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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC/v2] libxl: postpone backend name resolution
This replaces the backend_domid field in libxl devices with a structure
allowing either a domid or a domain name to be specified. The domain
name is resolved into a domain ID in the _setdefault function when
adding the device. This change allows the backend of the block devices
to be specified (which previously required passing the libxl_ctx down
into the block device parser).
Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
This patch does not include the changes to tools/libxl/libxlu_disk_l.c
and tools/libxl/libxlu_disk_l.h because the diffs contain unrelated
changes due to different generator versions.
docs/misc/xl-disk-configuration.txt | 12 +++++++
tools/libxl/libxl.c | 65 +++++++++++++++++++++++++------------
tools/libxl/libxl_dm.c | 6 ++--
tools/libxl/libxl_types.idl | 15 ++++++---
tools/libxl/libxl_utils.c | 2 +-
tools/libxl/libxlu_disk_l.l | 1 +
tools/libxl/xl_cmdimpl.c | 36 ++++----------------
tools/libxl/xl_sxp.c | 6 ++--
8 files changed, 82 insertions(+), 61 deletions(-)
diff --git a/docs/misc/xl-disk-configuration.txt
b/docs/misc/xl-disk-configuration.txt
index 86c16be..5bd456d 100644
--- a/docs/misc/xl-disk-configuration.txt
+++ b/docs/misc/xl-disk-configuration.txt
@@ -139,6 +139,18 @@ cdrom
Convenience alias for "devtype=cdrom".
+backend=<domain-name>
+---------------------
+
+Description: Designates a backend domain for the device
+Supported values: Valid domain names
+Mandatory: No
+
+Specifies the backend domain which this device should attach to. This
+defaults to domain 0. Specifying another domain requires setting up a
+driver domain which is outside the scope of this document.
+
+
backendtype=<backend-type>
--------------------------
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 6c4455e..edb29b3 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1153,7 +1153,7 @@ static void disk_eject_xswatch_callback(libxl__egc *egc,
libxl__ev_xswatch *w,
sscanf(backend,
"/local/domain/%d/backend/%" TOSTRING(BACKEND_STRING_SIZE)
"[a-z]/%*d/%*d",
- &disk->backend_domid, backend_type);
+ &disk->backend_domain.domid, backend_type);
if (!strcmp(backend_type, "tap") || !strcmp(backend_type, "vbd")) {
disk->backend = LIBXL_DISK_BACKEND_TAP;
} else if (!strcmp(backend_type, "qdisk")) {
@@ -1710,13 +1710,36 @@ out:
return;
}
+/* backend domain name-to-domid conversion utility */
+static int libxl__resolve_domain(libxl__gc *gc, struct libxl_domain_desc *desc)
+{
+ int i, rv;
+ const char *name = desc->name;
+ if (!name)
+ return 0;
+ for (i=0; name[i]; i++) {
+ if (!isdigit(name[i])) {
+ rv = libxl_name_to_domid(libxl__gc_owner(gc), name, &desc->domid);
+ if (rv)
+ return rv;
+ goto resolved;
+ }
+ }
+ desc->domid = atoi(name);
+
+ resolved:
+ free(desc->name);
+ desc->name = NULL;
+ return 0;
+}
+
/******************************************************************************/
int libxl__device_vtpm_setdefault(libxl__gc *gc, libxl_device_vtpm *vtpm)
{
if(libxl_uuid_is_nil(&vtpm->uuid)) {
libxl_uuid_generate(&vtpm->uuid);
}
- return 0;
+ return libxl__resolve_domain(gc, &vtpm->backend_domain);
}
static int libxl__device_from_vtpm(libxl__gc *gc, uint32_t domid,
@@ -1724,7 +1747,7 @@ static int libxl__device_from_vtpm(libxl__gc *gc,
uint32_t domid,
libxl__device *device)
{
device->backend_devid = vtpm->devid;
- device->backend_domid = vtpm->backend_domid;
+ device->backend_domid = vtpm->backend_domain.domid;
device->backend_kind = LIBXL__DEVICE_KIND_VTPM;
device->devid = vtpm->devid;
device->domid = domid;
@@ -1783,7 +1806,7 @@ void libxl__device_vtpm_add(libxl__egc *egc, uint32_t
domid,
flexarray_append(back, "False");
flexarray_append(front, "backend-id");
- flexarray_append(front, GCSPRINTF("%d", vtpm->backend_domid));
+ flexarray_append(front, GCSPRINTF("%d", vtpm->backend_domain.domid));
flexarray_append(front, "state");
flexarray_append(front, GCSPRINTF("%d", 1));
flexarray_append(front, "handle");
@@ -1832,7 +1855,7 @@ libxl_device_vtpm *libxl_device_vtpm_list(libxl_ctx *ctx,
uint32_t domid, int *n
tmp = libxl__xs_read(gc, XBT_NULL,
GCSPRINTF("%s/%s/backend_id",
fe_path, *dir));
- vtpm->backend_domid = atoi(tmp);
+ vtpm->backend_domain.domid = atoi(tmp);
tmp = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/uuid", be_path));
if(tmp) {
@@ -1934,7 +1957,7 @@ int libxl_devid_to_device_vtpm(libxl_ctx *ctx,
rc = 1;
for (i = 0; i < nb; ++i) {
if(devid == vtpms[i].devid) {
- vtpm->backend_domid = vtpms[i].backend_domid;
+ vtpm->backend_domain.domid = vtpms[i].backend_domain.domid;
vtpm->devid = vtpms[i].devid;
libxl_uuid_copy(&vtpm->uuid, &vtpms[i].uuid);
rc = 0;
@@ -1956,7 +1979,7 @@ int libxl__device_disk_setdefault(libxl__gc *gc,
libxl_device_disk *disk)
rc = libxl__device_disk_set_backend(gc, disk);
if (rc) return rc;
- return rc;
+ return libxl__resolve_domain(gc, &disk->backend_domain);
}
int libxl__device_from_disk(libxl__gc *gc, uint32_t domid,
@@ -1973,7 +1996,7 @@ int libxl__device_from_disk(libxl__gc *gc, uint32_t domid,
return ERROR_INVAL;
}
- device->backend_domid = disk->backend_domid;
+ device->backend_domid = disk->backend_domain.domid;
device->backend_devid = devid;
switch (disk->backend) {
@@ -2133,7 +2156,7 @@ static void device_disk_add(libxl__egc *egc, uint32_t
domid,
flexarray_append(back, disk->is_cdrom ? "cdrom" : "disk");
flexarray_append(front, "backend-id");
- flexarray_append(front, libxl__sprintf(gc, "%d", disk->backend_domid));
+ flexarray_append(front, libxl__sprintf(gc, "%d",
disk->backend_domain.domid));
flexarray_append(front, "state");
flexarray_append(front, libxl__sprintf(gc, "%d", 1));
flexarray_append(front, "virtual-device");
@@ -2298,7 +2321,7 @@ static int libxl__append_disk_list_of_type(libxl__gc *gc,
p = libxl__sprintf(gc, "%s/%s", be_path, *dir);
if ((rc=libxl__device_disk_from_xs_be(gc, p, pdisk)))
goto out;
- pdisk->backend_domid = 0;
+ pdisk->backend_domain.domid = 0;
*ndisks += 1;
}
}
@@ -2759,7 +2782,7 @@ int libxl__device_nic_setdefault(libxl__gc *gc,
libxl_device_nic *nic,
LOG(ERROR, "unable to get current hotplug scripts execution setting");
return run_hotplug_scripts;
}
- if (nic->backend_domid != LIBXL_TOOLSTACK_DOMID && run_hotplug_scripts) {
+ if (nic->backend_domain.domid != LIBXL_TOOLSTACK_DOMID &&
run_hotplug_scripts) {
LOG(ERROR, "cannot use a backend domain different than %d if"
"hotplug scripts are executed from libxl",
LIBXL_TOOLSTACK_DOMID);
@@ -2784,7 +2807,7 @@ int libxl__device_nic_setdefault(libxl__gc *gc,
libxl_device_nic *nic,
abort();
}
- return 0;
+ return libxl__resolve_domain(gc, &nic->backend_domain);
}
static int libxl__device_from_nic(libxl__gc *gc, uint32_t domid,
@@ -2792,7 +2815,7 @@ static int libxl__device_from_nic(libxl__gc *gc, uint32_t
domid,
libxl__device *device)
{
device->backend_devid = nic->devid;
- device->backend_domid = nic->backend_domid;
+ device->backend_domid = nic->backend_domain.domid;
device->backend_kind = LIBXL__DEVICE_KIND_VIF;
device->devid = nic->devid;
device->domid = domid;
@@ -2874,7 +2897,7 @@ void libxl__device_nic_add(libxl__egc *egc, uint32_t
domid,
libxl_nic_type_to_string(nic->nictype)));
flexarray_append(front, "backend-id");
- flexarray_append(front, libxl__sprintf(gc, "%d", nic->backend_domid));
+ flexarray_append(front, libxl__sprintf(gc, "%d",
nic->backend_domain.domid));
flexarray_append(front, "state");
flexarray_append(front, libxl__sprintf(gc, "%d", 1));
flexarray_append(front, "handle");
@@ -2991,7 +3014,7 @@ static int libxl__append_nic_list_of_type(libxl__gc *gc,
const char *p;
p = libxl__sprintf(gc, "%s/%s", be_path, *dir);
libxl__device_nic_from_xs_be(gc, p, pnic);
- pnic->backend_domid = 0;
+ pnic->backend_domain.domid = 0;
}
}
return 0;
@@ -3144,7 +3167,7 @@ out:
int libxl__device_vkb_setdefault(libxl__gc *gc, libxl_device_vkb *vkb)
{
- return 0;
+ return libxl__resolve_domain(gc, &vkb->backend_domain);
}
static int libxl__device_from_vkb(libxl__gc *gc, uint32_t domid,
@@ -3152,7 +3175,7 @@ static int libxl__device_from_vkb(libxl__gc *gc, uint32_t
domid,
libxl__device *device)
{
device->backend_devid = vkb->devid;
- device->backend_domid = vkb->backend_domid;
+ device->backend_domid = vkb->backend_domain.domid;
device->backend_kind = LIBXL__DEVICE_KIND_VKBD;
device->devid = vkb->devid;
device->domid = domid;
@@ -3205,7 +3228,7 @@ int libxl__device_vkb_add(libxl__gc *gc, uint32_t domid,
flexarray_append(back, libxl__domid_to_name(gc, domid));
flexarray_append(front, "backend-id");
- flexarray_append(front, libxl__sprintf(gc, "%d", vkb->backend_domid));
+ flexarray_append(front, libxl__sprintf(gc, "%d",
vkb->backend_domain.domid));
flexarray_append(front, "state");
flexarray_append(front, libxl__sprintf(gc, "%d", 1));
@@ -3236,7 +3259,7 @@ int libxl__device_vfb_setdefault(libxl__gc *gc,
libxl_device_vfb *vfb)
libxl_defbool_setdefault(&vfb->sdl.enable, false);
libxl_defbool_setdefault(&vfb->sdl.opengl, false);
- return 0;
+ return libxl__resolve_domain(gc, &vfb->backend_domain);
}
static int libxl__device_from_vfb(libxl__gc *gc, uint32_t domid,
@@ -3244,7 +3267,7 @@ static int libxl__device_from_vfb(libxl__gc *gc, uint32_t
domid,
libxl__device *device)
{
device->backend_devid = vfb->devid;
- device->backend_domid = vfb->backend_domid;
+ device->backend_domid = vfb->backend_domain.domid;
device->backend_kind = LIBXL__DEVICE_KIND_VFB;
device->devid = vfb->devid;
device->domid = domid;
@@ -3309,7 +3332,7 @@ int libxl__device_vfb_add(libxl__gc *gc, uint32_t domid,
libxl_device_vfb *vfb)
}
flexarray_append_pair(front, "backend-id",
- libxl__sprintf(gc, "%d", vfb->backend_domid));
+ libxl__sprintf(gc, "%d", vfb->backend_domain.domid));
flexarray_append_pair(front, "state", libxl__sprintf(gc, "%d", 1));
libxl__device_generic_add(gc, XBT_NULL, &device,
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index c036dc1..82a55ea 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -644,13 +644,15 @@ static int
libxl__vfb_and_vkb_from_hvm_guest_config(libxl__gc *gc,
libxl_device_vfb_init(vfb);
libxl_device_vkb_init(vkb);
- vfb->backend_domid = 0;
+ vfb->backend_domain.domid = 0;
+ vfb->backend_domain.name = NULL;
vfb->devid = 0;
vfb->vnc = b_info->u.hvm.vnc;
vfb->keymap = b_info->u.hvm.keymap;
vfb->sdl = b_info->u.hvm.sdl;
- vkb->backend_domid = 0;
+ vkb->backend_domain.domid = 0;
+ vkb->backend_domain.name = NULL;
vkb->devid = 0;
return 0;
}
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 93524f0..6ec7967 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -136,6 +136,11 @@ libxl_vga_interface_type =
Enumeration("vga_interface_type", [
# Complex libxl types
#
+libxl_domain_desc = Struct("domain_desc", [
+ ("domid", libxl_domid),
+ ("name", string),
+ ])
+
libxl_ioport_range = Struct("ioport_range", [
("first", uint32),
("number", uint32),
@@ -344,7 +349,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
)
libxl_device_vfb = Struct("device_vfb", [
- ("backend_domid", libxl_domid),
+ ("backend_domain",libxl_domain_desc),
("devid", libxl_devid),
("vnc", libxl_vnc_info),
("sdl", libxl_sdl_info),
@@ -353,12 +358,12 @@ libxl_device_vfb = Struct("device_vfb", [
])
libxl_device_vkb = Struct("device_vkb", [
- ("backend_domid", libxl_domid),
+ ("backend_domain", libxl_domain_desc),
("devid", libxl_devid),
])
libxl_device_disk = Struct("device_disk", [
- ("backend_domid", libxl_domid),
+ ("backend_domain", libxl_domain_desc),
("pdev_path", string),
("vdev", string),
("backend", libxl_disk_backend),
@@ -370,7 +375,7 @@ libxl_device_disk = Struct("device_disk", [
])
libxl_device_nic = Struct("device_nic", [
- ("backend_domid", libxl_domid),
+ ("backend_domain", libxl_domain_desc),
("devid", libxl_devid),
("mtu", integer),
("model", string),
@@ -397,7 +402,7 @@ libxl_device_pci = Struct("device_pci", [
])
libxl_device_vtpm = Struct("device_vtpm", [
- ("backend_domid", libxl_domid),
+ ("backend_domain", libxl_domain_desc),
("devid", libxl_devid),
("uuid", libxl_uuid),
])
diff --git a/tools/libxl/libxl_utils.c b/tools/libxl/libxl_utils.c
index 8f78790..86a310e 100644
--- a/tools/libxl/libxl_utils.c
+++ b/tools/libxl/libxl_utils.c
@@ -478,7 +478,7 @@ int libxl_uuid_to_device_vtpm(libxl_ctx *ctx, uint32_t
domid,
rc = 1;
for (i = 0; i < nb; ++i) {
if(!libxl_uuid_compare(uuid, &vtpms[i].uuid)) {
- vtpm->backend_domid = vtpms[i].backend_domid;
+ vtpm->backend_domain.domid = vtpms[i].backend_domain.domid;
vtpm->devid = vtpms[i].devid;
libxl_uuid_copy(&vtpm->uuid, &vtpms[i].uuid);
rc = 0;
diff --git a/tools/libxl/libxlu_disk_l.l b/tools/libxl/libxlu_disk_l.l
index bee16a1..a65030f 100644
--- a/tools/libxl/libxlu_disk_l.l
+++ b/tools/libxl/libxlu_disk_l.l
@@ -168,6 +168,7 @@ devtype=disk,? { DPC->disk->is_cdrom = 0; }
devtype=[^,]*,? { xlu__disk_err(DPC,yytext,"unknown value for type"); }
access=[^,]*,? { STRIP(','); setaccess(DPC, FROMEQUALS); }
+backend=[^,]*,? { STRIP(','); SAVESTRING("backend", backend_domain.name,
FROMEQUALS); }
backendtype=[^,]*,? { STRIP(','); setbackendtype(DPC,FROMEQUALS); }
vdev=[^,]*,? { STRIP(','); SAVESTRING("vdev", vdev, FROMEQUALS); }
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index e964bf1..bc22f3c 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -1090,12 +1090,7 @@ static void parse_config_data(const char *config_source,
break;
*p2 = '\0';
if (!strcmp(p, "backend")) {
- if(domain_qualifier_to_domid(p2 + 1,
&(vtpm->backend_domid), 0))
- {
- fprintf(stderr,
- "Specified vtpm backend domain `%s' does not
exist!\n", p2 + 1);
- exit(1);
- }
+ vtpm->backend_domain.name = strdup(p2 + 1);
got_backend = true;
} else if(!strcmp(p, "uuid")) {
if( libxl_uuid_from_string(&vtpm->uuid, p2 + 1) ) {
@@ -1190,11 +1185,8 @@ static void parse_config_data(const char *config_source,
free(nic->ifname);
nic->ifname = strdup(p2 + 1);
} else if (!strcmp(p, "backend")) {
- if(libxl_name_to_domid(ctx, (p2 + 1),
&(nic->backend_domid))) {
- fprintf(stderr, "Specified backend domain does not
exist, defaulting to Dom0\n");
- nic->backend_domid = 0;
- }
- if (nic->backend_domid != 0 && run_hotplug_scripts) {
+ nic->backend_domain.name = strdup(p2 + 1);
+ if (run_hotplug_scripts) {
fprintf(stderr, "ERROR: the vif 'backend=' option "
"cannot be used in conjunction with "
"run_hotplug_scripts, please set "
@@ -2431,8 +2423,6 @@ static void cd_insert(uint32_t domid, const char
*virtdev, char *phys)
parse_disk_config(&config, buf, &disk);
- disk.backend_domid = 0;
-
libxl_cdrom_insert(ctx, domid, &disk, NULL);
libxl_device_disk_dispose(&disk);
@@ -5516,11 +5506,7 @@ int main_networkattach(int argc, char **argv)
} else if (MATCH_OPTION("script", *argv, oparg)) {
replace_string(&nic.script, oparg);
} else if (MATCH_OPTION("backend", *argv, oparg)) {
- if(libxl_name_to_domid(ctx, oparg, &val)) {
- fprintf(stderr, "Specified backend domain does not exist,
defaulting to Dom0\n");
- val = 0;
- }
- nic.backend_domid = val;
+ replace_string(&nic.backend_domain.name, oparg);
} else if (MATCH_OPTION("vifname", *argv, oparg)) {
replace_string(&nic.ifname, oparg);
} else if (MATCH_OPTION("model", *argv, oparg)) {
@@ -5623,8 +5609,8 @@ int main_networkdetach(int argc, char **argv)
int main_blockattach(int argc, char **argv)
{
int opt;
- uint32_t fe_domid, be_domid = 0;
- libxl_device_disk disk = { 0 };
+ uint32_t fe_domid;
+ libxl_device_disk disk;
XLU_Config *config = 0;
if ((opt = def_getopt(argc, argv, "", "block-attach", 2)) != -1)
@@ -5639,8 +5625,6 @@ int main_blockattach(int argc, char **argv)
parse_disk_config_multistring
(&config, argc-optind, (const char* const*)argv + optind, &disk);
- disk.backend_domid = be_domid;
-
if (dryrun_only) {
char *json = libxl_device_disk_to_json(ctx, &disk);
printf("disk: %s\n", json);
@@ -5720,7 +5704,6 @@ int main_vtpmattach(int argc, char **argv)
int opt;
libxl_device_vtpm vtpm;
char *oparg;
- unsigned int val;
uint32_t domid;
if ((opt = def_getopt(argc, argv, "", "vtpm-attach", 1)) != -1)
@@ -5740,12 +5723,7 @@ int main_vtpmattach(int argc, char **argv)
return 1;
}
} else if (MATCH_OPTION("backend", *argv, oparg)) {
- if(domain_qualifier_to_domid(oparg, &val, 0)) {
- fprintf(stderr,
- "Specified backend domain does not exist, defaulting to
Dom0\n");
- val = 0;
- }
- vtpm.backend_domid = val;
+ replace_string(&vtpm.backend_domain.name, oparg);
} else {
fprintf(stderr, "unrecognized argument `%s'\n", *argv);
return 1;
diff --git a/tools/libxl/xl_sxp.c b/tools/libxl/xl_sxp.c
index a16a025..6cb8d40 100644
--- a/tools/libxl/xl_sxp.c
+++ b/tools/libxl/xl_sxp.c
@@ -163,7 +163,7 @@ void printf_info_sexp(int domid, libxl_domain_config
*d_config)
for (i = 0; i < d_config->num_disks; i++) {
printf("\t(device\n");
printf("\t\t(tap\n");
- printf("\t\t\t(backend_domid %d)\n", d_config->disks[i].backend_domid);
+ printf("\t\t\t(backend_domid %d)\n",
d_config->disks[i].backend_domain.domid);
printf("\t\t\t(frontend_domid %d)\n", domid);
printf("\t\t\t(physpath %s)\n", d_config->disks[i].pdev_path);
printf("\t\t\t(phystype %d)\n", d_config->disks[i].backend);
@@ -180,7 +180,7 @@ void printf_info_sexp(int domid, libxl_domain_config
*d_config)
printf("\t\t(vif\n");
if (d_config->nics[i].ifname)
printf("\t\t\t(vifname %s)\n", d_config->nics[i].ifname);
- printf("\t\t\t(backend_domid %d)\n", d_config->nics[i].backend_domid);
+ printf("\t\t\t(backend_domid %d)\n",
d_config->nics[i].backend_domain.domid);
printf("\t\t\t(frontend_domid %d)\n", domid);
printf("\t\t\t(devid %d)\n", d_config->nics[i].devid);
printf("\t\t\t(mtu %d)\n", d_config->nics[i].mtu);
@@ -210,7 +210,7 @@ void printf_info_sexp(int domid, libxl_domain_config
*d_config)
for (i = 0; i < d_config->num_vfbs; i++) {
printf("\t(device\n");
printf("\t\t(vfb\n");
- printf("\t\t\t(backend_domid %d)\n", d_config->vfbs[i].backend_domid);
+ printf("\t\t\t(backend_domid %d)\n",
d_config->vfbs[i].backend_domain.domid);
printf("\t\t\t(frontend_domid %d)\n", domid);
printf("\t\t\t(devid %d)\n", d_config->vfbs[i].devid);
printf("\t\t\t(vnc %s)\n",
--
1.7.11.7
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