[Xen-devel] [PATCH v4 1/6] libxl: do not add a vkb backend to hvm guests

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

When QEMU restricts its xenstore connection, it cannot provide PV
backends. A separate QEMU instance is required to provide PV backends in
userspace, such as qdisk. With two separate instances, it is not
possible to take advantage of vkb for mouse and keyboard, as the QEMU
that emulates the graphic card (the device model), would be separate
from the QEMU running the vkb backend (PV QEMU).

Removing this functionality is acceptable, because is only useful for
power saving when usb emulation is off, letting QEMU sleep for longer
periods of time.  However usb emulation is on by default, and how to
take advantage of this configuration has never been documented.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 tools/libxl/libxl_create.c |    5 -----
 1 file changed, 5 deletions(-)

diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index f0da7dc..a74b340 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -1275,17 +1275,12 @@ static void domcreate_launch_dm(libxl__egc *egc, 
libxl__multidev *multidev,
     {
         libxl__device_console console;
         libxl__device device;
-        libxl_device_vkb vkb;
 
         init_console_info(gc, &console, 0);
         console.backend_domid = state->console_domid;
         libxl__device_console_add(gc, domid, &console, state, &device);
         libxl__device_console_dispose(&console);
 
-        libxl_device_vkb_init(&vkb);
-        libxl__device_vkb_add(gc, domid, &vkb);
-        libxl_device_vkb_dispose(&vkb);
-
         dcs->dmss.dm.guest_domid = domid;
         if (libxl_defbool_val(d_config->b_info.device_model_stubdomain))
             libxl__spawn_stub_dm(egc, &dcs->dmss);
-- 
1.7.10.4


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