On Sun, May 24, 2015 at 06:45:02PM +0300, Roman Bogorodskiy wrote:
The libxl tries to check if it's running in dom0 by parsing
/proc/xen/capabilities and if that fails it doesn't load.
There's no procfs interface in Xen on FreeBSD, so this check always
fails.
In addition to checking procfs, check if /dev/xen/xenstored, that's enough to
check if we're running in dom0 in FreeBSD case.
---
src/libxl/libxl_driver.c | 42 ++++++++++++++++++++++--------------------
1 file changed, 22 insertions(+), 20 deletions(-)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 12be816..fddafa1 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -74,6 +74,7 @@ VIR_LOG_INIT("libxl.libxl_driver");
#define LIBXL_CONFIG_FORMAT_SEXPR "xen-sxpr"
#define HYPERVISOR_CAPABILITIES "/proc/xen/capabilities"
+#define HYPERVISOR_XENSTORED "/dev/xen/xenstored"
/* Number of Xen scheduler parameters */
#define XEN_SCHED_CREDIT_NPARAM 2
@@ -427,8 +428,6 @@ static bool
libxlDriverShouldLoad(bool privileged)
{
bool ret = false;
- int status;
- char *output = NULL;
/* Don't load if non-root */
if (!privileged) {
@@ -436,24 +435,27 @@ libxlDriverShouldLoad(bool privileged)
return ret;
}
- if (!virFileExists(HYPERVISOR_CAPABILITIES)) {
- VIR_INFO("Disabling driver as " HYPERVISOR_CAPABILITIES
- " does not exist");
- return ret;
- }
- /*
- * Don't load if not running on a Xen control domain (dom0). It is not
- * sufficient to check for the file to exist as any guest can mount
- * xenfs to /proc/xen.
- */
- status = virFileReadAll(HYPERVISOR_CAPABILITIES, 10, &output);
- if (status >= 0)
- status = strncmp(output, "control_d", 9);
- VIR_FREE(output);
- if (status) {
- VIR_INFO("No Xen capabilities detected, probably not running "
- "in a Xen Dom0. Disabling libxenlight driver");
-
+ if (virFileExists(HYPERVISOR_CAPABILITIES)) {
+ int status;
+ char *output = NULL;
+ /*
+ * Don't load if not running on a Xen control domain (dom0). It is not
+ * sufficient to check for the file to exist as any guest can mount
+ * xenfs to /proc/xen.
+ */
+ status = virFileReadAll(HYPERVISOR_CAPABILITIES, 10, &output);
+ if (status >= 0)
+ status = strncmp(output, "control_d", 9);
+ VIR_FREE(output);
+ if (status) {
+ VIR_INFO("No Xen capabilities detected, probably not running "
+ "in a Xen Dom0. Disabling libxenlight driver");
+
+ return ret;
+ }
+ } else if (!virFileExists(HYPERVISOR_XENSTORED)) {
+ VIR_INFO("Disabling driver as neither " HYPERVISOR_CAPABILITIES
+ " nor " HYPERVISOR_CAPABILITIES " exist");
s/HYPERVISOR_CAPABILITIES/HYPERVISOR_XENSTORED/ ACK with that changed.
return ret;
}
--
2.3.7
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