[xen staging] docs: document ~/control/sysrq

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[xen staging] docs: document ~/control/sysrq

commit e6a8fe423e87df5793a46e624bd5eccf92e3ac13
Author:     Wei Liu <[hidden email]>
AuthorDate: Wed Sep 5 15:05:01 2018 +0100
Commit:     Wei Liu <[hidden email]>
CommitDate: Tue Sep 11 08:54:22 2018 +0100

    docs: document ~/control/sysrq
    Signed-off-by: Wei Liu <[hidden email]>
    Acked-by: Juergen Gross <[hidden email]>
    Reviewed-by: Roger Pau Monné <[hidden email]>
 docs/misc/xenstore-paths.markdown | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/docs/misc/xenstore-paths.markdown b/docs/misc/xenstore-paths.markdown
index 60c8b3fbe5..33d281915c 100644
--- a/docs/misc/xenstore-paths.markdown
+++ b/docs/misc/xenstore-paths.markdown
@@ -410,6 +410,14 @@ by udev ("0") or will be run by the toolstack directly ("1").
 ### Platform Feature and Control Paths
+#### ~/control/sysrq = (""|COMMAND) [w]
+This is the PV SysRq control node. A toolstack can write a single character
+representing a magic SysRq key understood by the Linux kernel.  The guest
+acknowledges a request by writing the empty string back to the command node.
+This protocol is Linux only.
 #### ~/control/shutdown = (""|COMMAND) [w]
 This is the PV shutdown control node. A toolstack can write various
generated by git-patchbot for /home/xen/git/xen.git#staging

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