Changeset 36643 in vbox for trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp

Timestamp:

Apr 11, 2011 1:29:08 PM (14 years ago)

Author:

vboxsync

Message:

HWVMXR0.cpp: probably a workaround for a REM bug.

File:

• trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR0/HWVMXR0.cpp

@@ -1536 +1536 @@
             val = pCtx->trHid.Attr.u;
 
-            /* The TSS selector must be busy. */
-            if ((val & 0xD) == X86_SEL_TYPE_SYS_286_TSS_AVAIL)
-                val = (val & ~0xF) | X86_SEL_TYPE_SYS_286_TSS_BUSY;
-            else
-                /* Default even if no TR selector has been set (otherwise vmlaunch will fail!) */
-                val = (val & ~0xF) | X86_SEL_TYPE_SYS_386_TSS_BUSY;
-
+            /* The TSS selector must be busy (REM bugs? see defect #XXXX). */
+            if (!(val & X86_SEL_TYPE_SYS_TSS_BUSY_MASK))
+            {
+                if (val & 0xf)
+                    val |= X86_SEL_TYPE_SYS_TSS_BUSY_MASK;
+                else
+                    /* Default if no TR selector has been set (otherwise vmlaunch will fail!) */
+                    val = (val & ~0xF) | X86_SEL_TYPE_SYS_386_TSS_BUSY;
+            }
+            AssertMsg((val & 0xf) == X86_SEL_TYPE_SYS_386_TSS_BUSY || (val & 0xf) == X86_SEL_TYPE_SYS_286_TSS_BUSY, ("%#x\n", val));
         }
         rc |= VMXWriteVMCS(VMX_VMCS32_GUEST_TR_ACCESS_RIGHTS, val);