Changeset 91993 in vbox

Timestamp:

Oct 22, 2021 4:57:15 AM (3 years ago)

Author:

vboxsync

Message:

VMM: Nested VMX: bugref:10092 EPT PML4E effective RW permissions fix.

File:

• trunk/src/VBox/VMM/VMMAll/PGMAllGst.h (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/PGMAllGst.h

@@ -187 +187 @@
         Assert(!pVCpu->CTX_SUFF(pVM)->cpum.ro.GuestFeatures.fVmxModeBasedExecuteEpt);
         uint32_t const fEffectiveEpt = ((uint32_t)Pml4e.u & EPT_PML4E_ATTR_MASK) << PGMPTWALK_EFF_EPT_ATTR_SHIFT;
-        uint8_t const fReadWrite = RT_BF_GET(fEffectiveEpt, PGM_BF_PTWALK_EFF_R)
-                                 & RT_BF_GET(fEffectiveEpt, PGM_BF_PTWALK_EFF_W);
         uint8_t const fExecute   = RT_BF_GET(fEffectiveEpt, PGM_BF_PTWALK_EFF_X_SUPER);
+        uint8_t const fWrite     = RT_BF_GET(fEffectiveEpt, PGM_BF_PTWALK_EFF_W);
         uint8_t const fAccessed  = RT_BF_GET(fEffectiveEpt, PGM_BF_PTWALK_EFF_A);
         pWalk->Core.fEffective = fEffective = RT_BF_MAKE(PGM_BF_PTWALK_EFF_X,  fExecute)
-                                            | RT_BF_MAKE(PGM_BF_PTWALK_EFF_RW, fReadWrite)
+                                            | RT_BF_MAKE(PGM_BF_PTWALK_EFF_RW, fWrite)
                                             | RT_BF_MAKE(PGM_BF_PTWALK_EFF_US, 1)
                                             | RT_BF_MAKE(PGM_BF_PTWALK_EFF_A,  fAccessed)