linux-kernel - Re: USB mini-summit at LinuxCon Vancouver

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Message-ID: <20110610194815.GA6646@xanatos>
Date:	Fri, 10 Jun 2011 12:48:15 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-usb@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, libusb-devel@...ts.sourceforge.net,
	Alexander Graf <agraf@...e.de>,
	Gerd Hoffmann <kraxel@...hat.com>, hector@...cansoft.com,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	pbonzini@...hat.com, Anthony Liguori <aliguori@...ibm.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>, Felipe Balbi <balbi@...com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Clemens Ladisch <clemens@...isch.de>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans de Goede <hdegoede@...hat.com>
Subject: Re: USB mini-summit at LinuxCon Vancouver

On Thu, Jun 09, 2011 at 08:18:05PM -0700, Greg KH wrote:
> On Thu, Jun 09, 2011 at 05:21:03PM -0700, Sarah Sharp wrote:
> > Topic 1
> > -------
> > 
> > The KVM folks suggested that it would be good to get USB and
> > virtualization developers together to talk about how to virtualize the
> > xHCI host controller.  The xHCI spec architect worked closely with
> > VMWare to get some extra goodies in the spec to help virtualization, and
> > I'd like to see the other virtualization developers take advantage of
> > that.  I'd also like us to hash out any issues they have been finding in
> > the USB core or xHCI driver during the virtualization effort.
> 
> Do people really want to virtualize the whole xHCI controller, or just
> specific ports or devices to the guest operating system?

A host OS could chose to virtualize the whole xHCI controller if it
wanted to.  That's part of the reason why xHCI does all the bandwidth
checking in hardware, not in software.

> If just specific ports, would something like usbip be better for virtual
> machines, with the USB traffic going over the network connection between
> the guest/host?

It could be done that way too.  But that doesn't help if you're trying
to run Windows under Linux, right?  Only if all the guest OSes use the
same USB IP protocol then it would work.

> > Hope to see you there!
> 
> Thanks for putting this together.
> 
> Do we need to sign up somewhere to give the organizers a sense of how
> many people will be attending?

I private ack by email would be great.  Or you can ack by facebook:
https://www.facebook.com/event.php?eid=229532200405657  I could add the
event in upcoming.yahoo.com if anyone uses that.

Sarah Sharp
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