From: Eric Shelton <eshel...@pobox.com>
This patch creates an appropriate command line for the QEMU instance
running in a Linux-based stubdomain.
NOTE: a number of items are not currently implemented for Linux-based
stubdomains, such as:
- save/restore
- QMP socket
- graphics output (e.g., VNC)
Signed-off-by: Eric Shelton <eshel...@pobox.com>
Simon:
* fix disk path
* fix cdrom path and "format"
* pass downscript for network interfaces
Signed-off-by: Simon Gaiser <si...@invisiblethingslab.com>
[drop Qubes-specific parts]
Signed-off-by: Marek Marczykowski-Górecki <marma...@invisiblethingslab.com>
---
Changes in v2:
- fix serial specified with serial=[ ... ] syntax
- error out on multiple consoles (incompatible with stubdom)
- drop erroneous chunk about cdrom
Changes in v3:
- change to use libxl__stubdomain_is_linux instead of
b_info->stubdomain_version
- drop libxl__stubdomain_version_running, prefer
libxl__stubdomain_is_linux_running introduced by previous patch
- drop ifup/ifdown script - stubdomain will handle that with qemu
events itself
- slightly simplify -serial argument
- add support for multiple serial consoles, do not ignore
b_info.u.serial(_list)
- add error checking for more than 26 emulated disks ("/dev/xvd%c"
format string)
---
tools/libxl/libxl_create.c | 36 +++++++-
tools/libxl/libxl_dm.c | 190 ++++++++++++++++++++++++------------
tools/libxl/libxl_internal.h | 1 +-
tools/libxl/libxl_mem.c | 6 +-
tools/libxl/libxl_types.idl | 3 +-
5 files changed, 175 insertions(+), 61 deletions(-)
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 142b960..a6d40b7 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -169,6 +169,31 @@ int libxl__domain_build_info_setdefault(libxl__gc *gc,
}
}
+ if (b_info->type == LIBXL_DOMAIN_TYPE_HVM &&
+ libxl_defbool_val(b_info->device_model_stubdomain)) {
+ if (!b_info->stubdomain_kernel) {
+ switch (b_info->device_model_version) {
+ case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL:
+ b_info->stubdomain_kernel =
+ libxl__abs_path(NOGC, "ioemu-stubdom.gz",
libxl__xenfirmwaredir_path());
+ b_info->stubdomain_ramdisk = NULL;
+ break;
+ case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN:
+ b_info->stubdomain_kernel =
+ libxl__abs_path(NOGC,
+ "stubdom-linux-kernel",
+ libxl__xenfirmwaredir_path());
+ b_info->stubdomain_ramdisk =
+ libxl__abs_path(NOGC,
+ "stubdom-linux-rootfs",
+ libxl__xenfirmwaredir_path());
+ break;
+ default:
+ abort();
+ }
+ }
+ }
+
if (!b_info->max_vcpus)
b_info->max_vcpus = 1;
if (!b_info->avail_vcpus.size) {
@@ -204,6 +229,17 @@ int libxl__domain_build_info_setdefault(libxl__gc *gc,
if (b_info->target_memkb == LIBXL_MEMKB_DEFAULT)
b_info->target_memkb = b_info->max_memkb;
+ if (b_info->stubdomain_memkb == LIBXL_MEMKB_DEFAULT) {
+ if (libxl_defbool_val(b_info->device_model_stubdomain)) {
+ if (libxl__stubdomain_is_linux(b_info))
+ b_info->stubdomain_memkb = LIBXL_LINUX_STUBDOM_MEM * 1024;
+ else
+ b_info->stubdomain_memkb = 28 * 1024; // MiniOS
+ } else {
+ b_info->stubdomain_memkb = 0; // no stubdomain
+ }
+ }
+
libxl_defbool_setdefault(&b_info->claim_mode, false);
libxl_defbool_setdefault(&b_info->localtime, false);
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 558cb41..926d963 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1172,6 +1172,7 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
int i, connection, devid;
uint64_t ram_size;
const char *path, *chardev;
+ bool is_stubdom = libxl_defbool_val(b_info->device_model_stubdomain);
dm_args = flexarray_make(gc, 16, 1);
dm_envs = flexarray_make(gc, 16, 1);
@@ -1182,38 +1183,41 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
"-xen-domid",
GCSPRINTF("%d", guest_domid), NULL);
- flexarray_append(dm_args, "-chardev");
- if (state->dm_monitor_fd >= 0) {
- flexarray_append(dm_args,
- GCSPRINTF("socket,id=libxl-cmd,fd=%d,server,nowait",
- state->dm_monitor_fd));
+ /* There is currently no way to access the QMP socket in the stubdom */
+ if (!is_stubdom) {
+ flexarray_append(dm_args, "-chardev");
+ if (state->dm_monitor_fd >= 0) {
+ flexarray_append(dm_args,
+ GCSPRINTF("socket,id=libxl-cmd,fd=%d,server,nowait",
+ state->dm_monitor_fd));
- /*
- * Start QEMU with its "CPU" paused, it will not start any emulation
- * until the QMP command "cont" is used. This also prevent QEMU from
- * writing "running" to the "state" xenstore node so we only use this
- * flag when we have the QMP based startup notification.
- * */
- flexarray_append(dm_args, "-S");
- } else {
- flexarray_append(dm_args,
- GCSPRINTF("socket,id=libxl-cmd,"
- "path=%s,server,nowait",
- libxl__qemu_qmp_path(gc, guest_domid)));
- }
+ /*
+ * Start QEMU with its "CPU" paused, it will not start any
emulation
+ * until the QMP command "cont" is used. This also prevent QEMU
from
+ * writing "running" to the "state" xenstore node so we only use
this
+ * flag when we have the QMP based startup notification.
+ * */
+ flexarray_append(dm_args, "-S");
+ } else {
+ flexarray_append(dm_args,
+ GCSPRINTF("socket,id=libxl-cmd,"
+ "path=%s,server,nowait",
+ libxl__qemu_qmp_path(gc, guest_domid)));
+ }
- flexarray_append(dm_args, "-no-shutdown");
- flexarray_append(dm_args, "-mon");
- flexarray_append(dm_args, "chardev=libxl-cmd,mode=control");
+ flexarray_append(dm_args, "-no-shutdown");
+ flexarray_append(dm_args, "-mon");
+ flexarray_append(dm_args, "chardev=libxl-cmd,mode=control");
- flexarray_append(dm_args, "-chardev");
- flexarray_append(dm_args,
- GCSPRINTF("socket,id=libxenstat-cmd,"
- "path=%s/qmp-libxenstat-%d,server,nowait",
- libxl__run_dir_path(), guest_domid));
+ flexarray_append(dm_args, "-chardev");
+ flexarray_append(dm_args,
+ GCSPRINTF("socket,id=libxenstat-cmd,"
+
"path=%s/qmp-libxenstat-%d,server,nowait",
+ libxl__run_dir_path(), guest_domid));
- flexarray_append(dm_args, "-mon");
- flexarray_append(dm_args, "chardev=libxenstat-cmd,mode=control");
+ flexarray_append(dm_args, "-mon");
+ flexarray_append(dm_args, "chardev=libxenstat-cmd,mode=control");
+ }
for (i = 0; i < guest_config->num_channels; i++) {
connection = guest_config->channels[i].connection;
@@ -1257,7 +1261,7 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
flexarray_vappend(dm_args, "-name", c_info->name, NULL);
}
- if (vnc) {
+ if (vnc && !is_stubdom) {
char *vncarg = NULL;
flexarray_append(dm_args, "-vnc");
@@ -1296,7 +1300,7 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
}
flexarray_append(dm_args, vncarg);
- } else
+ } else if (!is_stubdom)
/*
* Ensure that by default no vnc server is created.
*/
@@ -1308,7 +1312,7 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
*/
flexarray_append_pair(dm_args, "-display", "none");
- if (sdl) {
+ if (sdl && !is_stubdom) {
flexarray_append(dm_args, "-sdl");
if (sdl->display)
flexarray_append_pair(dm_envs, "DISPLAY", sdl->display);
@@ -1350,18 +1354,34 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
{
LOGD(ERROR, guest_domid, "Both serial and serial_list set");
return ERROR_INVAL;
- }
- if (b_info->u.hvm.serial) {
- flexarray_vappend(dm_args,
- "-serial", b_info->u.hvm.serial, NULL);
- } else if (b_info->u.hvm.serial_list) {
- char **p;
- for (p = b_info->u.hvm.serial_list;
- *p;
- p++) {
- flexarray_vappend(dm_args,
- "-serial",
- *p, NULL);
+ } else {
+ if (b_info->u.hvm.serial) {
+ if (is_stubdom) {
+ /* see spawn_stub_launch_dm() for connecting
STUBDOM_CONSOLE_SERIAL */
+ flexarray_vappend(dm_args,
+ "-serial",
+ GCSPRINTF("/dev/hvc%d",
STUBDOM_CONSOLE_SERIAL),
+ NULL);
+ } else {
+ flexarray_vappend(dm_args,
+ "-serial", b_info->u.hvm.serial,
NULL);
+ }
+ } else if (b_info->u.hvm.serial_list) {
+ char **p;
+ /* see spawn_stub_launch_dm() for connecting
STUBDOM_CONSOLE_SERIAL */
+ for (p = b_info->u.hvm.serial_list, i = 0;
+ *p;
+ p++, i++) {
+ if (is_stubdom)
+ flexarray_vappend(dm_args,
+ "-serial",
+ GCSPRINTF("/dev/hvc%d",
STUBDOM_CONSOLE_SERIAL + i),
+ NULL);
+ else
+ flexarray_vappend(dm_args,
+ "-serial",
+ *p, NULL);
+ }
}
}
}
@@ -1370,7 +1390,7 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
flexarray_append(dm_args, "-nographic");
}
- if (libxl_defbool_val(b_info->u.hvm.spice.enable)) {
+ if (libxl_defbool_val(b_info->u.hvm.spice.enable) && !is_stubdom) {
const libxl_spice_info *spice = &b_info->u.hvm.spice;
char *spiceoptions = dm_spice_options(gc, spice);
if (!spiceoptions)
@@ -1797,7 +1817,9 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
* If qemu isn't doing the interpreting, the parameter is
* always raw
*/
- if (disks[i].backend == LIBXL_DISK_BACKEND_QDISK)
+ if (libxl_defbool_val(b_info->device_model_stubdomain))
+ format = "host_device";
+ else if (disks[i].backend == LIBXL_DISK_BACKEND_QDISK)
format = libxl__qemu_disk_format_string(disks[i].format);
else
format = libxl__qemu_disk_format_string(LIBXL_DISK_FORMAT_RAW);
@@ -1808,6 +1830,16 @@ static int libxl__build_device_model_args_new(libxl__gc
*gc,
disks[i].vdev);
continue;
}
+ } else if (libxl_defbool_val(b_info->device_model_stubdomain)) {
+ if (disk > 'z' - 'a') {
+ LOGD(WARN, guest_domid,
+ "Emulation of only first %d disks is supported
with qemu-xen in stubdomain.\n"
+ "Disk %d will be available via PV drivers but not
as an emulated disk.",
+ 'z' - 'a',
+ disk);
+ continue;
+ }
+ target_path = GCSPRINTF("/dev/xvd%c", 'a' + disk);
} else {
if (format == NULL) {
LOGD(WARN, guest_domid,
@@ -1948,7 +1980,7 @@ static int libxl__build_device_model_args(libxl__gc *gc,
char ***args, char ***envs,
const libxl__domain_build_state *state,
int *dm_state_fd)
-/* dm_state_fd may be NULL iff caller knows we are using old stubdom
+/* dm_state_fd may be NULL iff caller knows we are using stubdom
* and therefore will be passing a filename rather than a fd. */
{
switch (guest_config->b_info.device_model_version) {
@@ -1958,8 +1990,10 @@ static int libxl__build_device_model_args(libxl__gc *gc,
args, envs,
state);
case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN:
- assert(dm_state_fd != NULL);
- assert(*dm_state_fd < 0);
+ if (!libxl_defbool_val(guest_config->b_info.device_model_stubdomain)) {
+ assert(dm_state_fd != NULL);
+ assert(*dm_state_fd < 0);
+ }
return libxl__build_device_model_args_new(gc, dm,
guest_domid, guest_config,
args, envs,
@@ -2064,6 +2098,16 @@ retry_transaction:
return 0;
}
+static int libxl__store_libxl_entry(libxl__gc *gc, uint32_t domid,
+ const char *name, const char *value)
+{
+ char *path = NULL;
+
+ path = libxl__xs_libxl_path(gc, domid);
+ path = libxl__sprintf(gc, "%s/%s", path, name);
+ return libxl__xs_printf(gc, XBT_NULL, path, "%s", value);
+}
+
static void dmss_init(libxl__dm_spawn_state *dmss)
{
libxl__ev_qmp_init(&dmss->qmp);
@@ -2122,10 +2166,14 @@ void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state *sdss)
dmss_init(&sdss->pvqemu);
libxl__xswait_init(&sdss->xswait);
- if (guest_config->b_info.device_model_version !=
- LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL) {
- ret = ERROR_INVAL;
- goto out;
+ assert(libxl_defbool_val(guest_config->b_info.device_model_stubdomain));
+
+ if (libxl__stubdomain_is_linux(&guest_config->b_info)) {
+ if (d_state->saved_state) {
+ LOG(ERROR, "Save/Restore not supported yet with Linux Stubdom.");
+ ret = -1;
+ goto out;
+ }
}
sdss->pvqemu.guest_domid = 0;
@@ -2147,8 +2195,8 @@ void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state *sdss)
dm_config->b_info.shadow_memkb = 0;
dm_config->b_info.max_vcpus = 1;
- dm_config->b_info.max_memkb = 28 * 1024 +
- guest_config->b_info.video_memkb;
+ dm_config->b_info.max_memkb = guest_config->b_info.stubdomain_memkb;
+ dm_config->b_info.max_memkb += guest_config->b_info.video_memkb;
dm_config->b_info.target_memkb = dm_config->b_info.max_memkb;
dm_config->b_info.max_grant_frames = guest_config->b_info.max_grant_frames;
@@ -2187,10 +2235,8 @@ void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state *sdss)
dm_config->num_vkbs = 1;
}
- stubdom_state->pv_kernel.path
- = libxl__abs_path(gc, "ioemu-stubdom.gz",
libxl__xenfirmwaredir_path());
- stubdom_state->pv_cmdline = GCSPRINTF(" -d %d", guest_domid);
- stubdom_state->pv_ramdisk.path = "";
+ stubdom_state->pv_kernel.path = guest_config->b_info.stubdomain_kernel;
+ stubdom_state->pv_ramdisk.path = guest_config->b_info.stubdomain_ramdisk;
/* fixme: this function can leak the stubdom if it fails */
ret = libxl__domain_make(gc, dm_config, stubdom_state,
@@ -2210,6 +2256,8 @@ void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state *sdss)
goto out;
}
+ libxl__store_libxl_entry(gc, guest_domid, "dm-version",
+
libxl_device_model_version_to_string(dm_config->b_info.device_model_version));
libxl__write_stub_dmargs(gc, dm_domid, guest_domid, args);
libxl__xs_printf(gc, XBT_NULL,
GCSPRINTF("%s/image/device-model-domid",
@@ -2219,6 +2267,15 @@ void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state *sdss)
GCSPRINTF("%s/target",
libxl__xs_get_dompath(gc, dm_domid)),
"%d", guest_domid);
+ if (guest_config->b_info.device_model_version ==
LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN) {
+ /* qemu-xen is used as a dm in the stubdomain, so we set the bios
+ * accroding to this */
+ libxl__xs_printf(gc, XBT_NULL,
+ libxl__sprintf(gc, "%s/hvmloader/bios",
+ libxl__xs_get_dompath(gc, guest_domid)),
+ "%s",
+
libxl_bios_type_to_string(guest_config->b_info.u.hvm.bios));
+ }
ret = xc_domain_set_target(ctx->xch, dm_domid, guest_domid);
if (ret<0) {
LOGED(ERROR, guest_domid, "setting target domain %d -> %d",
@@ -2300,6 +2357,11 @@ static void spawn_stub_launch_dm(libxl__egc *egc,
if (guest_config->b_info.u.hvm.serial)
num_console++;
+ else if (guest_config->b_info.u.hvm.serial_list) {
+ char **serial = guest_config->b_info.u.hvm.serial_list;
+ while (*(serial++))
+ num_console++;
+ }
console = libxl__calloc(gc, num_console, sizeof(libxl__device_console));
@@ -2333,8 +2395,18 @@ static void spawn_stub_launch_dm(libxl__egc *egc,
console[i].output =
GCSPRINTF("pipe:%s", d_state->saved_state);
break;
+ case STUBDOM_CONSOLE_SERIAL:
+ if (guest_config->b_info.u.hvm.serial) {
+ console[i].output = guest_config->b_info.u.hvm.serial;
+ break;
+ }
+ /* fall-through */
default:
- console[i].output = "pty";
+ /* Serial_list is set, as otherwise num_consoles would be
+ * smaller and consoles 0-2 are handled above. */
+ assert(guest_config->b_info.u.hvm.serial_list);
+ console[i].output = guest_config->b_info.u.hvm.serial_list[
+ i-STUBDOM_CONSOLE_SERIAL];
break;
}
}
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index cc3cf26..2b4a1cc 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -119,6 +119,7 @@
#define STUBDOM_CONSOLE_RESTORE 2
#define STUBDOM_CONSOLE_SERIAL 3
#define STUBDOM_SPECIAL_CONSOLES 3
+#define LIBXL_LINUX_STUBDOM_MEM 128
#define TAP_DEVICE_SUFFIX "-emu"
#define DOMID_XS_PATH "domid"
#define INVALID_DOMID ~0
diff --git a/tools/libxl/libxl_mem.c b/tools/libxl/libxl_mem.c
index 7c01fac..65957a4 100644
--- a/tools/libxl/libxl_mem.c
+++ b/tools/libxl/libxl_mem.c
@@ -459,8 +459,10 @@ int libxl__domain_need_memory_calculate(libxl__gc *gc,
case LIBXL_DOMAIN_TYPE_PVH:
case LIBXL_DOMAIN_TYPE_HVM:
*need_memkb += LIBXL_HVM_EXTRA_MEMORY;
- if (libxl_defbool_val(b_info->device_model_stubdomain))
- *need_memkb += 32 * 1024;
+ if (libxl_defbool_val(b_info->device_model_stubdomain)) {
+ *need_memkb += b_info->stubdomain_memkb;
+ *need_memkb += b_info->video_memkb;
+ }
break;
case LIBXL_DOMAIN_TYPE_PV:
*need_memkb += LIBXL_PV_EXTRA_MEMORY;
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 7921950..011676f 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -516,6 +516,9 @@ libxl_domain_build_info = Struct("domain_build_info",[
("device_model_version", libxl_device_model_version),
("device_model_stubdomain", libxl_defbool),
+ ("stubdomain_memkb", MemKB),
+ ("stubdomain_kernel", string),
+ ("stubdomain_ramdisk", string),
# if you set device_model you must set device_model_version too
("device_model", string),
("device_model_ssidref", uint32),
--
git-series 0.9.1
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