[Xen-devel] [PATCH] docs/misc: document PV control/feature keys for laptop/slate mode

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

Commit 4c8153d9 "add ACPI device for Windows laptop/slate mode switch"
added code to provide an 'laptop/slate mode' ACPI device to guests.

When present this device is used by Microsoft Windows to bind a HID
driver which controls whether the Windows desktop appearance is optimized
for laptop/desktop or slate/tablet PCs. The mechanism for switching
between modes is to open a handle to this driver and write a byte of
arbitrary data.

This patch documents xenstore keys such that a PV agent running in a
Windows guest can advertise the capability to, and receive instruction
from, a toolstack to cause such a mode switch.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 docs/misc/xenstore-paths.markdown | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/docs/misc/xenstore-paths.markdown 
b/docs/misc/xenstore-paths.markdown
index 5d89ed8..6c80a9e 100644
--- a/docs/misc/xenstore-paths.markdown
+++ b/docs/misc/xenstore-paths.markdown
@@ -435,6 +435,21 @@ XS_RESET_WATCHES xenstore message. See
 [xen/include/public/io/xs\_wire.h][XSWIRE] for the XenStore wire
 protocol definition.
 
+#### ~/control/laptop-slate-mode = (""|"laptop"|"slate") [w]
+
+This is the PV laptop/slate mode control node. If the toolstack has
+provisioned a guest with the ACPI laptop/slate mode device then it
+can write the desired mode here to cause the guest to switch modes if
+necessary. The guest acknowledges a request by writing the empty
+string back to the control node.
+
+#### ~/control/feature-laptop-slate-mode = (""|"0"|"1") [w]
+
+This may be initialized to "" by the toolstack and may then be set
+to 0 or 1 by a guest to indicate whether it is capable or incapable,
+respectively, of responding to a mode value written to
+~/control/laptop-slate-mode.
+
 ### Domain Controlled Paths
 
 #### ~/data/* [w]
-- 
2.1.4


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