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Mon, 12 Oct 2026 02:16:35 +0000 From: Jamin Lin To: =?iso-8859-1?Q?C=E9dric_Le_Goater?= , Peter Maydell , Steven Lee , Troy Lee , Kane Chen , Andrew Jeffery , Joel Stanley , "open list:ASPEED BMCs" , "open list:All patches CC here" CC: Jamin Lin , Troy Lee Subject: [PATCH v3 0/8] hw/usb: Add a usbredir server transport Thread-Topic: [PATCH v3 0/8] hw/usb: Add a usbredir server transport Thread-Index: AQHdWe+0scw4Tjcj60yshy0Jz4Mc/A== Date: Mon, 12 Oct 2026 02:16:35 +0000 Message-ID: <20261012021634.2006424-1-jamin_lin@aspeedtech.com> Accept-Language: zh-TW, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: mx.microsoft.com 1; dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=aspeedtech.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: SEZPR06MB7362:EE_|SEYPR06MB5398:EE_ x-ms-office365-filtering-correlation-id: 4aa16933-62a5-41cf-1e44-08df2806d74a x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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envelope-from=jamin_lin@aspeedtech.com; helo=TYPPR03CU001.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org This series adds a usbredir server transport to redirect a USB device=0A= emulated in one QEMU instance to a USB host controller emulated in=0A= another one over the usbredir protocol.=0A= =0A= The v1 series included both the usbredir server transport and the ASPEED=0A= AST1030 USB Device Controller (UDC) support. Following review feedback,=0A= this series contains only the usbredir server transport. The ASPEED=0A= AST1030 UDC support will be sent separately.=0A= =0A= This work is part of a larger plan to model USB device-side support on=0A= ASPEED BMC/BIC SoCs, which has three goals:=0A= =0A= 1. Model the ASPEED UDC (AST2600 / AST1030). The AST2600 also has USB host= =0A= (EHCI) controllers, so that work targets the AST2600 UDC: its gadget can= =0A= be attached to the SoC's own EHCI bus, letting the guest enumerate its= =0A= own gadget and exercise the UDC end-to-end. [Done]=0A= https://lore.kernel.org/qemu-devel/20260902021542.3194812-1-jamin_lin@as= peedtech.com/=0A= =0A= 2. AST1030 UDC. The AST1030 has no USB host controller, so testing its UDC= =0A= needs a second QEMU instance. The UDC gadget is redirected out of the=0A= guest with libusbredir and attached to another QEMU that runs a USB host= =0A= (a VMM, or an AST2600 / AST2700 guest). [this series]=0A= =0A= 3. ASPEED vHub, as a longer-term goal towards BMC KVM / Virtual Media=0A= support in QEMU. [future]=0A= =0A= This series implements goal 2.=0A= =0A= The transport=0A= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A= =0A= x-usb-redir-server exports a locally emulated USB device to a remote USB=0A= host over the usbredir protocol, so a device emulated in one QEMU instance= =0A= can be enumerated by a host controller emulated in another one.=0A= =0A= The left column is a request going to the device. The right column is the= =0A= answer coming back. The middle hop carries usbredir messages over a=0A= socket. The top and bottom hops carry USBPackets inside QEMU.=0A= =0A= remote QEMU: guest driver -> EHCI/XHCI=0A= | ^=0A= USBPacket | | USBPacket=0A= v |=0A= "usb-redir" (the client)=0A= | ^=0A= usbredir | chardev socket | usbredir=0A= v |=0A= x-usb-redir-server (the server, this series)=0A= | ^=0A= USBPacket | | USBPacket=0A= v |=0A= any USBDevice, "-device ,bus=3D.0"=0A= =0A= "usb-redir" (hw/usb/redirect.c) is the client:=0A= - it takes a USBPacket from the remote guest and writes it to the socket= =0A= as a usbredir message=0A= - it reads the answer from the socket and completes the USBPacket=0A= =0A= x-usb-redir-server is the server. It does the same thing, but backwards:=0A= - it reads a usbredir message from the socket and runs it as a USBPacket= =0A= on the bus below=0A= - it takes the result of that USBPacket and writes it back to the same=0A= socket as a usbredir message, for the client to read=0A= =0A= A USB device has to sit on a USB bus, and in QEMU a USB bus is always made= =0A= by a host controller. So x-usb-redir-server makes one and acts as the host= =0A= controller on this side. It models no real chip: its cable is the chardev= =0A= socket. The real host is in the other QEMU.=0A= =0A= The type name has an "x-" prefix because the device is experimental. It=0A= has to sit on the sysbus so that "-device ,bus=3D.0" can find the= =0A= USB bus it provides, and that may change later.=0A= =0A= usbredir carries one device, not a bus. A hub cannot be exported: the=0A= protocol has no device address field. To export several devices, run one=0A= x-usb-redir-server per device, each with its own chardev.=0A= =0A= Testing=0A= =3D=3D=3D=3D=3D=3D=3D=0A= =0A= A plain usb-storage device was used to test the transport. The storage=0A= device is attached to x-usb-redir-server and exported over a Unix socket:= =0A= =0A= $ qemu-system-aarch64 ...=0A= -chardev socket,id=3Dusbredir0,path=3D/tmp/usbredir0.sock,server=3Don,wait= =3Doff=0A= -device x-usb-redir-server,id=3Dusbredir0,chardev=3Dusbredir0=0A= -drive id=3Dusbdisk,if=3Dnone,file=3Dimage0.ext4,format=3Draw=0A= -device usb-storage,bus=3Dusbredir0.0,id=3Dmystorage,drive=3Dusbdisk=0A= =0A= The exported device can then be attached to EHCI bus 3 of an AST2700=0A= guest using the existing usb-redir client:=0A= =0A= -chardev socket,id=3Dstorage,path=3D/tmp/usbredir0.sock,reconnect-ms=3D= 1000 \=0A= -device usb-redir,chardev=3Dstorage,bus=3Dusb-bus.3=0A= =0A= The AST2700 Linux guest enumerates the redirected USB storage device:=0A= =0A= root@ast2700-default:~# lsusb=0A= unable to initialize usb spec=0A= Bus 001 Device 001: ID 1d6b:0001 Linux 6.18.36-v00.08.03-gaf2f426c5786 uhci= _hcd Generic UHCI Host Controller=0A= Bus 002 Device 001: ID 1d6b:0002 Linux 6.18.36-v00.08.03-gaf2f426c5786 ehci= _hcd EHCI Host Controller=0A= Bus 002 Device 002: ID 46f4:0001 QEMU QEMU USB HARDDRIVE=0A= =0A= This also demonstrates that x-usb-redir-server is not specific to the=0A= ASPEED UDC. Any USBDevice can be attached to its USB bus and exported=0A= to a host controller in another QEMU instance.=0A= =0A= v1:=0A= 1. Add a usbredir server device=0A= 2. Announce the exported device=0A= 3. Implement control transfers=0A= 4. Implement bulk and interrupt transfers=0A= 5. Stream interrupt IN endpoints=0A= =0A= v2:=0A= 1. Split the original series into USB and ASPEED parts as suggested=0A= during review.=0A= 2. Keep this series focused on the usbredir server transport.=0A= 3. Move the ASPEED UDC changes, AST1030 UDC support and its functional=0A= test to a separate series.=0A= =0A= v3:=0A= 1. Move include/hw/usb/redirect-server.h into redirect-server.c.=0A= 2. Drop the announce timer. The firmware does not toggle the pull-up,=0A= and the delay would be machine specific anyway.=0A= 3. Rename the type to "x-usb-redir-server" to mark it experimental.=0A= =0A= =0A= Jamin Lin (8):=0A= hw/usb/bus: Let a bus opt out of automatic hub insertion=0A= hw/usb/redirect-server: Add a usbredir server device=0A= hw/usb/redirect-server: Connect usbredirparser to a chardev=0A= hw/usb/redirect-server: Announce the exported device=0A= hw/usb/redirect-server: Implement control transfers=0A= hw/usb/redirect-server: Implement bulk and interrupt transfers=0A= hw/usb/redirect-server: Stream interrupt IN endpoints=0A= hw/arm/aspeed: Enable the usbredir server transport=0A= =0A= include/hw/usb/usb.h | 1 +=0A= hw/arm/aspeed.c | 7 +=0A= hw/usb/bus.c | 3 +-=0A= hw/usb/redirect-server.c | 1669 ++++++++++++++++++++++++++++++++++++++=0A= hw/usb/meson.build | 3 +-=0A= hw/usb/trace-events | 27 +=0A= 6 files changed, 1708 insertions(+), 2 deletions(-)=0A= create mode 100644 hw/usb/redirect-server.c=0A= =0A= -- =0A= 2.53.0=0A=