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

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Dec 10, 2009 at 01:28:49PM +0200, Muli Ben-Yehuda wrote:
> 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?

With 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?

No idea.

> 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/