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Re: [Xen-devel] mapping of memory below 16Mb
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] mapping of memory below 16Mb |
| From: | "Jan Beulich" <jbeulich@xxxxxxxxxx> |
| Date: | Thu, 24 Jan 2008 15:57:18 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 24 Jan 2008 07:57:18 -0800 |
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| In-reply-to: | <C3BE5EAE.1B616%Keir.Fraser@xxxxxxxxxxxx> |
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| References: | <4798B9B5.76E4.0078.0@xxxxxxxxxx> <C3BE5EAE.1B616%Keir.Fraser@xxxxxxxxxxxx> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
>> The WP attribute raises another question: Are there any plans to make >> Xen use PAT rather than (relying on) MTRRs? Linux folks seem to be >> finally getting closer to this, too, so even virtual PAT support may be >> needed in not too distant future... > >We already support PAT for both PV guests and HVM guests. Hmm, I must have missed this going in. Is the indexing into PAT then considered part of the ABI (as I can't see either a hypercall a guest could use to learn what bit combination to use for certain attributes or one to set a virtual PAT value)? And regardless of that, SVM code has no sign of handling accesses to the PAT MSR. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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