EC2 ARM64 AMIs

[Colin Percival]

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Hi cloudy and army people,

With this commit it became possible to build EC2 ARM64 AMIs straight
out of a clean HEAD source tree:

# make TARGET=arm64 TARGET_ARCH=aarch64 buildworld buildkernel
# make -C release WITH_CLOUDWARE=YES AWSKEYFILE=... AWSREGION=...
AWSBUCKET=... TARGET=arm64 TARGET_ARCH=aarch64 ec2ami

If all goes well, gjb@ will be building these as part of the weekly
FreeBSD snapshots; but in case anyone doesn't want to wait for those
I've built a round of AMIs:

ap-northeast-1: ami-0acf717e884761a19
ap-northeast-2: ami-06d3076e861fa7993
ap-south-1: ami-034d652acc6b0f378
ap-southeast-1: ami-00e6244ba84b97b4a
ap-southeast-2: ami-0158b3ed5ffb72d63
ca-central-1: ami-0e57c2206fd35e008
eu-central-1: ami-084c50de545dc70b5
eu-north-1: ami-026634d6aff5e1ce2
eu-west-1: ami-09e7f14514dcf9d94
eu-west-2: ami-03224a0fa11ad5d60
eu-west-3: ami-0102b4b677e86aeb8
sa-east-1: ami-05051a63643cdcd17
us-east-1: ami-0ff7fa1d1acce3d38
us-east-2: ami-08475ffa7e3586891
us-west-1: ami-0de79ee79009d8a45
us-west-2: ami-074dde074e60ebf62

I hope to have this and related commits MFCed in time for the upcoming
FreeBSD 11.3-RELEASE.

Many thanks Greg V, who did most of the "heavy lifting" of figuring out
what was needed in order to get FreeBSD working on ARM64 EC2 instances.

Colin Percival

- -------- Forwarded Message --------
Subject: svn commit: r345858 - in head/release: . tools
Date: Wed, 3 Apr 2019 21:54:47 +0000 (UTC)
From: Colin Percival <cperciva at FreeBSD.org>
To: src-committers at freebsd.org, svn-src-all at freebsd.org,
svn-src-head at freebsd.org

Author: cperciva
Date: Wed Apr  3 21:54:47 2019
New Revision: 345858
URL: https://svnweb.freebsd.org/changeset/base/345858

Log:
  Add support for cross-building cloudware images.

  If MACHINE_ARCH doesn't match TARGET_ARCH, and we're not in the special
  case of building i386 images on an amd64 host, we need to pull in the
  qemu-user-static package; this allows us to run some commands inside
  the VM disk image chroot, most notably to install packages.

  Reviewed by:	gjb
  MFC after:	2 weeks
  Sponsored by:	FreeBSD/EC2 patreon (https://www.patreon.com/cperciva)

Modified:
  head/release/Makefile.vm
  head/release/tools/ec2.conf
  head/release/tools/vmimage.subr

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