Re: [PATCH] Enable non page boundary BAR device assignment

[Muli Ben-Yehuda <muli@il.ibm.com>]

On Thu, Dec 10, 2009 at 12:56:56PM +0200, Michael S. Tsirkin wrote:

> > mmio and pio are easy, DMA you'd need an IOMMU for security, or
> > whatever uio does just for translation,
> 
> uio currently does not support DMA, but I plan to fix this

With or without an IOMMU?

> > and interrupts you probably get for free from uio. Seems eminently
> > doable to me. Why you'd want to is another matter :-)
> 
> The list above ignores the biggest issue: you would have to change
> TCG code generation to make this work.

Yep, I know nothing about TCG, only looking at this from the device
interaction side.

> I am not sure this problem is solvable unless host and guest
> architectures are very similar.

Now you are ignoring the most interesting issue, namely, why would you
want to solve it? What is the value of device assignment for TCG
targets?

Cheers,
Muli
-- 
Muli Ben-Yehuda | muli@il.ibm.com | +972-4-8281080
Manager, Virtualization and Systems Architecture
Master Inventor, IBM Research -- Haifa
Second Workshop on I/O Virtualization (WIOV '10):
http://sysrun.haifa.il.ibm.com/hrl/wiov2010/