From: Junjie Cao <junjie.cao@linux.dev>
To: jamin_lin@aspeedtech.com, kraxel@redhat.com, marcandre.lureau@redhat.com
Cc: clg@kaod.org, peter.maydell@linaro.org, kane_chen@aspeedtech.com,
troy_lee@aspeedtech.com, qemu-arm@nongnu.org,
qemu-devel@nongnu.org, junjie.cao@intel.com,
junjie.cao@linux.dev
Subject: Re: [PATCH v7 1/8] hw/usb/bus: Let the controller ask for the automatic hub
Date: Thu, 29 Oct 2026 05:09:40 -0500 [thread overview]
Message-ID: <20261029100942.894066-1-junjie.cao@linux.dev> (raw)
In-Reply-To: <20261028034140.367393-2-jamin_lin@aspeedtech.com>
Hi Jamin,
On Wed, Oct 28, 2026 at 03:41:42AM +0000, Jamin Lin wrote:
> xHCI has up to 15 root ports, so it no longer grows a hub on its own. A
> user who wants more ports there adds "-device usb-hub".
qemu-xhci still defaults to 4 ports. With -M pc-q35-11.1, qemu-xhci and
five HID devices, a build without the series puts a hub on port 4 with
the last two behind it. On v7 the fifth device fails with "no free
ports".
Migration from an older QEMU breaks too. Four devices on qemu-xhci, saved
by a build without the series and loaded by v7 with the same command line:
Unknown section or instance '0000:00:01.0/4/usb-hub' 0
So for the xhci and ehci patches in v8 the flag needs to be a
property that hw_compat_11_1 keeps on for older machine types. For EHCI
that only matters with companions: q35 -usb (ich9 EHCI plus UHCI) puts
the hub on port 6 today.
Thanks,
Junjie
next prev parent reply other threads:[~2026-10-29 10:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-28 3:41 [PATCH v7 0/8] hw/usb: Add a usbredir server transport Jamin Lin
2026-10-28 3:41 ` [PATCH v7 1/8] hw/usb/bus: Let the controller ask for the automatic hub Jamin Lin
2026-10-29 10:09 ` Junjie Cao [this message]
2026-10-29 11:33 ` Gerd Hoffmann
2026-10-29 14:49 ` Junjie Cao
2026-10-29 17:44 ` marcandre.lureau
2026-10-28 3:41 ` [PATCH v7 2/8] hw/usb/redirect-server: Add a usbredir server device Jamin Lin
2026-10-28 3:41 ` [PATCH v7 3/8] hw/usb/redirect-server: Connect usbredirparser to a chardev Jamin Lin
2026-10-28 3:41 ` [PATCH v7 4/8] hw/usb/redirect-server: Announce the exported device Jamin Lin
2026-10-29 10:09 ` Junjie Cao
2026-10-29 17:44 ` marcandre.lureau
2026-10-28 3:41 ` [PATCH v7 5/8] hw/usb/redirect-server: Implement control transfers Jamin Lin
2026-10-29 17:44 ` marcandre.lureau
2026-10-28 3:41 ` [PATCH v7 6/8] hw/usb/redirect-server: Implement bulk and interrupt transfers Jamin Lin
2026-10-29 10:09 ` Junjie Cao
2026-10-30 2:01 ` Jamin Lin
2026-10-28 3:41 ` [PATCH v7 7/8] hw/usb/redirect-server: Stream interrupt IN endpoints Jamin Lin
2026-10-29 17:44 ` marcandre.lureau
2026-10-28 3:41 ` [PATCH v7 8/8] hw/arm/aspeed: Enable the usbredir server transport Jamin Lin
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