[src/trunk]: src/sys/arch/amd64/conf amd64/conf/XEN3_DOM0: Add comment

[gdt <gdt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8ce144a03635
branches:  trunk
changeset: 1019191:8ce144a03635
user:      gdt <gdt%NetBSD.org@localhost>
date:      Mon Mar 01 13:52:50 2021 +0000

description:
amd64/conf/XEN3_DOM0: Add comment

This commit merely adds a comment explaining how XEN3_DOM0 ought to
relate to GENERIC.

diffstat:

 sys/arch/amd64/conf/XEN3_DOM0 |  14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r 5907bf791f95 -r 8ce144a03635 sys/arch/amd64/conf/XEN3_DOM0
--- a/sys/arch/amd64/conf/XEN3_DOM0     Mon Mar 01 11:37:31 2021 +0000
+++ b/sys/arch/amd64/conf/XEN3_DOM0     Mon Mar 01 13:52:50 2021 +0000
@@ -1,4 +1,14 @@
-# $NetBSD: XEN3_DOM0,v 1.186 2021/01/20 13:22:08 nia Exp $
+# $NetBSD: XEN3_DOM0,v 1.187 2021/03/01 13:52:50 gdt Exp $
+
+# XEN3_DOM0 machine description file
+#
+# This machine description file is used to generate a kernel to be
+# used as a PV dom0 under Xen.  It is similar to GENERIC in that it is
+# intended to be useful for most applications.  Generally, besides
+# changes that are specifically required for Xen (e.g., XENPV), it
+# should be similar to GENERIC.  Some differences are currently
+# necessary, such as drivers that fail under Xen but work in GENERIC,
+# for reasons that do not follow from Xen architecture.
 
 include        "arch/amd64/conf/std.xen"
 
@@ -12,7 +22,7 @@
 #options       UVMHIST_PRINT
 #options       SYSCALL_DEBUG
 
-#ident         "XEN3_DOM0-$Revision: 1.186 $"
+#ident         "XEN3_DOM0-$Revision: 1.187 $"
 
 maxusers       32              # estimated number of users