diff mbox series

[v3] tests/migration: Add source to PC boot block

Message ID 20180212183415.5357-1-dgilbert@redhat.com
State New
Headers show
Series [v3] tests/migration: Add source to PC boot block | expand

Commit Message

Dr. David Alan Gilbert Feb. 12, 2018, 6:34 p.m. UTC 
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

The boot block used in the migration test is currently only
shipped as a hex (with the source in the git commit message),
change this to actually include the source.

A script is added to rebuild the header but the expectation is that
the generated hex is shipped as well as the .s, so that
there's no requirement to have just the right assembler etc.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 tests/migration-test.c                   | 48 +----------------
 tests/migration/rebuild-x86-bootblock.sh | 35 ++++++++++++
 tests/migration/x86-a-b-bootblock.h      | 51 ++++++++++++++++++
 tests/migration/x86-a-b-bootblock.s      | 92 ++++++++++++++++++++++++++++++++
 4 files changed, 180 insertions(+), 46 deletions(-)
 create mode 100755 tests/migration/rebuild-x86-bootblock.sh
 create mode 100644 tests/migration/x86-a-b-bootblock.h
 create mode 100644 tests/migration/x86-a-b-bootblock.s

Comments

Eric Blake Feb. 12, 2018, 8:21 p.m. UTC | #1 
On 02/12/2018 12:34 PM, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> 
> The boot block used in the migration test is currently only
> shipped as a hex (with the source in the git commit message),

Would be nice to point to commit ea0c6d62 (I assume that's the commit 
message you're referring to).

> change this to actually include the source.

Yeah, GPL really wants us to ship the preferred editing form of sources ;)

> 
> A script is added to rebuild the header but the expectation is that
> the generated hex is shipped as well as the .s, so that
> there's no requirement to have just the right assembler etc.
> 
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---

> +++ b/tests/migration-test.c
> @@ -80,57 +80,13 @@ static const char *tmpfs;
>   /* A simple PC boot sector that modifies memory (1-100MB) quickly
>    * outputing a 'B' every so often if it's still running.

Pre-existing, but while here,
s/outputing/outputting/

> diff --git a/tests/migration/rebuild-x86-bootblock.sh b/tests/migration/rebuild-x86-bootblock.sh
> new file mode 100755
> index 0000000000..ee9b53ceb4
> --- /dev/null
> +++ b/tests/migration/rebuild-x86-bootblock.sh
> @@ -0,0 +1,35 @@
> +#!/bin/sh
> +# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
> +# This work is licensed under the terms of the GNU GPL, version 2 or later.
> +# See the COPYING file in the top-level directory.
> +#
> +# Author: dgilbert@redhat.com
> +
> +ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
> +HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
> +
> +if [ ! -e "$ASMFILE" ]
> +then
> +  echo "Couldn't find $ASMFILE" >&2
> +  exit 1
> +fi
> +
> +ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XXXXX)
Portable use of mktemp requires at least 6 X, not 5.

> +cd $ASM_WORK_DIR &&

Unsafe if $PWD contains spaces; needs to be quoted.

> +as --32 -march=i486 "$ASMFILE" -o x86.o &&
> +objcopy -O binary x86.o x86.boot &&
> +dd if=x86.boot of=x86.bootsect \
> +  bs=256 count=2 skip=124 &&
> +xxd -i x86.bootsect |
> +sed -e 's/.*int.*//' > x86.hex &&
> +cat - x86.hex <<HERE > "$HEADER"
> +/* This file is automatically generated from
> + * tests/migration/x86-a-b-bootblock.s, edit that and then run
> + * tests/migration/rebuild-x86-bootblock.sh to update,
> + * and then remember to send both in your patch submission.
> + */
> +HERE
> +
> +rm x86.hex x86.bootsect x86.boot x86.o
> +cd .. && rmdir $ASM_WORK_DIR

Another place that needs quoting.

> +++ b/tests/migration/x86-a-b-bootblock.s
> @@ -0,0 +1,92 @@
> +# x86 bootblock used in migration test
> +#  repeatedly increments the first byte of each page in a 100MB
> +#  range.
> +#  Outputs an initial 'A' on serial followed by repeated 'B's
> +#
> +# run   tests/migration/rebuild-x86-bootblock.sh
> +#   to regenerate the hex, and remember to include both the .h and .s
> +#   in any patches.
> +#
> +# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates

Do you want to add 2018, since you've now modified things since the 
original commit?
Dr. David Alan Gilbert Feb. 13, 2018, 9:58 a.m. UTC | #2 
* Eric Blake (eblake@redhat.com) wrote:
> On 02/12/2018 12:34 PM, Dr. David Alan Gilbert (git) wrote:
> > From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> > 
> > The boot block used in the migration test is currently only
> > shipped as a hex (with the source in the git commit message),
> 
> Would be nice to point to commit ea0c6d62 (I assume that's the commit
> message you're referring to).

Done.

> > change this to actually include the source.
> 
> Yeah, GPL really wants us to ship the preferred editing form of sources ;)
> 
> > 
> > A script is added to rebuild the header but the expectation is that
> > the generated hex is shipped as well as the .s, so that
> > there's no requirement to have just the right assembler etc.
> > 
> > Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > ---
> 
> > +++ b/tests/migration-test.c
> > @@ -80,57 +80,13 @@ static const char *tmpfs;
> >   /* A simple PC boot sector that modifies memory (1-100MB) quickly
> >    * outputing a 'B' every so often if it's still running.
> 
> Pre-existing, but while here,
> s/outputing/outputting/

Extra 't'

> > diff --git a/tests/migration/rebuild-x86-bootblock.sh b/tests/migration/rebuild-x86-bootblock.sh
> > new file mode 100755
> > index 0000000000..ee9b53ceb4
> > --- /dev/null
> > +++ b/tests/migration/rebuild-x86-bootblock.sh
> > @@ -0,0 +1,35 @@
> > +#!/bin/sh
> > +# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
> > +# This work is licensed under the terms of the GNU GPL, version 2 or later.
> > +# See the COPYING file in the top-level directory.
> > +#
> > +# Author: dgilbert@redhat.com
> > +
> > +ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
> > +HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
> > +
> > +if [ ! -e "$ASMFILE" ]
> > +then
> > +  echo "Couldn't find $ASMFILE" >&2
> > +  exit 1
> > +fi
> > +
> > +ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XXXXX)
> Portable use of mktemp requires at least 6 X, not 5.

Extra 'X'

> > +cd $ASM_WORK_DIR &&
> 
> Unsafe if $PWD contains spaces; needs to be quoted.

Done.

> > +as --32 -march=i486 "$ASMFILE" -o x86.o &&
> > +objcopy -O binary x86.o x86.boot &&
> > +dd if=x86.boot of=x86.bootsect \
> > +  bs=256 count=2 skip=124 &&
> > +xxd -i x86.bootsect |
> > +sed -e 's/.*int.*//' > x86.hex &&
> > +cat - x86.hex <<HERE > "$HEADER"
> > +/* This file is automatically generated from
> > + * tests/migration/x86-a-b-bootblock.s, edit that and then run
> > + * tests/migration/rebuild-x86-bootblock.sh to update,
> > + * and then remember to send both in your patch submission.
> > + */
> > +HERE
> > +
> > +rm x86.hex x86.bootsect x86.boot x86.o
> > +cd .. && rmdir $ASM_WORK_DIR
> 
> Another place that needs quoting.

Done.

> > +++ b/tests/migration/x86-a-b-bootblock.s
> > @@ -0,0 +1,92 @@
> > +# x86 bootblock used in migration test
> > +#  repeatedly increments the first byte of each page in a 100MB
> > +#  range.
> > +#  Outputs an initial 'A' on serial followed by repeated 'B's
> > +#
> > +# run   tests/migration/rebuild-x86-bootblock.sh
> > +#   to regenerate the hex, and remember to include both the .h and .s
> > +#   in any patches.
> > +#
> > +# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
> 
> Do you want to add 2018, since you've now modified things since the original
> commit?

Done.

Dave

> -- 
> Eric Blake, Principal Software Engineer
> Red Hat, Inc.           +1-919-301-3266
> Virtualization:  qemu.org | libvirt.org
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
diff mbox series

Patch

diff --git a/tests/migration-test.c b/tests/migration-test.c
index c1ebbdf08f..8da0974b80 100644
--- a/tests/migration-test.c
+++ b/tests/migration-test.c
@@ -80,57 +80,13 @@  static const char *tmpfs;
 /* A simple PC boot sector that modifies memory (1-100MB) quickly
  * outputing a 'B' every so often if it's still running.
  */
-unsigned char bootsect[] = {
-  0xfa, 0x0f, 0x01, 0x16, 0x74, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
-  0x0f, 0x22, 0xc0, 0x66, 0xea, 0x20, 0x7c, 0x00, 0x00, 0x08, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe4, 0x92, 0x0c, 0x02,
-  0xe6, 0x92, 0xb8, 0x10, 0x00, 0x00, 0x00, 0x8e, 0xd8, 0x66, 0xb8, 0x41,
-  0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xb3, 0x00, 0xb8, 0x00, 0x00, 0x10,
-  0x00, 0xfe, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40,
-  0x06, 0x7c, 0xf2, 0xfe, 0xc3, 0x75, 0xe9, 0x66, 0xb8, 0x42, 0x00, 0x66,
-  0xba, 0xf8, 0x03, 0xee, 0xeb, 0xde, 0x66, 0x90, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00,
-  0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00, 0x27, 0x00, 0x5c, 0x7c,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
-};
+#include "tests/migration/x86-a-b-bootblock.h"
 
 static void init_bootfile_x86(const char *bootpath)
 {
     FILE *bootfile = fopen(bootpath, "wb");
 
-    g_assert_cmpint(fwrite(bootsect, 512, 1, bootfile), ==, 1);
+    g_assert_cmpint(fwrite(x86_bootsect, 512, 1, bootfile), ==, 1);
     fclose(bootfile);
 }
 
diff --git a/tests/migration/rebuild-x86-bootblock.sh b/tests/migration/rebuild-x86-bootblock.sh
new file mode 100755
index 0000000000..ee9b53ceb4
--- /dev/null
+++ b/tests/migration/rebuild-x86-bootblock.sh
@@ -0,0 +1,35 @@ 
+#!/bin/sh
+# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+#
+# Author: dgilbert@redhat.com
+
+ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
+HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
+
+if [ ! -e "$ASMFILE" ]
+then
+  echo "Couldn't find $ASMFILE" >&2
+  exit 1
+fi
+
+ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XXXXX)
+cd $ASM_WORK_DIR &&
+as --32 -march=i486 "$ASMFILE" -o x86.o &&
+objcopy -O binary x86.o x86.boot &&
+dd if=x86.boot of=x86.bootsect \
+  bs=256 count=2 skip=124 &&
+xxd -i x86.bootsect |
+sed -e 's/.*int.*//' > x86.hex &&
+cat - x86.hex <<HERE > "$HEADER"
+/* This file is automatically generated from
+ * tests/migration/x86-a-b-bootblock.s, edit that and then run
+ * tests/migration/rebuild-x86-bootblock.sh to update,
+ * and then remember to send both in your patch submission.
+ */
+HERE
+
+rm x86.hex x86.bootsect x86.boot x86.o
+cd .. && rmdir $ASM_WORK_DIR
+
diff --git a/tests/migration/x86-a-b-bootblock.h b/tests/migration/x86-a-b-bootblock.h
new file mode 100644
index 0000000000..78a151fe2a
--- /dev/null
+++ b/tests/migration/x86-a-b-bootblock.h
@@ -0,0 +1,51 @@ 
+/* This file is automatically generated from
+ * tests/migration/x86-a-b-bootblock.s, edit that and then run
+ * tests/migration/rebuild-x86-bootblock.sh to update,
+ * and then remember to send both in your patch submission.
+ */
+unsigned char x86_bootsect[] = {
+  0xfa, 0x0f, 0x01, 0x16, 0x74, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
+  0x0f, 0x22, 0xc0, 0x66, 0xea, 0x20, 0x7c, 0x00, 0x00, 0x08, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe4, 0x92, 0x0c, 0x02,
+  0xe6, 0x92, 0xb8, 0x10, 0x00, 0x00, 0x00, 0x8e, 0xd8, 0x66, 0xb8, 0x41,
+  0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xb3, 0x00, 0xb8, 0x00, 0x00, 0x10,
+  0x00, 0xfe, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40,
+  0x06, 0x7c, 0xf2, 0xfe, 0xc3, 0x75, 0xe9, 0x66, 0xb8, 0x42, 0x00, 0x66,
+  0xba, 0xf8, 0x03, 0xee, 0xeb, 0xde, 0x66, 0x90, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00,
+  0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00, 0x27, 0x00, 0x5c, 0x7c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
+};
+
diff --git a/tests/migration/x86-a-b-bootblock.s b/tests/migration/x86-a-b-bootblock.s
new file mode 100644
index 0000000000..b1642641a7
--- /dev/null
+++ b/tests/migration/x86-a-b-bootblock.s
@@ -0,0 +1,92 @@ 
+# x86 bootblock used in migration test
+#  repeatedly increments the first byte of each page in a 100MB
+#  range.
+#  Outputs an initial 'A' on serial followed by repeated 'B's
+#
+# run   tests/migration/rebuild-x86-bootblock.sh
+#   to regenerate the hex, and remember to include both the .h and .s
+#   in any patches.
+#
+# Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+#
+# Author: dgilbert@redhat.com
+
+
+.code16
+.org 0x7c00
+        .file   "fill.s"
+        .text
+        .globl  start
+        .type   start, @function
+start:             # at 0x7c00 ?
+        cli
+        lgdt gdtdesc
+        mov $1,%eax
+        mov %eax,%cr0  # Protected mode enable
+        data32 ljmp $8,$0x7c20
+
+.org 0x7c20
+.code32
+        # A20 enable - not sure I actually need this
+        inb $0x92,%al
+        or  $2,%al
+        outb %al, $0x92
+
+        # set up DS for the whole of RAM (needed on KVM)
+        mov $16,%eax
+        mov %eax,%ds
+
+        mov $65,%ax
+        mov $0x3f8,%dx
+        outb %al,%dx
+
+        # bl keeps a counter so we limit the output speed
+        mov $0, %bl
+mainloop:
+        # Start from 1MB
+        mov $(1024*1024),%eax
+innerloop:
+        incb (%eax)
+        add $4096,%eax
+        cmp $(100*1024*1024),%eax
+        jl innerloop
+
+        inc %bl
+        jnz mainloop
+
+        mov $66,%ax
+        mov $0x3f8,%dx
+        outb %al,%dx
+
+        jmp mainloop
+
+        # GDT magic from old (GPLv2)  Grub startup.S
+        .p2align        2       /* force 4-byte alignment */
+gdt:
+        .word   0, 0
+        .byte   0, 0, 0, 0
+
+        /* -- code segment --
+         * base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
+         * type = 32bit code execute/read, DPL = 0
+         */
+        .word   0xFFFF, 0
+        .byte   0, 0x9A, 0xCF, 0
+
+        /* -- data segment --
+         * base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
+         * type = 32 bit data read/write, DPL = 0
+         */
+        .word   0xFFFF, 0
+        .byte   0, 0x92, 0xCF, 0
+
+gdtdesc:
+        .word   0x27                    /* limit */
+        .long   gdt                     /* addr */
+
+/* I'm a bootable disk */
+.org 0x7dfe
+        .byte 0x55
+        .byte 0xAA