Add qemu 2.4.0

Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>

1 files changed, 2490 insertions, 0 deletions

diff --git a/qemu/qga/commands-posix.c b/qemu/qga/commands-posix.c
new file mode 100644
index 000000000..675f4b4c6
--- /dev/null
+++ b/qemu/qga/commands-posix.c
@@ -0,0 +1,2490 @@
+/*
+ * QEMU Guest Agent POSIX-specific command implementations
+ *
+ * Copyright IBM Corp. 2011
+ *
+ * Authors:
+ *  Michael Roth      <mdroth@linux.vnet.ibm.com>
+ *  Michal Privoznik  <mprivozn@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <glib.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <inttypes.h>
+#include "qga/guest-agent-core.h"
+#include "qga-qmp-commands.h"
+#include "qapi/qmp/qerror.h"
+#include "qemu/queue.h"
+#include "qemu/host-utils.h"
+
+#ifndef CONFIG_HAS_ENVIRON
+#ifdef __APPLE__
+#include <crt_externs.h>
+#define environ (*_NSGetEnviron())
+#else
+extern char **environ;
+#endif
+#endif
+
+#if defined(__linux__)
+#include <mntent.h>
+#include <linux/fs.h>
+#include <ifaddrs.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <net/if.h>
+
+#ifdef FIFREEZE
+#define CONFIG_FSFREEZE
+#endif
+#ifdef FITRIM
+#define CONFIG_FSTRIM
+#endif
+#endif
+
+static void ga_wait_child(pid_t pid, int *status, Error **errp)
+{
+    pid_t rpid;
+
+    *status = 0;
+
+    do {
+        rpid = waitpid(pid, status, 0);
+    } while (rpid == -1 && errno == EINTR);
+
+    if (rpid == -1) {
+        error_setg_errno(errp, errno, "failed to wait for child (pid: %d)",
+                         pid);
+        return;
+    }
+
+    g_assert(rpid == pid);
+}
+
+void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
+{
+    const char *shutdown_flag;
+    Error *local_err = NULL;
+    pid_t pid;
+    int status;
+
+    slog("guest-shutdown called, mode: %s", mode);
+    if (!has_mode || strcmp(mode, "powerdown") == 0) {
+        shutdown_flag = "-P";
+    } else if (strcmp(mode, "halt") == 0) {
+        shutdown_flag = "-H";
+    } else if (strcmp(mode, "reboot") == 0) {
+        shutdown_flag = "-r";
+    } else {
+        error_setg(errp,
+                   "mode is invalid (valid values are: halt|powerdown|reboot");
+        return;
+    }
+
+    pid = fork();
+    if (pid == 0) {
+        /* child, start the shutdown */
+        setsid();
+        reopen_fd_to_null(0);
+        reopen_fd_to_null(1);
+        reopen_fd_to_null(2);
+
+        execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
+               "hypervisor initiated shutdown", (char*)NULL, environ);
+        _exit(EXIT_FAILURE);
+    } else if (pid < 0) {
+        error_setg_errno(errp, errno, "failed to create child process");
+        return;
+    }
+
+    ga_wait_child(pid, &status, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    if (!WIFEXITED(status)) {
+        error_setg(errp, "child process has terminated abnormally");
+        return;
+    }
+
+    if (WEXITSTATUS(status)) {
+        error_setg(errp, "child process has failed to shutdown");
+        return;
+    }
+
+    /* succeeded */
+}
+
+int64_t qmp_guest_get_time(Error **errp)
+{
+   int ret;
+   qemu_timeval tq;
+   int64_t time_ns;
+
+   ret = qemu_gettimeofday(&tq);
+   if (ret < 0) {
+       error_setg_errno(errp, errno, "Failed to get time");
+       return -1;
+   }
+
+   time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
+   return time_ns;
+}
+
+void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
+{
+    int ret;
+    int status;
+    pid_t pid;
+    Error *local_err = NULL;
+    struct timeval tv;
+
+    /* If user has passed a time, validate and set it. */
+    if (has_time) {
+        GDate date = { 0, };
+
+        /* year-2038 will overflow in case time_t is 32bit */
+        if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
+            error_setg(errp, "Time %" PRId64 " is too large", time_ns);
+            return;
+        }
+
+        tv.tv_sec = time_ns / 1000000000;
+        tv.tv_usec = (time_ns % 1000000000) / 1000;
+        g_date_set_time_t(&date, tv.tv_sec);
+        if (date.year < 1970 || date.year >= 2070) {
+            error_setg_errno(errp, errno, "Invalid time");
+            return;
+        }
+
+        ret = settimeofday(&tv, NULL);
+        if (ret < 0) {
+            error_setg_errno(errp, errno, "Failed to set time to guest");
+            return;
+        }
+    }
+
+    /* Now, if user has passed a time to set and the system time is set, we
+     * just need to synchronize the hardware clock. However, if no time was
+     * passed, user is requesting the opposite: set the system time from the
+     * hardware clock (RTC). */
+    pid = fork();
+    if (pid == 0) {
+        setsid();
+        reopen_fd_to_null(0);
+        reopen_fd_to_null(1);
+        reopen_fd_to_null(2);
+
+        /* Use '/sbin/hwclock -w' to set RTC from the system time,
+         * or '/sbin/hwclock -s' to set the system time from RTC. */
+        execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s",
+               NULL, environ);
+        _exit(EXIT_FAILURE);
+    } else if (pid < 0) {
+        error_setg_errno(errp, errno, "failed to create child process");
+        return;
+    }
+
+    ga_wait_child(pid, &status, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    if (!WIFEXITED(status)) {
+        error_setg(errp, "child process has terminated abnormally");
+        return;
+    }
+
+    if (WEXITSTATUS(status)) {
+        error_setg(errp, "hwclock failed to set hardware clock to system time");
+        return;
+    }
+}
+
+typedef struct GuestFileHandle {
+    uint64_t id;
+    FILE *fh;
+    QTAILQ_ENTRY(GuestFileHandle) next;
+} GuestFileHandle;
+
+static struct {
+    QTAILQ_HEAD(, GuestFileHandle) filehandles;
+} guest_file_state;
+
+static int64_t guest_file_handle_add(FILE *fh, Error **errp)
+{
+    GuestFileHandle *gfh;
+    int64_t handle;
+
+    handle = ga_get_fd_handle(ga_state, errp);
+    if (handle < 0) {
+        return -1;
+    }
+
+    gfh = g_malloc0(sizeof(GuestFileHandle));
+    gfh->id = handle;
+    gfh->fh = fh;
+    QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
+
+    return handle;
+}
+
+static GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp)
+{
+    GuestFileHandle *gfh;
+
+    QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
+    {
+        if (gfh->id == id) {
+            return gfh;
+        }
+    }
+
+    error_setg(errp, "handle '%" PRId64 "' has not been found", id);
+    return NULL;
+}
+
+typedef const char * const ccpc;
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+/* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */
+static const struct {
+    ccpc *forms;
+    int oflag_base;
+} guest_file_open_modes[] = {
+    { (ccpc[]){ "r",          NULL }, O_RDONLY                                 },
+    { (ccpc[]){ "rb",         NULL }, O_RDONLY                      | O_BINARY },
+    { (ccpc[]){ "w",          NULL }, O_WRONLY | O_CREAT | O_TRUNC             },
+    { (ccpc[]){ "wb",         NULL }, O_WRONLY | O_CREAT | O_TRUNC  | O_BINARY },
+    { (ccpc[]){ "a",          NULL }, O_WRONLY | O_CREAT | O_APPEND            },
+    { (ccpc[]){ "ab",         NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY },
+    { (ccpc[]){ "r+",         NULL }, O_RDWR                                   },
+    { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR                        | O_BINARY },
+    { (ccpc[]){ "w+",         NULL }, O_RDWR   | O_CREAT | O_TRUNC             },
+    { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR   | O_CREAT | O_TRUNC  | O_BINARY },
+    { (ccpc[]){ "a+",         NULL }, O_RDWR   | O_CREAT | O_APPEND            },
+    { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR   | O_CREAT | O_APPEND | O_BINARY }
+};
+
+static int
+find_open_flag(const char *mode_str, Error **errp)
+{
+    unsigned mode;
+
+    for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
+        ccpc *form;
+
+        form = guest_file_open_modes[mode].forms;
+        while (*form != NULL && strcmp(*form, mode_str) != 0) {
+            ++form;
+        }
+        if (*form != NULL) {
+            break;
+        }
+    }
+
+    if (mode == ARRAY_SIZE(guest_file_open_modes)) {
+        error_setg(errp, "invalid file open mode '%s'", mode_str);
+        return -1;
+    }
+    return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK;
+}
+
+#define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \
+                               S_IRGRP | S_IWGRP | \
+                               S_IROTH | S_IWOTH)
+
+static FILE *
+safe_open_or_create(const char *path, const char *mode, Error **errp)
+{
+    Error *local_err = NULL;
+    int oflag;
+
+    oflag = find_open_flag(mode, &local_err);
+    if (local_err == NULL) {
+        int fd;
+
+        /* If the caller wants / allows creation of a new file, we implement it
+         * with a two step process: open() + (open() / fchmod()).
+         *
+         * First we insist on creating the file exclusively as a new file. If
+         * that succeeds, we're free to set any file-mode bits on it. (The
+         * motivation is that we want to set those file-mode bits independently
+         * of the current umask.)
+         *
+         * If the exclusive creation fails because the file already exists
+         * (EEXIST is not possible for any other reason), we just attempt to
+         * open the file, but in this case we won't be allowed to change the
+         * file-mode bits on the preexistent file.
+         *
+         * The pathname should never disappear between the two open()s in
+         * practice. If it happens, then someone very likely tried to race us.
+         * In this case just go ahead and report the ENOENT from the second
+         * open() to the caller.
+         *
+         * If the caller wants to open a preexistent file, then the first
+         * open() is decisive and its third argument is ignored, and the second
+         * open() and the fchmod() are never called.
+         */
+        fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
+        if (fd == -1 && errno == EEXIST) {
+            oflag &= ~(unsigned)O_CREAT;
+            fd = open(path, oflag);
+        }
+
+        if (fd == -1) {
+            error_setg_errno(&local_err, errno, "failed to open file '%s' "
+                             "(mode: '%s')", path, mode);
+        } else {
+            qemu_set_cloexec(fd);
+
+            if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
+                error_setg_errno(&local_err, errno, "failed to set permission "
+                                 "0%03o on new file '%s' (mode: '%s')",
+                                 (unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
+            } else {
+                FILE *f;
+
+                f = fdopen(fd, mode);
+                if (f == NULL) {
+                    error_setg_errno(&local_err, errno, "failed to associate "
+                                     "stdio stream with file descriptor %d, "
+                                     "file '%s' (mode: '%s')", fd, path, mode);
+                } else {
+                    return f;
+                }
+            }
+
+            close(fd);
+            if (oflag & O_CREAT) {
+                unlink(path);
+            }
+        }
+    }
+
+    error_propagate(errp, local_err);
+    return NULL;
+}
+
+static int guest_file_toggle_flags(int fd, int flags, bool set, Error **err)
+{
+    int ret, old_flags;
+
+    old_flags = fcntl(fd, F_GETFL);
+    if (old_flags == -1) {
+        error_setg_errno(err, errno, QERR_QGA_COMMAND_FAILED,
+                         "failed to fetch filehandle flags");
+        return -1;
+    }
+
+    ret = fcntl(fd, F_SETFL, set ? (old_flags | flags) : (old_flags & ~flags));
+    if (ret == -1) {
+        error_setg_errno(err, errno, QERR_QGA_COMMAND_FAILED,
+                         "failed to set filehandle flags");
+        return -1;
+    }
+
+    return ret;
+}
+
+int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode,
+                            Error **errp)
+{
+    FILE *fh;
+    Error *local_err = NULL;
+    int64_t handle;
+
+    if (!has_mode) {
+        mode = "r";
+    }
+    slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
+    fh = safe_open_or_create(path, mode, &local_err);
+    if (local_err != NULL) {
+        error_propagate(errp, local_err);
+        return -1;
+    }
+
+    /* set fd non-blocking to avoid common use cases (like reading from a
+     * named pipe) from hanging the agent
+     */
+    if (guest_file_toggle_flags(fileno(fh), O_NONBLOCK, true, errp) < 0) {
+        fclose(fh);
+        return -1;
+    }
+
+    handle = guest_file_handle_add(fh, errp);
+    if (handle < 0) {
+        fclose(fh);
+        return -1;
+    }
+
+    slog("guest-file-open, handle: %" PRId64, handle);
+    return handle;
+}
+
+void qmp_guest_file_close(int64_t handle, Error **errp)
+{
+    GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
+    int ret;
+
+    slog("guest-file-close called, handle: %" PRId64, handle);
+    if (!gfh) {
+        return;
+    }
+
+    ret = fclose(gfh->fh);
+    if (ret == EOF) {
+        error_setg_errno(errp, errno, "failed to close handle");
+        return;
+    }
+
+    QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
+    g_free(gfh);
+}
+
+struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
+                                          int64_t count, Error **errp)
+{
+    GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
+    GuestFileRead *read_data = NULL;
+    guchar *buf;
+    FILE *fh;
+    size_t read_count;
+
+    if (!gfh) {
+        return NULL;
+    }
+
+    if (!has_count) {
+        count = QGA_READ_COUNT_DEFAULT;
+    } else if (count < 0) {
+        error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
+                   count);
+        return NULL;
+    }
+
+    fh = gfh->fh;
+    buf = g_malloc0(count+1);
+    read_count = fread(buf, 1, count, fh);
+    if (ferror(fh)) {
+        error_setg_errno(errp, errno, "failed to read file");
+        slog("guest-file-read failed, handle: %" PRId64, handle);
+    } else {
+        buf[read_count] = 0;
+        read_data = g_malloc0(sizeof(GuestFileRead));
+        read_data->count = read_count;
+        read_data->eof = feof(fh);
+        if (read_count) {
+            read_data->buf_b64 = g_base64_encode(buf, read_count);
+        }
+    }
+    g_free(buf);
+    clearerr(fh);
+
+    return read_data;
+}
+
+GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
+                                     bool has_count, int64_t count,
+                                     Error **errp)
+{
+    GuestFileWrite *write_data = NULL;
+    guchar *buf;
+    gsize buf_len;
+    int write_count;
+    GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
+    FILE *fh;
+
+    if (!gfh) {
+        return NULL;
+    }
+
+    fh = gfh->fh;
+    buf = g_base64_decode(buf_b64, &buf_len);
+
+    if (!has_count) {
+        count = buf_len;
+    } else if (count < 0 || count > buf_len) {
+        error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
+                   count);
+        g_free(buf);
+        return NULL;
+    }
+
+    write_count = fwrite(buf, 1, count, fh);
+    if (ferror(fh)) {
+        error_setg_errno(errp, errno, "failed to write to file");
+        slog("guest-file-write failed, handle: %" PRId64, handle);
+    } else {
+        write_data = g_malloc0(sizeof(GuestFileWrite));
+        write_data->count = write_count;
+        write_data->eof = feof(fh);
+    }
+    g_free(buf);
+    clearerr(fh);
+
+    return write_data;
+}
+
+struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
+                                          int64_t whence, Error **errp)
+{
+    GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
+    GuestFileSeek *seek_data = NULL;
+    FILE *fh;
+    int ret;
+
+    if (!gfh) {
+        return NULL;
+    }
+
+    fh = gfh->fh;
+    ret = fseek(fh, offset, whence);
+    if (ret == -1) {
+        error_setg_errno(errp, errno, "failed to seek file");
+    } else {
+        seek_data = g_new0(GuestFileSeek, 1);
+        seek_data->position = ftell(fh);
+        seek_data->eof = feof(fh);
+    }
+    clearerr(fh);
+
+    return seek_data;
+}
+
+void qmp_guest_file_flush(int64_t handle, Error **errp)
+{
+    GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
+    FILE *fh;
+    int ret;
+
+    if (!gfh) {
+        return;
+    }
+
+    fh = gfh->fh;
+    ret = fflush(fh);
+    if (ret == EOF) {
+        error_setg_errno(errp, errno, "failed to flush file");
+    }
+}
+
+static void guest_file_init(void)
+{
+    QTAILQ_INIT(&guest_file_state.filehandles);
+}
+
+/* linux-specific implementations. avoid this if at all possible. */
+#if defined(__linux__)
+
+#if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
+typedef struct FsMount {
+    char *dirname;
+    char *devtype;
+    unsigned int devmajor, devminor;
+    QTAILQ_ENTRY(FsMount) next;
+} FsMount;
+
+typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList;
+
+static void free_fs_mount_list(FsMountList *mounts)
+{
+     FsMount *mount, *temp;
+
+     if (!mounts) {
+         return;
+     }
+
+     QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
+         QTAILQ_REMOVE(mounts, mount, next);
+         g_free(mount->dirname);
+         g_free(mount->devtype);
+         g_free(mount);
+     }
+}
+
+static int dev_major_minor(const char *devpath,
+                           unsigned int *devmajor, unsigned int *devminor)
+{
+    struct stat st;
+
+    *devmajor = 0;
+    *devminor = 0;
+
+    if (stat(devpath, &st) < 0) {
+        slog("failed to stat device file '%s': %s", devpath, strerror(errno));
+        return -1;
+    }
+    if (S_ISDIR(st.st_mode)) {
+        /* It is bind mount */
+        return -2;
+    }
+    if (S_ISBLK(st.st_mode)) {
+        *devmajor = major(st.st_rdev);
+        *devminor = minor(st.st_rdev);
+        return 0;
+    }
+    return -1;
+}
+
+/*
+ * Walk the mount table and build a list of local file systems
+ */
+static void build_fs_mount_list_from_mtab(FsMountList *mounts, Error **errp)
+{
+    struct mntent *ment;
+    FsMount *mount;
+    char const *mtab = "/proc/self/mounts";
+    FILE *fp;
+    unsigned int devmajor, devminor;
+
+    fp = setmntent(mtab, "r");
+    if (!fp) {
+        error_setg(errp, "failed to open mtab file: '%s'", mtab);
+        return;
+    }
+
+    while ((ment = getmntent(fp))) {
+        /*
+         * An entry which device name doesn't start with a '/' is
+         * either a dummy file system or a network file system.
+         * Add special handling for smbfs and cifs as is done by
+         * coreutils as well.
+         */
+        if ((ment->mnt_fsname[0] != '/') ||
+            (strcmp(ment->mnt_type, "smbfs") == 0) ||
+            (strcmp(ment->mnt_type, "cifs") == 0)) {
+            continue;
+        }
+        if (dev_major_minor(ment->mnt_fsname, &devmajor, &devminor) == -2) {
+            /* Skip bind mounts */
+            continue;
+        }
+
+        mount = g_malloc0(sizeof(FsMount));
+        mount->dirname = g_strdup(ment->mnt_dir);
+        mount->devtype = g_strdup(ment->mnt_type);
+        mount->devmajor = devmajor;
+        mount->devminor = devminor;
+
+        QTAILQ_INSERT_TAIL(mounts, mount, next);
+    }
+
+    endmntent(fp);
+}
+
+static void decode_mntname(char *name, int len)
+{
+    int i, j = 0;
+    for (i = 0; i <= len; i++) {
+        if (name[i] != '\\') {
+            name[j++] = name[i];
+        } else if (name[i + 1] == '\\') {
+            name[j++] = '\\';
+            i++;
+        } else if (name[i + 1] >= '0' && name[i + 1] <= '3' &&
+                   name[i + 2] >= '0' && name[i + 2] <= '7' &&
+                   name[i + 3] >= '0' && name[i + 3] <= '7') {
+            name[j++] = (name[i + 1] - '0') * 64 +
+                        (name[i + 2] - '0') * 8 +
+                        (name[i + 3] - '0');
+            i += 3;
+        } else {
+            name[j++] = name[i];
+        }
+    }
+}
+
+static void build_fs_mount_list(FsMountList *mounts, Error **errp)
+{
+    FsMount *mount;
+    char const *mountinfo = "/proc/self/mountinfo";
+    FILE *fp;
+    char *line = NULL, *dash;
+    size_t n;
+    char check;
+    unsigned int devmajor, devminor;
+    int ret, dir_s, dir_e, type_s, type_e, dev_s, dev_e;
+
+    fp = fopen(mountinfo, "r");
+    if (!fp) {
+        build_fs_mount_list_from_mtab(mounts, errp);
+        return;
+    }
+
+    while (getline(&line, &n, fp) != -1) {
+        ret = sscanf(line, "%*u %*u %u:%u %*s %n%*s%n%c",
+                     &devmajor, &devminor, &dir_s, &dir_e, &check);
+        if (ret < 3) {
+            continue;
+        }
+        dash = strstr(line + dir_e, " - ");
+        if (!dash) {
+            continue;
+        }
+        ret = sscanf(dash, " - %n%*s%n %n%*s%n%c",
+                     &type_s, &type_e, &dev_s, &dev_e, &check);
+        if (ret < 1) {
+            continue;
+        }
+        line[dir_e] = 0;
+        dash[type_e] = 0;
+        dash[dev_e] = 0;
+        decode_mntname(line + dir_s, dir_e - dir_s);
+        decode_mntname(dash + dev_s, dev_e - dev_s);
+        if (devmajor == 0) {
+            /* btrfs reports major number = 0 */
+            if (strcmp("btrfs", dash + type_s) != 0 ||
+                dev_major_minor(dash + dev_s, &devmajor, &devminor) < 0) {
+                continue;
+            }
+        }
+
+        mount = g_malloc0(sizeof(FsMount));
+        mount->dirname = g_strdup(line + dir_s);
+        mount->devtype = g_strdup(dash + type_s);
+        mount->devmajor = devmajor;
+        mount->devminor = devminor;
+
+        QTAILQ_INSERT_TAIL(mounts, mount, next);
+    }
+    free(line);
+
+    fclose(fp);
+}
+#endif
+
+#if defined(CONFIG_FSFREEZE)
+
+static char *get_pci_driver(char const *syspath, int pathlen, Error **errp)
+{
+    char *path;
+    char *dpath;
+    char *driver = NULL;
+    char buf[PATH_MAX];
+    ssize_t len;
+
+    path = g_strndup(syspath, pathlen);
+    dpath = g_strdup_printf("%s/driver", path);
+    len = readlink(dpath, buf, sizeof(buf) - 1);
+    if (len != -1) {
+        buf[len] = 0;
+        driver = g_strdup(basename(buf));
+    }
+    g_free(dpath);
+    g_free(path);
+    return driver;
+}
+
+static int compare_uint(const void *_a, const void *_b)
+{
+    unsigned int a = *(unsigned int *)_a;
+    unsigned int b = *(unsigned int *)_b;
+
+    return a < b ? -1 : a > b ? 1 : 0;
+}
+
+/* Walk the specified sysfs and build a sorted list of host or ata numbers */
+static int build_hosts(char const *syspath, char const *host, bool ata,
+                       unsigned int *hosts, int hosts_max, Error **errp)
+{
+    char *path;
+    DIR *dir;
+    struct dirent *entry;
+    int i = 0;
+
+    path = g_strndup(syspath, host - syspath);
+    dir = opendir(path);
+    if (!dir) {
+        error_setg_errno(errp, errno, "opendir(\"%s\")", path);
+        g_free(path);
+        return -1;
+    }
+
+    while (i < hosts_max) {
+        entry = readdir(dir);
+        if (!entry) {
+            break;
+        }
+        if (ata && sscanf(entry->d_name, "ata%d", hosts + i) == 1) {
+            ++i;
+        } else if (!ata && sscanf(entry->d_name, "host%d", hosts + i) == 1) {
+            ++i;
+        }
+    }
+
+    qsort(hosts, i, sizeof(hosts[0]), compare_uint);
+
+    g_free(path);
+    closedir(dir);
+    return i;
+}
+
+/* Store disk device info specified by @sysfs into @fs */
+static void build_guest_fsinfo_for_real_device(char const *syspath,
+                                               GuestFilesystemInfo *fs,
+                                               Error **errp)
+{
+    unsigned int pci[4], host, hosts[8], tgt[3];
+    int i, nhosts = 0, pcilen;
+    GuestDiskAddress *disk;
+    GuestPCIAddress *pciaddr;
+    GuestDiskAddressList *list = NULL;
+    bool has_ata = false, has_host = false, has_tgt = false;
+    char *p, *q, *driver = NULL;
+
+    p = strstr(syspath, "/devices/pci");
+    if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
+                     pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
+        g_debug("only pci device is supported: sysfs path \"%s\"", syspath);
+        return;
+    }
+
+    driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp);
+    if (!driver) {
+        goto cleanup;
+    }
+
+    p = strstr(syspath, "/target");
+    if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
+                    tgt, tgt + 1, tgt + 2) == 3) {
+        has_tgt = true;
+    }
+
+    p = strstr(syspath, "/ata");
+    if (p) {
+        q = p + 4;
+        has_ata = true;
+    } else {
+        p = strstr(syspath, "/host");
+        q = p + 5;
+    }
+    if (p && sscanf(q, "%u", &host) == 1) {
+        has_host = true;
+        nhosts = build_hosts(syspath, p, has_ata, hosts,
+                             sizeof(hosts) / sizeof(hosts[0]), errp);
+        if (nhosts < 0) {
+            goto cleanup;
+        }
+    }
+
+    pciaddr = g_malloc0(sizeof(*pciaddr));
+    pciaddr->domain = pci[0];
+    pciaddr->bus = pci[1];
+    pciaddr->slot = pci[2];
+    pciaddr->function = pci[3];
+
+    disk = g_malloc0(sizeof(*disk));
+    disk->pci_controller = pciaddr;
+
+    list = g_malloc0(sizeof(*list));
+    list->value = disk;
+
+    if (strcmp(driver, "ata_piix") == 0) {
+        /* a host per ide bus, target*:0:<unit>:0 */
+        if (!has_host || !has_tgt) {
+            g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
+            goto cleanup;
+        }
+        for (i = 0; i < nhosts; i++) {
+            if (host == hosts[i]) {
+                disk->bus_type = GUEST_DISK_BUS_TYPE_IDE;
+                disk->bus = i;
+                disk->unit = tgt[1];
+                break;
+            }
+        }
+        if (i >= nhosts) {
+            g_debug("no host for '%s' (driver '%s')", syspath, driver);
+            goto cleanup;
+        }
+    } else if (strcmp(driver, "sym53c8xx") == 0) {
+        /* scsi(LSI Logic): target*:0:<unit>:0 */
+        if (!has_tgt) {
+            g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
+            goto cleanup;
+        }
+        disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
+        disk->unit = tgt[1];
+    } else if (strcmp(driver, "virtio-pci") == 0) {
+        if (has_tgt) {
+            /* virtio-scsi: target*:0:0:<unit> */
+            disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
+            disk->unit = tgt[2];
+        } else {
+            /* virtio-blk: 1 disk per 1 device */
+            disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
+        }
+    } else if (strcmp(driver, "ahci") == 0) {
+        /* ahci: 1 host per 1 unit */
+        if (!has_host || !has_tgt) {
+            g_debug("invalid sysfs path '%s' (driver '%s')", syspath, driver);
+            goto cleanup;
+        }
+        for (i = 0; i < nhosts; i++) {
+            if (host == hosts[i]) {
+                disk->unit = i;
+                disk->bus_type = GUEST_DISK_BUS_TYPE_SATA;
+                break;
+            }
+        }
+        if (i >= nhosts) {
+            g_debug("no host for '%s' (driver '%s')", syspath, driver);
+            goto cleanup;
+        }
+    } else {
+        g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
+        goto cleanup;
+    }
+
+    list->next = fs->disk;
+    fs->disk = list;
+    g_free(driver);
+    return;
+
+cleanup:
+    if (list) {
+        qapi_free_GuestDiskAddressList(list);
+    }
+    g_free(driver);
+}
+
+static void build_guest_fsinfo_for_device(char const *devpath,
+                                          GuestFilesystemInfo *fs,
+                                          Error **errp);
+
+/* Store a list of slave devices of virtual volume specified by @syspath into
+ * @fs */
+static void build_guest_fsinfo_for_virtual_device(char const *syspath,
+                                                  GuestFilesystemInfo *fs,
+                                                  Error **errp)
+{
+    DIR *dir;
+    char *dirpath;
+    struct dirent *entry;
+
+    dirpath = g_strdup_printf("%s/slaves", syspath);
+    dir = opendir(dirpath);
+    if (!dir) {
+        error_setg_errno(errp, errno, "opendir(\"%s\")", dirpath);
+        g_free(dirpath);
+        return;
+    }
+
+    for (;;) {
+        errno = 0;
+        entry = readdir(dir);
+        if (entry == NULL) {
+            if (errno) {
+                error_setg_errno(errp, errno, "readdir(\"%s\")", dirpath);
+            }
+            break;
+        }
+
+        if (entry->d_type == DT_LNK) {
+            char *path;
+
+            g_debug(" slave device '%s'", entry->d_name);
+            path = g_strdup_printf("%s/slaves/%s", syspath, entry->d_name);
+            build_guest_fsinfo_for_device(path, fs, errp);
+            g_free(path);
+
+            if (*errp) {
+                break;
+            }
+        }
+    }
+
+    g_free(dirpath);
+    closedir(dir);
+}
+
+/* Dispatch to functions for virtual/real device */
+static void build_guest_fsinfo_for_device(char const *devpath,
+                                          GuestFilesystemInfo *fs,
+                                          Error **errp)
+{
+    char *syspath = realpath(devpath, NULL);
+
+    if (!syspath) {
+        error_setg_errno(errp, errno, "realpath(\"%s\")", devpath);
+        return;
+    }
+
+    if (!fs->name) {
+        fs->name = g_strdup(basename(syspath));
+    }
+
+    g_debug("  parse sysfs path '%s'", syspath);
+
+    if (strstr(syspath, "/devices/virtual/block/")) {
+        build_guest_fsinfo_for_virtual_device(syspath, fs, errp);
+    } else {
+        build_guest_fsinfo_for_real_device(syspath, fs, errp);
+    }
+
+    free(syspath);
+}
+
+/* Return a list of the disk device(s)' info which @mount lies on */
+static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
+                                               Error **errp)
+{
+    GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
+    char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
+                                    mount->devmajor, mount->devminor);
+
+    fs->mountpoint = g_strdup(mount->dirname);
+    fs->type = g_strdup(mount->devtype);
+    build_guest_fsinfo_for_device(devpath, fs, errp);
+
+    g_free(devpath);
+    return fs;
+}
+
+GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
+{
+    FsMountList mounts;
+    struct FsMount *mount;
+    GuestFilesystemInfoList *new, *ret = NULL;
+    Error *local_err = NULL;
+
+    QTAILQ_INIT(&mounts);
+    build_fs_mount_list(&mounts, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return NULL;
+    }
+
+    QTAILQ_FOREACH(mount, &mounts, next) {
+        g_debug("Building guest fsinfo for '%s'", mount->dirname);
+
+        new = g_malloc0(sizeof(*ret));
+        new->value = build_guest_fsinfo(mount, &local_err);
+        new->next = ret;
+        ret = new;
+        if (local_err) {
+            error_propagate(errp, local_err);
+            qapi_free_GuestFilesystemInfoList(ret);
+            ret = NULL;
+            break;
+        }
+    }
+
+    free_fs_mount_list(&mounts);
+    return ret;
+}
+
+
+typedef enum {
+    FSFREEZE_HOOK_THAW = 0,
+    FSFREEZE_HOOK_FREEZE,
+} FsfreezeHookArg;
+
+static const char *fsfreeze_hook_arg_string[] = {
+    "thaw",
+    "freeze",
+};
+
+static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
+{
+    int status;
+    pid_t pid;
+    const char *hook;
+    const char *arg_str = fsfreeze_hook_arg_string[arg];
+    Error *local_err = NULL;
+
+    hook = ga_fsfreeze_hook(ga_state);
+    if (!hook) {
+        return;
+    }
+    if (access(hook, X_OK) != 0) {
+        error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
+        return;
+    }
+
+    slog("executing fsfreeze hook with arg '%s'", arg_str);
+    pid = fork();
+    if (pid == 0) {
+        setsid();
+        reopen_fd_to_null(0);
+        reopen_fd_to_null(1);
+        reopen_fd_to_null(2);
+
+        execle(hook, hook, arg_str, NULL, environ);
+        _exit(EXIT_FAILURE);
+    } else if (pid < 0) {
+        error_setg_errno(errp, errno, "failed to create child process");
+        return;
+    }
+
+    ga_wait_child(pid, &status, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    if (!WIFEXITED(status)) {
+        error_setg(errp, "fsfreeze hook has terminated abnormally");
+        return;
+    }
+
+    status = WEXITSTATUS(status);
+    if (status) {
+        error_setg(errp, "fsfreeze hook has failed with status %d", status);
+        return;
+    }
+}
+
+/*
+ * Return status of freeze/thaw
+ */
+GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
+{
+    if (ga_is_frozen(ga_state)) {
+        return GUEST_FSFREEZE_STATUS_FROZEN;
+    }
+
+    return GUEST_FSFREEZE_STATUS_THAWED;
+}
+
+int64_t qmp_guest_fsfreeze_freeze(Error **errp)
+{
+    return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
+}
+
+/*
+ * Walk list of mounted file systems in the guest, and freeze the ones which
+ * are real local file systems.
+ */
+int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
+                                       strList *mountpoints,
+                                       Error **errp)
+{
+    int ret = 0, i = 0;
+    strList *list;
+    FsMountList mounts;
+    struct FsMount *mount;
+    Error *local_err = NULL;
+    int fd;
+
+    slog("guest-fsfreeze called");
+
+    execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return -1;
+    }
+
+    QTAILQ_INIT(&mounts);
+    build_fs_mount_list(&mounts, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return -1;
+    }
+
+    /* cannot risk guest agent blocking itself on a write in this state */
+    ga_set_frozen(ga_state);
+
+    QTAILQ_FOREACH_REVERSE(mount, &mounts, FsMountList, next) {
+        /* To issue fsfreeze in the reverse order of mounts, check if the
+         * mount is listed in the list here */
+        if (has_mountpoints) {
+            for (list = mountpoints; list; list = list->next) {
+                if (strcmp(list->value, mount->dirname) == 0) {
+                    break;
+                }
+            }
+            if (!list) {
+                continue;
+            }
+        }
+
+        fd = qemu_open(mount->dirname, O_RDONLY);
+        if (fd == -1) {
+            error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
+            goto error;
+        }
+
+        /* we try to cull filesytems we know won't work in advance, but other
+         * filesytems may not implement fsfreeze for less obvious reasons.
+         * these will report EOPNOTSUPP. we simply ignore these when tallying
+         * the number of frozen filesystems.
+         *
+         * any other error means a failure to freeze a filesystem we
+         * expect to be freezable, so return an error in those cases
+         * and return system to thawed state.
+         */
+        ret = ioctl(fd, FIFREEZE);
+        if (ret == -1) {
+            if (errno != EOPNOTSUPP) {
+                error_setg_errno(errp, errno, "failed to freeze %s",
+                                 mount->dirname);
+                close(fd);
+                goto error;
+            }
+        } else {
+            i++;
+        }
+        close(fd);
+    }
+
+    free_fs_mount_list(&mounts);
+    return i;
+
+error:
+    free_fs_mount_list(&mounts);
+    qmp_guest_fsfreeze_thaw(NULL);
+    return 0;
+}
+
+/*
+ * Walk list of frozen file systems in the guest, and thaw them.
+ */
+int64_t qmp_guest_fsfreeze_thaw(Error **errp)
+{
+    int ret;
+    FsMountList mounts;
+    FsMount *mount;
+    int fd, i = 0, logged;
+    Error *local_err = NULL;
+
+    QTAILQ_INIT(&mounts);
+    build_fs_mount_list(&mounts, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return 0;
+    }
+
+    QTAILQ_FOREACH(mount, &mounts, next) {
+        logged = false;
+        fd = qemu_open(mount->dirname, O_RDONLY);
+        if (fd == -1) {
+            continue;
+        }
+        /* we have no way of knowing whether a filesystem was actually unfrozen
+         * as a result of a successful call to FITHAW, only that if an error
+         * was returned the filesystem was *not* unfrozen by that particular
+         * call.
+         *
+         * since multiple preceding FIFREEZEs require multiple calls to FITHAW
+         * to unfreeze, continuing issuing FITHAW until an error is returned,
+         * in which case either the filesystem is in an unfreezable state, or,
+         * more likely, it was thawed previously (and remains so afterward).
+         *
+         * also, since the most recent successful call is the one that did
+         * the actual unfreeze, we can use this to provide an accurate count
+         * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
+         * may * be useful for determining whether a filesystem was unfrozen
+         * during the freeze/thaw phase by a process other than qemu-ga.
+         */
+        do {
+            ret = ioctl(fd, FITHAW);
+            if (ret == 0 && !logged) {
+                i++;
+                logged = true;
+            }
+        } while (ret == 0);
+        close(fd);
+    }
+
+    ga_unset_frozen(ga_state);
+    free_fs_mount_list(&mounts);
+
+    execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
+
+    return i;
+}
+
+static void guest_fsfreeze_cleanup(void)
+{
+    Error *err = NULL;
+
+    if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
+        qmp_guest_fsfreeze_thaw(&err);
+        if (err) {
+            slog("failed to clean up frozen filesystems: %s",
+                 error_get_pretty(err));
+            error_free(err);
+        }
+    }
+}
+#endif /* CONFIG_FSFREEZE */
+
+#if defined(CONFIG_FSTRIM)
+/*
+ * Walk list of mounted file systems in the guest, and trim them.
+ */
+GuestFilesystemTrimResponse *
+qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
+{
+    GuestFilesystemTrimResponse *response;
+    GuestFilesystemTrimResultList *list;
+    GuestFilesystemTrimResult *result;
+    int ret = 0;
+    FsMountList mounts;
+    struct FsMount *mount;
+    int fd;
+    Error *local_err = NULL;
+    struct fstrim_range r;
+
+    slog("guest-fstrim called");
+
+    QTAILQ_INIT(&mounts);
+    build_fs_mount_list(&mounts, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return NULL;
+    }
+
+    response = g_malloc0(sizeof(*response));
+
+    QTAILQ_FOREACH(mount, &mounts, next) {
+        result = g_malloc0(sizeof(*result));
+        result->path = g_strdup(mount->dirname);
+
+        list = g_malloc0(sizeof(*list));
+        list->value = result;
+        list->next = response->paths;
+        response->paths = list;
+
+        fd = qemu_open(mount->dirname, O_RDONLY);
+        if (fd == -1) {
+            result->error = g_strdup_printf("failed to open: %s",
+                                            strerror(errno));
+            result->has_error = true;
+            continue;
+        }
+
+        /* We try to cull filesytems we know won't work in advance, but other
+         * filesytems may not implement fstrim for less obvious reasons.  These
+         * will report EOPNOTSUPP; while in some other cases ENOTTY will be
+         * reported (e.g. CD-ROMs).
+         * Any other error means an unexpected error.
+         */
+        r.start = 0;
+        r.len = -1;
+        r.minlen = has_minimum ? minimum : 0;
+        ret = ioctl(fd, FITRIM, &r);
+        if (ret == -1) {
+            result->has_error = true;
+            if (errno == ENOTTY || errno == EOPNOTSUPP) {
+                result->error = g_strdup("trim not supported");
+            } else {
+                result->error = g_strdup_printf("failed to trim: %s",
+                                                strerror(errno));
+            }
+            close(fd);
+            continue;
+        }
+
+        result->has_minimum = true;
+        result->minimum = r.minlen;
+        result->has_trimmed = true;
+        result->trimmed = r.len;
+        close(fd);
+    }
+
+    free_fs_mount_list(&mounts);
+    return response;
+}
+#endif /* CONFIG_FSTRIM */
+
+
+#define LINUX_SYS_STATE_FILE "/sys/power/state"
+#define SUSPEND_SUPPORTED 0
+#define SUSPEND_NOT_SUPPORTED 1
+
+static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
+                               const char *sysfile_str, Error **errp)
+{
+    Error *local_err = NULL;
+    char *pmutils_path;
+    pid_t pid;
+    int status;
+
+    pmutils_path = g_find_program_in_path(pmutils_bin);
+
+    pid = fork();
+    if (!pid) {
+        char buf[32]; /* hopefully big enough */
+        ssize_t ret;
+        int fd;
+
+        setsid();
+        reopen_fd_to_null(0);
+        reopen_fd_to_null(1);
+        reopen_fd_to_null(2);
+
+        if (pmutils_path) {
+            execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
+        }
+
+        /*
+         * If we get here either pm-utils is not installed or execle() has
+         * failed. Let's try the manual method if the caller wants it.
+         */
+
+        if (!sysfile_str) {
+            _exit(SUSPEND_NOT_SUPPORTED);
+        }
+
+        fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
+        if (fd < 0) {
+            _exit(SUSPEND_NOT_SUPPORTED);
+        }
+
+        ret = read(fd, buf, sizeof(buf)-1);
+        if (ret <= 0) {
+            _exit(SUSPEND_NOT_SUPPORTED);
+        }
+        buf[ret] = '\0';
+
+        if (strstr(buf, sysfile_str)) {
+            _exit(SUSPEND_SUPPORTED);
+        }
+
+        _exit(SUSPEND_NOT_SUPPORTED);
+    } else if (pid < 0) {
+        error_setg_errno(errp, errno, "failed to create child process");
+        goto out;
+    }
+
+    ga_wait_child(pid, &status, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        goto out;
+    }
+
+    if (!WIFEXITED(status)) {
+        error_setg(errp, "child process has terminated abnormally");
+        goto out;
+    }
+
+    switch (WEXITSTATUS(status)) {
+    case SUSPEND_SUPPORTED:
+        goto out;
+    case SUSPEND_NOT_SUPPORTED:
+        error_setg(errp,
+                   "the requested suspend mode is not supported by the guest");
+        goto out;
+    default:
+        error_setg(errp,
+                   "the helper program '%s' returned an unexpected exit status"
+                   " code (%d)", pmutils_path, WEXITSTATUS(status));
+        goto out;
+    }
+
+out:
+    g_free(pmutils_path);
+}
+
+static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
+                          Error **errp)
+{
+    Error *local_err = NULL;
+    char *pmutils_path;
+    pid_t pid;
+    int status;
+
+    pmutils_path = g_find_program_in_path(pmutils_bin);
+
+    pid = fork();
+    if (pid == 0) {
+        /* child */
+        int fd;
+
+        setsid();
+        reopen_fd_to_null(0);
+        reopen_fd_to_null(1);
+        reopen_fd_to_null(2);
+
+        if (pmutils_path) {
+            execle(pmutils_path, pmutils_bin, NULL, environ);
+        }
+
+        /*
+         * If we get here either pm-utils is not installed or execle() has
+         * failed. Let's try the manual method if the caller wants it.
+         */
+
+        if (!sysfile_str) {
+            _exit(EXIT_FAILURE);
+        }
+
+        fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
+        if (fd < 0) {
+            _exit(EXIT_FAILURE);
+        }
+
+        if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
+            _exit(EXIT_FAILURE);
+        }
+
+        _exit(EXIT_SUCCESS);
+    } else if (pid < 0) {
+        error_setg_errno(errp, errno, "failed to create child process");
+        goto out;
+    }
+
+    ga_wait_child(pid, &status, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        goto out;
+    }
+
+    if (!WIFEXITED(status)) {
+        error_setg(errp, "child process has terminated abnormally");
+        goto out;
+    }
+
+    if (WEXITSTATUS(status)) {
+        error_setg(errp, "child process has failed to suspend");
+        goto out;
+    }
+
+out:
+    g_free(pmutils_path);
+}
+
+void qmp_guest_suspend_disk(Error **errp)
+{
+    Error *local_err = NULL;
+
+    bios_supports_mode("pm-is-supported", "--hibernate", "disk", &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    guest_suspend("pm-hibernate", "disk", errp);
+}
+
+void qmp_guest_suspend_ram(Error **errp)
+{
+    Error *local_err = NULL;
+
+    bios_supports_mode("pm-is-supported", "--suspend", "mem", &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    guest_suspend("pm-suspend", "mem", errp);
+}
+
+void qmp_guest_suspend_hybrid(Error **errp)
+{
+    Error *local_err = NULL;
+
+    bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL,
+                       &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+
+    guest_suspend("pm-suspend-hybrid", NULL, errp);
+}
+
+static GuestNetworkInterfaceList *
+guest_find_interface(GuestNetworkInterfaceList *head,
+                     const char *name)
+{
+    for (; head; head = head->next) {
+        if (strcmp(head->value->name, name) == 0) {
+            break;
+        }
+    }
+
+    return head;
+}
+
+/*
+ * Build information about guest interfaces
+ */
+GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
+{
+    GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
+    struct ifaddrs *ifap, *ifa;
+
+    if (getifaddrs(&ifap) < 0) {
+        error_setg_errno(errp, errno, "getifaddrs failed");
+        goto error;
+    }
+
+    for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
+        GuestNetworkInterfaceList *info;
+        GuestIpAddressList **address_list = NULL, *address_item = NULL;
+        char addr4[INET_ADDRSTRLEN];
+        char addr6[INET6_ADDRSTRLEN];
+        int sock;
+        struct ifreq ifr;
+        unsigned char *mac_addr;
+        void *p;
+
+        g_debug("Processing %s interface", ifa->ifa_name);
+
+        info = guest_find_interface(head, ifa->ifa_name);
+
+        if (!info) {
+            info = g_malloc0(sizeof(*info));
+            info->value = g_malloc0(sizeof(*info->value));
+            info->value->name = g_strdup(ifa->ifa_name);
+
+            if (!cur_item) {
+                head = cur_item = info;
+            } else {
+                cur_item->next = info;
+                cur_item = info;
+            }
+        }
+
+        if (!info->value->has_hardware_address &&
+            ifa->ifa_flags & SIOCGIFHWADDR) {
+            /* we haven't obtained HW address yet */
+            sock = socket(PF_INET, SOCK_STREAM, 0);
+            if (sock == -1) {
+                error_setg_errno(errp, errno, "failed to create socket");
+                goto error;
+            }
+
+            memset(&ifr, 0, sizeof(ifr));
+            pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name);
+            if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
+                error_setg_errno(errp, errno,
+                                 "failed to get MAC address of %s",
+                                 ifa->ifa_name);
+                close(sock);
+                goto error;
+            }
+
+            close(sock);
+            mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
+
+            info->value->hardware_address =
+                g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
+                                (int) mac_addr[0], (int) mac_addr[1],
+                                (int) mac_addr[2], (int) mac_addr[3],
+                                (int) mac_addr[4], (int) mac_addr[5]);
+
+            info->value->has_hardware_address = true;
+        }
+
+        if (ifa->ifa_addr &&
+            ifa->ifa_addr->sa_family == AF_INET) {
+            /* interface with IPv4 address */
+            p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
+            if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
+                error_setg_errno(errp, errno, "inet_ntop failed");
+                goto error;
+            }
+
+            address_item = g_malloc0(sizeof(*address_item));
+            address_item->value = g_malloc0(sizeof(*address_item->value));
+            address_item->value->ip_address = g_strdup(addr4);
+            address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
+
+            if (ifa->ifa_netmask) {
+                /* Count the number of set bits in netmask.
+                 * This is safe as '1' and '0' cannot be shuffled in netmask. */
+                p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
+                address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
+            }
+        } else if (ifa->ifa_addr &&
+                   ifa->ifa_addr->sa_family == AF_INET6) {
+            /* interface with IPv6 address */
+            p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
+            if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
+                error_setg_errno(errp, errno, "inet_ntop failed");
+                goto error;
+            }
+
+            address_item = g_malloc0(sizeof(*address_item));
+            address_item->value = g_malloc0(sizeof(*address_item->value));
+            address_item->value->ip_address = g_strdup(addr6);
+            address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
+
+            if (ifa->ifa_netmask) {
+                /* Count the number of set bits in netmask.
+                 * This is safe as '1' and '0' cannot be shuffled in netmask. */
+                p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
+                address_item->value->prefix =
+                    ctpop32(((uint32_t *) p)[0]) +
+                    ctpop32(((uint32_t *) p)[1]) +
+                    ctpop32(((uint32_t *) p)[2]) +
+                    ctpop32(((uint32_t *) p)[3]);
+            }
+        }
+
+        if (!address_item) {
+            continue;
+        }
+
+        address_list = &info->value->ip_addresses;
+
+        while (*address_list && (*address_list)->next) {
+            address_list = &(*address_list)->next;
+        }
+
+        if (!*address_list) {
+            *address_list = address_item;
+        } else {
+            (*address_list)->next = address_item;
+        }
+
+        info->value->has_ip_addresses = true;
+
+
+    }
+
+    freeifaddrs(ifap);
+    return head;
+
+error:
+    freeifaddrs(ifap);
+    qapi_free_GuestNetworkInterfaceList(head);
+    return NULL;
+}
+
+#define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp))
+
+static long sysconf_exact(int name, const char *name_str, Error **errp)
+{
+    long ret;
+
+    errno = 0;
+    ret = sysconf(name);
+    if (ret == -1) {
+        if (errno == 0) {
+            error_setg(errp, "sysconf(%s): value indefinite", name_str);
+        } else {
+            error_setg_errno(errp, errno, "sysconf(%s)", name_str);
+        }
+    }
+    return ret;
+}
+
+/* Transfer online/offline status between @vcpu and the guest system.
+ *
+ * On input either @errp or *@errp must be NULL.
+ *
+ * In system-to-@vcpu direction, the following @vcpu fields are accessed:
+ * - R: vcpu->logical_id
+ * - W: vcpu->online
+ * - W: vcpu->can_offline
+ *
+ * In @vcpu-to-system direction, the following @vcpu fields are accessed:
+ * - R: vcpu->logical_id
+ * - R: vcpu->online
+ *
+ * Written members remain unmodified on error.
+ */
+static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
+                          Error **errp)
+{
+    char *dirpath;
+    int dirfd;
+
+    dirpath = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
+                              vcpu->logical_id);
+    dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
+    if (dirfd == -1) {
+        error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
+    } else {
+        static const char fn[] = "online";
+        int fd;
+        int res;
+
+        fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
+        if (fd == -1) {
+            if (errno != ENOENT) {
+                error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
+            } else if (sys2vcpu) {
+                vcpu->online = true;
+                vcpu->can_offline = false;
+            } else if (!vcpu->online) {
+                error_setg(errp, "logical processor #%" PRId64 " can't be "
+                           "offlined", vcpu->logical_id);
+            } /* otherwise pretend successful re-onlining */
+        } else {
+            unsigned char status;
+
+            res = pread(fd, &status, 1, 0);
+            if (res == -1) {
+                error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
+            } else if (res == 0) {
+                error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
+                           fn);
+            } else if (sys2vcpu) {
+                vcpu->online = (status != '0');
+                vcpu->can_offline = true;
+            } else if (vcpu->online != (status != '0')) {
+                status = '0' + vcpu->online;
+                if (pwrite(fd, &status, 1, 0) == -1) {
+                    error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
+                                     fn);
+                }
+            } /* otherwise pretend successful re-(on|off)-lining */
+
+            res = close(fd);
+            g_assert(res == 0);
+        }
+
+        res = close(dirfd);
+        g_assert(res == 0);
+    }
+
+    g_free(dirpath);
+}
+
+GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
+{
+    int64_t current;
+    GuestLogicalProcessorList *head, **link;
+    long sc_max;
+    Error *local_err = NULL;
+
+    current = 0;
+    head = NULL;
+    link = &head;
+    sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
+
+    while (local_err == NULL && current < sc_max) {
+        GuestLogicalProcessor *vcpu;
+        GuestLogicalProcessorList *entry;
+
+        vcpu = g_malloc0(sizeof *vcpu);
+        vcpu->logical_id = current++;
+        vcpu->has_can_offline = true; /* lolspeak ftw */
+        transfer_vcpu(vcpu, true, &local_err);
+
+        entry = g_malloc0(sizeof *entry);
+        entry->value = vcpu;
+
+        *link = entry;
+        link = &entry->next;
+    }
+
+    if (local_err == NULL) {
+        /* there's no guest with zero VCPUs */
+        g_assert(head != NULL);
+        return head;
+    }
+
+    qapi_free_GuestLogicalProcessorList(head);
+    error_propagate(errp, local_err);
+    return NULL;
+}
+
+int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
+{
+    int64_t processed;
+    Error *local_err = NULL;
+
+    processed = 0;
+    while (vcpus != NULL) {
+        transfer_vcpu(vcpus->value, false, &local_err);
+        if (local_err != NULL) {
+            break;
+        }
+        ++processed;
+        vcpus = vcpus->next;
+    }
+
+    if (local_err != NULL) {
+        if (processed == 0) {
+            error_propagate(errp, local_err);
+        } else {
+            error_free(local_err);
+        }
+    }
+
+    return processed;
+}
+
+void qmp_guest_set_user_password(const char *username,
+                                 const char *password,
+                                 bool crypted,
+                                 Error **errp)
+{
+    Error *local_err = NULL;
+    char *passwd_path = NULL;
+    pid_t pid;
+    int status;
+    int datafd[2] = { -1, -1 };
+    char *rawpasswddata = NULL;
+    size_t rawpasswdlen;
+    char *chpasswddata = NULL;
+    size_t chpasswdlen;
+
+    rawpasswddata = (char *)g_base64_decode(password, &rawpasswdlen);
+    rawpasswddata = g_renew(char, rawpasswddata, rawpasswdlen + 1);
+    rawpasswddata[rawpasswdlen] = '\0';
+
+    if (strchr(rawpasswddata, '\n')) {
+        error_setg(errp, "forbidden characters in raw password");
+        goto out;
+    }
+
+    if (strchr(username, '\n') ||
+        strchr(username, ':')) {
+        error_setg(errp, "forbidden characters in username");
+        goto out;
+    }
+
+    chpasswddata = g_strdup_printf("%s:%s\n", username, rawpasswddata);
+    chpasswdlen = strlen(chpasswddata);
+
+    passwd_path = g_find_program_in_path("chpasswd");
+
+    if (!passwd_path) {
+        error_setg(errp, "cannot find 'passwd' program in PATH");
+        goto out;
+    }
+
+    if (pipe(datafd) < 0) {
+        error_setg(errp, "cannot create pipe FDs");
+        goto out;
+    }
+
+    pid = fork();
+    if (pid == 0) {
+        close(datafd[1]);
+        /* child */
+        setsid();
+        dup2(datafd[0], 0);
+        reopen_fd_to_null(1);
+        reopen_fd_to_null(2);
+
+        if (crypted) {
+            execle(passwd_path, "chpasswd", "-e", NULL, environ);
+        } else {
+            execle(passwd_path, "chpasswd", NULL, environ);
+        }
+        _exit(EXIT_FAILURE);
+    } else if (pid < 0) {
+        error_setg_errno(errp, errno, "failed to create child process");
+        goto out;
+    }
+    close(datafd[0]);
+    datafd[0] = -1;
+
+    if (qemu_write_full(datafd[1], chpasswddata, chpasswdlen) != chpasswdlen) {
+        error_setg_errno(errp, errno, "cannot write new account password");
+        goto out;
+    }
+    close(datafd[1]);
+    datafd[1] = -1;
+
+    ga_wait_child(pid, &status, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        goto out;
+    }
+
+    if (!WIFEXITED(status)) {
+        error_setg(errp, "child process has terminated abnormally");
+        goto out;
+    }
+
+    if (WEXITSTATUS(status)) {
+        error_setg(errp, "child process has failed to set user password");
+        goto out;
+    }
+
+out:
+    g_free(chpasswddata);
+    g_free(rawpasswddata);
+    g_free(passwd_path);
+    if (datafd[0] != -1) {
+        close(datafd[0]);
+    }
+    if (datafd[1] != -1) {
+        close(datafd[1]);
+    }
+}
+
+static void ga_read_sysfs_file(int dirfd, const char *pathname, char *buf,
+                               int size, Error **errp)
+{
+    int fd;
+    int res;
+
+    errno = 0;
+    fd = openat(dirfd, pathname, O_RDONLY);
+    if (fd == -1) {
+        error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
+        return;
+    }
+
+    res = pread(fd, buf, size, 0);
+    if (res == -1) {
+        error_setg_errno(errp, errno, "pread sysfs file \"%s\"", pathname);
+    } else if (res == 0) {
+        error_setg(errp, "pread sysfs file \"%s\": unexpected EOF", pathname);
+    }
+    close(fd);
+}
+
+static void ga_write_sysfs_file(int dirfd, const char *pathname,
+                                const char *buf, int size, Error **errp)
+{
+    int fd;
+
+    errno = 0;
+    fd = openat(dirfd, pathname, O_WRONLY);
+    if (fd == -1) {
+        error_setg_errno(errp, errno, "open sysfs file \"%s\"", pathname);
+        return;
+    }
+
+    if (pwrite(fd, buf, size, 0) == -1) {
+        error_setg_errno(errp, errno, "pwrite sysfs file \"%s\"", pathname);
+    }
+
+    close(fd);
+}
+
+/* Transfer online/offline status between @mem_blk and the guest system.
+ *
+ * On input either @errp or *@errp must be NULL.
+ *
+ * In system-to-@mem_blk direction, the following @mem_blk fields are accessed:
+ * - R: mem_blk->phys_index
+ * - W: mem_blk->online
+ * - W: mem_blk->can_offline
+ *
+ * In @mem_blk-to-system direction, the following @mem_blk fields are accessed:
+ * - R: mem_blk->phys_index
+ * - R: mem_blk->online
+ *-  R: mem_blk->can_offline
+ * Written members remain unmodified on error.
+ */
+static void transfer_memory_block(GuestMemoryBlock *mem_blk, bool sys2memblk,
+                                  GuestMemoryBlockResponse *result,
+                                  Error **errp)
+{
+    char *dirpath;
+    int dirfd;
+    char *status;
+    Error *local_err = NULL;
+
+    if (!sys2memblk) {
+        DIR *dp;
+
+        if (!result) {
+            error_setg(errp, "Internal error, 'result' should not be NULL");
+            return;
+        }
+        errno = 0;
+        dp = opendir("/sys/devices/system/memory/");
+         /* if there is no 'memory' directory in sysfs,
+         * we think this VM does not support online/offline memory block,
+         * any other solution?
+         */
+        if (!dp && errno == ENOENT) {
+            result->response =
+                GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
+            goto out1;
+        }
+        closedir(dp);
+    }
+
+    dirpath = g_strdup_printf("/sys/devices/system/memory/memory%" PRId64 "/",
+                              mem_blk->phys_index);
+    dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
+    if (dirfd == -1) {
+        if (sys2memblk) {
+            error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
+        } else {
+            if (errno == ENOENT) {
+                result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_NOT_FOUND;
+            } else {
+                result->response =
+                    GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
+            }
+        }
+        g_free(dirpath);
+        goto out1;
+    }
+    g_free(dirpath);
+
+    status = g_malloc0(10);
+    ga_read_sysfs_file(dirfd, "state", status, 10, &local_err);
+    if (local_err) {
+        /* treat with sysfs file that not exist in old kernel */
+        if (errno == ENOENT) {
+            error_free(local_err);
+            if (sys2memblk) {
+                mem_blk->online = true;
+                mem_blk->can_offline = false;
+            } else if (!mem_blk->online) {
+                result->response =
+                    GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_NOT_SUPPORTED;
+            }
+        } else {
+            if (sys2memblk) {
+                error_propagate(errp, local_err);
+            } else {
+                result->response =
+                    GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
+            }
+        }
+        goto out2;
+    }
+
+    if (sys2memblk) {
+        char removable = '0';
+
+        mem_blk->online = (strncmp(status, "online", 6) == 0);
+
+        ga_read_sysfs_file(dirfd, "removable", &removable, 1, &local_err);
+        if (local_err) {
+            /* if no 'removable' file, it does't support offline mem blk */
+            if (errno == ENOENT) {
+                error_free(local_err);
+                mem_blk->can_offline = false;
+            } else {
+                error_propagate(errp, local_err);
+            }
+        } else {
+            mem_blk->can_offline = (removable != '0');
+        }
+    } else {
+        if (mem_blk->online != (strncmp(status, "online", 6) == 0)) {
+            char *new_state = mem_blk->online ? g_strdup("online") :
+                                                g_strdup("offline");
+
+            ga_write_sysfs_file(dirfd, "state", new_state, strlen(new_state),
+                                &local_err);
+            g_free(new_state);
+            if (local_err) {
+                error_free(local_err);
+                result->response =
+                    GUEST_MEMORY_BLOCK_RESPONSE_TYPE_OPERATION_FAILED;
+                goto out2;
+            }
+
+            result->response = GUEST_MEMORY_BLOCK_RESPONSE_TYPE_SUCCESS;
+            result->has_error_code = false;
+        } /* otherwise pretend successful re-(on|off)-lining */
+    }
+    g_free(status);
+    close(dirfd);
+    return;
+
+out2:
+    g_free(status);
+    close(dirfd);
+out1:
+    if (!sys2memblk) {
+        result->has_error_code = true;
+        result->error_code = errno;
+    }
+}
+
+GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
+{
+    GuestMemoryBlockList *head, **link;
+    Error *local_err = NULL;
+    struct dirent *de;
+    DIR *dp;
+
+    head = NULL;
+    link = &head;
+
+    dp = opendir("/sys/devices/system/memory/");
+    if (!dp) {
+        error_setg_errno(errp, errno, "Can't open directory"
+                         "\"/sys/devices/system/memory/\"\n");
+        return NULL;
+    }
+
+    /* Note: the phys_index of memory block may be discontinuous,
+     * this is because a memblk is the unit of the Sparse Memory design, which
+     * allows discontinuous memory ranges (ex. NUMA), so here we should
+     * traverse the memory block directory.
+     */
+    while ((de = readdir(dp)) != NULL) {
+        GuestMemoryBlock *mem_blk;
+        GuestMemoryBlockList *entry;
+
+        if ((strncmp(de->d_name, "memory", 6) != 0) ||
+            !(de->d_type & DT_DIR)) {
+            continue;
+        }
+
+        mem_blk = g_malloc0(sizeof *mem_blk);
+        /* The d_name is "memoryXXX",  phys_index is block id, same as XXX */
+        mem_blk->phys_index = strtoul(&de->d_name[6], NULL, 10);
+        mem_blk->has_can_offline = true; /* lolspeak ftw */
+        transfer_memory_block(mem_blk, true, NULL, &local_err);
+
+        entry = g_malloc0(sizeof *entry);
+        entry->value = mem_blk;
+
+        *link = entry;
+        link = &entry->next;
+    }
+
+    closedir(dp);
+    if (local_err == NULL) {
+        /* there's no guest with zero memory blocks */
+        if (head == NULL) {
+            error_setg(errp, "guest reported zero memory blocks!");
+        }
+        return head;
+    }
+
+    qapi_free_GuestMemoryBlockList(head);
+    error_propagate(errp, local_err);
+    return NULL;
+}
+
+GuestMemoryBlockResponseList *
+qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
+{
+    GuestMemoryBlockResponseList *head, **link;
+    Error *local_err = NULL;
+
+    head = NULL;
+    link = &head;
+
+    while (mem_blks != NULL) {
+        GuestMemoryBlockResponse *result;
+        GuestMemoryBlockResponseList *entry;
+        GuestMemoryBlock *current_mem_blk = mem_blks->value;
+
+        result = g_malloc0(sizeof(*result));
+        result->phys_index = current_mem_blk->phys_index;
+        transfer_memory_block(current_mem_blk, false, result, &local_err);
+        if (local_err) { /* should never happen */
+            goto err;
+        }
+        entry = g_malloc0(sizeof *entry);
+        entry->value = result;
+
+        *link = entry;
+        link = &entry->next;
+        mem_blks = mem_blks->next;
+    }
+
+    return head;
+err:
+    qapi_free_GuestMemoryBlockResponseList(head);
+    error_propagate(errp, local_err);
+    return NULL;
+}
+
+GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
+{
+    Error *local_err = NULL;
+    char *dirpath;
+    int dirfd;
+    char *buf;
+    GuestMemoryBlockInfo *info;
+
+    dirpath = g_strdup_printf("/sys/devices/system/memory/");
+    dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
+    if (dirfd == -1) {
+        error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
+        g_free(dirpath);
+        return NULL;
+    }
+    g_free(dirpath);
+
+    buf = g_malloc0(20);
+    ga_read_sysfs_file(dirfd, "block_size_bytes", buf, 20, &local_err);
+    close(dirfd);
+    if (local_err) {
+        g_free(buf);
+        error_propagate(errp, local_err);
+        return NULL;
+    }
+
+    info = g_new0(GuestMemoryBlockInfo, 1);
+    info->size = strtol(buf, NULL, 16); /* the unit is bytes */
+
+    g_free(buf);
+
+    return info;
+}
+
+#else /* defined(__linux__) */
+
+void qmp_guest_suspend_disk(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+}
+
+void qmp_guest_suspend_ram(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+}
+
+void qmp_guest_suspend_hybrid(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+}
+
+GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return -1;
+}
+
+void qmp_guest_set_user_password(const char *username,
+                                 const char *password,
+                                 bool crypted,
+                                 Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+}
+
+GuestMemoryBlockList *qmp_guest_get_memory_blocks(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+GuestMemoryBlockResponseList *
+qmp_guest_set_memory_blocks(GuestMemoryBlockList *mem_blks, Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+#endif
+
+#if !defined(CONFIG_FSFREEZE)
+
+GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+
+GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+
+    return 0;
+}
+
+int64_t qmp_guest_fsfreeze_freeze(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+
+    return 0;
+}
+
+int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
+                                       strList *mountpoints,
+                                       Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+
+    return 0;
+}
+
+int64_t qmp_guest_fsfreeze_thaw(Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+
+    return 0;
+}
+#endif /* CONFIG_FSFREEZE */
+
+#if !defined(CONFIG_FSTRIM)
+GuestFilesystemTrimResponse *
+qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
+{
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+}
+#endif
+
+/* add unsupported commands to the blacklist */
+GList *ga_command_blacklist_init(GList *blacklist)
+{
+#if !defined(__linux__)
+    {
+        const char *list[] = {
+            "guest-suspend-disk", "guest-suspend-ram",
+            "guest-suspend-hybrid", "guest-network-get-interfaces",
+            "guest-get-vcpus", "guest-set-vcpus",
+            "guest-get-memory-blocks", "guest-set-memory-blocks",
+            "guest-get-memory-block-size", NULL};
+        char **p = (char **)list;
+
+        while (*p) {
+            blacklist = g_list_append(blacklist, *p++);
+        }
+    }
+#endif
+
+#if !defined(CONFIG_FSFREEZE)
+    {
+        const char *list[] = {
+            "guest-get-fsinfo", "guest-fsfreeze-status",
+            "guest-fsfreeze-freeze", "guest-fsfreeze-freeze-list",
+            "guest-fsfreeze-thaw", "guest-get-fsinfo", NULL};
+        char **p = (char **)list;
+
+        while (*p) {
+            blacklist = g_list_append(blacklist, *p++);
+        }
+    }
+#endif
+
+#if !defined(CONFIG_FSTRIM)
+    blacklist = g_list_append(blacklist, (char *)"guest-fstrim");
+#endif
+
+    return blacklist;
+}
+
+/* register init/cleanup routines for stateful command groups */
+void ga_command_state_init(GAState *s, GACommandState *cs)
+{
+#if defined(CONFIG_FSFREEZE)
+    ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
+#endif
+    ga_command_state_add(cs, guest_file_init, NULL);
+}