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libxl: load on FreeBSD

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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.
This commit is contained in:
Roman Bogorodskiy 2015-05-24 18:42:41 +03:00
parent 0a33bba1ae
commit f57842ecfd
1 changed files with 21 additions and 19 deletions
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40
src/libxl/libxl_driver.c
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@ -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_XENSTORED " exist");
return ret;
}