Changeset 10154 in vbox

Timestamp:

Jul 3, 2008 1:46:05 PM (17 years ago)

Author:

vboxsync

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

32686

Message:

Documented the issue wrt to CS RPL and conforming segment in CPUMGetGuestCPL.

File:

• trunk/src/VBox/VMM/VMMAll/CPUMAllRegs.cpp (modified) (2 diffs)

trunk/src/VBox/VMM/VMMAll/CPUMAllRegs.cpp

@@ -1818 +1818 @@
     uint32_t cpl;
 
+    /*
+     * The hidden CS.DPL register is always equal to the CPL, it is
+     * not affected by loading a conforming coding segment.
+     */
     if (CPUMAreHiddenSelRegsValid(pVM))
         cpl = pCtxCore->csHid.Attr.n.u2Dpl;
@@ -1824 +1828 @@
         if (RT_LIKELY(!pCtxCore->eflags.Bits.u1VM))
         {
+            /*
+             * The SS RPL is always equal to the CPL, while the CS RPL
+             * isn't necessarily equal if the segment is conforming.
+             * See section 4.11.1 in the AMD manual.
+             */
             cpl = (pCtxCore->ss & X86_SEL_RPL);
 #ifndef IN_RING0