Changeset 77459 in vbox for trunk/src

Timestamp:

Feb 25, 2019 3:04:16 PM (6 years ago)

Author:

vboxsync

Message:

VMM/IEM: Nested VMX: bugref:9180 Clear IDT-vectoring information field when the VM-exit is not occurring during delivery of an event. Also clear the IDT-vectoring information field for triple-fault VM-exits.

File:

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

trunk/src/VBox/VMM/VMMAll/IEMAllCImplVmxInstr.cpp.h

@@ -2833 +2833 @@
 
     /*
+     * Clear IDT-vectoring information fields if the VM-exit was not triggered during delivery of an event.
+     * See Intel spec. 27.2.3 "Information for VM Exits During Event Delivery".
+     */
+    {
+        uint8_t    uVector;
+        uint32_t   fFlags;
+        uint32_t   uErrCode;
+        bool const fInEventDelivery = IEMGetCurrentXcpt(pVCpu, &uVector, &fFlags,  &uErrCode, NULL /* uCr2 */);
+        if (!fInEventDelivery)
+            iemVmxVmcsSetIdtVectoringInfo(pVCpu, 0);
+        /* else: Caller would have updated IDT-vectoring information already, see iemVmxVmexitEvent(). */
+    }
+
+    /*
      * Save the guest state back into the VMCS.
      * We only need to save the state when the VM-entry was successful.
@@ -4144 +4158 @@
 IEM_STATIC VBOXSTRICTRC iemVmxVmexitTripleFault(PVMCPU pVCpu)
 {
+    /*
+     * A VM-exit is not considered to occur during event delivery when the original
+     * event results in a triple-fault.
+     *
+     * Therefore, we must clear the original event from the IDT-vectoring fields which
+     * would've been recorded before causing the VM-exit.
+     *
+     * 27.2.3 "Information for VM Exits During Event Delivery"
+     */
+    iemVmxVmcsSetIdtVectoringInfo(pVCpu, 0);
+    iemVmxVmcsSetIdtVectoringErrCode(pVCpu, 0);
+
     return iemVmxVmexit(pVCpu, VMX_EXIT_TRIPLE_FAULT);
 }