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[Xen-devel] [PATCH 2/2] MTRR/PAT virtualization
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| Subject: | [Xen-devel] [PATCH 2/2] MTRR/PAT virtualization |
| From: | "Su, Disheng" <disheng.su@xxxxxxxxx> |
| Date: | Mon, 8 Oct 2007 15:37:01 +0800 |
| Delivery-date: | Mon, 08 Oct 2007 00:38:18 -0700 |
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| Thread-index: | AcgJfgOMNYMjMAQ5SNKtmVOEvHhrmg== |
| Thread-topic: | [PATCH 2/2] MTRR/PAT virtualization |
mtrr_pat.patch: basic MTRR/PAT virtualization.
The basic idea is listed below:
a. MTRR/PAT MSRs are per vcpu. The value of guest MTRR is
initialized in host, after guest E820 table is build. The value of guest
PAT is initialized as SDM. The host PAT is initialized to cover all the
page attributes.
b. The guest page attribute is virtualized through shadow page
attribute. First, get the effective guest page attribute, by calculating
from the combination of guest MTRR/PAT. Then the shadow page attribute
is calculated from effective guest page attribute and host MTRR. If
conflict occurs(e.g effective guest page attribute is WB, host MTRR of
this range is UC, can't set this page attribute as guest required), set
this range as UC. Some lookup tables are added to accelerate above
procedure.
Signed-off-by: Disheng Su <disheng.su@xxxxxxxxx>
Best Regards,
Disheng, Su
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