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Re: [Qemu-devel] Isochronous devices support in QEMU

From: David S. Ahern
Subject: Re: [Qemu-devel] Isochronous devices support in QEMU
Date: Mon, 22 Feb 2010 15:47:57 -0700
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David Ahern

On 02/22/2010 12:32 AM, Taimoor Mirza wrote:
> Hi all,
> I've few questions about QEMU:
> 1) I read in QEMU's official documentation that in case of using host
> system devices "USB devices requiring real time streaming (i.e. USB
> Video Cameras) are not supported yet". Also there is no isochronous
> transfer based virtual USB device in QEMU. I want to know what is
> current status of Iso. support in QEMU? Can I test my Linux based USB

As of commit 8e65b7c04965c8355e4ce43211582b6b83054e3d I have been able
to pass audio devices to a VM with good success (though I use qemu-kvm,
not just qemu).

I just started looking at web cameras and not having much luck yet.


> host application for ARM with physical iso devices in host USB port?
> 2) I found a function "ohci_service_iso_td" in usb-ohci.c file in QEMU
> source code.
> 3) I am developing a Linux based USB device using Gadget API. Does QEMU
> provide USB function controller emulation in such a way that I can run
> plug this USB device at run time with host machine and can test it?
> Regards,
> Taimoor
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