Changeset 12756 in vbox

Timestamp:

Sep 26, 2008 8:25:57 AM (17 years ago)

Author:

vboxsync

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

37082

Message:

Attempt to correct hidden selector attributes when switching from real to protected mode. (VT-x weirdness again)

Location:

trunk/src/VBox/VMM/VMMR0

Files:

trunk/src/VBox/VMM/VMMR0/HWSVMR0.h

-              r12702
+              r12756
  * Runs guest code in an AMD-V VM.
+ *
- * @note NEVER EVER turn on interrupts here. Due to our illegal entry into the
- *       kernel, it might mess things up. (XP kernel traps have been frequently
- *       observed.) [obsolete?]
+ *
  * @returns VBox status code.
  * @param   pVM         The VM to operate on.

-              r12751
+              r12756
+    }
+    /* Current guest paging mode. */
+    pVM->hwaccm.s.vmx.enmCurrGuestMode = PGMMODE_REAL;
 #ifdef LOG_ENABLED
     SUPR0Printf("VMXR0InitVM %x VMCS=%x (%x)\n", pVM, pVM->hwaccm.s.vmx.pVMCS, (uint32_t)pVM->hwaccm.s.vmx.pVMCSPhys);
 …
     if (pVM->hwaccm.s.fContextUseFlags & HWACCM_CHANGED_GUEST_SEGMENT_REGS)
+    {
+        PGMMODE enmGuestMode = PGMGetGuestMode(pVM);
+        if (pVM->hwaccm.s.vmx.enmCurrGuestMode != enmGuestMode)
+        {
+            if (    pVM->hwaccm.s.vmx.enmCurrGuestMode == PGMMODE_REAL
+                &&  enmGuestMode == PGMMODE_PROTECTED)
+            {
+                pCtx->csHid.Attr.n.u2Dpl = 0;
+                pCtx->dsHid.Attr.n.u2Dpl = 0;
+                pCtx->esHid.Attr.n.u2Dpl = 0;
+                pCtx->fsHid.Attr.n.u2Dpl = 0;
+                pCtx->gsHid.Attr.n.u2Dpl = 0;
+                pCtx->ssHid.Attr.n.u2Dpl = 0;
+            }
+            pVM->hwaccm.s.vmx.enmCurrGuestMode = enmGuestMode;
+        }
         /* VT-x will fail with a guest invalid state otherwise... */
         if (   CPUMIsGuestInRealModeEx(pCtx)

-              r12730
+              r12756
 /**
  * Runs guest code in a VT-x VM.
+ *
- * @note NEVER EVER turn on interrupts here. Due to our illegal entry into the
- *       kernel, it might mess things up. (XP kernel traps have been frequently
- *       observed) [obsolete?]
+ *
  * @returns VBox status code.

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