1006-libxl-use-EHCI-for-providing-tablet-USB-device.patch

From 3ceba6a97da58c0ef1c5b8a8e54409de902a2022 Mon Sep 17 00:00:00 2001
From: alcreator <24826469+alcreator@users.noreply.github.com>
Date: Mon, 17 Sep 2018 23:01:36 +1000
Subject: [PATCH 1006/1018] libxl: use EHCI for providing tablet USB device
MIME-Version: 1.0
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Linux guest by default do not enable USB autosuspend for UHCI controller
emulated by QEMU, which increase idle CPU usage. To avoid guest
modification, resolve it by switching to EHCI controller, for which
Linux behave correctly.

Signed-off-by: alcreator <24826469+alcreator@users.noreply.github.com>
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
 tools/libs/light/libxl_dm.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/tools/libs/light/libxl_dm.c b/tools/libs/light/libxl_dm.c
index 02da900a6f39..aba36518a9f4 100644
--- a/tools/libs/light/libxl_dm.c
+++ b/tools/libs/light/libxl_dm.c
@@ -1463,18 +1463,20 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
                 LOGD(ERROR, guest_domid, "Both usbdevice and usbdevice_list set");
                 return ERROR_INVAL;
             }
-            flexarray_append(dm_args, "-usb");
+            flexarray_append_pair(dm_args,
+                                  "-device", "usb-ehci,id=ehci");
             if (b_info->u.hvm.usbdevice) {
-                flexarray_vappend(dm_args,
-                                  "-usbdevice", b_info->u.hvm.usbdevice, NULL);
+                flexarray_vappend(dm_args, "-device",
+                                  GCSPRINTF("usb-%s,bus=ehci.0",
+                                            b_info->u.hvm.usbdevice),
+                                  NULL);
             } else if (b_info->u.hvm.usbdevice_list) {
                 char **p;
                 for (p = b_info->u.hvm.usbdevice_list;
                      *p;
                      p++) {
-                    flexarray_vappend(dm_args,
-                                      "-usbdevice",
-                                      *p, NULL);
+                    flexarray_vappend(dm_args, "-device",
+                                      GCSPRINTF("usb-%s,bus=ehci.0", *p), NULL);
                 }
             }
         } else if (b_info->u.hvm.usbversion) {
-- 
2.37.3