Changeset 63907 in vbox

Timestamp:

Sep 20, 2016 9:28:39 AM (8 years ago)

Author:

vboxsync

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

110785

Message:

VMM/APIC: Comments.

File:

trunk/src/VBox/VMM/VMMR3/APIC.cpp

-              r63888
+              r63907
 /**
  * Sets whether Hyper-V compatibility mode (MSR interface) is enabled or not.
+ *
+ * This mode is a hybrid of xAPIC and x2APIC modes, some caveats:
+ * 1. MSRs are used even ones that are missing (illegal) in x2APIC like DFR.
+ * 2. A single ICR is used by the guest to send IPIs rather than 2 ICR writes.
+ * 3. It is unclear what the behaviour will be when invalid bits are set,
+ *    currently we follow x2APIC behaviour of causing a \#GP.
+ *
  * @param   pVM                 The cross context VM structure.

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