Changeset 49548 in vbox for trunk/src/VBox/Devices

Timestamp:

Nov 19, 2013 1:07:10 PM (11 years ago)

Author:

vboxsync

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

90738

Message:

DevAPIC: reverted r90537, r90540, r90551 -- actually we need to clear the CPUID bit if the APIC enable bit is unset

File:

• trunk/src/VBox/Devices/PC/DevAPIC.cpp (modified) (1 diff)

trunk/src/VBox/Devices/PC/DevAPIC.cpp

@@ -607 +607 @@
                 /* Clear any pending APIC interrupt action flag. */
                 apicCpuClearInterrupt(pDev, pApic);
+                /* See @bugref{7097}. Intel IA-32/64 Spec 10.4.3:
+                 * "When IA32_APIC_BASE[11] is 0, the processor is functionally equivalent to
+                 * an IA-32 processor without an on-chip APIC. The CPUID feature flag for the
+                 * APIC (see Section 10.4.2, 'Presence of the Local APIC') is also set to 0."
+                 */
+                pDev->CTX_SUFF(pApicHlp)->pfnChangeFeature(pDevIns, PDMAPICVERSION_NONE);
                 break;
             }