[libvirt] [PATCH 2/2] Allow x86 to fetch sysinfo from /proc/cpuinfo when dmidecode is absent.
From: Prerna Saxena <prerna(a)linux.vnet.ibm.com>
Date: Thu, 16 Feb 2012 15:33:43 +0530
Subject: [PATCH 2/2] Sysinfo : Allow x86 to fetch sysinfo from
/proc/cpuinfo in the event 'dmidecode' is absent in the
system.
Based on Eric's suggestion
(http://www.redhat.com/archives/libvir-list/2012-February/msg00509.html)
--- src/util/sysinfo.c | 95
+++++++++++++++++++++++++++++++++++++++++++++++++-- 1 files changed, 91
insertions(+), 4 deletions(-)
diff --git a/src/util/sysinfo.c b/src/util/sysinfo.c
index 0161b22..5ca725e 100644
--- a/src/util/sysinfo.c
+++ b/src/util/sysinfo.c
@@ -596,6 +596,96 @@ no_memory:
return -1;
}
+/* If a call to 'dmidecode' fails,
+ * extract basic sysinfo from /proc/cpuinfo */
+
+static int
+virSysinfoParseCPUInfoProcessor(const char *base, virSysinfoDefPtr ret)
+{
+ char *cur, *eol, *tmp_base;
+ virSysinfoProcessorDefPtr processor;
+
+ while((tmp_base = strstr(base, "processor")) != NULL) {
+ base = tmp_base;
+ eol = strchr(base, '\n');
+ cur = strchr(base, ':') + 1;
+
+ if (VIR_EXPAND_N(ret->processor, ret->nprocessor, 1) < 0) {
+ goto no_memory;
+ }
+
+ processor = &ret->processor[ret->nprocessor - 1];
+ if ((eol) &&
+ ((processor->processor_socket_destination =
+ strndup(cur, eol - cur)) == NULL))
+ goto no_memory;
+ virSkipSpaces(&(processor->processor_socket_destination));
+
+ if ((cur = strstr(base, "vendor_id")) != NULL) {
+ cur = strchr(cur, ':') + 1;
+ eol = strchr(cur, '\n');
+ if ((eol) &&
+ ((processor->processor_manufacturer =
+ strndup(cur, eol - cur)) == NULL))
+ goto no_memory;
+ virSkipSpaces(&(processor->processor_manufacturer));
+ }
+
+ if ((cur = strstr(base, "cpu family")) != NULL) {
+ cur = strchr(cur, ':') + 1;
+ eol = strchr(cur, '\n');
+ if ((eol) &&
+ ((processor->processor_family = strndup(cur, eol -
cur)) ==
+
NULL))
+ goto no_memory;
+ virSkipSpaces(&(processor->processor_family));
+ }
+
+ if ((cur = strstr(base, "model name")) != NULL) {
+ cur = strchr(cur, ':') + 1;
+ eol = strchr(cur, '\n');
+ if ((eol) &&
+ ((processor->processor_type = strndup(cur, eol - cur))
==
+
NULL))
+ goto no_memory;
+ virSkipSpaces(&(processor->processor_type));
+ }
+
+ base = cur;
+ }
+
+ return 0;
+
+no_memory:
+ return -1;
+}
+
+static virSysinfoDefPtr
+virCPUInfoSysinfoRead(void) {
+ virSysinfoDefPtr ret = NULL;
+ char *outbuf = NULL;
+
+ if (VIR_ALLOC(ret) < 0)
+ goto no_memory;
+
+ if(virFileReadAll(CPUINFO, 20000, &outbuf) < 0) {
+ virSmbiosReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to open %s"), CPUINFO);
+ return NULL;
+ }
+
+ ret->nprocessor = 0;
+ ret->processor = NULL;
+ if (virSysinfoParseCPUInfoProcessor(outbuf, ret) < 0)
+ goto no_memory;
+
+ return ret;
+
+no_memory:
+ VIR_FREE(outbuf);
+ return NULL;
+}
+
virSysinfoDefPtr
virSysinfoRead(void) {
char *path;
@@ -605,10 +695,7 @@ virSysinfoRead(void) {
path = virFindFileInPath(SYSINFO_SMBIOS_DECODER);
if (path == NULL) {
- virSmbiosReportError(VIR_ERR_INTERNAL_ERROR,
- _("Failed to find path for %s binary"),
- SYSINFO_SMBIOS_DECODER);
- return NULL;
+ return virCPUInfoSysinfoRead();
}
cmd = virCommandNewArgList(path, "-q", "-t",
"0,1,4,17", NULL);
--
1.7.7
--
Prerna Saxena
Linux Technology Centre,
IBM Systems and Technology Lab,
Bangalore, India