mirror of https://gitee.com/openkylin/qemu.git
1478 lines
39 KiB
C
1478 lines
39 KiB
C
/*
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* QEMU Guest Agent POSIX-specific command implementations
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*
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* Copyright IBM Corp. 2011
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*
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* Authors:
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* Michael Roth <mdroth@linux.vnet.ibm.com>
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* Michal Privoznik <mprivozn@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include <glib.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <inttypes.h>
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#include "qga/guest-agent-core.h"
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#include "qga-qmp-commands.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/queue.h"
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#include "qemu/host-utils.h"
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#ifndef CONFIG_HAS_ENVIRON
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#ifdef __APPLE__
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#include <crt_externs.h>
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#define environ (*_NSGetEnviron())
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#else
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extern char **environ;
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#endif
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#endif
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#if defined(__linux__)
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#include <mntent.h>
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#include <linux/fs.h>
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#include <ifaddrs.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#ifdef FIFREEZE
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#define CONFIG_FSFREEZE
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#endif
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#ifdef FITRIM
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#define CONFIG_FSTRIM
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#endif
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#endif
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static void ga_wait_child(pid_t pid, int *status, Error **err)
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{
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pid_t rpid;
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*status = 0;
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do {
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rpid = waitpid(pid, status, 0);
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} while (rpid == -1 && errno == EINTR);
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if (rpid == -1) {
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error_setg_errno(err, errno, "failed to wait for child (pid: %d)", pid);
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return;
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}
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g_assert(rpid == pid);
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}
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void qmp_guest_shutdown(bool has_mode, const char *mode, Error **err)
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{
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const char *shutdown_flag;
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Error *local_err = NULL;
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pid_t pid;
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int status;
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slog("guest-shutdown called, mode: %s", mode);
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if (!has_mode || strcmp(mode, "powerdown") == 0) {
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shutdown_flag = "-P";
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} else if (strcmp(mode, "halt") == 0) {
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shutdown_flag = "-H";
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} else if (strcmp(mode, "reboot") == 0) {
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shutdown_flag = "-r";
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} else {
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error_setg(err,
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"mode is invalid (valid values are: halt|powerdown|reboot");
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return;
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}
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pid = fork();
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if (pid == 0) {
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/* child, start the shutdown */
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setsid();
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reopen_fd_to_null(0);
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reopen_fd_to_null(1);
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reopen_fd_to_null(2);
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execle("/sbin/shutdown", "shutdown", shutdown_flag, "+0",
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"hypervisor initiated shutdown", (char*)NULL, environ);
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_exit(EXIT_FAILURE);
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} else if (pid < 0) {
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error_setg_errno(err, errno, "failed to create child process");
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return;
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}
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ga_wait_child(pid, &status, &local_err);
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if (error_is_set(&local_err)) {
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error_propagate(err, local_err);
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return;
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}
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if (!WIFEXITED(status)) {
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error_setg(err, "child process has terminated abnormally");
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return;
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}
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if (WEXITSTATUS(status)) {
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error_setg(err, "child process has failed to shutdown");
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return;
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}
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/* succeeded */
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}
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int64_t qmp_guest_get_time(Error **errp)
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{
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int ret;
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qemu_timeval tq;
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int64_t time_ns;
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ret = qemu_gettimeofday(&tq);
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if (ret < 0) {
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error_setg_errno(errp, errno, "Failed to get time");
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return -1;
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}
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time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
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return time_ns;
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}
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void qmp_guest_set_time(int64_t time_ns, Error **errp)
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{
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int ret;
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int status;
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pid_t pid;
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Error *local_err = NULL;
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struct timeval tv;
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/* year-2038 will overflow in case time_t is 32bit */
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if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
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error_setg(errp, "Time %" PRId64 " is too large", time_ns);
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return;
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}
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tv.tv_sec = time_ns / 1000000000;
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tv.tv_usec = (time_ns % 1000000000) / 1000;
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ret = settimeofday(&tv, NULL);
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if (ret < 0) {
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error_setg_errno(errp, errno, "Failed to set time to guest");
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return;
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}
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/* Set the Hardware Clock to the current System Time. */
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pid = fork();
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if (pid == 0) {
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setsid();
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reopen_fd_to_null(0);
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reopen_fd_to_null(1);
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reopen_fd_to_null(2);
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execle("/sbin/hwclock", "hwclock", "-w", NULL, environ);
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_exit(EXIT_FAILURE);
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} else if (pid < 0) {
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error_setg_errno(errp, errno, "failed to create child process");
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return;
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}
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ga_wait_child(pid, &status, &local_err);
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if (error_is_set(&local_err)) {
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error_propagate(errp, local_err);
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return;
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}
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if (!WIFEXITED(status)) {
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error_setg(errp, "child process has terminated abnormally");
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return;
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}
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if (WEXITSTATUS(status)) {
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error_setg(errp, "hwclock failed to set hardware clock to system time");
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return;
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}
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}
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typedef struct GuestFileHandle {
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uint64_t id;
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FILE *fh;
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QTAILQ_ENTRY(GuestFileHandle) next;
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} GuestFileHandle;
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static struct {
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QTAILQ_HEAD(, GuestFileHandle) filehandles;
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} guest_file_state;
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static int64_t guest_file_handle_add(FILE *fh, Error **errp)
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{
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GuestFileHandle *gfh;
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int64_t handle;
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handle = ga_get_fd_handle(ga_state, errp);
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if (error_is_set(errp)) {
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return 0;
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}
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gfh = g_malloc0(sizeof(GuestFileHandle));
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gfh->id = handle;
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gfh->fh = fh;
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QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
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return handle;
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}
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static GuestFileHandle *guest_file_handle_find(int64_t id, Error **err)
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{
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GuestFileHandle *gfh;
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QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
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{
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if (gfh->id == id) {
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return gfh;
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}
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}
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error_setg(err, "handle '%" PRId64 "' has not been found", id);
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return NULL;
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}
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typedef const char * const ccpc;
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */
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static const struct {
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ccpc *forms;
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int oflag_base;
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} guest_file_open_modes[] = {
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{ (ccpc[]){ "r", NULL }, O_RDONLY },
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{ (ccpc[]){ "rb", NULL }, O_RDONLY | O_BINARY },
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{ (ccpc[]){ "w", NULL }, O_WRONLY | O_CREAT | O_TRUNC },
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{ (ccpc[]){ "wb", NULL }, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY },
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{ (ccpc[]){ "a", NULL }, O_WRONLY | O_CREAT | O_APPEND },
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{ (ccpc[]){ "ab", NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY },
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{ (ccpc[]){ "r+", NULL }, O_RDWR },
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{ (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR | O_BINARY },
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{ (ccpc[]){ "w+", NULL }, O_RDWR | O_CREAT | O_TRUNC },
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{ (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR | O_CREAT | O_TRUNC | O_BINARY },
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{ (ccpc[]){ "a+", NULL }, O_RDWR | O_CREAT | O_APPEND },
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{ (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR | O_CREAT | O_APPEND | O_BINARY }
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};
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static int
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find_open_flag(const char *mode_str, Error **err)
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{
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unsigned mode;
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for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
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ccpc *form;
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form = guest_file_open_modes[mode].forms;
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while (*form != NULL && strcmp(*form, mode_str) != 0) {
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++form;
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}
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if (*form != NULL) {
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break;
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}
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}
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if (mode == ARRAY_SIZE(guest_file_open_modes)) {
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error_setg(err, "invalid file open mode '%s'", mode_str);
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return -1;
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}
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return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK;
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}
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#define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \
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S_IRGRP | S_IWGRP | \
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S_IROTH | S_IWOTH)
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static FILE *
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safe_open_or_create(const char *path, const char *mode, Error **err)
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{
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Error *local_err = NULL;
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int oflag;
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oflag = find_open_flag(mode, &local_err);
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if (local_err == NULL) {
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int fd;
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/* If the caller wants / allows creation of a new file, we implement it
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* with a two step process: open() + (open() / fchmod()).
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*
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* First we insist on creating the file exclusively as a new file. If
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* that succeeds, we're free to set any file-mode bits on it. (The
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* motivation is that we want to set those file-mode bits independently
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* of the current umask.)
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*
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* If the exclusive creation fails because the file already exists
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* (EEXIST is not possible for any other reason), we just attempt to
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* open the file, but in this case we won't be allowed to change the
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* file-mode bits on the preexistent file.
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*
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* The pathname should never disappear between the two open()s in
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* practice. If it happens, then someone very likely tried to race us.
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* In this case just go ahead and report the ENOENT from the second
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* open() to the caller.
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*
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* If the caller wants to open a preexistent file, then the first
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* open() is decisive and its third argument is ignored, and the second
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* open() and the fchmod() are never called.
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*/
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fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
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if (fd == -1 && errno == EEXIST) {
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oflag &= ~(unsigned)O_CREAT;
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fd = open(path, oflag);
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}
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if (fd == -1) {
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error_setg_errno(&local_err, errno, "failed to open file '%s' "
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"(mode: '%s')", path, mode);
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} else {
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qemu_set_cloexec(fd);
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if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
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error_setg_errno(&local_err, errno, "failed to set permission "
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"0%03o on new file '%s' (mode: '%s')",
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(unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
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} else {
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FILE *f;
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f = fdopen(fd, mode);
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if (f == NULL) {
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error_setg_errno(&local_err, errno, "failed to associate "
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"stdio stream with file descriptor %d, "
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"file '%s' (mode: '%s')", fd, path, mode);
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} else {
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return f;
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}
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}
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close(fd);
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if (oflag & O_CREAT) {
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unlink(path);
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}
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}
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}
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error_propagate(err, local_err);
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return NULL;
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}
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int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode, Error **err)
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{
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FILE *fh;
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Error *local_err = NULL;
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int fd;
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int64_t ret = -1, handle;
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if (!has_mode) {
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mode = "r";
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}
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slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
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fh = safe_open_or_create(path, mode, &local_err);
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if (local_err != NULL) {
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error_propagate(err, local_err);
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return -1;
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}
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/* set fd non-blocking to avoid common use cases (like reading from a
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* named pipe) from hanging the agent
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*/
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fd = fileno(fh);
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ret = fcntl(fd, F_GETFL);
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ret = fcntl(fd, F_SETFL, ret | O_NONBLOCK);
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if (ret == -1) {
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error_setg_errno(err, errno, "failed to make file '%s' non-blocking",
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path);
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fclose(fh);
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return -1;
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}
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handle = guest_file_handle_add(fh, err);
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if (error_is_set(err)) {
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fclose(fh);
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return -1;
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}
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slog("guest-file-open, handle: %d", handle);
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return handle;
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}
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void qmp_guest_file_close(int64_t handle, Error **err)
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{
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GuestFileHandle *gfh = guest_file_handle_find(handle, err);
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int ret;
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slog("guest-file-close called, handle: %ld", handle);
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if (!gfh) {
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return;
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}
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ret = fclose(gfh->fh);
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if (ret == EOF) {
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error_setg_errno(err, errno, "failed to close handle");
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return;
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}
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QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
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g_free(gfh);
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}
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struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
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int64_t count, Error **err)
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{
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GuestFileHandle *gfh = guest_file_handle_find(handle, err);
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GuestFileRead *read_data = NULL;
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guchar *buf;
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FILE *fh;
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size_t read_count;
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if (!gfh) {
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return NULL;
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}
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if (!has_count) {
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count = QGA_READ_COUNT_DEFAULT;
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} else if (count < 0) {
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error_setg(err, "value '%" PRId64 "' is invalid for argument count",
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count);
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return NULL;
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}
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fh = gfh->fh;
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buf = g_malloc0(count+1);
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read_count = fread(buf, 1, count, fh);
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if (ferror(fh)) {
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error_setg_errno(err, errno, "failed to read file");
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slog("guest-file-read failed, handle: %ld", handle);
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} else {
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buf[read_count] = 0;
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read_data = g_malloc0(sizeof(GuestFileRead));
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read_data->count = read_count;
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read_data->eof = feof(fh);
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if (read_count) {
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read_data->buf_b64 = g_base64_encode(buf, read_count);
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}
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}
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g_free(buf);
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clearerr(fh);
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return read_data;
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}
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GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
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bool has_count, int64_t count, Error **err)
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{
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GuestFileWrite *write_data = NULL;
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guchar *buf;
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gsize buf_len;
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int write_count;
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GuestFileHandle *gfh = guest_file_handle_find(handle, err);
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FILE *fh;
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if (!gfh) {
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return NULL;
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}
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fh = gfh->fh;
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buf = g_base64_decode(buf_b64, &buf_len);
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if (!has_count) {
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count = buf_len;
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} else if (count < 0 || count > buf_len) {
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error_setg(err, "value '%" PRId64 "' is invalid for argument count",
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count);
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g_free(buf);
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return NULL;
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}
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write_count = fwrite(buf, 1, count, fh);
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if (ferror(fh)) {
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error_setg_errno(err, errno, "failed to write to file");
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slog("guest-file-write failed, handle: %ld", handle);
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} else {
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write_data = g_malloc0(sizeof(GuestFileWrite));
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write_data->count = write_count;
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write_data->eof = feof(fh);
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}
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g_free(buf);
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clearerr(fh);
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return write_data;
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}
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struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
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int64_t whence, Error **err)
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{
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GuestFileHandle *gfh = guest_file_handle_find(handle, err);
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GuestFileSeek *seek_data = NULL;
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FILE *fh;
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int ret;
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if (!gfh) {
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return NULL;
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}
|
|
|
|
fh = gfh->fh;
|
|
ret = fseek(fh, offset, whence);
|
|
if (ret == -1) {
|
|
error_setg_errno(err, errno, "failed to seek file");
|
|
} else {
|
|
seek_data = g_malloc0(sizeof(GuestFileRead));
|
|
seek_data->position = ftell(fh);
|
|
seek_data->eof = feof(fh);
|
|
}
|
|
clearerr(fh);
|
|
|
|
return seek_data;
|
|
}
|
|
|
|
void qmp_guest_file_flush(int64_t handle, Error **err)
|
|
{
|
|
GuestFileHandle *gfh = guest_file_handle_find(handle, err);
|
|
FILE *fh;
|
|
int ret;
|
|
|
|
if (!gfh) {
|
|
return;
|
|
}
|
|
|
|
fh = gfh->fh;
|
|
ret = fflush(fh);
|
|
if (ret == EOF) {
|
|
error_setg_errno(err, 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;
|
|
QTAILQ_ENTRY(FsMount) next;
|
|
} FsMount;
|
|
|
|
typedef QTAILQ_HEAD(, 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);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Walk the mount table and build a list of local file systems
|
|
*/
|
|
static void build_fs_mount_list(FsMountList *mounts, Error **err)
|
|
{
|
|
struct mntent *ment;
|
|
FsMount *mount;
|
|
char const *mtab = "/proc/self/mounts";
|
|
FILE *fp;
|
|
|
|
fp = setmntent(mtab, "r");
|
|
if (!fp) {
|
|
error_setg(err, "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;
|
|
}
|
|
|
|
mount = g_malloc0(sizeof(FsMount));
|
|
mount->dirname = g_strdup(ment->mnt_dir);
|
|
mount->devtype = g_strdup(ment->mnt_type);
|
|
|
|
QTAILQ_INSERT_TAIL(mounts, mount, next);
|
|
}
|
|
|
|
endmntent(fp);
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_FSFREEZE)
|
|
|
|
typedef enum {
|
|
FSFREEZE_HOOK_THAW = 0,
|
|
FSFREEZE_HOOK_FREEZE,
|
|
} FsfreezeHookArg;
|
|
|
|
const char *fsfreeze_hook_arg_string[] = {
|
|
"thaw",
|
|
"freeze",
|
|
};
|
|
|
|
static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **err)
|
|
{
|
|
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(err, 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(err, errno, "failed to create child process");
|
|
return;
|
|
}
|
|
|
|
ga_wait_child(pid, &status, &local_err);
|
|
if (error_is_set(&local_err)) {
|
|
error_propagate(err, local_err);
|
|
return;
|
|
}
|
|
|
|
if (!WIFEXITED(status)) {
|
|
error_setg(err, "fsfreeze hook has terminated abnormally");
|
|
return;
|
|
}
|
|
|
|
status = WEXITSTATUS(status);
|
|
if (status) {
|
|
error_setg(err, "fsfreeze hook has failed with status %d", status);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return status of freeze/thaw
|
|
*/
|
|
GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
|
|
{
|
|
if (ga_is_frozen(ga_state)) {
|
|
return GUEST_FSFREEZE_STATUS_FROZEN;
|
|
}
|
|
|
|
return GUEST_FSFREEZE_STATUS_THAWED;
|
|
}
|
|
|
|
/*
|
|
* 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(Error **err)
|
|
{
|
|
int ret = 0, i = 0;
|
|
FsMountList mounts;
|
|
struct FsMount *mount;
|
|
Error *local_err = NULL;
|
|
int fd;
|
|
|
|
slog("guest-fsfreeze called");
|
|
|
|
execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
|
|
if (error_is_set(&local_err)) {
|
|
error_propagate(err, local_err);
|
|
return -1;
|
|
}
|
|
|
|
QTAILQ_INIT(&mounts);
|
|
build_fs_mount_list(&mounts, &local_err);
|
|
if (error_is_set(&local_err)) {
|
|
error_propagate(err, local_err);
|
|
return -1;
|
|
}
|
|
|
|
/* cannot risk guest agent blocking itself on a write in this state */
|
|
ga_set_frozen(ga_state);
|
|
|
|
QTAILQ_FOREACH(mount, &mounts, next) {
|
|
fd = qemu_open(mount->dirname, O_RDONLY);
|
|
if (fd == -1) {
|
|
error_setg_errno(err, 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(err, 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 **err)
|
|
{
|
|
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 (error_is_set(&local_err)) {
|
|
error_propagate(err, 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, err);
|
|
|
|
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.
|
|
*/
|
|
void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **err)
|
|
{
|
|
int ret = 0;
|
|
FsMountList mounts;
|
|
struct FsMount *mount;
|
|
int fd;
|
|
Error *local_err = NULL;
|
|
struct fstrim_range r = {
|
|
.start = 0,
|
|
.len = -1,
|
|
.minlen = has_minimum ? minimum : 0,
|
|
};
|
|
|
|
slog("guest-fstrim called");
|
|
|
|
QTAILQ_INIT(&mounts);
|
|
build_fs_mount_list(&mounts, &local_err);
|
|
if (error_is_set(&local_err)) {
|
|
error_propagate(err, local_err);
|
|
return;
|
|
}
|
|
|
|
QTAILQ_FOREACH(mount, &mounts, next) {
|
|
fd = qemu_open(mount->dirname, O_RDONLY);
|
|
if (fd == -1) {
|
|
error_setg_errno(err, 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 fstrim for less obvious reasons. These
|
|
* will report EOPNOTSUPP; we simply ignore these errors. Any other
|
|
* error means an unexpected error, so return it in those cases. In
|
|
* some other cases ENOTTY will be reported (e.g. CD-ROMs).
|
|
*/
|
|
ret = ioctl(fd, FITRIM, &r);
|
|
if (ret == -1) {
|
|
if (errno != ENOTTY && errno != EOPNOTSUPP) {
|
|
error_setg_errno(err, errno, "failed to trim %s",
|
|
mount->dirname);
|
|
close(fd);
|
|
goto error;
|
|
}
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
error:
|
|
free_fs_mount_list(&mounts);
|
|
}
|
|
#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 **err)
|
|
{
|
|
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(err, errno, "failed to create child process");
|
|
goto out;
|
|
}
|
|
|
|
ga_wait_child(pid, &status, &local_err);
|
|
if (error_is_set(&local_err)) {
|
|
error_propagate(err, local_err);
|
|
goto out;
|
|
}
|
|
|
|
if (!WIFEXITED(status)) {
|
|
error_setg(err, "child process has terminated abnormally");
|
|
goto out;
|
|
}
|
|
|
|
switch (WEXITSTATUS(status)) {
|
|
case SUSPEND_SUPPORTED:
|
|
goto out;
|
|
case SUSPEND_NOT_SUPPORTED:
|
|
error_setg(err,
|
|
"the requested suspend mode is not supported by the guest");
|
|
goto out;
|
|
default:
|
|
error_setg(err,
|
|
"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 **err)
|
|
{
|
|
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(err, errno, "failed to create child process");
|
|
goto out;
|
|
}
|
|
|
|
ga_wait_child(pid, &status, &local_err);
|
|
if (error_is_set(&local_err)) {
|
|
error_propagate(err, local_err);
|
|
goto out;
|
|
}
|
|
|
|
if (!WIFEXITED(status)) {
|
|
error_setg(err, "child process has terminated abnormally");
|
|
goto out;
|
|
}
|
|
|
|
if (WEXITSTATUS(status)) {
|
|
error_setg(err, "child process has failed to suspend");
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
g_free(pmutils_path);
|
|
}
|
|
|
|
void qmp_guest_suspend_disk(Error **err)
|
|
{
|
|
bios_supports_mode("pm-is-supported", "--hibernate", "disk", err);
|
|
if (error_is_set(err)) {
|
|
return;
|
|
}
|
|
|
|
guest_suspend("pm-hibernate", "disk", err);
|
|
}
|
|
|
|
void qmp_guest_suspend_ram(Error **err)
|
|
{
|
|
bios_supports_mode("pm-is-supported", "--suspend", "mem", err);
|
|
if (error_is_set(err)) {
|
|
return;
|
|
}
|
|
|
|
guest_suspend("pm-suspend", "mem", err);
|
|
}
|
|
|
|
void qmp_guest_suspend_hybrid(Error **err)
|
|
{
|
|
bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL, err);
|
|
if (error_is_set(err)) {
|
|
return;
|
|
}
|
|
|
|
guest_suspend("pm-suspend-hybrid", NULL, err);
|
|
}
|
|
|
|
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, err) sysconf_exact((name), #name, (err))
|
|
|
|
static long sysconf_exact(int name, const char *name_str, Error **err)
|
|
{
|
|
long ret;
|
|
|
|
errno = 0;
|
|
ret = sysconf(name);
|
|
if (ret == -1) {
|
|
if (errno == 0) {
|
|
error_setg(err, "sysconf(%s): value indefinite", name_str);
|
|
} else {
|
|
error_setg_errno(err, 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;
|
|
}
|
|
|
|
#else /* defined(__linux__) */
|
|
|
|
void qmp_guest_suspend_disk(Error **err)
|
|
{
|
|
error_set(err, QERR_UNSUPPORTED);
|
|
}
|
|
|
|
void qmp_guest_suspend_ram(Error **err)
|
|
{
|
|
error_set(err, QERR_UNSUPPORTED);
|
|
}
|
|
|
|
void qmp_guest_suspend_hybrid(Error **err)
|
|
{
|
|
error_set(err, QERR_UNSUPPORTED);
|
|
}
|
|
|
|
GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
|
|
{
|
|
error_set(errp, QERR_UNSUPPORTED);
|
|
return NULL;
|
|
}
|
|
|
|
GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
|
|
{
|
|
error_set(errp, QERR_UNSUPPORTED);
|
|
return NULL;
|
|
}
|
|
|
|
int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
|
|
{
|
|
error_set(errp, QERR_UNSUPPORTED);
|
|
return -1;
|
|
}
|
|
|
|
#endif
|
|
|
|
#if !defined(CONFIG_FSFREEZE)
|
|
|
|
GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **err)
|
|
{
|
|
error_set(err, QERR_UNSUPPORTED);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int64_t qmp_guest_fsfreeze_freeze(Error **err)
|
|
{
|
|
error_set(err, QERR_UNSUPPORTED);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int64_t qmp_guest_fsfreeze_thaw(Error **err)
|
|
{
|
|
error_set(err, QERR_UNSUPPORTED);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_FSFREEZE */
|
|
|
|
#if !defined(CONFIG_FSTRIM)
|
|
void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **err)
|
|
{
|
|
error_set(err, QERR_UNSUPPORTED);
|
|
}
|
|
#endif
|
|
|
|
/* 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);
|
|
}
|