x0F))
+		return -1;
+
+	return hypervisor_from_dmi_table(DWORD(buf + 0x18), WORD(buf + 0x16),
+			 WORD(buf + 0x1C),
+		devmem);
+}
+
+/*
+ * Probe for EFI interface
+ */
+#define EFI_NOT_FOUND   (-1)
+#define EFI_NO_SMBIOS   (-2)
+static int address_from_efi(size_t *address)
+{
+	FILE *tab;
+	char linebuf[64];
+	int ret;
+
+	*address = 0; /* Prevent compiler warning */
+
+	/*
+	 * Linux up to 2.6.6: /proc/efi/systab
+	 * Linux 2.6.7 and up: /sys/firmware/efi/systab
+	 */
+	if (!(tab = fopen("/sys/firmware/efi/systab", "r")) &&
+	    !(tab = fopen("/proc/efi/systab", "r")))
+		return EFI_NOT_FOUND;		/* No EFI interface */
+
+	ret = EFI_NO_SMBIOS;
+	while ((fgets(linebuf, sizeof(linebuf) - 1, tab)) != NULL) {
+		char *addrp = strchr(linebuf, '=');
+		*(addrp++) = '\0';
+		if (strcmp(linebuf, "SMBIOS") == 0) {
+			*address = strtoul(addrp, NULL, 0);
+			ret = 0;
+			break;
+		}
+	}
+
+	fclose(tab);
+	return ret;
+}
+
+int read_hypervisor_dmi(void)
+{
+	int ret = HYPER_NONE;
+	uint8_t *buf = NULL;
+	size_t fp = 0;
+
+	if (sizeof(uint8_t) != 1
+	    || sizeof(uint16_t) != 2
+	    || sizeof(uint32_t) != 4
+	    || '\0' != 0)
+		return ret;
+
+	/* First try EFI (ia64, Intel-based Mac) */
+	switch (address_from_efi(&fp)) {
+		case EFI_NOT_FOUND:
+			goto memory_scan;
+		case EFI_NO_SMBIOS:
+			goto exit_free;
+	}
+
+	buf = get_mem_chunk(fp, 0x20, _PATH_DEV_MEM);
+	if (!buf)
+		goto exit_free;
+
+	if (hypervisor_decode_smbios(buf, _PATH_DEV_MEM))
+		goto done;
+
+memory_scan:
+	/* Fallback to memory scan (x86, x86_64) */
+	buf = get_mem_chunk(0xF0000, 0x10000, _PATH_DEV_MEM);
+	if (!buf)
+		goto exit_free;
+
+	for (fp = 0; fp <= 0xFFF0; fp += 16) {
+		if (memcmp(buf + fp, "_SM_", 4) == 0 && fp <= 0xFFE0) {
+			if ((ret = hypervisor_decode_smbios(buf + fp,
+						 _PATH_DEV_MEM)) == -1)
+				fp += 16;
+
+		} else if (memcmp(buf + fp, "_DMI_", 5) == 0)
+			ret = hypervisor_decode_legacy(buf + fp, _PATH_DEV_MEM);
+	}
+
+done:
+	free(buf);
+exit_free:
+	return ret;
+}