svn commit: r338321 - head/release/tools

[Colin Percival]

Author: cperciva
Date: Sun Aug 26 03:56:54 2018
New Revision: 338321
URL: https://svnweb.freebsd.org/changeset/base/338321

Log:
  Disable atkbd0 and atkdbc0 in EC2 AMIs.  This has the effect of skipping
  the probing and attaching of the PS/2 mouse (not present on EC2) and
  keyboard (emulated, but not accessible via EC2).
  
  Note that we disable atkbd0 separately even though during device probing
  it shows up as a child of atkbdc0; this is necessary because the device
  is also initialized during the early console setup from hammer_time.
  
  This change cuts the kernel boot time on an EC2 c5.4xlarge instance from
  7259ms down to 4727 ms.
  
  Approved by:	re (marius)

Modified:
  head/release/tools/ec2.conf

Modified: head/release/tools/ec2.conf
==============================================================================
--- head/release/tools/ec2.conf	Sun Aug 26 02:09:20 2018	(r338320)
+++ head/release/tools/ec2.conf	Sun Aug 26 03:56:54 2018	(r338321)
@@ -68,6 +68,13 @@ vm_extra_pre_umount() {
 	echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf
 	echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf
 
+	# The emulated keyboard attached to EC2 instances is inaccessible to
+	# users, and there is no mouse attached at all; disable to keyboard
+	# and the keyboard controller (to which the mouse would attach, if
+	# one existed) in order to save time in device probing.
+	echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
+	echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
+
 	# EC2 has two consoles: An emulated serial port ("system log"),
 	# which has been present since 2006; and a VGA console ("instance
 	# screenshot") which was introduced in 2016.