svn commit: r249493 - projects/bhyve_svm/sys/amd64/vmm/amd

[Neel Natu]

Author: neel
Date: Mon Apr 15 04:16:12 2013
New Revision: 249493
URL: http://svnweb.freebsd.org/changeset/base/249493

Log:
  Add a Cliff Notes version of the purpose and contents of the VMCB.
  
  Requested by:	julian

Modified:
  projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c

Modified: projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c
==============================================================================
--- projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c	Mon Apr 15 03:09:59 2013	(r249492)
+++ projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c	Mon Apr 15 04:16:12 2013	(r249493)
@@ -40,6 +40,16 @@ __FBSDID("$FreeBSD$");
 #include "vmcb.h"
 
 /*
+ * The VMCB aka Virtual Machine Control Block is a 4KB aligned page
+ * in memory that describes the virtual machine.
+ *
+ * The VMCB contains:
+ * - instructions or events in the guest to intercept
+ * - control bits that modify execution environment of the guest
+ * - guest processor state (e.g. general purpose registers)
+ */
+
+/*
  * Initialize SVM h/w context i.e. the VMCB control and saved state areas.
  */
 int