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

  • To: Jan Beulich <jbeulich@xxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Tue, 29 Jan 2008 10:45:23 +0000
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 29 Jan 2008 02:47:29 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AchiZAy8Sw66r85XEdyyYwAX8io7RQ==
  • Thread-topic: [Xen-devel] Xen hypervisor hangs on booting against c/s 16925

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

 -- Keir

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