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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: Wed, 10 Dec 2025 15:57:05 +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: Wed, 10 Dec 2025 15:58:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-index: AQHcaPf50ZeGSKmclk2/0HK7x9tq5LUbCS+A
- Thread-topic: [PATCH] xen/arm: Set ThumbEE as not present in PFR0
Hi Bertrand,
> 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>
> ---
> xen/arch/arm/cpufeature.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/xen/arch/arm/cpufeature.c b/xen/arch/arm/cpufeature.c
> index 1a80738571e3..4cde208e721a 100644
> --- a/xen/arch/arm/cpufeature.c
> +++ b/xen/arch/arm/cpufeature.c
> @@ -225,6 +225,7 @@ static int __init create_domain_cpuinfo(void)
> #ifdef CONFIG_ARM_64
> domain_cpuinfo.pfr64.amu = 0;
> #endif
> + domain_cpuinfo.pfr32.thumbee = 0;
> domain_cpuinfo.pfr32.amu = 0;
>
> /* Hide RAS support as Xen does not support it */
> --
> 2.51.2
>
>
This solves the issue I observed.
Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Tested-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Cheers,
Luca
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