Re: [PATCH] target/arm: Disable SVE extensions when SVE is disabled

[Richard Henderson]

On 5/26/24 14:06, Marcin Juszkiewicz wrote:
> W dniu 26.05.2024 o 22:45, Richard Henderson pisze:
> > From: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
> >
> > Cc: qemu-stable@nongnu.org
> > Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2304
> > Reported-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
> > Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
>
> Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
>
> > ---
> >
> > Marcin added the correct patch to the issue 3 weeks ago, so I'm giving
> > him authorship here.  I only updated the comment a bit.
>
> I am not fully sure is it everything needed to be honest.
>
> Value 0x0000 in [3:0] means "The SVE instructions are implemented".
>
> The way why it works is probably because QEMU keeps "there is no SVE" information 
> separately and do not emulate them.

ID_AA64PFR0_EL1.SVE is the primary indicator for SVE.


r~