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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 23/25] xl / libxl: support naming of assignable devices
From: Paul Durrant <pdurrant@xxxxxxxxxx>
This patch modifies libxl_device_pci_assignable_add() to take an optional
'name' argument, which (if supplied) is saved into xenstore and can hence be
used to refer to the now-assignable BDF in subsequent operations. To
facilitate this, a new libxl_device_pci_assignable_name2bdf() function is
added.
The xl code is modified to allow a name to be specified in the
'pci-assignable-add' operation and also allow an option to be specified to
'pci-assignable-list' requesting that names be displayed. The latter is
facilitated by a new libxl_device_pci_assignable_bdf2name() function. Finally
xl 'pci-assignable-remove' is modified to that either a name or BDF can be
supplied. The supplied 'identifier' is first assumed to be a name, but if
libxl_device_pci_assignable_name2bdf() fails to find a matching BDF the
identifier itself will be parsed as a BDF. Names my only include printable
characters and may not include whitespace.
Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
Cc: Christian Lindig <christian.lindig@xxxxxxxxxx>
Cc: David Scott <dave@xxxxxxxxxx>
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
tools/include/libxl.h | 19 +++++++-
tools/libs/light/libxl_pci.c | 86 +++++++++++++++++++++++++++++++++---
tools/ocaml/libs/xl/xenlight_stubs.c | 3 +-
tools/xl/xl_cmdtable.c | 12 +++--
tools/xl/xl_pci.c | 84 ++++++++++++++++++++++++-----------
5 files changed, 166 insertions(+), 38 deletions(-)
diff --git a/tools/include/libxl.h b/tools/include/libxl.h
index 5703fdf367..4025d3a3d4 100644
--- a/tools/include/libxl.h
+++ b/tools/include/libxl.h
@@ -477,6 +477,14 @@
#define LIBXL_HAVE_PCI_ASSIGNABLE_BDF 1
/*
+ * LIBXL_HAVE_PCI_ASSIGNABLE_NAME indicates that the
+ * libxl_device_pci_assignable_add() function takes a 'name' argument
+ * and that the libxl_device_pci_assignable_name2bdf() and
+ * libxl_device_pci_assignable_bdf2name() functions are defined.
+ */
+#define LIBXL_HAVE_PCI_ASSIGNABLE_NAME 1
+
+/*
* libxl ABI compatibility
*
* The only guarantee which libxl makes regarding ABI compatibility
@@ -2385,11 +2393,18 @@ int libxl_device_events_handler(libxl_ctx *ctx,
* added or is not bound, the functions will emit a warning but return
* SUCCESS.
*/
-int libxl_device_pci_assignable_add(libxl_ctx *ctx, libxl_pci_bdf *pcibdf, int
rebind);
-int libxl_device_pci_assignable_remove(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
int rebind);
+int libxl_device_pci_assignable_add(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
+ const char *name, int rebind);
+int libxl_device_pci_assignable_remove(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
+ int rebind);
libxl_pci_bdf *libxl_device_pci_assignable_list(libxl_ctx *ctx, int *num);
void libxl_device_pci_assignable_list_free(libxl_pci_bdf *list, int num);
+libxl_pci_bdf *libxl_device_pci_assignable_name2bdf(libxl_ctx *ctx,
+ const char *name);
+char *libxl_device_pci_assignable_bdf2name(libxl_ctx *ctx,
+ libxl_pci_bdf *pcibdf);
+
/* CPUID handling */
int libxl_cpuid_parse_config(libxl_cpuid_policy_list *cpuid, const char* str);
int libxl_cpuid_parse_config_xend(libxl_cpuid_policy_list *cpuid,
diff --git a/tools/libs/light/libxl_pci.c b/tools/libs/light/libxl_pci.c
index 5104f31448..0f7d655aff 100644
--- a/tools/libs/light/libxl_pci.c
+++ b/tools/libs/light/libxl_pci.c
@@ -713,6 +713,7 @@ static int pciback_dev_unassign(libxl__gc *gc,
libxl_pci_bdf *pcibdf)
static int libxl__device_pci_assignable_add(libxl__gc *gc,
libxl_pci_bdf *pcibdf,
+ const char *name,
int rebind)
{
libxl_ctx *ctx = libxl__gc_owner(gc);
@@ -721,6 +722,23 @@ static int libxl__device_pci_assignable_add(libxl__gc *gc,
int rc;
struct stat st;
+ /* Sanitise any name that was passed */
+ if (name) {
+ unsigned int i, n = strlen(name);
+
+ if (n > 64) { /* Reasonable upper bound on name length */
+ LOG(ERROR, "Name too long");
+ return ERROR_FAIL;
+ }
+
+ for (i = 0; i < n; i++) {
+ if (!isgraph(name[i])) {
+ LOG(ERROR, "Names may only include printable characters");
+ return ERROR_FAIL;
+ }
+ }
+ }
+
/* Local copy for convenience */
dom = pcibdf->domain;
bus = pcibdf->bus;
@@ -741,7 +759,7 @@ static int libxl__device_pci_assignable_add(libxl__gc *gc,
}
if ( rc ) {
LOG(WARN, PCI_BDF" already assigned to pciback", dom, bus, dev, func);
- goto quarantine;
+ goto name;
}
/* Check to see if there's already a driver that we need to unbind from */
@@ -772,7 +790,12 @@ static int libxl__device_pci_assignable_add(libxl__gc *gc,
return ERROR_FAIL;
}
-quarantine:
+name:
+ if (name)
+ pci_info_xs_write(gc, pcibdf, "name", name);
+ else
+ pci_info_xs_remove(gc, pcibdf, "name");
+
/*
* DOMID_IO is just a sentinel domain, without any actual mappings,
* so always pass XEN_DOMCTL_DEV_RDM_RELAXED to avoid assignment being
@@ -836,16 +859,18 @@ static int libxl__device_pci_assignable_remove(libxl__gc
*gc,
}
}
+ pci_info_xs_remove(gc, pcibdf, "name");
+
return 0;
}
int libxl_device_pci_assignable_add(libxl_ctx *ctx, libxl_pci_bdf *pcibdf,
- int rebind)
+ const char *name, int rebind)
{
GC_INIT(ctx);
int rc;
- rc = libxl__device_pci_assignable_add(gc, pcibdf, rebind);
+ rc = libxl__device_pci_assignable_add(gc, pcibdf, name, rebind);
GC_FREE;
return rc;
@@ -864,6 +889,57 @@ int libxl_device_pci_assignable_remove(libxl_ctx *ctx,
libxl_pci_bdf *pcibdf,
return rc;
}
+libxl_pci_bdf *libxl_device_pci_assignable_name2bdf(libxl_ctx *ctx,
+ const char *name)
+{
+ GC_INIT(ctx);
+ char **bdfs;
+ libxl_pci_bdf *pcibdf;
+ unsigned int i, n;
+
+ bdfs = libxl__xs_directory(gc, XBT_NULL, PCI_INFO_PATH, &n);
+ if (!n)
+ goto out;
+
+ pcibdf = calloc(1, sizeof(*pcibdf));
+ if (!pcibdf)
+ goto out;
+
+ for (i = 0; i < n; i++) {
+ unsigned dom, bus, dev, func;
+ const char *tmp;
+
+ if (sscanf(bdfs[i], PCI_BDF_XSPATH, &dom, &bus, &dev, &func) != 4)
+ continue;
+
+ pcibdf_struct_fill(pcibdf, dom, bus, dev, func);
+
+ tmp = pci_info_xs_read(gc, pcibdf, "name");
+ if (tmp && !strcmp(tmp, name))
+ goto out;
+ }
+
+ free(pcibdf);
+ pcibdf = NULL;
+
+out:
+ GC_FREE;
+ return pcibdf;
+}
+
+char *libxl_device_pci_assignable_bdf2name(libxl_ctx *ctx,
+ libxl_pci_bdf *pcibdf)
+{
+ GC_INIT(ctx);
+ char *name = NULL, *tmp = pci_info_xs_read(gc, pcibdf, "name");
+
+ if (tmp)
+ name = strdup(tmp);
+
+ GC_FREE;
+ return name;
+}
+
/*
* This function checks that all functions of a device are bound to pciback
* driver. It also initialises a bit-mask of which function numbers are present
@@ -1527,7 +1603,7 @@ void libxl__device_pci_add(libxl__egc *egc, uint32_t
domid,
if (rc) goto out;
if (pci->seize && !pciback_dev_is_assigned(gc, &pci->bdf)) {
- rc = libxl__device_pci_assignable_add(gc, &pci->bdf, 1);
+ rc = libxl__device_pci_assignable_add(gc, &pci->bdf, NULL, 1);
if ( rc )
goto out;
}
diff --git a/tools/ocaml/libs/xl/xenlight_stubs.c
b/tools/ocaml/libs/xl/xenlight_stubs.c
index 2388f23869..96bb4655e0 100644
--- a/tools/ocaml/libs/xl/xenlight_stubs.c
+++ b/tools/ocaml/libs/xl/xenlight_stubs.c
@@ -840,7 +840,8 @@ value stub_xl_device_pci_assignable_add(value ctx, value
info, value rebind)
device_pci_val(CTX, &c_info, info);
caml_enter_blocking_section();
- ret = libxl_device_pci_assignable_add(CTX, &c_info.bdf, c_rebind);
+ ret = libxl_device_pci_assignable_add(CTX, &c_info.bdf, NULL,
+ c_rebind);
caml_leave_blocking_section();
libxl_device_pci_dispose(&c_info);
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index 2ee0c49673..9e9aa448e2 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -105,21 +105,25 @@ struct cmd_spec cmd_table[] = {
{ "pci-assignable-add",
&main_pciassignable_add, 0, 1,
"Make a device assignable for pci-passthru",
- "<BDF>",
+ "[options] <BDF>",
+ "-n NAME, --name=NAME Name the assignable device.\n"
"-h Print this help.\n"
},
{ "pci-assignable-remove",
&main_pciassignable_remove, 0, 1,
"Remove a device from being assignable",
- "[options] <BDF>",
+ "[options] <BDF>|NAME",
"-h Print this help.\n"
"-r Attempt to re-assign the device to the\n"
- " original driver"
+ " original driver."
},
{ "pci-assignable-list",
&main_pciassignable_list, 0, 0,
"List all the assignable pci devices",
- "",
+ "[options]",
+ "-h Print this help.\n"
+ "-n, --show-names Display assignable device names where\n"
+ " supplied.\n"
},
{ "pause",
&main_pause, 0, 1,
diff --git a/tools/xl/xl_pci.c b/tools/xl/xl_pci.c
index 37708b4eb1..f1b58b3976 100644
--- a/tools/xl/xl_pci.c
+++ b/tools/xl/xl_pci.c
@@ -152,7 +152,7 @@ int main_pciattach(int argc, char **argv)
return EXIT_SUCCESS;
}
-static void pciassignable_list(void)
+static void pciassignable_list(bool show_names)
{
libxl_pci_bdf *pcibdfs;
int num, i;
@@ -162,9 +162,15 @@ static void pciassignable_list(void)
if ( pcibdfs == NULL )
return;
for (i = 0; i < num; i++) {
- printf("%04x:%02x:%02x.%01x\n",
- pcibdfs[i].domain, pcibdfs[i].bus, pcibdfs[i].dev,
- pcibdfs[i].func);
+ libxl_pci_bdf *pcibdf = &pcibdfs[i];
+ char *name = show_names ?
+ libxl_device_pci_assignable_bdf2name(ctx, pcibdf) : NULL;
+
+ printf("%04x:%02x:%02x.%01x %s\n",
+ pcibdf->domain, pcibdf->bus, pcibdf->dev, pcibdf->func,
+ name ?: "");
+
+ free(name);
}
libxl_device_pci_assignable_list_free(pcibdfs, num);
}
@@ -172,16 +178,23 @@ static void pciassignable_list(void)
int main_pciassignable_list(int argc, char **argv)
{
int opt;
-
- SWITCH_FOREACH_OPT(opt, "", NULL, "pci-assignable-list", 0) {
- /* No options */
+ static struct option opts[] = {
+ {"show-names", 0, 0, 'n'},
+ COMMON_LONG_OPTS
+ };
+ bool show_names = false;
+
+ SWITCH_FOREACH_OPT(opt, "n", opts, "pci-assignable-list", 0) {
+ case 'n':
+ show_names = true;
+ break;
}
- pciassignable_list();
+ pciassignable_list(show_names);
return 0;
}
-static int pciassignable_add(const char *bdf, int rebind)
+static int pciassignable_add(const char *bdf, const char *name, int rebind)
{
libxl_pci_bdf pcibdf;
XLU_Config *config;
@@ -197,7 +210,7 @@ static int pciassignable_add(const char *bdf, int rebind)
exit(2);
}
- if (libxl_device_pci_assignable_add(ctx, &pcibdf, rebind))
+ if (libxl_device_pci_assignable_add(ctx, &pcibdf, name, rebind))
r = 1;
libxl_pci_bdf_dispose(&pcibdf);
@@ -210,39 +223,58 @@ int main_pciassignable_add(int argc, char **argv)
{
int opt;
const char *bdf = NULL;
-
- SWITCH_FOREACH_OPT(opt, "", NULL, "pci-assignable-add", 1) {
- /* No options */
+ static struct option opts[] = {
+ {"name", 1, 0, 'n'},
+ COMMON_LONG_OPTS
+ };
+ const char *name = NULL;
+
+ SWITCH_FOREACH_OPT(opt, "n:", opts, "pci-assignable-add", 0) {
+ case 'n':
+ name = optarg;
+ break;
}
bdf = argv[optind];
- if (pciassignable_add(bdf, 1))
+ if (pciassignable_add(bdf, name, 1))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
-static int pciassignable_remove(const char *bdf, int rebind)
+static int pciassignable_remove(const char *ident, int rebind)
{
- libxl_pci_bdf pcibdf;
+ libxl_pci_bdf *pcibdf;
XLU_Config *config;
int r = 0;
- libxl_pci_bdf_init(&pcibdf);
-
config = xlu_cfg_init(stderr, "command line");
if (!config) { perror("xlu_cfg_init"); exit(-1); }
- if (xlu_pci_parse_bdf(config, &pcibdf, bdf)) {
- fprintf(stderr, "pci-assignable-remove: malformed BDF \"%s\"\n", bdf);
- exit(2);
+ pcibdf = libxl_device_pci_assignable_name2bdf(ctx, ident);
+ if (!pcibdf) {
+ pcibdf = calloc(1, sizeof(*pcibdf));
+
+ if (!pcibdf) {
+ fprintf(stderr,
+ "pci-assignable-remove: failed to allocate memory\n");
+ exit(2);
+ }
+
+ libxl_pci_bdf_init(pcibdf);
+ if (xlu_pci_parse_bdf(config, pcibdf, ident)) {
+ fprintf(stderr,
+ "pci-assignable-remove: malformed BDF '%s'\n", ident);
+ exit(2);
+ }
}
- if (libxl_device_pci_assignable_remove(ctx, &pcibdf, rebind))
+ if (libxl_device_pci_assignable_remove(ctx, pcibdf, rebind))
r = 1;
- libxl_pci_bdf_dispose(&pcibdf);
+ libxl_pci_bdf_dispose(pcibdf);
+ free(pcibdf);
xlu_cfg_destroy(config);
return r;
@@ -251,7 +283,7 @@ static int pciassignable_remove(const char *bdf, int rebind)
int main_pciassignable_remove(int argc, char **argv)
{
int opt;
- const char *bdf = NULL;
+ const char *ident = NULL;
int rebind = 0;
SWITCH_FOREACH_OPT(opt, "r", NULL, "pci-assignable-remove", 1) {
@@ -260,9 +292,9 @@ int main_pciassignable_remove(int argc, char **argv)
break;
}
- bdf = argv[optind];
+ ident = argv[optind];
- if (pciassignable_remove(bdf, rebind))
+ if (pciassignable_remove(ident, rebind))
return EXIT_FAILURE;
return EXIT_SUCCESS;
--
2.11.0
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