Changeset 83372 in vbox for trunk/src/VBox/VMM/VMMR3

Timestamp:

Mar 23, 2020 2:52:24 PM (5 years ago)

Author:

vboxsync

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

136577

Message:

GIM/KVM: Update system-time struct on demand. Fixes guests that rely on the struct being frequently updated, e.g. SLES 10 SP4 (see bugref:7270).

File:

• trunk/src/VBox/VMM/VMMR3/GIMKvm.cpp (modified) (1 diff)

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

@@ -416 +416 @@
 
     /*
-     * Update guest memory with the system-time struct.
+     * Update guest memory with the system-time struct. Technically we are cheating
+     * by only writing the struct once with the version incremented by two; in reality,
+     * the system-time struct is enabled once by the boot CPU and not concurrently read
+     * by other VCPUs at the same time.
      */
     Assert(!(SystemTime.u32Version & UINT32_C(1)));