Re: [Xen-devel] Xen hypervisor hangs on booting against c/s 16925

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29/1/08 10:34, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Otoh, with
> PAGE_HYPERVISOR_NOCACHE encoding UC- rather than UC, mapping
> WP MTRR regions this way would yield (model specific) WC, which again
> seems suspicious, so maybe the VGA hole should simply be kept (from
> boot, at UC-), but everything else should be forced to UC (or MTRRs
> should be inquired so that at least WP regions can be kept WP).

If we don't write to a MTRR WP region, then actually mapping as WC does not
matter. We never write to the range 0xc0000-0xfffff. Anything we write to
below 0xa0000 had better be RAM, or we've got bigger problems than the WP
attribute!

 -- Keir



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