Changeset 47786 in vbox for trunk/src/VBox/VMM/include/internal

Timestamp:

Aug 16, 2013 8:59:32 AM (12 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

88047

Message:

PGM: Added a new page type for the VT-x APIC access page MMIO alias instead of abusing the MMIO2 aliasing. There are important differences, we can safely access the MMIO2 page when aliased and save time doing so, while the alias created by IOMMMIOMapMMIOHCPage must not be accessed outside the VT-x execution AFAIK.

File:

• trunk/src/VBox/VMM/include/internal/pgm.h (modified) (2 diffs)

trunk/src/VBox/VMM/include/internal/pgm.h

@@ -46 +46 @@
      * See PGMHandlerPhysicalPageAlias(). */
     PGMPAGETYPE_MMIO2_ALIAS_MMIO,
+    /** Special page aliased over an MMIO page. (RWX)
+     * See PGMHandlerPhysicalPageAliasHC(), but this is generally only used for
+     * VT-x's APIC access page at the moment.  Treated as MMIO by everyone except
+     * the shadow paging code. */
+    PGMPAGETYPE_SPECIAL_ALIAS_MMIO,
     /** Shadowed ROM. (RWX) */
     PGMPAGETYPE_ROM_SHADOW,
@@ -55 +60 @@
     PGMPAGETYPE_END
 } PGMPAGETYPE;
-AssertCompile(PGMPAGETYPE_END <= 7);
+AssertCompile(PGMPAGETYPE_END == 8);
 
 VMMDECL(PGMPAGETYPE) PGMPhysGetPageType(PVM pVM, RTGCPHYS GCPhys);