Re: [PATCH] Xen/i386 cleanups - AGP bus/phys cleanups

[Paul Mackerras]

Rik van Riel writes:

> Thing is, the rest of the kernel uses virt_to_phys for
> two different things.  Only one of them has to do with
> the real physical address, the other is about getting
> the page frame number.

So fix the places that are using virt_to_phys to get the page frame
number to use virt_to_pfn instead. :)

> On native x86, x86-64 and others, the page frame number
> and physical address are directly related to each other.
> Under Xen, however, the two are different - and the
> AGPGART really needs to have the physical address ;)

If Xen is letting the kernel program the GART, you just lost any
memory isolation between partitions you might have been trying to
enforce. :)

Paul.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/