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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 4/5] libxl: use new QEMU xenstore protocol
Originally both QEMU traditional and QEMU upstream used hardcoded
/local/domain/0 paths. This patch changes the protocol to use
/local/domain/$dm_domid path.
For QEMU traditional and upstream without stubdom, $dm_domid is 0 so
the path is in fact still /local/domain/0.
For QEMU traditional stubdom, this is incompatible protocol change.
However QEMU traditional is shipped with Xen so we are allowed to do
such change. This change needs to work with corresponding QEMU
traditional changeset.
There is no compatibility issue with QEMU upstream stubdom, because QEMU
upstream stubdom doesn't exist yet.
Watch /local/domain/$dm_domid/device-model/$domid/state, wait until
state turns "running" then unpause guest.
LIBXL_STUBDOM_START_TIMEOUT is the timeout used wait for stubdom to be
ready. My test on a very old machine (Core 2 6400) showed that it might
need more than 20s before the stubdom is ready to serve DomU.
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
Note:
Config.mk should be updated in this patch as well.
The patch to QEMU traditional can be found at
<1426243119-24591-1-git-send-email-wei.liu2@xxxxxxxxxx>
Changes in v3:
1. Fix a spot that didn't use new helper.
Changes in v2:
1. Use helper to generate xenstore path.
2. Fix xenstore permissions.
3. Squash patch to wait for stubdom here
3.1. Move libxl__xswait_init to right place.
3.2. Use helper to generate xenstore path.
3.3. Use only one libxl__xswait_stop.
---
tools/libxl/libxl.c | 4 +++-
tools/libxl/libxl_device.c | 4 +++-
tools/libxl/libxl_dm.c | 46 +++++++++++++++++++++++++++++++++---
tools/libxl/libxl_dom.c | 56 +++++++++++++++++++++++++++-----------------
tools/libxl/libxl_internal.h | 2 ++
tools/libxl/libxl_pci.c | 22 +++++++++--------
6 files changed, 98 insertions(+), 36 deletions(-)
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 75f1457..b8625b0 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1033,7 +1033,9 @@ int libxl_domain_unpause(libxl_ctx *ctx, uint32_t domid)
}
if (type == LIBXL_DOMAIN_TYPE_HVM) {
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/state",
domid);
+ uint32_t dm_domid = libxl_get_stubdom_id(ctx, domid);
+
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/state");
state = libxl__xs_read(gc, XBT_NULL, path);
if (state != NULL && !strcmp(state, "paused")) {
libxl__qemu_traditional_cmd(gc, domid, "continue");
diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 0f50d04..0c06dc4 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -1188,7 +1188,9 @@ int libxl__wait_for_device_model_deprecated(libxl__gc *gc,
void *check_callback_userdata)
{
char *path;
- path = GCSPRINTF("/local/domain/0/device-model/%d/state", domid);
+ uint32_t dm_domid = libxl_get_stubdom_id(CTX, domid);
+
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/state");
return libxl__xenstore_child_wait_deprecated(gc, domid,
LIBXL_DEVICE_MODEL_START_TIMEOUT,
"Device Model", path, state, spawning,
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index e0bbb39..ca34439 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1001,6 +1001,8 @@ static void stubdom_pvqemu_cb(libxl__egc *egc,
static void spawn_stubdom_pvqemu_destroy_cb(libxl__egc *egc,
libxl__destroy_domid_state *dis,
int rc);
+static void stubdom_xswait_cb(libxl__egc *egc, libxl__xswait_state *xswait,
+ int rc, const char *p);
char *libxl__stub_dm_name(libxl__gc *gc, const char *guest_name)
{
@@ -1130,9 +1132,10 @@ void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state *sdss)
retry_transaction:
t = xs_transaction_start(ctx->xsh);
xs_mkdir(ctx->xsh, t,
- libxl__sprintf(gc, "/local/domain/0/device-model/%d", guest_domid));
+ libxl__device_model_xs_path(gc, dm_domid, guest_domid, ""));
xs_set_permissions(ctx->xsh, t,
- libxl__sprintf(gc, "/local/domain/0/device-model/%d", guest_domid),
+ libxl__device_model_xs_path(gc, dm_domid,
+ guest_domid, ""),
perm, ARRAY_SIZE(perm));
if (!xs_transaction_end(ctx->xsh, t, 0))
if (errno == EAGAIN)
@@ -1278,6 +1281,8 @@ static void stubdom_pvqemu_cb(libxl__egc *egc,
STATE_AO_GC(sdss->dm.spawn.ao);
uint32_t dm_domid = sdss->pvqemu.guest_domid;
+ libxl__xswait_init(&sdss->xswait);
+
if (rc) {
LOGE(ERROR, "error connecting nics devices");
goto out;
@@ -1286,10 +1291,45 @@ static void stubdom_pvqemu_cb(libxl__egc *egc,
rc = libxl_domain_unpause(CTX, dm_domid);
if (rc) goto out;
+ sdss->xswait.ao = ao;
+ sdss->xswait.what = GCSPRINTF("Stubdom %u for %u startup",
+ dm_domid, sdss->dm.guest_domid);
+ sdss->xswait.path =
+ libxl__device_model_xs_path(gc, dm_domid, sdss->dm.guest_domid,
+ "/state");
+ sdss->xswait.timeout_ms = LIBXL_STUBDOM_START_TIMEOUT * 1000;
+ sdss->xswait.callback = stubdom_xswait_cb;
+ rc = libxl__xswait_start(gc, &sdss->xswait);
+ if (rc) goto out;
+
+ return;
+
+ out:
+ stubdom_xswait_cb(egc, &sdss->xswait, rc, NULL);
+}
+
+static void stubdom_xswait_cb(libxl__egc *egc, libxl__xswait_state *xswait,
+ int rc, const char *p)
+{
+ EGC_GC;
+ libxl__stub_dm_spawn_state *sdss = CONTAINER_OF(xswait, *sdss, xswait);
+ uint32_t dm_domid = sdss->pvqemu.guest_domid;
+
+ if (rc) {
+ if (rc == ERROR_TIMEDOUT)
+ LOG(ERROR, "%s: startup timed out", xswait->what);
+ goto out;
+ }
+
+ if (!p) return;
+
+ if (strcmp(p, "running"))
+ return;
out:
+ libxl__xswait_stop(gc, xswait);
if (rc) {
if (dm_domid) {
- sdss->dis.ao = ao;
+ sdss->dis.ao = sdss->dm.spawn.ao;
sdss->dis.domid = dm_domid;
sdss->dis.callback = spawn_stubdom_pvqemu_destroy_cb;
libxl__destroy_domid(egc, &sdss->dis);
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index a16d4a1..d18d52a 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -846,7 +846,8 @@ int libxl__qemu_traditional_cmd(libxl__gc *gc, uint32_t
domid,
const char *cmd)
{
char *path = NULL;
- path = GCSPRINTF("/local/domain/0/device-model/%d/command", domid);
+ uint32_t dm_domid = libxl_get_stubdom_id(CTX, domid);
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/command");
return libxl__xs_write(gc, XBT_NULL, path, "%s", cmd);
}
@@ -860,11 +861,13 @@ struct libxl__physmap_info {
#define TOOLSTACK_SAVE_VERSION 1
-static inline char *restore_helper(libxl__gc *gc, uint32_t domid,
- uint64_t phys_offset, char *node)
+static inline char *restore_helper(libxl__gc *gc, uint32_t dm_domid,
+ uint32_t domid,
+ uint64_t phys_offset, char *node)
{
- return GCSPRINTF("/local/domain/0/device-model/%d/physmap/%"PRIx64"/%s",
- domid, phys_offset, node);
+ return libxl__device_model_xs_path(gc, dm_domid, domid,
+ "/physmap/%"PRIx64"/%s",
+ phys_offset, node);
}
int libxl__toolstack_restore(uint32_t domid, const uint8_t *buf,
@@ -878,6 +881,7 @@ int libxl__toolstack_restore(uint32_t domid, const uint8_t
*buf,
uint32_t count = 0, version = 0;
struct libxl__physmap_info* pi;
char *xs_path;
+ uint32_t dm_domid;
LOG(DEBUG,"domain=%"PRIu32" toolstack data size=%"PRIu32, domid, size);
@@ -903,20 +907,23 @@ int libxl__toolstack_restore(uint32_t domid, const
uint8_t *buf,
return -1;
}
+ dm_domid = libxl_get_stubdom_id(CTX, domid);
for (i = 0; i < count; i++) {
pi = (struct libxl__physmap_info*) ptr;
ptr += sizeof(struct libxl__physmap_info) + pi->namelen;
- xs_path = restore_helper(gc, domid, pi->phys_offset, "start_addr");
+ xs_path = restore_helper(gc, dm_domid, domid,
+ pi->phys_offset, "start_addr");
ret = libxl__xs_write(gc, 0, xs_path, "%"PRIx64, pi->start_addr);
if (ret)
return -1;
- xs_path = restore_helper(gc, domid, pi->phys_offset, "size");
+ xs_path = restore_helper(gc, dm_domid, domid, pi->phys_offset, "size");
ret = libxl__xs_write(gc, 0, xs_path, "%"PRIx64, pi->size);
if (ret)
return -1;
if (pi->namelen > 0) {
- xs_path = restore_helper(gc, domid, pi->phys_offset, "name");
+ xs_path = restore_helper(gc, dm_domid, domid,
+ pi->phys_offset, "name");
ret = libxl__xs_write(gc, 0, xs_path, "%s", pi->name);
if (ret)
return -1;
@@ -969,10 +976,11 @@ static void
domain_suspend_switch_qemu_xen_traditional_logdirty
const char *got;
if (!lds->cmd_path) {
- lds->cmd_path = GCSPRINTF(
- "/local/domain/0/device-model/%u/logdirty/cmd", domid);
- lds->ret_path = GCSPRINTF(
- "/local/domain/0/device-model/%u/logdirty/ret", domid);
+ uint32_t dm_domid = libxl_get_stubdom_id(CTX, domid);
+ lds->cmd_path = libxl__device_model_xs_path(gc, dm_domid, domid,
+ "/logdirty/cmd");
+ lds->ret_path = libxl__device_model_xs_path(gc, dm_domid, domid,
+ "/logdirty/ret");
}
lds->cmd = enable ? "enable" : "disable";
@@ -1491,11 +1499,13 @@ static void domain_suspend_common_done(libxl__egc *egc,
dss->callback_common_done(egc, dss, ok);
}
-static inline char *physmap_path(libxl__gc *gc, uint32_t domid,
- char *phys_offset, char *node)
+static inline char *physmap_path(libxl__gc *gc, uint32_t dm_domid,
+ uint32_t domid,
+ char *phys_offset, char *node)
{
- return GCSPRINTF("/local/domain/0/device-model/%d/physmap/%s/%s",
- domid, phys_offset, node);
+ return libxl__device_model_xs_path(gc, dm_domid, domid,
+ "/physmap/%s/%s",
+ phys_offset, node);
}
int libxl__toolstack_save(uint32_t domid, uint8_t **buf,
@@ -1510,9 +1520,13 @@ int libxl__toolstack_save(uint32_t domid, uint8_t **buf,
uint8_t *ptr = NULL;
char **entries = NULL;
struct libxl__physmap_info *pi;
+ uint32_t dm_domid;
+
+ dm_domid = libxl_get_stubdom_id(CTX, domid);
- entries = libxl__xs_directory(gc, 0, GCSPRINTF(
- "/local/domain/0/device-model/%d/physmap", domid), &num);
+ entries = libxl__xs_directory(gc, 0,
+ libxl__device_model_xs_path(gc, dm_domid, domid, "/physmap"),
+ &num);
count = num;
*len = sizeof(version) + sizeof(count);
@@ -1535,21 +1549,21 @@ int libxl__toolstack_save(uint32_t domid, uint8_t **buf,
return -1;
}
- xs_path = physmap_path(gc, domid, phys_offset, "start_addr");
+ xs_path = physmap_path(gc, dm_domid, domid, phys_offset, "start_addr");
start_addr = libxl__xs_read(gc, 0, xs_path);
if (start_addr == NULL) {
LOG(ERROR, "%s is NULL", xs_path);
return -1;
}
- xs_path = physmap_path(gc, domid, phys_offset, "size");
+ xs_path = physmap_path(gc, dm_domid, domid, phys_offset, "size");
size = libxl__xs_read(gc, 0, xs_path);
if (size == NULL) {
LOG(ERROR, "%s is NULL", xs_path);
return -1;
}
- xs_path = physmap_path(gc, domid, phys_offset, "name");
+ xs_path = physmap_path(gc, dm_domid, domid, phys_offset, "name");
name = libxl__xs_read(gc, 0, xs_path);
if (name == NULL)
namelen = 0;
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 2f952d4..1e9ee59 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -86,6 +86,7 @@
#define LIBXL_DESTROY_TIMEOUT 10
#define LIBXL_HOTPLUG_TIMEOUT 10
#define LIBXL_DEVICE_MODEL_START_TIMEOUT 10
+#define LIBXL_STUBDOM_START_TIMEOUT 30
#define LIBXL_QEMU_BODGE_TIMEOUT 2
#define LIBXL_XENCONSOLE_LIMIT 1048576
#define LIBXL_XENCONSOLE_PROTOCOL "vt100"
@@ -3048,6 +3049,7 @@ typedef struct {
libxl__dm_spawn_state pvqemu;
libxl__destroy_domid_state dis;
libxl__multidev multidev;
+ libxl__xswait_state xswait;
} libxl__stub_dm_spawn_state;
_hidden void libxl__spawn_stub_dm(libxl__egc *egc,
libxl__stub_dm_spawn_state*);
diff --git a/tools/libxl/libxl_pci.c b/tools/libxl/libxl_pci.c
index f3ae132..394f61c 100644
--- a/tools/libxl/libxl_pci.c
+++ b/tools/libxl/libxl_pci.c
@@ -850,11 +850,12 @@ static int qemu_pci_add_xenstore(libxl__gc *gc, uint32_t
domid,
int rc = 0;
char *path;
char *state, *vdevfn;
+ uint32_t dm_domid;
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/state", domid);
+ dm_domid = libxl_get_stubdom_id(CTX, domid);
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/state");
state = libxl__xs_read(gc, XBT_NULL, path);
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/parameter",
- domid);
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/parameter");
if (pcidev->vdevfn) {
libxl__xs_write(gc, XBT_NULL, path, PCI_BDF_VDEVFN","PCI_OPTIONS,
pcidev->domain, pcidev->bus, pcidev->dev,
@@ -869,11 +870,9 @@ static int qemu_pci_add_xenstore(libxl__gc *gc, uint32_t
domid,
libxl__qemu_traditional_cmd(gc, domid, "pci-ins");
rc = libxl__wait_for_device_model_deprecated(gc, domid, NULL, NULL,
pci_ins_check, state);
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/parameter",
- domid);
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/parameter");
vdevfn = libxl__xs_read(gc, XBT_NULL, path);
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/state",
- domid);
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/state");
if ( rc < 0 )
LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
"qemu refused to add device: %s", vdevfn);
@@ -1175,10 +1174,13 @@ static int qemu_pci_remove_xenstore(libxl__gc *gc,
uint32_t domid,
libxl_ctx *ctx = libxl__gc_owner(gc);
char *state;
char *path;
+ uint32_t dm_domid;
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/state", domid);
+ dm_domid = libxl_get_stubdom_id(CTX, domid);
+
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/state");
state = libxl__xs_read(gc, XBT_NULL, path);
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/parameter",
domid);
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/parameter");
libxl__xs_write(gc, XBT_NULL, path, PCI_BDF, pcidev->domain,
pcidev->bus, pcidev->dev, pcidev->func);
@@ -1196,7 +1198,7 @@ static int qemu_pci_remove_xenstore(libxl__gc *gc,
uint32_t domid,
return ERROR_FAIL;
}
}
- path = libxl__sprintf(gc, "/local/domain/0/device-model/%d/state", domid);
+ path = libxl__device_model_xs_path(gc, dm_domid, domid, "/state");
xs_write(ctx->xsh, XBT_NULL, path, state, strlen(state));
return 0;
--
1.9.1
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