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systemd-detect-virt: only discover Xen domU

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The current vm detection lacks the distinction between Xen dom0 and Xen domU.
Both, dom0 and domU are running inside the hypervisor.
Therefore systemd-detect-virt and the ConditionVirtualization directive detect
dom0 as a virtual machine.

dom0 is not using virtual devices but is accessing the real hardware.
Therefore dom0 should be considered the virtualisation host and not a virtual
machine.

https://bugs.freedesktop.org/show_bug.cgi?id=77271
This commit is contained in:
Thomas Blume 2014-06-06 16:36:45 +02:00 committed by Lennart Poettering
parent 299a55075d
commit 37287585b6
Notes: Lennart Poettering 2014-06-11 13:11:23 +02:00 
Backport: bugfix
1 changed files with 27 additions and 7 deletions
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34
src/shared/virt.c
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@ -148,7 +148,7 @@ static int detect_vm_dmi(const char **_id) {
/* Returns a short identifier for the various VM implementations */
int detect_vm(const char **id) {
_cleanup_free_ char *hvtype = NULL, *cpuinfo_contents = NULL;
_cleanup_free_ char *domcap = NULL, *cpuinfo_contents = NULL;
static thread_local int cached_found = -1;
static thread_local const char *cached_id = NULL;
const char *_id = NULL;
@ -162,17 +162,37 @@ int detect_vm(const char **id) {
return cached_found;
}
/* Try high-level hypervisor sysfs file first:
/* Try xen capabilities file first, if not found try high-level hypervisor sysfs file:
*
* https://bugs.freedesktop.org/show_bug.cgi?id=61491 */
r = read_one_line_file("/sys/hypervisor/type", &hvtype);
* https://bugs.freedesktop.org/show_bug.cgi?id=77271 */
r = read_one_line_file("/proc/xen/capabilities", &domcap);
if (r >= 0) {
if (streq(hvtype, "xen")) {
char *cap, *i = domcap;
while ((cap = strsep(&i, ",")))
if (streq(cap, "control_d"))
break;
if (!i) {
_id = "xen";
r = 1;
goto finish;
}
} else if (r != -ENOENT)
goto finish;
} else if (r == -ENOENT) {
_cleanup_free_ char *hvtype = NULL;
r = read_one_line_file("/sys/hypervisor/type", &hvtype);
if (r >= 0) {
if (streq(hvtype, "xen")) {
_id = "xen";
r = 1;
goto finish;
}
} else if (r != -ENOENT)
return r;
} else
return r;
/* this will set _id to "other" and return 0 for unknown hypervisors */