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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v7 2/7] libxlu: introduce xlu_pci_parse_spec_string()
From: Paul Durrant <pdurrant@xxxxxxxxxx>
This patch largely re-writes the code to parse a PCI_SPEC_STRING and enters
it via the newly introduced function. The new parser also deals with 'bdf'
and 'vslot' as non-positional paramaters, as per the documentation in
xl-pci-configuration(5).
The existing xlu_pci_parse_bdf() function remains, but now strictly parses
BDF values. Some existing callers of xlu_pci_parse_bdf() are
modified to call xlu_pci_parse_spec_string() as per the documentation in xl(1).
NOTE: Usage text in xl_cmdtable.c and error messages are also modified
appropriately.
As a side-effect this patch also fixes a bug where using '*' to specify
all functions would lead to an assertion failure at the end of
xlu_pci_parse_bdf().
Fixes: d25cc3ec93eb ("libxl: workaround gcc 10.2 maybe-uninitialized warning")
Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
Acked-by: Wei Liu <wl@xxxxxxx>
---
Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>
v7:
- Minor modifications now that the 'libxl_pci_bdf' type no longer exists
- Modifications are largely mechanical so Wei's A-b is retained
---
tools/include/libxlutil.h | 8 +-
tools/libs/util/libxlu_pci.c | 348 +++++++++++++++++++++++--------------------
tools/xl/xl_cmdtable.c | 4 +-
tools/xl/xl_parse.c | 4 +-
tools/xl/xl_pci.c | 33 ++--
5 files changed, 213 insertions(+), 184 deletions(-)
diff --git a/tools/include/libxlutil.h b/tools/include/libxlutil.h
index 92e35c5462..4dd3c5e92b 100644
--- a/tools/include/libxlutil.h
+++ b/tools/include/libxlutil.h
@@ -109,9 +109,15 @@ int xlu_disk_parse(XLU_Config *cfg, int nspecs, const char
*const *specs,
*/
/*
+ * PCI BDF
+ */
+int xlu_pci_parse_bdf(XLU_Config *cfg, libxl_device_pci *pci, const char *str);
+
+/*
* PCI specification parsing
*/
-int xlu_pci_parse_bdf(XLU_Config *cfg, libxl_device_pci *pcidev, const char
*str);
+int xlu_pci_parse_spec_string(XLU_Config *cfg, libxl_device_pci *pci,
+ const char *str);
/*
* RDM parsing
diff --git a/tools/libs/util/libxlu_pci.c b/tools/libs/util/libxlu_pci.c
index 1d38fffce3..05472a0bd1 100644
--- a/tools/libs/util/libxlu_pci.c
+++ b/tools/libs/util/libxlu_pci.c
@@ -1,5 +1,7 @@
#define _GNU_SOURCE
+#include <ctype.h>
+
#include "libxlu_internal.h"
#include "libxlu_disk_l.h"
#include "libxlu_disk_i.h"
@@ -9,185 +11,209 @@
#define XLU__PCI_ERR(_c, _x, _a...) \
if((_c) && (_c)->report) fprintf((_c)->report, _x, ##_a)
-static int hex_convert(const char *str, unsigned int *val, unsigned int mask)
+static int parse_bdf(libxl_device_pci *pci, const char *str, const char **endp)
{
- unsigned long ret;
- char *end;
-
- ret = strtoul(str, &end, 16);
- if ( end == str || *end != '\0' )
- return -1;
- if ( ret & ~mask )
- return -1;
- *val = (unsigned int)ret & mask;
- return 0;
-}
+ const char *ptr = str;
+ unsigned int colons = 0;
+ unsigned int domain, bus, dev, func;
+ int n;
+
+ /* Count occurrences of ':' to detrmine presence/absence of the 'domain' */
+ while (isxdigit(*ptr) || *ptr == ':') {
+ if (*ptr == ':')
+ colons++;
+ ptr++;
+ }
+
+ ptr = str;
+ switch (colons) {
+ case 1:
+ domain = 0;
+ if (sscanf(ptr, "%x:%x.%n", &bus, &dev, &n) != 2)
+ return ERROR_INVAL;
+ break;
+ case 2:
+ if (sscanf(ptr, "%x:%x:%x.%n", &domain, &bus, &dev, &n) != 3)
+ return ERROR_INVAL;
+ break;
+ default:
+ return ERROR_INVAL;
+ }
+
+ if (domain > 0xffff || bus > 0xff || dev > 0x1f)
+ return ERROR_INVAL;
+
+ ptr += n;
+ if (*ptr == '*') {
+ pci->vfunc_mask = LIBXL_PCI_FUNC_ALL;
+ func = 0;
+ ptr++;
+ } else {
+ if (sscanf(ptr, "%x%n", &func, &n) != 1)
+ return ERROR_INVAL;
+ if (func > 7)
+ return ERROR_INVAL;
+ pci->vfunc_mask = 1;
+ ptr += n;
+ }
-static int pci_struct_fill(libxl_device_pci *pci, unsigned int domain,
- unsigned int bus, unsigned int dev,
- unsigned int func, unsigned int vdevfn)
-{
pci->domain = domain;
pci->bus = bus;
pci->dev = dev;
pci->func = func;
- pci->vdevfn = vdevfn;
+
+ if (endp)
+ *endp = ptr;
+
return 0;
}
-#define STATE_DOMAIN 0
-#define STATE_BUS 1
-#define STATE_DEV 2
-#define STATE_FUNC 3
-#define STATE_VSLOT 4
-#define STATE_OPTIONS_K 6
-#define STATE_OPTIONS_V 7
-#define STATE_TERMINAL 8
-#define STATE_TYPE 9
-#define STATE_RDM_STRATEGY 10
-#define STATE_RESERVE_POLICY 11
-#define INVALID 0xffffffff
-int xlu_pci_parse_bdf(XLU_Config *cfg, libxl_device_pci *pci, const char *str)
+static int parse_vslot(uint32_t *vdevfnp, const char *str, const char **endp)
{
- unsigned state = STATE_DOMAIN;
- unsigned dom = INVALID, bus = INVALID, dev = INVALID, func = INVALID,
vslot = 0;
- char *buf2, *tok, *ptr, *end, *optkey = NULL;
+ const char *ptr = str;
+ unsigned int val;
+ int n;
+
+ if (sscanf(ptr, "%x%n", &val, &n) != 1)
+ return ERROR_INVAL;
+
+ if (val > 0x1f)
+ return ERROR_INVAL;
+
+ ptr += n;
+
+ *vdevfnp = val << 3;
+
+ if (endp)
+ *endp = ptr;
+
+ return 0;
+}
+
+static int parse_key_val(char **keyp, char**valp, const char *str,
+ const char **endp)
+{
+ const char *ptr = str;
+ char *key, *val;
+
+ while (*ptr != '=' && *ptr != '\0')
+ ptr++;
+
+ if (*ptr == '\0')
+ return ERROR_INVAL;
- if ( NULL == (buf2 = ptr = strdup(str)) )
+ key = strndup(str, ptr - str);
+ if (!key)
return ERROR_NOMEM;
- for(tok = ptr, end = ptr + strlen(ptr) + 1; ptr < end; ptr++) {
- switch(state) {
- case STATE_DOMAIN:
- if ( *ptr == ':' ) {
- state = STATE_BUS;
- *ptr = '\0';
- if ( hex_convert(tok, &dom, 0xffff) )
- goto parse_error;
- tok = ptr + 1;
- }
- break;
- case STATE_BUS:
- if ( *ptr == ':' ) {
- state = STATE_DEV;
- *ptr = '\0';
- if ( hex_convert(tok, &bus, 0xff) )
- goto parse_error;
- tok = ptr + 1;
- }else if ( *ptr == '.' ) {
- state = STATE_FUNC;
- *ptr = '\0';
- if ( dom & ~0xff )
- goto parse_error;
- bus = dom;
- dom = 0;
- if ( hex_convert(tok, &dev, 0xff) )
- goto parse_error;
- tok = ptr + 1;
- }
- break;
- case STATE_DEV:
- if ( *ptr == '.' ) {
- state = STATE_FUNC;
- *ptr = '\0';
- if ( hex_convert(tok, &dev, 0xff) )
- goto parse_error;
- tok = ptr + 1;
- }
- break;
- case STATE_FUNC:
- if ( *ptr == '\0' || *ptr == '@' || *ptr == ',' ) {
- switch( *ptr ) {
- case '\0':
- state = STATE_TERMINAL;
- break;
- case '@':
- state = STATE_VSLOT;
- break;
- case ',':
- state = STATE_OPTIONS_K;
- break;
- }
- *ptr = '\0';
- if ( !strcmp(tok, "*") ) {
- pci->vfunc_mask = LIBXL_PCI_FUNC_ALL;
- }else{
- if ( hex_convert(tok, &func, 0x7) )
- goto parse_error;
- pci->vfunc_mask = (1 << 0);
- }
- tok = ptr + 1;
- }
- break;
- case STATE_VSLOT:
- if ( *ptr == '\0' || *ptr == ',' ) {
- state = ( *ptr == ',' ) ? STATE_OPTIONS_K : STATE_TERMINAL;
- *ptr = '\0';
- if ( hex_convert(tok, &vslot, 0xff) )
- goto parse_error;
- tok = ptr + 1;
- }
- break;
- case STATE_OPTIONS_K:
- if ( *ptr == '=' ) {
- state = STATE_OPTIONS_V;
- *ptr = '\0';
- optkey = tok;
- tok = ptr + 1;
- }
- break;
- case STATE_OPTIONS_V:
- if ( *ptr == ',' || *ptr == '\0' ) {
- state = (*ptr == ',') ? STATE_OPTIONS_K : STATE_TERMINAL;
- *ptr = '\0';
- if ( !strcmp(optkey, "msitranslate") ) {
- pci->msitranslate = atoi(tok);
- }else if ( !strcmp(optkey, "power_mgmt") ) {
- pci->power_mgmt = atoi(tok);
- }else if ( !strcmp(optkey, "permissive") ) {
- pci->permissive = atoi(tok);
- }else if ( !strcmp(optkey, "seize") ) {
- pci->seize = atoi(tok);
- } else if (!strcmp(optkey, "rdm_policy")) {
- if (!strcmp(tok, "strict")) {
- pci->rdm_policy = LIBXL_RDM_RESERVE_POLICY_STRICT;
- } else if (!strcmp(tok, "relaxed")) {
- pci->rdm_policy = LIBXL_RDM_RESERVE_POLICY_RELAXED;
- } else {
- XLU__PCI_ERR(cfg, "%s is not an valid PCI RDM property"
- " policy: 'strict' or 'relaxed'.",
- tok);
- goto parse_error;
- }
- } else {
- XLU__PCI_ERR(cfg, "Unknown PCI BDF option: %s", optkey);
- }
- tok = ptr + 1;
- }
- default:
- break;
+ str = ++ptr; /* skip '=' */
+ while (*ptr != ',' && *ptr != '\0')
+ ptr++;
+
+ val = strndup(str, ptr - str);
+ if (!val) {
+ free(key);
+ return ERROR_NOMEM;
+ }
+
+ if (*ptr == ',')
+ ptr++;
+
+ *keyp = key;
+ *valp = val;
+ *endp = ptr;
+
+ return 0;
+}
+
+static int parse_rdm_policy(XLU_Config *cfg, libxl_rdm_reserve_policy *policy,
+ const char *str)
+{
+ int ret = libxl_rdm_reserve_policy_from_string(str, policy);
+
+ if (ret)
+ XLU__PCI_ERR(cfg, "Unknown RDM policy: %s", str);
+
+ return ret;
+}
+
+int xlu_pci_parse_bdf(XLU_Config *cfg, libxl_device_pci *pci, const char *str)
+{
+ return parse_bdf(pci, str, NULL);
+}
+
+int xlu_pci_parse_spec_string(XLU_Config *cfg, libxl_device_pci *pci,
+ const char *str)
+{
+ const char *ptr = str;
+ bool bdf_present = false;
+ int ret;
+
+ /* Attempt to parse 'bdf' as positional parameter */
+ ret = parse_bdf(pci, ptr, &ptr);
+ if (!ret) {
+ bdf_present = true;
+
+ /* Check whether 'vslot' if present */
+ if (*ptr == '@') {
+ ret = parse_vslot(&pci->vdevfn, ++ptr, &ptr);
+ if (ret)
+ return ret;
}
+ if (*ptr == ',')
+ ptr++;
+ else if (*ptr != '\0')
+ return ERROR_INVAL;
}
- if ( tok != ptr || state != STATE_TERMINAL )
- goto parse_error;
+ /* Parse the rest as 'key=val' pairs */
+ while (*ptr != '\0') {
+ char *key, *val;
- assert(dom != INVALID && bus != INVALID && dev != INVALID && func !=
INVALID);
+ ret = parse_key_val(&key, &val, ptr, &ptr);
+ if (ret)
+ return ret;
- /* Just a pretty way to fill in the values */
- pci_struct_fill(pci, dom, bus, dev, func, vslot << 3);
+ if (!strcmp(key, "bdf")) {
+ ret = parse_bdf(pci, val, NULL);
+ if (!ret) bdf_present = true;
+ } else if (!strcmp(key, "vslot")) {
+ ret = parse_vslot(&pci->vdevfn, val, NULL);
+ } else if (!strcmp(key, "permissive")) {
+ pci->permissive = atoi(val);
+ } else if (!strcmp(key, "msitranslate")) {
+ pci->msitranslate = atoi(val);
+ } else if (!strcmp(key, "seize")) {
+ pci->seize= atoi(val);
+ } else if (!strcmp(key, "power_mgmt")) {
+ pci->power_mgmt = atoi(val);
+ } else if (!strcmp(key, "rdm_policy")) {
+ ret = parse_rdm_policy(cfg, &pci->rdm_policy, val);
+ } else {
+ XLU__PCI_ERR(cfg, "Unknown PCI_SPEC_STRING option: %s", key);
+ ret = ERROR_INVAL;
+ }
- free(buf2);
+ free(key);
+ free(val);
- return 0;
+ if (ret)
+ return ret;
+ }
-parse_error:
- free(buf2);
- return ERROR_INVAL;
+ if (!bdf_present)
+ return ERROR_INVAL;
+
+ return 0;
}
int xlu_rdm_parse(XLU_Config *cfg, libxl_rdm_reserve *rdm, const char *str)
{
+#define STATE_TYPE 0
+#define STATE_RDM_STRATEGY 1
+#define STATE_RESERVE_POLICY 2
+#define STATE_TERMINAL 3
+
unsigned state = STATE_TYPE;
char *buf2, *tok, *ptr, *end;
@@ -227,15 +253,8 @@ int xlu_rdm_parse(XLU_Config *cfg, libxl_rdm_reserve *rdm,
const char *str)
if (*ptr == ',' || *ptr == '\0') {
state = *ptr == ',' ? STATE_TYPE : STATE_TERMINAL;
*ptr = '\0';
- if (!strcmp(tok, "strict")) {
- rdm->policy = LIBXL_RDM_RESERVE_POLICY_STRICT;
- } else if (!strcmp(tok, "relaxed")) {
- rdm->policy = LIBXL_RDM_RESERVE_POLICY_RELAXED;
- } else {
- XLU__PCI_ERR(cfg, "Unknown RDM property policy value: %s",
- tok);
+ if (!parse_rdm_policy(cfg, &rdm->policy, tok))
goto parse_error;
- }
tok = ptr + 1;
}
default:
@@ -253,6 +272,11 @@ int xlu_rdm_parse(XLU_Config *cfg, libxl_rdm_reserve *rdm,
const char *str)
parse_error:
free(buf2);
return ERROR_INVAL;
+
+#undef STATE_TYPE
+#undef STATE_RDM_STRATEGY
+#undef STATE_RESERVE_POLICY
+#undef STATE_TERMINAL
}
/*
diff --git a/tools/xl/xl_cmdtable.c b/tools/xl/xl_cmdtable.c
index 6ab5e47da3..30e17a2848 100644
--- a/tools/xl/xl_cmdtable.c
+++ b/tools/xl/xl_cmdtable.c
@@ -90,12 +90,12 @@ struct cmd_spec cmd_table[] = {
{ "pci-attach",
&main_pciattach, 0, 1,
"Insert a new pass-through pci device",
- "<Domain> <BDF> [Virtual Slot]",
+ "<Domain> <PCI_SPEC_STRING>",
},
{ "pci-detach",
&main_pcidetach, 0, 1,
"Remove a domain's pass-through pci device",
- "<Domain> <BDF>",
+ "<Domain> <PCI_SPEC_STRING>",
},
{ "pci-list",
&main_pcilist, 0, 0,
diff --git a/tools/xl/xl_parse.c b/tools/xl/xl_parse.c
index 4ebf39620a..867e4d068a 100644
--- a/tools/xl/xl_parse.c
+++ b/tools/xl/xl_parse.c
@@ -1487,10 +1487,10 @@ void parse_config_data(const char *config_source,
* the global policy by default.
*/
pci->rdm_policy = b_info->u.hvm.rdm.policy;
- e = xlu_pci_parse_bdf(config, pci, buf);
+ e = xlu_pci_parse_spec_string(config, pci, buf);
if (e) {
fprintf(stderr,
- "unable to parse PCI BDF `%s' for passthrough\n",
+ "unable to parse PCI_SPEC_STRING `%s' for
passthrough\n",
buf);
exit(-e);
}
diff --git a/tools/xl/xl_pci.c b/tools/xl/xl_pci.c
index f71498cbb5..9a66494bb5 100644
--- a/tools/xl/xl_pci.c
+++ b/tools/xl/xl_pci.c
@@ -54,7 +54,7 @@ int main_pcilist(int argc, char **argv)
return 0;
}
-static int pcidetach(uint32_t domid, const char *bdf, int force)
+static int pcidetach(uint32_t domid, const char *spec_string, int force)
{
libxl_device_pci pci;
XLU_Config *config;
@@ -65,8 +65,9 @@ static int pcidetach(uint32_t domid, const char *bdf, int
force)
config = xlu_cfg_init(stderr, "command line");
if (!config) { perror("xlu_cfg_inig"); exit(-1); }
- if (xlu_pci_parse_bdf(config, &pci, bdf)) {
- fprintf(stderr, "pci-detach: malformed BDF specification \"%s\"\n",
bdf);
+ if (xlu_pci_parse_spec_string(config, &pci, spec_string)) {
+ fprintf(stderr, "pci-detach: malformed PCI_SPEC_STRING \"%s\"\n",
+ spec_string);
exit(2);
}
if (force) {
@@ -88,7 +89,7 @@ int main_pcidetach(int argc, char **argv)
uint32_t domid;
int opt;
int force = 0;
- const char *bdf = NULL;
+ const char *spec_string = NULL;
SWITCH_FOREACH_OPT(opt, "f", NULL, "pci-detach", 2) {
case 'f':
@@ -97,15 +98,15 @@ int main_pcidetach(int argc, char **argv)
}
domid = find_domain(argv[optind]);
- bdf = argv[optind + 1];
+ spec_string = argv[optind + 1];
- if (pcidetach(domid, bdf, force))
+ if (pcidetach(domid, spec_string, force))
return EXIT_FAILURE;
return EXIT_SUCCESS;
}
-static int pciattach(uint32_t domid, const char *bdf, const char *vs)
+static int pciattach(uint32_t domid, const char *spec_string)
{
libxl_device_pci pci;
XLU_Config *config;
@@ -116,8 +117,9 @@ static int pciattach(uint32_t domid, const char *bdf, const
char *vs)
config = xlu_cfg_init(stderr, "command line");
if (!config) { perror("xlu_cfg_inig"); exit(-1); }
- if (xlu_pci_parse_bdf(config, &pci, bdf)) {
- fprintf(stderr, "pci-attach: malformed BDF specification \"%s\"\n",
bdf);
+ if (xlu_pci_parse_spec_string(config, &pci, spec_string)) {
+ fprintf(stderr, "pci-attach: malformed PCI_SPEC_STRING \"%s\"\n",
+ spec_string);
exit(2);
}
@@ -134,19 +136,16 @@ int main_pciattach(int argc, char **argv)
{
uint32_t domid;
int opt;
- const char *bdf = NULL, *vs = NULL;
+ const char *spec_string = NULL;
SWITCH_FOREACH_OPT(opt, "", NULL, "pci-attach", 2) {
/* No options */
}
domid = find_domain(argv[optind]);
- bdf = argv[optind + 1];
-
- if (optind + 1 < argc)
- vs = argv[optind + 2];
+ spec_string = argv[optind + 1];
- if (pciattach(domid, bdf, vs))
+ if (pciattach(domid, spec_string))
return EXIT_FAILURE;
return EXIT_SUCCESS;
@@ -192,7 +191,7 @@ static int pciassignable_add(const char *bdf, int rebind)
if (!config) { perror("xlu_cfg_init"); exit(-1); }
if (xlu_pci_parse_bdf(config, &pci, bdf)) {
- fprintf(stderr, "pci-assignable-add: malformed BDF specification
\"%s\"\n", bdf);
+ fprintf(stderr, "pci-assignable-add: malformed BDF \"%s\"\n", bdf);
exit(2);
}
@@ -234,7 +233,7 @@ static int pciassignable_remove(const char *bdf, int rebind)
if (!config) { perror("xlu_cfg_init"); exit(-1); }
if (xlu_pci_parse_bdf(config, &pci, bdf)) {
- fprintf(stderr, "pci-assignable-remove: malformed BDF specification
\"%s\"\n", bdf);
+ fprintf(stderr, "pci-assignable-remove: malformed BDF \"%s\"\n", bdf);
exit(2);
}
--
2.11.0
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