[PATCH 5/5] docs/pvh: document initial MTRR state

[Roger Pau Monne <roger.pau@citrix.com>]

Provided to both Dom0 and DomUs.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
---
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>
---
 docs/misc/pvh.markdown | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/docs/misc/pvh.markdown b/docs/misc/pvh.markdown
index e85fb15374..639401a887 100644
--- a/docs/misc/pvh.markdown
+++ b/docs/misc/pvh.markdown
@@ -92,3 +92,18 @@ event channels. Delivery of those interrupts can be configured in the same way
 as HVM guests, check xen/include/public/hvm/params.h and
 xen/include/public/hvm/hvm\_op.h for more information about available delivery
 methods.
+
+## MTRR ##
+
+### Unprivileged guests ###
+
+PVH guests are booted with the default MTRR type set to write-back and MTRR
+enabled. This allows DomUs to start with a sane MTRR state. Note that this will
+have to be revisited when pci-passthrough is added to PVH in order to set MMIO
+regions as UC.
+
+### Hardware domain ###
+
+A PVH hardware domain is booted with the same MTRR state as the one found on
+the host. This is done because the hardware domain memory map is already a
+modified copy of the host memory map, so the same MTRR setup should work.
-- 
2.17.0


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