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Re: [PATCH] xen/arm: Set ThumbEE as not present in PFR0
- To: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Mon, 5 Jan 2026 09:15:17 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Mon, 05 Jan 2026 09:16:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH] xen/arm: Set ThumbEE as not present in PFR0
Hi all,
> On 9 Dec 2025, at 10:37, Bertrand Marquis <bertrand.marquis@xxxxxxx> wrote:
>
> Force ThumbEE support to not available in the version of the PFR0
> register value we present to guest.
> Xen does not support ThumbEE and will trap all access to ThumbEE
> registers so do not report it being supported if the hardware supports
> it.
>
> Fixes: 5bbe1fe413f9 ("ARM: Drop ThumbEE support")
> Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
> Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
> Tested-by: Luca Fancellu <luca.fancellu@xxxxxxx>
> ---
just a follow up on this one, the QEMU bug preventing PFR0 to be trapped at EL2
on
Arm v7a will be fixed when these pathes will be merged:
https://patchew.org/QEMU/20251231170858.254594-1-peter.maydell@xxxxxxxxxx/
Cheers,
Luca
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