Re: [kvm-devel] [PATCH] Handle vma regions with no backing page (v2)

[Hollis B. <ho...@us...>]

On Tuesday 29 April 2008 17:17:49 Avi Kivity wrote:
> Anthony Liguori wrote:
> > This patch allows VMA's that contain no backing page to be used for guest
> > memory.  This is a drop-in replacement for Ben-Ami's first page in his 
direct
> > mmio series.  Here, we continue to allow mmio pages to be represented in 
the
> > rmap.
> >
> >   
> 
> I like this very much, as it only affects accessors and not the mmu core 
> itself.
> 
> Hollis/Xiantao/Carsten, can you confirm that this approach works for 
> you?  Carsten, I believe you don't have mmio, but at least this 
> shouldn't interfere.

OK, so the idea is to mmap /sys/bus/pci/.../region within the guest RAM area, 
and just include it within the normal guest RAM memslot?

How will the IOMMU be programmed? Wouldn't you still need to register a 
special type of memslot for that?

-- 
Hollis Blanchard
IBM Linux Technology Center