2 * QEMU Guest Agent POSIX-specific command implementations
4 * Copyright IBM Corp. 2011
7 * Michael Roth <mdroth@linux.vnet.ibm.com>
8 * Michal Privoznik <mprivozn@redhat.com>
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
15 #include <sys/types.h>
16 #include <sys/ioctl.h>
26 #include "qga/guest-agent-core.h"
27 #include "qga-qmp-commands.h"
28 #include "qapi/qmp/qerror.h"
29 #include "qemu/queue.h"
30 #include "qemu/host-utils.h"
32 #ifndef CONFIG_HAS_ENVIRON
34 #include <crt_externs.h>
35 #define environ (*_NSGetEnviron())
37 extern char **environ;
41 #if defined(__linux__)
45 #include <arpa/inet.h>
46 #include <sys/socket.h>
50 #define CONFIG_FSFREEZE
57 static void ga_wait_child(pid_t pid, int *status, Error **errp)
64 rpid = waitpid(pid, status, 0);
65 } while (rpid == -1 && errno == EINTR);
68 error_setg_errno(errp, errno, "failed to wait for child (pid: %d)",
73 g_assert(rpid == pid);
76 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
78 const char *shutdown_flag;
79 Error *local_err = NULL;
83 slog("guest-shutdown called, mode: %s", mode);
84 if (!has_mode || strcmp(mode, "powerdown") == 0) {
86 } else if (strcmp(mode, "halt") == 0) {
88 } else if (strcmp(mode, "reboot") == 0) {
92 "mode is invalid (valid values are: halt|powerdown|reboot");
98 /* child, start the shutdown */
100 reopen_fd_to_null(0);
101 reopen_fd_to_null(1);
102 reopen_fd_to_null(2);
104 execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
105 "hypervisor initiated shutdown", (char*)NULL, environ);
107 } else if (pid < 0) {
108 error_setg_errno(errp, errno, "failed to create child process");
112 ga_wait_child(pid, &status, &local_err);
114 error_propagate(errp, local_err);
118 if (!WIFEXITED(status)) {
119 error_setg(errp, "child process has terminated abnormally");
123 if (WEXITSTATUS(status)) {
124 error_setg(errp, "child process has failed to shutdown");
131 int64_t qmp_guest_get_time(Error **errp)
137 ret = qemu_gettimeofday(&tq);
139 error_setg_errno(errp, errno, "Failed to get time");
143 time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
147 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
152 Error *local_err = NULL;
155 /* If user has passed a time, validate and set it. */
159 /* year-2038 will overflow in case time_t is 32bit */
160 if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
161 error_setg(errp, "Time %" PRId64 " is too large", time_ns);
165 tv.tv_sec = time_ns / 1000000000;
166 tv.tv_usec = (time_ns % 1000000000) / 1000;
167 g_date_set_time_t(&date, tv.tv_sec);
168 if (date.year < 1970 || date.year >= 2070) {
169 error_setg_errno(errp, errno, "Invalid time");
173 ret = settimeofday(&tv, NULL);
175 error_setg_errno(errp, errno, "Failed to set time to guest");
180 /* Now, if user has passed a time to set and the system time is set, we
181 * just need to synchronize the hardware clock. However, if no time was
182 * passed, user is requesting the opposite: set the system time from the
183 * hardware clock (RTC). */
187 reopen_fd_to_null(0);
188 reopen_fd_to_null(1);
189 reopen_fd_to_null(2);
191 /* Use '/sbin/hwclock -w' to set RTC from the system time,
192 * or '/sbin/hwclock -s' to set the system time from RTC. */
193 execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s",
196 } else if (pid < 0) {
197 error_setg_errno(errp, errno, "failed to create child process");
201 ga_wait_child(pid, &status, &local_err);
203 error_propagate(errp, local_err);
207 if (!WIFEXITED(status)) {
208 error_setg(errp, "child process has terminated abnormally");
212 if (WEXITSTATUS(status)) {
213 error_setg(errp, "hwclock failed to set hardware clock to system time");
218 typedef struct GuestFileHandle {
221 QTAILQ_ENTRY(GuestFileHandle) next;
225 QTAILQ_HEAD(, GuestFileHandle) filehandles;
228 static int64_t guest_file_handle_add(FILE *fh, Error **errp)
230 GuestFileHandle *gfh;
233 handle = ga_get_fd_handle(ga_state, errp);
238 gfh = g_malloc0(sizeof(GuestFileHandle));
241 QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
246 static GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp)
248 GuestFileHandle *gfh;
250 QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
257 error_setg(errp, "handle '%" PRId64 "' has not been found", id);
261 typedef const char * const ccpc;
267 /* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */
268 static const struct {
271 } guest_file_open_modes[] = {
272 { (ccpc[]){ "r", NULL }, O_RDONLY },
273 { (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY },
274 { (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC },
275 { (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY },
276 { (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND },
277 { (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY },
278 { (ccpc[]){ "r+", NULL }, O_RDWR },
279 { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY },
280 { (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC },
281 { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY },
282 { (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND },
283 { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY }
287 find_open_flag(const char *mode_str, Error **errp)
291 for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
294 form = guest_file_open_modes[mode].forms;
295 while (*form != NULL && strcmp(*form, mode_str) != 0) {
303 if (mode == ARRAY_SIZE(guest_file_open_modes)) {
304 error_setg(errp, "invalid file open mode '%s'", mode_str);
307 return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK;
310 #define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \
311 S_IRGRP | S_IWGRP | \
315 safe_open_or_create(const char *path, const char *mode, Error **errp)
317 Error *local_err = NULL;
320 oflag = find_open_flag(mode, &local_err);
321 if (local_err == NULL) {
324 /* If the caller wants / allows creation of a new file, we implement it
325 * with a two step process: open() + (open() / fchmod()).
327 * First we insist on creating the file exclusively as a new file. If
328 * that succeeds, we're free to set any file-mode bits on it. (The
329 * motivation is that we want to set those file-mode bits independently
330 * of the current umask.)
332 * If the exclusive creation fails because the file already exists
333 * (EEXIST is not possible for any other reason), we just attempt to
334 * open the file, but in this case we won't be allowed to change the
335 * file-mode bits on the preexistent file.
337 * The pathname should never disappear between the two open()s in
338 * practice. If it happens, then someone very likely tried to race us.
339 * In this case just go ahead and report the ENOENT from the second
340 * open() to the caller.
342 * If the caller wants to open a preexistent file, then the first
343 * open() is decisive and its third argument is ignored, and the second
344 * open() and the fchmod() are never called.
346 fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
347 if (fd == -1 && errno == EEXIST) {
348 oflag &= ~(unsigned)O_CREAT;
349 fd = open(path, oflag);
353 error_setg_errno(&local_err, errno, "failed to open file '%s' "
354 "(mode: '%s')", path, mode);
356 qemu_set_cloexec(fd);
358 if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
359 error_setg_errno(&local_err, errno, "failed to set permission "
360 "0%03o on new file '%s' (mode: '%s')",
361 (unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
365 f = fdopen(fd, mode);
367 error_setg_errno(&local_err, errno, "failed to associate "
368 "stdio stream with file descriptor %d, "
369 "file '%s' (mode: '%s')", fd, path, mode);
376 if (oflag & O_CREAT) {
382 error_propagate(errp, local_err);
386 static int guest_file_toggle_flags(int fd, int flags, bool set, Error **err)
390 old_flags = fcntl(fd, F_GETFL);
391 if (old_flags == -1) {
392 error_setg_errno(err, errno, QERR_QGA_COMMAND_FAILED,
393 "failed to fetch filehandle flags");
397 ret = fcntl(fd, F_SETFL, set ? (old_flags | flags) : (old_flags & ~flags));
399 error_setg_errno(err, errno, QERR_QGA_COMMAND_FAILED,
400 "failed to set filehandle flags");
407 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode,
411 Error *local_err = NULL;
417 slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
418 fh = safe_open_or_create(path, mode, &local_err);
419 if (local_err != NULL) {
420 error_propagate(errp, local_err);
424 /* set fd non-blocking to avoid common use cases (like reading from a
425 * named pipe) from hanging the agent
427 if (guest_file_toggle_flags(fileno(fh), O_NONBLOCK, true, errp) < 0) {
432 handle = guest_file_handle_add(fh, errp);
438 slog("guest-file-open, handle: %" PRId64, handle);
442 void qmp_guest_file_close(int64_t handle, Error **errp)
444 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
447 slog("guest-file-close called, handle: %" PRId64, handle);
452 ret = fclose(gfh->fh);
454 error_setg_errno(errp, errno, "failed to close handle");
458 QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
462 struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
463 int64_t count, Error **errp)
465 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
466 GuestFileRead *read_data = NULL;
476 count = QGA_READ_COUNT_DEFAULT;
477 } else if (count < 0) {
478 error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
484 buf = g_malloc0(count+1);
485 read_count = fread(buf, 1, count, fh);
487 error_setg_errno(errp, errno, "failed to read file");
488 slog("guest-file-read failed, handle: %" PRId64, handle);
491 read_data = g_malloc0(sizeof(GuestFileRead));
492 read_data->count = read_count;
493 read_data->eof = feof(fh);
495 read_data->buf_b64 = g_base64_encode(buf, read_count);
504 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
505 bool has_count, int64_t count,
508 GuestFileWrite *write_data = NULL;
512 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
520 buf = g_base64_decode(buf_b64, &buf_len);
524 } else if (count < 0 || count > buf_len) {
525 error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
531 write_count = fwrite(buf, 1, count, fh);
533 error_setg_errno(errp, errno, "failed to write to file");
534 slog("guest-file-write failed, handle: %" PRId64, handle);
536 write_data = g_malloc0(sizeof(GuestFileWrite));
537 write_data->count = write_count;
538 write_data->eof = feof(fh);
546 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
547 int64_t whence, Error **errp)
549 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
550 GuestFileSeek *seek_data = NULL;
559 ret = fseek(fh, offset, whence);
561 error_setg_errno(errp, errno, "failed to seek file");
563 seek_data = g_new0(GuestFileSeek, 1);
564 seek_data->position = ftell(fh);
565 seek_data->eof = feof(fh);
572 void qmp_guest_file_flush(int64_t handle, Error **errp)
574 GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
585 error_setg_errno(errp, errno, "failed to flush file");
589 static void guest_file_init(void)
591 QTAILQ_INIT(&guest_file_state.filehandles);
594 /* linux-specific implementations. avoid this if at all possible. */
595 #if defined(__linux__)
597 #if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
598 typedef struct FsMount {
601 unsigned int devmajor, devminor;
602 QTAILQ_ENTRY(FsMount) next;
605 typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList;
607 static void free_fs_mount_list(FsMountList *mounts)
609 FsMount *mount, *temp;
615 QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
616 QTAILQ_REMOVE(mounts, mount, next);
617 g_free(mount->dirname);
618 g_free(mount->devtype);
623 static int dev_major_minor(const char *devpath,
624 unsigned int *devmajor, unsigned int *devminor)
631 if (stat(devpath, &st) < 0) {
632 slog("failed to stat device file '%s': %s", devpath, strerror(errno));
635 if (S_ISDIR(st.st_mode)) {
636 /* It is bind mount */
639 if (S_ISBLK(st.st_mode)) {
640 *devmajor = major(st.st_rdev);
641 *devminor = minor(st.st_rdev);
648 * Walk the mount table and build a list of local file systems
650 static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp)
654 char const *mtab = "/proc/self/mounts";
656 unsigned int devmajor, devminor;
658 fp = setmntent(mtab, "r");
660 error_setg(errp, "failed to open mtab file: '%s'", mtab);
664 while ((ment = getmntent(fp))) {
666 * An entry which device name doesn't start with a '/' is
667 * either a dummy file system or a network file system.
668 * Add special handling for smbfs and cifs as is done by
671 if ((ment->mnt_fsname[0] != '/') ||
672 (strcmp(ment->mnt_type, "smbfs") == 0) ||
673 (strcmp(ment->mnt_type, "cifs") == 0)) {
676 if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) {
677 /* Skip bind mounts */
681 mount = g_malloc0(sizeof(FsMount));
682 mount->dirname = g_strdup(ment->mnt_dir);
683 mount->devtype = g_strdup(ment->mnt_type);
684 mount->devmajor = devmajor;
685 mount->devminor = devminor;
687 QTAILQ_INSERT_TAIL(mounts, mount, next);
693 static void decode_mntname(char *name, int len)
696 for (i = 0; i <= len; i++) {
697 if (name[i] != '\\') {
699 } else if (name[i + 1] == '\\') {
702 } else if (name[i + 1] >= '0' && name[i + 1] <= '3' &&
703 name[i + 2] >= '0' && name[i + 2] <= '7' &&
704 name[i + 3] >= '0' && name[i + 3] <= '7') {
705 name[j++] = (name[i + 1] - '0') * 64 +
706 (name[i + 2] - '0') * 8 +
715 static void build_fs_mount_list(FsMountList *mounts, Error **errp)
718 char const *mountinfo = "/proc/self/mountinfo";
720 char *line = NULL, *dash;
723 unsigned int devmajor, devminor;
724 int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e;
726 fp = fopen(mountinfo, "r");
728 build_fs_mount_list_from_mtab(mounts, errp);
732 while (getline(&line, &n, fp) != -1) {
733 ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c",
734 &devmajor, &devminor, &dir_s, &dir_e, &check);
738 dash = strstr(line + dir_e, " - ");
742 ret = sscanf(dash, " - %n%*s%n %n%*s%n%c",
743 &type_s, &type_e, &dev_s, &dev_e, &check);
750 decode_mntname(line + dir_s, dir_e - dir_s);
751 decode_mntname(dash + dev_s, dev_e - dev_s);
753 /* btrfs reports major number = 0 */
754 if (strcmp("btrfs", dash + type_s) != 0 ||
755 dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) {
760 mount = g_malloc0(sizeof(FsMount));
761 mount->dirname = g_strdup(line + dir_s);
762 mount->devtype = g_strdup(dash + type_s);
763 mount->devmajor = devmajor;
764 mount->devminor = devminor;
766 QTAILQ_INSERT_TAIL(mounts, mount, next);
774 #if defined(CONFIG_FSFREEZE)
776 static char *get_pci_driver(char const *syspath, int pathlen, Error **errp)
784 path = g_strndup(syspath, pathlen);
785 dpath = g_strdup_printf("%s/driver", path);
786 len = readlink(dpath, buf, sizeof(buf) - 1);
789 driver = g_strdup(basename(buf));
796 static int compare_uint(const void *_a, const void *_b)
798 unsigned int a = *(unsigned int *)_a;
799 unsigned int b = *(unsigned int *)_b;
801 return a < b ? -1 : a > b ? 1 : 0;
804 /* Walk the specified sysfs and build a sorted list of host or ata numbers */
805 static int build_hosts(char const *syspath, char const *host, bool ata,
806 unsigned int *hosts, int hosts_max, Error **errp)
810 struct dirent *entry;
813 path = g_strndup(syspath, host - syspath);
816 error_setg_errno(errp, errno, "opendir(\"%s\")", path);
821 while (i < hosts_max) {
822 entry = readdir(dir);
826 if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) {
828 } else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) {
833 qsort(hosts, i, sizeof(hosts[0]), compare_uint);
840 /* Store disk device info specified by @sysfs into @fs */
841 static void build_guest_fsinfo_for_real_device(char const *syspath,
842 GuestFilesystemInfo *fs,
845 unsigned int pci[4], host, hosts[8], tgt[3];
846 int i, nhosts = 0, pcilen;
847 GuestDiskAddress *disk;
848 GuestPCIAddress *pciaddr;
849 GuestDiskAddressList *list = NULL;
850 bool has_ata = false, has_host = false, has_tgt = false;
851 char *p, *q, *driver = NULL;
853 p = strstr(syspath, "/devices/pci");
854 if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
855 pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
856 g_debug("only pci device is supported: sysfs path \"%s\"", syspath);
860 driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp);
865 p = strstr(syspath, "/target");
866 if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
867 tgt, tgt + 1, tgt + 2) == 3) {
871 p = strstr(syspath, "/ata");
876 p = strstr(syspath, "/host");
879 if (p && sscanf(q, "%u", &host) == 1) {
881 nhosts = build_hosts(syspath, p, has_ata, hosts,
882 sizeof(hosts) / sizeof(hosts[0]), errp);
888 pciaddr = g_malloc0(sizeof(*pciaddr));
889 pciaddr->domain = pci[0];
890 pciaddr->bus = pci[1];
891 pciaddr->slot = pci[2];
892 pciaddr->function = pci[3];
894 disk = g_malloc0(sizeof(*disk));
895 disk->pci_controller = pciaddr;
897 list = g_malloc0(sizeof(*list));
900 if (strcmp(driver, "ata_piix") == 0) {
901 /* a host per ide bus, target*:0:<unit>:0 */
902 if (!has_host || !has_tgt) {
903 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
906 for (i = 0; i < nhosts; i++) {
907 if (host == hosts[i]) {
908 disk->bus_type = GUEST_DISK_BUS_TYPE_IDE;
915 g_debug("no host for '%s' (driver '%s')", syspath, driver);
918 } else if (strcmp(driver, "sym53c8xx") == 0) {
919 /* scsi(LSI Logic): target*:0:<unit>:0 */
921 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
924 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
926 } else if (strcmp(driver, "virtio-pci") == 0) {
928 /* virtio-scsi: target*:0:0:<unit> */
929 disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
932 /* virtio-blk: 1 disk per 1 device */
933 disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
935 } else if (strcmp(driver, "ahci") == 0) {
936 /* ahci: 1 host per 1 unit */
937 if (!has_host || !has_tgt) {
938 g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
941 for (i = 0; i < nhosts; i++) {
942 if (host == hosts[i]) {
944 disk->bus_type = GUEST_DISK_BUS_TYPE_SATA;
949 g_debug("no host for '%s' (driver '%s')", syspath, driver);
953 g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
957 list->next = fs->disk;
964 qapi_free_GuestDiskAddressList(list);
969 static void build_guest_fsinfo_for_device(char const *devpath,
970 GuestFilesystemInfo *fs,
973 /* Store a list of slave devices of virtual volume specified by @syspath into
975 static void build_guest_fsinfo_for_virtual_device(char const *syspath,
976 GuestFilesystemInfo *fs,
981 struct dirent *entry;
983 dirpath = g_strdup_printf("%s/slaves", syspath);
984 dir = opendir(dirpath);
986 error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
993 entry = readdir(dir);
996 error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath);
1001 if (entry->d_type == DT_LNK) {
1004 g_debug(" slave device '%s'", entry->d_name);
1005 path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
1006 build_guest_fsinfo_for_device(path, fs, errp);
1019 /* Dispatch to functions for virtual/real device */
1020 static void build_guest_fsinfo_for_device(char const *devpath,
1021 GuestFilesystemInfo *fs,
1024 char *syspath = realpath(devpath, NULL);
1027 error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
1032 fs->name = g_strdup(basename(syspath));
1035 g_debug(" parse sysfs path '%s'", syspath);
1037 if (strstr(syspath, "/devices/virtual/block/")) {
1038 build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
1040 build_guest_fsinfo_for_real_device(syspath, fs, errp);
1046 /* Return a list of the disk device(s)' info which @mount lies on */
1047 static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
1050 GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
1051 char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
1052 mount->devmajor, mount->devminor);
1054 fs->mountpoint = g_strdup(mount->dirname);
1055 fs->type = g_strdup(mount->devtype);
1056 build_guest_fsinfo_for_device(devpath, fs, errp);
1062 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
1065 struct FsMount *mount;
1066 GuestFilesystemInfoList *new, *ret = NULL;
1067 Error *local_err = NULL;
1069 QTAILQ_INIT(&mounts);
1070 build_fs_mount_list(&mounts, &local_err);
1072 error_propagate(errp, local_err);
1076 QTAILQ_FOREACH(mount, &mounts, next) {
1077 g_debug("Building guest fsinfo for '%s'", mount->dirname);
1079 new = g_malloc0(sizeof(*ret));
1080 new->value = build_guest_fsinfo(mount, &local_err);
1084 error_propagate(errp, local_err);
1085 qapi_free_GuestFilesystemInfoList(ret);
1091 free_fs_mount_list(&mounts);
1097 FSFREEZE_HOOK_THAW = 0,
1098 FSFREEZE_HOOK_FREEZE,
1101 static const char *fsfreeze_hook_arg_string[] = {
1106 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
1111 const char *arg_str = fsfreeze_hook_arg_string[arg];
1112 Error *local_err = NULL;
1114 hook = ga_fsfreeze_hook(ga_state);
1118 if (access(hook, X_OK) != 0) {
1119 error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
1123 slog("executing fsfreeze hook with arg '%s'", arg_str);
1127 reopen_fd_to_null(0);
1128 reopen_fd_to_null(1);
1129 reopen_fd_to_null(2);
1131 execle(hook, hook, arg_str, NULL, environ);
1132 _exit(EXIT_FAILURE);
1133 } else if (pid < 0) {
1134 error_setg_errno(errp, errno, "failed to create child process");
1138 ga_wait_child(pid, &status, &local_err);
1140 error_propagate(errp, local_err);
1144 if (!WIFEXITED(status)) {
1145 error_setg(errp, "fsfreeze hook has terminated abnormally");
1149 status = WEXITSTATUS(status);
1151 error_setg(errp, "fsfreeze hook has failed with status %d", status);
1157 * Return status of freeze/thaw
1159 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
1161 if (ga_is_frozen(ga_state)) {
1162 return GUEST_FSFREEZE_STATUS_FROZEN;
1165 return GUEST_FSFREEZE_STATUS_THAWED;
1168 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
1170 return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
1174 * Walk list of mounted file systems in the guest, and freeze the ones which
1175 * are real local file systems.
1177 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
1178 strList *mountpoints,
1184 struct FsMount *mount;
1185 Error *local_err = NULL;
1188 slog("guest-fsfreeze called");
1190 execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
1192 error_propagate(errp, local_err);
1196 QTAILQ_INIT(&mounts);
1197 build_fs_mount_list(&mounts, &local_err);
1199 error_propagate(errp, local_err);
1203 /* cannot risk guest agent blocking itself on a write in this state */
1204 ga_set_frozen(ga_state);
1206 QTAILQ_FOREACH_REVERSE(mount, &mounts, FsMountList, next) {
1207 /* To issue fsfreeze in the reverse order of mounts, check if the
1208 * mount is listed in the list here */
1209 if (has_mountpoints) {
1210 for (list = mountpoints; list; list = list->next) {
1211 if (strcmp(list->value, mount->dirname) == 0) {
1220 fd = qemu_open(mount->dirname, O_RDONLY);
1222 error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
1226 /* we try to cull filesytems we know won't work in advance, but other
1227 * filesytems may not implement fsfreeze for less obvious reasons.
1228 * these will report EOPNOTSUPP. we simply ignore these when tallying
1229 * the number of frozen filesystems.
1231 * any other error means a failure to freeze a filesystem we
1232 * expect to be freezable, so return an error in those cases
1233 * and return system to thawed state.
1235 ret = ioctl(fd, FIFREEZE);
1237 if (errno != EOPNOTSUPP) {
1238 error_setg_errno(errp, errno, "failed to freeze %s",
1249 free_fs_mount_list(&mounts);
1253 free_fs_mount_list(&mounts);
1254 qmp_guest_fsfreeze_thaw(NULL);
1259 * Walk list of frozen file systems in the guest, and thaw them.
1261 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
1266 int fd, i = 0, logged;
1267 Error *local_err = NULL;
1269 QTAILQ_INIT(&mounts);
1270 build_fs_mount_list(&mounts, &local_err);
1272 error_propagate(errp, local_err);
1276 QTAILQ_FOREACH(mount, &mounts, next) {
1278 fd = qemu_open(mount->dirname, O_RDONLY);
1282 /* we have no way of knowing whether a filesystem was actually unfrozen
1283 * as a result of a successful call to FITHAW, only that if an error
1284 * was returned the filesystem was *not* unfrozen by that particular
1287 * since multiple preceding FIFREEZEs require multiple calls to FITHAW
1288 * to unfreeze, continuing issuing FITHAW until an error is returned,
1289 * in which case either the filesystem is in an unfreezable state, or,
1290 * more likely, it was thawed previously (and remains so afterward).
1292 * also, since the most recent successful call is the one that did
1293 * the actual unfreeze, we can use this to provide an accurate count
1294 * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
1295 * may * be useful for determining whether a filesystem was unfrozen
1296 * during the freeze/thaw phase by a process other than qemu-ga.
1299 ret = ioctl(fd, FITHAW);
1300 if (ret == 0 && !logged) {
1308 ga_unset_frozen(ga_state);
1309 free_fs_mount_list(&mounts);
1311 execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
1316 static void guest_fsfreeze_cleanup(void)
1320 if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
1321 qmp_guest_fsfreeze_thaw(&err);
1323 slog("failed to clean up frozen filesystems: %s",
1324 error_get_pretty(err));
1329 #endif /* CONFIG_FSFREEZE */
1331 #if defined(CONFIG_FSTRIM)
1333 * Walk list of mounted file systems in the guest, and trim them.
1335 GuestFilesystemTrimResponse *
1336 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
1338 GuestFilesystemTrimResponse *response;
1339 GuestFilesystemTrimResultList *list;
1340 GuestFilesystemTrimResult *result;
1343 struct FsMount *mount;
1345 Error *local_err = NULL;
1346 struct fstrim_range r;
1348 slog("guest-fstrim called");
1350 QTAILQ_INIT(&mounts);
1351 build_fs_mount_list(&mounts, &local_err);
1353 error_propagate(errp, local_err);
1357 response = g_malloc0(sizeof(*response));
1359 QTAILQ_FOREACH(mount, &mounts, next) {
1360 result = g_malloc0(sizeof(*result));
1361 result->path = g_strdup(mount->dirname);
1363 list = g_malloc0(sizeof(*list));
1364 list->value = result;
1365 list->next = response->paths;
1366 response->paths = list;
1368 fd = qemu_open(mount->dirname, O_RDONLY);
1370 result->error = g_strdup_printf("failed to open: %s",
1372 result->has_error = true;
1376 /* We try to cull filesytems we know won't work in advance, but other
1377 * filesytems may not implement fstrim for less obvious reasons. These
1378 * will report EOPNOTSUPP; while in some other cases ENOTTY will be
1379 * reported (e.g. CD-ROMs).
1380 * Any other error means an unexpected error.
1384 r.minlen = has_minimum ? minimum : 0;
1385 ret = ioctl(fd, FITRIM, &r);
1387 result->has_error = true;
1388 if (errno == ENOTTY || errno == EOPNOTSUPP) {
1389 result->error = g_strdup("trim not supported");
1391 result->error = g_strdup_printf("failed to trim: %s",
1398 result->has_minimum = true;
1399 result->minimum = r.minlen;
1400 result->has_trimmed = true;
1401 result->trimmed = r.len;
1405 free_fs_mount_list(&mounts);
1408 #endif /* CONFIG_FSTRIM */
1411 #define LINUX_SYS_STATE_FILE "/sys/power/state"
1412 #define SUSPEND_SUPPORTED 0
1413 #define SUSPEND_NOT_SUPPORTED 1
1415 static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
1416 const char *sysfile_str, Error **errp)
1418 Error *local_err = NULL;
1423 pmutils_path = g_find_program_in_path(pmutils_bin);
1427 char buf[32]; /* hopefully big enough */
1432 reopen_fd_to_null(0);
1433 reopen_fd_to_null(1);
1434 reopen_fd_to_null(2);
1437 execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
1441 * If we get here either pm-utils is not installed or execle() has
1442 * failed. Let's try the manual method if the caller wants it.
1446 _exit(SUSPEND_NOT_SUPPORTED);
1449 fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
1451 _exit(SUSPEND_NOT_SUPPORTED);
1454 ret = read(fd, buf, sizeof(buf)-1);
1456 _exit(SUSPEND_NOT_SUPPORTED);
1460 if (strstr(buf, sysfile_str)) {
1461 _exit(SUSPEND_SUPPORTED);
1464 _exit(SUSPEND_NOT_SUPPORTED);
1465 } else if (pid < 0) {
1466 error_setg_errno(errp, errno, "failed to create child process");
1470 ga_wait_child(pid, &status, &local_err);
1472 error_propagate(errp, local_err);
1476 if (!WIFEXITED(status)) {
1477 error_setg(errp, "child process has terminated abnormally");
1481 switch (WEXITSTATUS(status)) {
1482 case SUSPEND_SUPPORTED:
1484 case SUSPEND_NOT_SUPPORTED:
1486 "the requested suspend mode is not supported by the guest");
1490 "the helper program '%s' returned an unexpected exit status"
1491 " code (%d)", pmutils_path, WEXITSTATUS(status));
1496 g_free(pmutils_path);
1499 static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
1502 Error *local_err = NULL;
1507 pmutils_path = g_find_program_in_path(pmutils_bin);
1515 reopen_fd_to_null(0);
1516 reopen_fd_to_null(1);
1517 reopen_fd_to_null(2);
1520 execle(pmutils_path, pmutils_bin, NULL, environ);
1524 * If we get here either pm-utils is not installed or execle() has
1525 * failed. Let's try the manual method if the caller wants it.
1529 _exit(EXIT_FAILURE);
1532 fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
1534 _exit(EXIT_FAILURE);
1537 if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
1538 _exit(EXIT_FAILURE);
1541 _exit(EXIT_SUCCESS);
1542 } else if (pid < 0) {
1543 error_setg_errno(errp, errno, "failed to create child process");
1547 ga_wait_child(pid, &status, &local_err);
1549 error_propagate(errp, local_err);
1553 if (!WIFEXITED(status)) {
1554 error_setg(errp, "child process has terminated abnormally");
1558 if (WEXITSTATUS(status)) {
1559 error_setg(errp, "child process has failed to suspend");
1564 g_free(pmutils_path);
1567 void qmp_guest_suspend_disk(Error **errp)
1569 Error *local_err = NULL;
1571 bios_supports_mode("pm-is-supported", "--hibernate", "disk", &local_err);
1573 error_propagate(errp, local_err);
1577 guest_suspend("pm-hibernate", "disk", errp);
1580 void qmp_guest_suspend_ram(Error **errp)
1582 Error *local_err = NULL;
1584 bios_supports_mode("pm-is-supported", "--suspend", "mem", &local_err);
1586 error_propagate(errp, local_err);
1590 guest_suspend("pm-suspend", "mem", errp);
1593 void qmp_guest_suspend_hybrid(Error **errp)
1595 Error *local_err = NULL;
1597 bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL,
1600 error_propagate(errp, local_err);
1604 guest_suspend("pm-suspend-hybrid", NULL, errp);
1607 static GuestNetworkInterfaceList *
1608 guest_find_interface(GuestNetworkInterfaceList *head,
1611 for (; head; head = head->next) {
1612 if (strcmp(head->value->name, name) == 0) {
1621 * Build information about guest interfaces
1623 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
1625 GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
1626 struct ifaddrs *ifap, *ifa;
1628 if (getifaddrs(&ifap) < 0) {
1629 error_setg_errno(errp, errno, "getifaddrs failed");
1633 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1634 GuestNetworkInterfaceList *info;
1635 GuestIpAddressList **address_list = NULL, *address_item = NULL;
1636 char addr4[INET_ADDRSTRLEN];
1637 char addr6[INET6_ADDRSTRLEN];
1640 unsigned char *mac_addr;
1643 g_debug("Processing %s interface", ifa->ifa_name);
1645 info = guest_find_interface(head, ifa->ifa_name);
1648 info = g_malloc0(sizeof(*info));
1649 info->value = g_malloc0(sizeof(*info->value));
1650 info->value->name = g_strdup(ifa->ifa_name);
1653 head = cur_item = info;
1655 cur_item->next = info;
1660 if (!info->value->has_hardware_address &&
1661 ifa->ifa_flags & SIOCGIFHWADDR) {
1662 /* we haven't obtained HW address yet */
1663 sock = socket(PF_INET, SOCK_STREAM, 0);
1665 error_setg_errno(errp, errno, "failed to create socket");
1669 memset(&ifr, 0, sizeof(ifr));
1670 pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name);
1671 if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
1672 error_setg_errno(errp, errno,
1673 "failed to get MAC address of %s",
1680 mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
1682 info->value->hardware_address =
1683 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
1684 (int) mac_addr[0], (int) mac_addr[1],
1685 (int) mac_addr[2], (int) mac_addr[3],
1686 (int) mac_addr[4], (int) mac_addr[5]);
1688 info->value->has_hardware_address = true;
1691 if (ifa->ifa_addr &&
1692 ifa->ifa_addr->sa_family == AF_INET) {
1693 /* interface with IPv4 address */
1694 p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
1695 if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
1696 error_setg_errno(errp, errno, "inet_ntop failed");
1700 address_item = g_malloc0(sizeof(*address_item));
1701 address_item->value = g_malloc0(sizeof(*address_item->value));
1702 address_item->value->ip_address = g_strdup(addr4);
1703 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
1705 if (ifa->ifa_netmask) {
1706 /* Count the number of set bits in netmask.
1707 * This is safe as '1' and '0' cannot be shuffled in netmask. */
1708 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
1709 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
1711 } else if (ifa->ifa_addr &&
1712 ifa->ifa_addr->sa_family == AF_INET6) {
1713 /* interface with IPv6 address */
1714 p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
1715 if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
1716 error_setg_errno(errp, errno, "inet_ntop failed");
1720 address_item = g_malloc0(sizeof(*address_item));
1721 address_item->value = g_malloc0(sizeof(*address_item->value));
1722 address_item->value->ip_address = g_strdup(addr6);
1723 address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
1725 if (ifa->ifa_netmask) {
1726 /* Count the number of set bits in netmask.
1727 * This is safe as '1' and '0' cannot be shuffled in netmask. */
1728 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
1729 address_item->value->prefix =
1730 ctpop32(((uint32_t *) p)[0]) +
1731 ctpop32(((uint32_t *) p)[1]) +
1732 ctpop32(((uint32_t *) p)[2]) +
1733 ctpop32(((uint32_t *) p)[3]);
1737 if (!address_item) {
1741 address_list = &info->value->ip_addresses;
1743 while (*address_list && (*address_list)->next) {
1744 address_list = &(*address_list)->next;
1747 if (!*address_list) {
1748 *address_list = address_item;
1750 (*address_list)->next = address_item;
1753 info->value->has_ip_addresses = true;
1763 qapi_free_GuestNetworkInterfaceList(head);
1767 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp))
1769 static long sysconf_exact(int name, const char *name_str, Error **errp)
1774 ret = sysconf(name);
1777 error_setg(errp, "sysconf(%s): value indefinite", name_str);
1779 error_setg_errno(errp, errno, "sysconf(%s)", name_str);
1785 /* Transfer online/offline status between @vcpu and the guest system.
1787 * On input either @errp or *@errp must be NULL.
1789 * In system-to-@vcpu direction, the following @vcpu fields are accessed:
1790 * - R: vcpu->logical_id
1792 * - W: vcpu->can_offline
1794 * In @vcpu-to-system direction, the following @vcpu fields are accessed:
1795 * - R: vcpu->logical_id
1798 * Written members remain unmodified on error.
1800 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
1806 dirpath = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
1808 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
1810 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
1812 static const char fn[] = "online";
1816 fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
1818 if (errno != ENOENT) {
1819 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
1820 } else if (sys2vcpu) {
1821 vcpu->online = true;
1822 vcpu->can_offline = false;
1823 } else if (!vcpu->online) {
1824 error_setg(errp, "logical processor #%" PRId64 " can't be "
1825 "offlined", vcpu->logical_id);
1826 } /* otherwise pretend successful re-onlining */
1828 unsigned char status;
1830 res = pread(fd, &status, 1, 0);
1832 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
1833 } else if (res == 0) {
1834 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
1836 } else if (sys2vcpu) {
1837 vcpu->online = (status != '0');
1838 vcpu->can_offline = true;
1839 } else if (vcpu->online != (status != '0')) {
1840 status = '0' + vcpu->online;
1841 if (pwrite(fd, &status, 1, 0) == -1) {
1842 error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
1845 } /* otherwise pretend successful re-(on|off)-lining */
1858 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
1861 GuestLogicalProcessorList *head, **link;
1863 Error *local_err = NULL;
1868 sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
1870 while (local_err == NULL && current < sc_max) {
1871 GuestLogicalProcessor *vcpu;
1872 GuestLogicalProcessorList *entry;
1874 vcpu = g_malloc0(sizeof *vcpu);
1875 vcpu->logical_id = current++;
1876 vcpu->has_can_offline = true; /* lolspeak ftw */
1877 transfer_vcpu(vcpu, true, &local_err);
1879 entry = g_malloc0(sizeof *entry);
1880 entry->value = vcpu;
1883 link = &entry->next;
1886 if (local_err == NULL) {
1887 /* there's no guest with zero VCPUs */
1888 g_assert(head != NULL);
1892 qapi_free_GuestLogicalProcessorList(head);
1893 error_propagate(errp, local_err);
1897 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
1900 Error *local_err = NULL;
1903 while (vcpus != NULL) {
1904 transfer_vcpu(vcpus->value, false, &local_err);
1905 if (local_err != NULL) {
1909 vcpus = vcpus->next;
1912 if (local_err != NULL) {
1913 if (processed == 0) {
1914 error_propagate(errp, local_err);
1916 error_free(local_err);
1923 void qmp_guest_set_user_password(const char *username,
1924 const char *password,
1928 Error *local_err = NULL;
1929 char *passwd_path = NULL;
1932 int datafd[2] = { -1, -1 };
1933 char *rawpasswddata = NULL;
1934 size_t rawpasswdlen;
1935 char *chpasswddata = NULL;
1938 rawpasswddata = (char *)g_base64_decode(password, &rawpasswdlen);
1939 rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1);
1940 rawpasswddata[rawpasswdlen] = '\0';
1942 if (strchr(rawpasswddata, '\n')) {
1943 error_setg(errp, "forbidden characters in raw password");
1947 if (strchr(username, '\n') ||
1948 strchr(username, ':')) {
1949 error_setg(errp, "forbidden characters in username");
1953 chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata);
1954 chpasswdlen = strlen(chpasswddata);
1956 passwd_path = g_find_program_in_path("chpasswd");
1959 error_setg(errp, "cannot find 'passwd' program in PATH");
1963 if (pipe(datafd) < 0) {
1964 error_setg(errp, "cannot create pipe FDs");
1974 reopen_fd_to_null(1);
1975 reopen_fd_to_null(2);
1978 execle(passwd_path, "chpasswd", "-e", NULL, environ);
1980 execle(passwd_path, "chpasswd", NULL, environ);
1982 _exit(EXIT_FAILURE);
1983 } else if (pid < 0) {
1984 error_setg_errno(errp, errno, "failed to create child process");
1990 if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) {
1991 error_setg_errno(errp, errno, "cannot write new account password");
1997 ga_wait_child(pid, &status, &local_err);
1999 error_propagate(errp, local_err);
2003 if (!WIFEXITED(status)) {
2004 error_setg(errp, "child process has terminated abnormally");
2008 if (WEXITSTATUS(status)) {
2009 error_setg(errp, "child process has failed to set user password");
2014 g_free(chpasswddata);
2015 g_free(rawpasswddata);
2016 g_free(passwd_path);
2017 if (datafd[0] != -1) {
2020 if (datafd[1] != -1) {
2025 static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
2026 int size, Error **errp)
2032 fd = openat(dirfd, pathname, O_RDONLY);
2034 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2038 res = pread(fd, buf, size, 0);
2040 error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
2041 } else if (res == 0) {
2042 error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
2047 static void ga_write_sysfs_file(int dirfd, const char *pathname,
2048 const char *buf, int size, Error **errp)
2053 fd = openat(dirfd, pathname, O_WRONLY);
2055 error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
2059 if (pwrite(fd, buf, size, 0) == -1) {
2060 error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
2066 /* Transfer online/offline status between @mem_blk and the guest system.
2068 * On input either @errp or *@errp must be NULL.
2070 * In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
2071 * - R: mem_blk->phys_index
2072 * - W: mem_blk->online
2073 * - W: mem_blk->can_offline
2075 * In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
2076 * - R: mem_blk->phys_index
2077 * - R: mem_blk->online
2078 *- R: mem_blk->can_offline
2079 * Written members remain unmodified on error.
2081 static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
2082 GuestMemoryBlockResponse *result,
2088 Error *local_err = NULL;
2094 error_setg(errp, "Internal error, 'result' should not be NULL");
2098 dp = opendir("/sys/devices/system/memory/");
2099 /* if there is no 'memory' directory in sysfs,
2100 * we think this VM does not support online/offline memory block,
2101 * any other solution?
2103 if (!dp && errno == ENOENT) {
2105 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2111 dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
2112 mem_blk->phys_index);
2113 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2116 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2118 if (errno == ENOENT) {
2119 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
2122 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2130 status = g_malloc0(10);
2131 ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
2133 /* treat with sysfs file that not exist in old kernel */
2134 if (errno == ENOENT) {
2135 error_free(local_err);
2137 mem_blk->online = true;
2138 mem_blk->can_offline = false;
2139 } else if (!mem_blk->online) {
2141 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
2145 error_propagate(errp, local_err);
2148 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2155 char removable = '0';
2157 mem_blk->online = (strncmp(status, "online", 6) == 0);
2159 ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
2161 /* if no 'removable' file, it does't support offline mem blk */
2162 if (errno == ENOENT) {
2163 error_free(local_err);
2164 mem_blk->can_offline = false;
2166 error_propagate(errp, local_err);
2169 mem_blk->can_offline = (removable != '0');
2172 if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
2173 char *new_state = mem_blk->online ? g_strdup("online") :
2174 g_strdup("offline");
2176 ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
2180 error_free(local_err);
2182 GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
2186 result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
2187 result->has_error_code = false;
2188 } /* otherwise pretend successful re-(on|off)-lining */
2199 result->has_error_code = true;
2200 result->error_code = errno;
2204 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2206 GuestMemoryBlockList *head, **link;
2207 Error *local_err = NULL;
2214 dp = opendir("/sys/devices/system/memory/");
2216 error_setg_errno(errp, errno, "Can't open directory"
2217 "\"/sys/devices/system/memory/\"\n");
2221 /* Note: the phys_index of memory block may be discontinuous,
2222 * this is because a memblk is the unit of the Sparse Memory design, which
2223 * allows discontinuous memory ranges (ex. NUMA), so here we should
2224 * traverse the memory block directory.
2226 while ((de = readdir(dp)) != NULL) {
2227 GuestMemoryBlock *mem_blk;
2228 GuestMemoryBlockList *entry;
2230 if ((strncmp(de->d_name, "memory", 6) != 0) ||
2231 !(de->d_type & DT_DIR)) {
2235 mem_blk = g_malloc0(sizeof *mem_blk);
2236 /* The d_name is "memoryXXX", phys_index is block id, same as XXX */
2237 mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
2238 mem_blk->has_can_offline = true; /* lolspeak ftw */
2239 transfer_memory_block(mem_blk, true, NULL, &local_err);
2241 entry = g_malloc0(sizeof *entry);
2242 entry->value = mem_blk;
2245 link = &entry->next;
2249 if (local_err == NULL) {
2250 /* there's no guest with zero memory blocks */
2252 error_setg(errp, "guest reported zero memory blocks!");
2257 qapi_free_GuestMemoryBlockList(head);
2258 error_propagate(errp, local_err);
2262 GuestMemoryBlockResponseList *
2263 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2265 GuestMemoryBlockResponseList *head, **link;
2266 Error *local_err = NULL;
2271 while (mem_blks != NULL) {
2272 GuestMemoryBlockResponse *result;
2273 GuestMemoryBlockResponseList *entry;
2274 GuestMemoryBlock *current_mem_blk = mem_blks->value;
2276 result = g_malloc0(sizeof(*result));
2277 result->phys_index = current_mem_blk->phys_index;
2278 transfer_memory_block(current_mem_blk, false, result, &local_err);
2279 if (local_err) { /* should never happen */
2282 entry = g_malloc0(sizeof *entry);
2283 entry->value = result;
2286 link = &entry->next;
2287 mem_blks = mem_blks->next;
2292 qapi_free_GuestMemoryBlockResponseList(head);
2293 error_propagate(errp, local_err);
2297 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2299 Error *local_err = NULL;
2303 GuestMemoryBlockInfo *info;
2305 dirpath = g_strdup_printf("/sys/devices/system/memory/");
2306 dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
2308 error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
2314 buf = g_malloc0(20);
2315 ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
2319 error_propagate(errp, local_err);
2323 info = g_new0(GuestMemoryBlockInfo, 1);
2324 info->size = strtol(buf, NULL, 16); /* the unit is bytes */
2331 #else /* defined(__linux__) */
2333 void qmp_guest_suspend_disk(Error **errp)
2335 error_setg(errp, QERR_UNSUPPORTED);
2338 void qmp_guest_suspend_ram(Error **errp)
2340 error_setg(errp, QERR_UNSUPPORTED);
2343 void qmp_guest_suspend_hybrid(Error **errp)
2345 error_setg(errp, QERR_UNSUPPORTED);
2348 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
2350 error_setg(errp, QERR_UNSUPPORTED);
2354 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
2356 error_setg(errp, QERR_UNSUPPORTED);
2360 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
2362 error_setg(errp, QERR_UNSUPPORTED);
2366 void qmp_guest_set_user_password(const char *username,
2367 const char *password,
2371 error_setg(errp, QERR_UNSUPPORTED);
2374 GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
2376 error_setg(errp, QERR_UNSUPPORTED);
2380 GuestMemoryBlockResponseList *
2381 qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
2383 error_setg(errp, QERR_UNSUPPORTED);
2387 GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
2389 error_setg(errp, QERR_UNSUPPORTED);
2395 #if !defined(CONFIG_FSFREEZE)
2397 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
2399 error_setg(errp, QERR_UNSUPPORTED);
2403 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
2405 error_setg(errp, QERR_UNSUPPORTED);
2410 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
2412 error_setg(errp, QERR_UNSUPPORTED);
2417 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
2418 strList *mountpoints,
2421 error_setg(errp, QERR_UNSUPPORTED);
2426 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
2428 error_setg(errp, QERR_UNSUPPORTED);
2432 #endif /* CONFIG_FSFREEZE */
2434 #if !defined(CONFIG_FSTRIM)
2435 GuestFilesystemTrimResponse *
2436 qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
2438 error_setg(errp, QERR_UNSUPPORTED);
2443 /* add unsupported commands to the blacklist */
2444 GList *ga_command_blacklist_init(GList *blacklist)
2446 #if !defined(__linux__)
2448 const char *list[] = {
2449 "guest-suspend-disk", "guest-suspend-ram",
2450 "guest-suspend-hybrid", "guest-network-get-interfaces",
2451 "guest-get-vcpus", "guest-set-vcpus",
2452 "guest-get-memory-blocks", "guest-set-memory-blocks",
2453 "guest-get-memory-block-size", NULL};
2454 char **p = (char **)list;
2457 blacklist = g_list_append(blacklist, *p++);
2462 #if !defined(CONFIG_FSFREEZE)
2464 const char *list[] = {
2465 "guest-get-fsinfo", "guest-fsfreeze-status",
2466 "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list",
2467 "guest-fsfreeze-thaw", "guest-get-fsinfo", NULL};
2468 char **p = (char **)list;
2471 blacklist = g_list_append(blacklist, *p++);
2476 #if !defined(CONFIG_FSTRIM)
2477 blacklist = g_list_append(blacklist, (char *)"guest-fstrim");
2483 /* register init/cleanup routines for stateful command groups */
2484 void ga_command_state_init(GAState *s, GACommandState *cs)
2486 #if defined(CONFIG_FSFREEZE)
2487 ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
2489 ga_command_state_add(cs, guest_file_init, NULL);