Changeset 71266 in vbox for trunk/src/VBox/VMM/VMMAll

Timestamp:

Mar 8, 2018 6:25:26 AM (7 years ago)

Author:

vboxsync

Message:

VMM/APIC: Allow Hyper-V paravirt. guests to read reserved LDR+1 (0x80e) APIC MSR rather than #GP.

File:

• trunk/src/VBox/VMM/VMMAll/APICAll.cpp (modified) (1 diff)

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

@@ -1964 +1964 @@
             }
 
+            /*
+             * Windows guest using Hyper-V x2APIC MSR compatibility mode tries to read the "high"
+             * LDR bits, which is quite absurd (as it's a 32-bit register) using this invalid MSR
+             * index (0x80E), see @bugref{8382#c175}.
+             */
+            case MSR_IA32_X2APIC_LDR + 1:
+            {
+                if (pApic->fHyperVCompatMode)
+                    *pu64Value = 0;
+                else
+                    rcStrict = apicMsrAccessError(pVCpu, u32Reg, APICMSRACCESS_READ_RSVD_OR_UNKNOWN);
+                break;
+            }
+
             /* Reserved MSRs: */
             case MSR_IA32_X2APIC_LVT_CMCI: