The grub-pv stubdoms (32- and 64-bit) are disabled by default since
several years now.

Remove them in order to enable removing quite some more code from Xen.
In case someone is really depending on grub-pv, they can easily take it
from an older Xen build, as there is no Xen version dependency in
grub-pv (a version built 3 years ago has been tested to still work
with current 4.23 staging Xen).

Note that after this series has been committed, some additional
cleanup is possible by removing stubdom libpci and zlib support, but
this will require a modification of Mini-OS depending on these patches.

Juergen Gross (5):
  stubdom: remove support for grub-pv
  stubdom: remove support for building in 32-bit mode
  stubdom: remove building of libxenguest and libxenctrl
  docs: remove stale stubdom entries from stubdom.txt
  tools/libxenguest: remove Mini-OS specific parts

 Makefile                                      |    6 -
 config/Stubdom.mk.in                          |    3 -
 docs/misc/stubdom.txt                         |   69 -
 stubdom/.gitignore                            |    1 -
 stubdom/Makefile                              |   69 +-
 stubdom/configure                             |   65 -
 stubdom/configure.ac                          |    2 -
 stubdom/grub.patches/00cvs                    | 1022 -----
 stubdom/grub.patches/10graphics.diff          | 2297 -----------
 stubdom/grub.patches/11graphics-keyboard.diff |   13 -
 stubdom/grub.patches/20print_func.diff        |   52 -
 stubdom/grub.patches/30savedefault.diff       |  186 -
 .../grub.patches/40ext3_256byte_inode.diff    |  114 -
 stubdom/grub.patches/50fs_fulldisk.diff       |   72 -
 stubdom/grub.patches/60ext4.diff              |  474 ---
 stubdom/grub.patches/61btrfs.diff             | 3499 -----------------
 stubdom/grub.patches/70compiler_warnings.diff |   45 -
 stubdom/grub.patches/99minios                 | 1570 --------
 stubdom/grub/Makefile                         |   88 -
 stubdom/grub/boot-x86_32.S                    |  112 -
 stubdom/grub/boot-x86_64.S                    |  108 -
 stubdom/grub/config.h                         |   12 -
 stubdom/grub/kexec.c                          |  434 --
 stubdom/grub/mini-os.c                        |  771 ----
 stubdom/grub/mini-os.h                        |    7 -
 stubdom/grub/minios.cfg                       |    4 -
 stubdom/grub/osdep.h                          |   30 -
 tools/libs/guest/Makefile.common              |   15 -
 tools/libs/guest/xg_dom_decompress_unsafe.c   |   48 -
 tools/libs/guest/xg_dom_decompress_unsafe.h   |   28 -
 .../guest/xg_dom_decompress_unsafe_bzip2.c    |   14 -
 .../libs/guest/xg_dom_decompress_unsafe_lz4.c |   39 -
 .../guest/xg_dom_decompress_unsafe_lzma.c     |   14 -
 .../guest/xg_dom_decompress_unsafe_lzo1x.c    |   44 -
 .../libs/guest/xg_dom_decompress_unsafe_xz.c  |   46 -
 .../guest/xg_dom_decompress_unsafe_zstd.c     |   44 -
 36 files changed, 1 insertion(+), 11416 deletions(-)
 delete mode 100644 stubdom/grub.patches/00cvs
 delete mode 100644 stubdom/grub.patches/10graphics.diff
 delete mode 100644 stubdom/grub.patches/11graphics-keyboard.diff
 delete mode 100644 stubdom/grub.patches/20print_func.diff
 delete mode 100644 stubdom/grub.patches/30savedefault.diff
 delete mode 100644 stubdom/grub.patches/40ext3_256byte_inode.diff
 delete mode 100644 stubdom/grub.patches/50fs_fulldisk.diff
 delete mode 100644 stubdom/grub.patches/60ext4.diff
 delete mode 100644 stubdom/grub.patches/61btrfs.diff
 delete mode 100644 stubdom/grub.patches/70compiler_warnings.diff
 delete mode 100644 stubdom/grub.patches/99minios
 delete mode 100644 stubdom/grub/Makefile
 delete mode 100644 stubdom/grub/boot-x86_32.S
 delete mode 100644 stubdom/grub/boot-x86_64.S
 delete mode 100644 stubdom/grub/config.h
 delete mode 100644 stubdom/grub/kexec.c
 delete mode 100644 stubdom/grub/mini-os.c
 delete mode 100644 stubdom/grub/mini-os.h
 delete mode 100644 stubdom/grub/minios.cfg
 delete mode 100644 stubdom/grub/osdep.h
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe.c
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe.h
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe_bzip2.c
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe_lz4.c
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe_lzma.c
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe_lzo1x.c
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe_xz.c
 delete mode 100644 tools/libs/guest/xg_dom_decompress_unsafe_zstd.c

-- 
2.54.0

On 07.07.2026 10:34, Juergen Gross wrote:
> The grub-pv stubdoms (32- and 64-bit) are disabled by default since
> several years now.
> 
> Remove them in order to enable removing quite some more code from Xen.
> In case someone is really depending on grub-pv, they can easily take it
> from an older Xen build, as there is no Xen version dependency in
> grub-pv (a version built 3 years ago has been tested to still work
> with current 4.23 staging Xen).

What guarantees this to remain this way, when ...

> Juergen Gross (5):
>   stubdom: remove support for grub-pv
>   stubdom: remove support for building in 32-bit mode
>   stubdom: remove building of libxenguest and libxenctrl

... there was this dependency on (unstable) libraries?

Jan

On 07.07.26 10:39, Jan Beulich wrote:
> On 07.07.2026 10:34, Juergen Gross wrote:
>> The grub-pv stubdoms (32- and 64-bit) are disabled by default since
>> several years now.
>>
>> Remove them in order to enable removing quite some more code from Xen.
>> In case someone is really depending on grub-pv, they can easily take it
>> from an older Xen build, as there is no Xen version dependency in
>> grub-pv (a version built 3 years ago has been tested to still work
>> with current 4.23 staging Xen).
> 
> What guarantees this to remain this way, when ...
> 
>> Juergen Gross (5):
>>    stubdom: remove support for grub-pv
>>    stubdom: remove support for building in 32-bit mode
>>    stubdom: remove building of libxenguest and libxenctrl
> 
> ... there was this dependency on (unstable) libraries?

Only stable hypercalls are being used. Otherwise the domctl version
check would fail, right?

I did a review of the stubdom specific grub code and didn't spot any
use of an unstable hypercall, BTW.


Juergen

On 07.07.2026 10:44, Juergen Gross wrote:
> On 07.07.26 10:39, Jan Beulich wrote:
>> On 07.07.2026 10:34, Juergen Gross wrote:
>>> The grub-pv stubdoms (32- and 64-bit) are disabled by default since
>>> several years now.
>>>
>>> Remove them in order to enable removing quite some more code from Xen.
>>> In case someone is really depending on grub-pv, they can easily take it
>>> from an older Xen build, as there is no Xen version dependency in
>>> grub-pv (a version built 3 years ago has been tested to still work
>>> with current 4.23 staging Xen).
>>
>> What guarantees this to remain this way, when ...
>>
>>> Juergen Gross (5):
>>>    stubdom: remove support for grub-pv
>>>    stubdom: remove support for building in 32-bit mode
>>>    stubdom: remove building of libxenguest and libxenctrl
>>
>> ... there was this dependency on (unstable) libraries?
> 
> Only stable hypercalls are being used. Otherwise the domctl version
> check would fail, right?

Of course, but the libraries offer more than just wrappers around domctl.
Yet then ...

> I did a review of the stubdom specific grub code and didn't spot any
> use of an unstable hypercall, BTW.

... this is of course reassuring.

Jan