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| author | Juergen Gross | 2017-06-14 17:12:45 +0200 |
|---|---|---|
| committer | Juergen Gross | 2017-06-15 08:50:32 +0200 |
| commit | 4a4c29c96dde0eefd69054fd9e6b4255d4717799 (patch) | |
| tree | d13f72b7468d13b163ec0102014d718c32ea66d3 /Documentation/ABI/testing/sysfs-hypervisor-xen | |
| parent | doc,xen: document hypervisor sysfs nodes for xen (diff) | |
| download | kernel-qcow2-linux-4a4c29c96dde0eefd69054fd9e6b4255d4717799.tar.gz kernel-qcow2-linux-4a4c29c96dde0eefd69054fd9e6b4255d4717799.tar.xz kernel-qcow2-linux-4a4c29c96dde0eefd69054fd9e6b4255d4717799.zip | |
xen: add sysfs node for guest type
Currently there is no reliable user interface inside a Xen guest to
determine its type (e.g. HVM, PV or PVH). Instead of letting user mode
try to determine this by various rather hacky mechanisms (parsing of
boot messages before they are gone, trying to make use of known subtle
differences in behavior of some instructions), add a sysfs node
/sys/hypervisor/guest_type to explicitly deliver this information as
it is known to the kernel.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-hypervisor-xen')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-hypervisor-xen | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-hypervisor-xen b/Documentation/ABI/testing/sysfs-hypervisor-xen new file mode 100644 index 000000000000..c0edb3fdd6eb --- /dev/null +++ b/Documentation/ABI/testing/sysfs-hypervisor-xen @@ -0,0 +1,34 @@ +What: /sys/hypervisor/guest_type +Date: May 2017 +KernelVersion: 4.13 +Contact: xen-devel@lists.xenproject.org +Description: If running under Xen: + Type of guest: + "Xen": standard guest type on arm + "HVM": fully virtualized guest (x86) + "PV": paravirtualized guest (x86) + "PVH": fully virtualized guest without legacy emulation (x86) + +What: /sys/hypervisor/pmu/pmu_mode +Date: August 2015 +KernelVersion: 4.3 +Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com> +Description: If running under Xen: + Describes mode that Xen's performance-monitoring unit (PMU) + uses. Accepted values are + "off" -- PMU is disabled + "self" -- The guest can profile itself + "hv" -- The guest can profile itself and, if it is + privileged (e.g. dom0), the hypervisor + "all" -- The guest can profile itself, the hypervisor + and all other guests. Only available to + privileged guests. + +What: /sys/hypervisor/pmu/pmu_features +Date: August 2015 +KernelVersion: 4.3 +Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com> +Description: If running under Xen: + Describes Xen PMU features (as an integer). A set bit indicates + that the corresponding feature is enabled. See + include/xen/interface/xenpmu.h for available features |