Re: [PATCH v2] port/xen: map memory directly in privcmd PRIVCMD_MMAPBATCH

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Jun 26, 2012 at 10:47:05AM +0100, Roger Pau Monne wrote:
> >informations. I think qemu should instruct the kernel that
> >things changed.
> 
> With the proposed patch, the kernel doesn't store the gfns anymore,
> since the mapping is done directly, and no pagefault handler is set.
> So the information (or the lack of it) stored by the NetBSD kernel
> is correct.

OK. As this is a mapping which isn't consuming dom0 memory I guess it
doesn't matter much that this area is not paged. But I think PRIVCMD_MMAP
and PRIVCMD_MMAPBATCH should behave the same. I don't like much the idea
of a mapping in user area that is unknown to UVM though, can't you make
qemu unmap and remap the area with the right information ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--