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| author | Per Bilse <per.bilse@citrix.com> | 2023-01-03 13:02:13 +0000 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2023-02-13 06:53:19 +0100 |
| commit | 415dab3c179632d098aadc756b39cebceb977978 (patch) | |
| tree | 46521e2cc2c75e7d3a9692dbe8c3a61746a703f6 /Documentation/ABI/stable | |
| parent | ceaa837f96adb69c0df0397937cd74991d5d821a (diff) | |
| download | linux-stable-415dab3c179632d098aadc756b39cebceb977978.tar.gz linux-stable-415dab3c179632d098aadc756b39cebceb977978.tar.bz2 linux-stable-415dab3c179632d098aadc756b39cebceb977978.zip | |
drivers/xen/hypervisor: Expose Xen SIF flags to userspace
/proc/xen is a legacy pseudo filesystem which predates Xen support
getting merged into Linux. It has largely been replaced with more
normal locations for data (/sys/hypervisor/ for info, /dev/xen/ for
user devices). We want to compile xenfs support out of the dom0 kernel.
There is one item which only exists in /proc/xen, namely
/proc/xen/capabilities with "control_d" being the signal of "you're in
the control domain". This ultimately comes from the SIF flags provided
at VM start.
This patch exposes all SIF flags in /sys/hypervisor/start_flags/ as
boolean files, one for each bit, returning '1' if set, '0' otherwise.
Two known flags, 'privileged' and 'initdomain', are explicitly named,
and all remaining flags can be accessed via generically named files,
as suggested by Andrew Cooper.
Signed-off-by: Per Bilse <per.bilse@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230103130213.2129753-1-per.bilse@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'Documentation/ABI/stable')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-hypervisor-xen | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-hypervisor-xen b/Documentation/ABI/stable/sysfs-hypervisor-xen index 748593c64568..be9ca9981bb1 100644 --- a/Documentation/ABI/stable/sysfs-hypervisor-xen +++ b/Documentation/ABI/stable/sysfs-hypervisor-xen @@ -120,3 +120,16 @@ Contact: xen-devel@lists.xenproject.org Description: If running under Xen: The Xen version is in the format <major>.<minor><extra> This is the <minor> part of it. + +What: /sys/hypervisor/start_flags/* +Date: March 2023 +KernelVersion: 6.3.0 +Contact: xen-devel@lists.xenproject.org +Description: If running under Xen: + All bits in Xen's start-flags are represented as + boolean files, returning '1' if set, '0' otherwise. + This takes the place of the defunct /proc/xen/capabilities, + which would contain "control_d" on dom0, and be empty + otherwise. This flag is now exposed as "initdomain" in + addition to the "privileged" flag; all other possible flags + are accessible as "unknownXX". |