VMMR3

Timestamp:

Jun 1, 2018 8:29:34 PM (7 years ago)

Author:

vboxsync

Message:

NEM/win: More MSR work. Document IA32_APIC_BASE issues (no X2APIC, ++). bugref:9044

File:

trunk/src/VBox/VMM/VMMR3/NEMR3Native-win.cpp

-              r72412
+              r72415
+ *
+ *
+ * - Need to figure out how to emulate X2APIC (AMD Ryzen), doesn't work with
+ *   debian 9.0/64.
+ * - The IA32_APIC_BASE register does not work right:
+ *
+ *      - Attempts by the guest to clear bit 11 (EN) are ignored, both the
+ *        guest and the VMM reads back the old value.
+ *
+ *      - Attempts to modify the base address (bits NN:12) seems to be ignored
+ *        in the same way.
+ *
+ *      - The VMM can modify both the base address as well as the the EN and
+ *        BSP bits, however this is useless if we cannot intercept the WRMSR.
+ *
+ *      - Attempts by the guest to set the EXTD bit (X2APIC) result in #GP(0),
+ *        while the VMM ends up with with ERROR_HV_INVALID_PARAMETER.  Seems
+ *        there is no way to support X2APIC.
+ *
+ *

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