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Re: [PATCH] ARM: Drop ThumbEE support
- To: Hans van Kranenburg <hans@xxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 3 Dec 2025 17:49:30 +0000
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- Cc: andrew.cooper3@xxxxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Maximilian Engelhardt <maxi@xxxxxxxxxxxxx>
- Delivery-date: Wed, 03 Dec 2025 17:49:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03/12/2025 5:47 pm, Hans van Kranenburg wrote:
> Hi Andrew,
>
> On 12/3/25 6:16 PM, Andrew Cooper wrote:
>> It was reported that Xen no longer builds on Debian Trixie:
> The FTBFS is on Debian *unstable/sid*.
>
> The build on Debian 13 Trixie is OK.
Ah ok. I can tweak that.
>
>> Assembler messages:
>> {standard input}:474: Error: unknown or missing system register name at
>> operand 1 -- `msr TEECR32_EL1,x0'
>> {standard input}:480: Error: unknown or missing system register name at
>> operand 1 -- `msr TEEHBR32_EL1,x0'
>> {standard input}:488: Error: unknown or missing system register name at
>> operand 2 -- `mrs x0,TEECR32_EL1'
>> {standard input}:494: Error: unknown or missing system register name at
>> operand 2 -- `mrs x0,TEEHBR32_EL1'
>> make[5]: *** [Rules.mk:249: arch/arm/domain.o] Error 1
>>
>> This turns out to be an intentional change in bintuils. ThumbEE was dropped
>> from the architecture and doesn't exist in v8 (i.e. AArch64).
>>
>> Xen supports v7+virt extentions so in principle we could #ifdef CONFIG_ARM_32
>> to keep it working, but there was apparently no use of ThumbEE outside of
>> demo
>> code, so simply drop it.
>>
>> Reported-by: Hans van Kranenburg <hans@xxxxxxxxxxx>
> Thanks!
>
> I have just applied the patch here and have now successfully built the
> Debian Xen packages using Debian unstable/sid build chroot on the arm64
> Debian VM that I have here on my work macbook.
Assuming that the maintainers are happy, can I translate this into a
Tested-by tag?
~Andrew
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