void libxl__spawn_local_dm(libxl__egc *egc, libxl__dm_spawn_state *dmss) { /* convenience aliases */ const int domid = dmss->guest_domid; libxl__domain_build_state *const state = dmss->build_state; libxl__spawn_state *const spawn = &dmss->spawn; STATE_AO_GC(dmss->spawn.ao); libxl_ctx *ctx = CTX; libxl_domain_config *guest_config = dmss->guest_config; const libxl_domain_create_info *c_info = &guest_config->c_info; const libxl_domain_build_info *b_info = &guest_config->b_info; const libxl_vnc_info *vnc = libxl__dm_vnc(guest_config); char *path, *logfile; int logfile_w, null; int rc; char **args, **arg; xs_transaction_t t; char *vm_path; char **pass_stuff; const char *dm; if (libxl_defbool_val(b_info->device_model_stubdomain)) { abort(); } dm = libxl__domain_device_model(gc, b_info); if (!dm) { rc = ERROR_FAIL; goto out; } if (access(dm, X_OK) < 0) { LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "device model %s is not executable", dm); rc = ERROR_FAIL; goto out; } args = libxl__build_device_model_args(gc, dm, domid, guest_config, state); if (!args) { rc = ERROR_FAIL; goto out; } if (b_info->type == LIBXL_DOMAIN_TYPE_HVM) { path = xs_get_domain_path(ctx->xsh, domid); libxl__xs_write(gc, XBT_NULL, libxl__sprintf(gc, "%s/hvmloader/bios", path), "%s", libxl_bios_type_to_string(b_info->u.hvm.bios)); /* Disable relocating memory to make the MMIO hole larger * unless we're running qemu-traditional */ libxl__xs_write(gc, XBT_NULL, libxl__sprintf(gc, "%s/hvmloader/allow-memory-relocate", path), "%d", b_info->device_model_version==LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL); free(path); } path = libxl__sprintf(gc, "/local/domain/0/device-model/%d", domid); xs_mkdir(ctx->xsh, XBT_NULL, path); if (b_info->type == LIBXL_DOMAIN_TYPE_HVM && b_info->device_model_version == LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL) libxl__xs_write(gc, XBT_NULL, libxl__sprintf(gc, "%s/disable_pf", path), "%d", !libxl_defbool_val(b_info->u.hvm.xen_platform_pci)); libxl_create_logfile(ctx, libxl__sprintf(gc, "qemu-dm-%s", c_info->name), &logfile); logfile_w = open(logfile, O_WRONLY|O_CREAT|O_APPEND, 0644); free(logfile); null = open("/dev/null", O_RDONLY); const char *dom_path = libxl__xs_get_dompath(gc, domid); spawn->pidpath = GCSPRINTF("%s/%s", dom_path, "image/device-model-pid"); if (vnc && vnc->passwd) { /* This xenstore key will only be used by qemu-xen-traditionnal. * The code to supply vncpasswd to qemu-xen is later. */ retry_transaction: /* Find uuid and the write the vnc password to xenstore for qemu. */ t = xs_transaction_start(ctx->xsh); vm_path = libxl__xs_read(gc,t,libxl__sprintf(gc, "%s/vm", dom_path)); if (vm_path) { /* Now write the vncpassword into it. */ pass_stuff = libxl__calloc(gc, 3, sizeof(char *)); pass_stuff[0] = "vncpasswd"; pass_stuff[1] = vnc->passwd; libxl__xs_writev(gc,t,vm_path,pass_stuff); if (!xs_transaction_end(ctx->xsh, t, 0)) if (errno == EAGAIN) goto retry_transaction; } } LIBXL__LOG(CTX, XTL_DEBUG, "Spawning device-model %s with arguments:", dm); for (arg = args; *arg; arg++) LIBXL__LOG(CTX, XTL_DEBUG, " %s", *arg); spawn->what = GCSPRINTF("domain %d device model", domid); spawn->xspath = GCSPRINTF("/local/domain/0/device-model/%d/state", domid); spawn->timeout_ms = LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000; spawn->pidpath = GCSPRINTF("%s/image/device-model-pid", dom_path); spawn->midproc_cb = libxl__spawn_record_pid; spawn->confirm_cb = device_model_confirm; spawn->failure_cb = device_model_startup_failed; spawn->detached_cb = device_model_detached; rc = libxl__spawn_spawn(egc, spawn); if (rc < 0) goto out_close; if (!rc) { /* inner child */ setsid(); libxl__exec(gc, null, logfile_w, logfile_w, dm, args, NULL); } rc = 0; out_close: close(null); close(logfile_w); out: if (rc) device_model_spawn_outcome(egc, dmss, rc); }
int libxl__create_device_model(libxl_ctx *ctx, libxl_device_model_info *info, libxl_device_disk *disks, int num_disks, libxl_device_nic *vifs, int num_vifs, libxl__device_model_starting **starting_r) { libxl__gc gc = LIBXL_INIT_GC(ctx); char *path, *logfile; int logfile_w, null; int rc; char **args; libxl__device_model_starting buf_starting, *p; xs_transaction_t t; char *vm_path; char **pass_stuff; if (strstr(info->device_model, "stubdom-dm")) { libxl_device_vfb vfb; libxl_device_vkb vkb; libxl_vfb_and_vkb_from_device_model_info(ctx, info, &vfb, &vkb); rc = libxl_create_stubdom(ctx, info, disks, num_disks, vifs, num_vifs, &vfb, &vkb, starting_r); goto out; } args = libxl_build_device_model_args(&gc, info, vifs, num_vifs); if (!args) { rc = ERROR_FAIL; goto out; } path = libxl__sprintf(&gc, "/local/domain/0/device-model/%d", info->domid); xs_mkdir(ctx->xsh, XBT_NULL, path); libxl__xs_write(&gc, XBT_NULL, libxl__sprintf(&gc, "%s/disable_pf", path), "%d", !info->xen_platform_pci); libxl_create_logfile(ctx, libxl__sprintf(&gc, "qemu-dm-%s", info->dom_name), &logfile); logfile_w = open(logfile, O_WRONLY|O_CREAT, 0644); free(logfile); null = open("/dev/null", O_RDONLY); if (starting_r) { rc = ERROR_NOMEM; *starting_r = calloc(sizeof(libxl__device_model_starting), 1); if (!*starting_r) goto out_close; p = *starting_r; p->for_spawn = calloc(sizeof(libxl__spawn_starting), 1); } else { p = &buf_starting; p->for_spawn = NULL; } p->domid = info->domid; p->dom_path = libxl__xs_get_dompath(&gc, info->domid); if (!p->dom_path) { rc = ERROR_FAIL; goto out_close; } if (info->vncpasswd) { retry_transaction: /* Find uuid and the write the vnc password to xenstore for qemu. */ t = xs_transaction_start(ctx->xsh); vm_path = libxl__xs_read(&gc,t,libxl__sprintf(&gc, "%s/vm", p->dom_path)); if (vm_path) { /* Now write the vncpassword into it. */ pass_stuff = libxl__calloc(&gc, 3, sizeof(char *)); pass_stuff[0] = "vncpasswd"; pass_stuff[1] = info->vncpasswd; libxl__xs_writev(&gc,t,vm_path,pass_stuff); if (!xs_transaction_end(ctx->xsh, t, 0)) if (errno == EAGAIN) goto retry_transaction; } } rc = libxl__spawn_spawn(ctx, p, "device model", dm_xenstore_record_pid); if (rc < 0) goto out_close; if (!rc) { /* inner child */ setsid(); libxl__exec(null, logfile_w, logfile_w, libxl__abs_path(&gc, info->device_model, libxl_libexec_path()), args); } rc = 0; out_close: close(null); close(logfile_w); free(args); out: libxl__free_all(&gc); return rc; }