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Re: [PATCH for-4.22] xen/x86: Always strip xen.efi
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 9 Jun 2026 17:56:10 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, "Daniel P . Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 09 Jun 2026 16:56:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08/06/2026 9:01 pm, Marek Marczykowski-Górecki wrote:
> On Mon, Jun 08, 2026 at 06:31:08PM +0100, Andrew Cooper wrote:
>> From: Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
>>
>> xen.efi with debugging symbols is ~45MB, down to ~9.3MB when stripped.
>> Multiple firmwares (as seen by QubesOS, Trenchboot, and XenServer) are unable
>> to boot xen.efi when debugging symbols are included.
>>
>> Either way, having debug symbols by default is abnormal and contrary to how
>> the non-EFI path works.
>>
>> Produce xen-syms.efi unconditionally, just like xen-syms. If
>> CONFIG_DEBUG_INFO is enabled, these will contain debug symbols, and if not,
>> then not. When xen-syms is processed by mkelf32, the debug symbols are
>> simply
>> discarded. For xen-syms.efi, call $(STRIP) to produce xen.efi.
>>
>> Some old versions of binutils ld managed to produce efi files which the
>> matching version of strip couldn't process. This includes Binutils 2.26
>> included in Ubuntu 16.04. Delete the workaround for this bug, and require a
>> less broken toolchain.
> While I see Ubuntu 16.04 dropped, how is the "require a less broken
> toolchain" addressed? By implicitly disabling xen.efi build on broken
> toolchain? Maybe README should have a note about needing newer Binutils
> for xen.efi? Currently it says just Binutils 2.25. There is a section
> about optional build deps, maybe add there something like "GNU Binutils
> X.Y (required for building xen.efi)", if the version is known, or at
> least "GNU Binutils capable of producing non-broken PE files (required
> for building xen.efi)" if the version is not known.
xen.efi has never had any relation to the README minimum toolchain version.
It has always probed the toolchain, and silently turned itself off it
doesn't like the result. In this case, we drop one of the "lets work
around this bug different" checks which ends up excluding the problem
revision.
If you prefer, I could re-split the patch, and state on the first patch
that it's a prerequisite to be able to use $(STRIP) in the second patch ?
binutils' PE+ support is horribly buggy and Xen is the only user in this
area. At some point, 2.46 (practically bleeding edge) is going to be
required, seeing as it's the first version of bintuils where we don't
need to hexedit the PE+ header in order to satisfy the signing process.
~Andrew
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