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Re: [Xen-devel] mapping of memory below 16Mb

  • To: Jan Beulich <jbeulich@xxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Thu, 24 Jan 2008 16:39:12 +0000
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Thu, 24 Jan 2008 08:39:56 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Achep6Yk5HFhWsqaEdy57QAX8io7RQ==
  • Thread-topic: [Xen-devel] mapping of memory below 16Mb

On 24/1/08 16:35, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> That's a dom0 issue. Xen itself does not proactively mess with the MTRRs.
> Yes and no: Yes in the sense that Dom0 could be given an alternative
> hypercall to specify memory types. No in the sense that we already have
> such a hypercall (setting the MTRRs) that would simply need to do
> translation to PAT semantics rather than writing to the MTRR MSRs.

If Linux is getting native PAT support, then we shouldn't need MTRR->PAT
shimming code in Xen. And thank goodness for that!

 -- Keir

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