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libxl: Check for control_d string to decide about dom0

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As soon as any guest mounts xenfs to /proc/xen, there is a capabilities
file in that directory. However it returns nothing when reading from it.
Change the test to actually check the contents of the file.

BugLink: http://bugs.launchpad.net/bugs/1248025

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
(cherry picked from commit 8c869ad9f9c5d57ba0ef516835a08afdba7ad828)
This commit is contained in:
Stefan Bader 2014-03-12 13:03:26 +01:00 committed by Cole Robinson
parent a36e39cf89
commit 7400b8571c
1 changed files with 12 additions and 2 deletions
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14
src/libxl/libxl_driver.c
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@ -783,6 +783,7 @@ libxlDriverShouldLoad(bool privileged)
bool ret = false;
virCommandPtr cmd;
int status;
char *output = NULL;
/* Don't load if non-root */
if (!privileged) {
@ -790,8 +791,17 @@ libxlDriverShouldLoad(bool privileged)
return ret;
}
/* Don't load if not running on a Xen control domain (dom0) */
if (!virFileExists("/proc/xen/capabilities")) {
/*
* 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("/proc/xen/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");