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From: Alan Stern <stern@rowland.harvard.edu>
To: Peter Geis <pgwipeout@gmail.com>
Cc: kvm@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [BUG] KVM USB passthrough did not claim interface before use
Date: Mon, 10 Oct 2022 10:07:16 -0400	[thread overview]
Message-ID: <Y0QnFHqrX2r/7oUz@rowland.harvard.edu> (raw)
In-Reply-To: <CAMdYzYrUOoTmBL2c_+=xLBMXg38Pp4hANnzqxoe1cVDDrFvqTA@mail.gmail.com>

On Mon, Oct 10, 2022 at 09:56:53AM -0400, Peter Geis wrote:
> Good Morning,
> 
> I've run into a bug with a new usb device when attempting to pass
> through using qemu-kvm. Another device is passed through without
> issue, and qemu spice passthrough does not exhibit the issue. The usb
> device shows up in the KVM machine, but is unusable. I'm unsure if
> this is a usbfs bug, a qemu bug, or a bug in the device driver.
> 
> usb 3-6.2: usbfs: process 365671 (CPU 2/KVM) did not claim interface 0
> before use
> usb 3-6.2: usbfs: process 365671 (CPU 2/KVM) did not claim interface 0
> before use
> usb 3-6.2: usbfs: process 365672 (CPU 3/KVM) did not claim interface 1
> before use
> usb 3-6.2: usbfs: process 365671 (CPU 2/KVM) did not claim interface 0
> before use
> usb 3-6.2: usbfs: process 365672 (CPU 3/KVM) did not claim interface 0
> before use
> usb 3-6.2: usbfs: process 365672 (CPU 3/KVM) did not claim interface 0
> before use

These are warnings, not bugs, although one could claim that the warnings 
are caused by a bug in qemu-kvm.

> The host system is Ubuntu 22.04.
> The qemu version is as shipped: QEMU emulator version 6.2.0 (Debian
> 1:6.2+dfsg-2ubuntu6.3)
> The host kernel version is: 5.15.0-48-generic #54-Ubuntu SMP Fri Aug
> 26 13:26:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
> 
> The VM is HomeAssistant, running kernel 5.15.67. Issue was also
> observed on kernel version 5.10.

Does the device work if your virtual machine has only one CPU?

Alan Stern

  reply	other threads:[~2022-10-10 14:07 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-10 13:56 [BUG] KVM USB passthrough did not claim interface before use Peter Geis
2022-10-10 14:07 ` Alan Stern [this message]
2022-10-10 14:22   ` Peter Geis
2022-10-10 15:01     ` Alan Stern
2022-10-11 18:49       ` Peter Geis
2022-10-12 21:14         ` Alan Stern
2022-10-16  0:36           ` Peter Geis
2022-10-16  1:33             ` Alan Stern
2022-10-23 18:14               ` Peter Geis

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