From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KTULt-0007cK-BL for qemu-devel@nongnu.org; Thu, 14 Aug 2008 00:22:21 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KTULs-0007aq-5P for qemu-devel@nongnu.org; Thu, 14 Aug 2008 00:22:20 -0400 Received: from [199.232.76.173] (port=47254 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KTULs-0007af-0K for qemu-devel@nongnu.org; Thu, 14 Aug 2008 00:22:20 -0400 Received: from hera.kernel.org ([140.211.167.34]:58111) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1KTULr-0005Aj-Ce for qemu-devel@nongnu.org; Thu, 14 Aug 2008 00:22:19 -0400 From: Max Krasnyansky Date: Thu, 14 Aug 2008 04:22:08 +0000 Message-Id: Subject: [Qemu-devel] [PATCH 0/5] Various USB fixes and improvements Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kvm@vger.kernel.org, Max Krasnyansky This patch series started when I tried to share USB ports between four instances of Windows XP running on the same Linux box (under KVM). I quickly realized that current USB support is not very flexible. We do not handle devices disconnects, there is not way to assign certain USB ports to VM instance, etc. Once I fixed that I discovered that USB devices that I absolutely need in the VMs (Xilinx and Altera USB dongles) do not really work with QEMU. VMs were getting stuck, applications unhappy, etc. So I endded up rewriting UHCI and Linux host USB layers to make them fully async and to support multiple outstanding transactions. The result is quite nice. We can now assign USB buses to VM instances and devices are automatically connected to the VMs. Just do usb_add host:N.* in the console or -usbdevice command line option (N is the bus number). Also when device is disconnected from the host it's automatically removed from the guest. Host USB devices operate in fully async mode (except the control transfers). All the stalls and jerkiness due to long synchronous transactions is gone. I can easily hook up four different USB devices (mouse, CF card reader, phone, Xilinx dongle) and everything is working perfectly. Mouse movements are silky smooth :). I did some profiling with OProfile and we seems to be doing ok while XP is pumping ~10 MBytes over USB (reported by one of the apps I'm using). UHCI stuff is well below VNC for example. There is more work to be done (async control transfers for example). But I think this is way better than what we have now and is ready for more testing by wider audience. Most of the testing so far was done with KVM flavor of QEMU. I did test generic i386-softmmu target a bit, it's too slow for any serious testing with XP. I did full compile (all targets) too and it went fine. Max Krasnyansky (5): husb: support for USB host device auto disconnect. husb: support for USB host device auto connect. usb: generic packet handler cleanup and documentation uhci: rewrite UHCI emulator, fully async operation with multiple outstanding transactions husb: rewrite Linux host USB layer, fully async operation hw/usb-uhci.c | 897 ++++++++++++++++++++++++++++++++++----------------------- hw/usb.c | 265 ++++++++++-------- hw/usb.h | 37 +++- usb-linux.c | 675 +++++++++++++++++++++++++------------------ vl.c | 83 +++--- 5 files changed, 1160 insertions(+), 797 deletions(-)