Re: [Qemu-devel] [V3 3/4] hw/i386: ACPI table for AMD IO MMU

[Michael S. Tsirkin]

On Thu, Jan 14, 2016 at 03:15:38PM +0300, David kiarie wrote:
> On Thu, Jan 14, 2016 at 1:09 PM, Michael S. Tsirkin <address@hidden> wrote:
> > On Thu, Jan 14, 2016 at 11:04:27AM +0300, David Kiarie wrote:
> >> Add IVRS table for AMD IO MMU. Also reverve MMIO
> >
> > reserve?
> 
> Yeah, typo.
> 
> >
> >> region for IO MMU via ACPI
> >
> >
> > It does not look like you reserve anything.
> >
> > Pls add a link to hardware spec (in
> > the device implementation) so we can check
> > what does real hardware do.
> >
> > If this is it:
> > http://developer.amd.com/wordpress/media/2012/10/488821.pdf
> >
> > then the way that works seems to be by guest
> > programming the MMIO base.
> > We should do the same: patch seabios and EFI to do this.
> 
> Yes, that's the spec.
> 
> We thought this could be possible via ACPI (without patching BIOS ), no ?

I don't see how. We should do it the way it happens on real hardware.

-- 
MST