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Re: [PATCH 0/3] target/arm: Complete ISS for MTE tag check fail


From: Andrey Konovalov
Subject: Re: [PATCH 0/3] target/arm: Complete ISS for MTE tag check fail
Date: Wed, 12 Aug 2020 20:02:52 +0200

On Wed, Aug 12, 2020 at 7:52 PM Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 8/12/20 10:38 AM, Andrey Konovalov wrote:
> > On Wed, Aug 12, 2020 at 7:19 PM Richard Henderson
> > <richard.henderson@linaro.org> wrote:
> >>
> >> As reported by Andrey, I was missing the complete ISS info for
> >> the Data Abort raised upon a synchronous tag check fail.
> >>
> >> The following should fix that.  All the twisty little rules for
> >> the ISS.ISV bit are already handled by merge_syn_data_abort.
> >> Probably the most important bit that was missing was ISS.WnR,
> >> as that is independent of ISS.ISV.
> >>
> >> Andrey, will you please test?
> >
> > Looks like WnR is now being set properly, but SAS is still always 0.
>
> Are you looking at ESR_EL1?
>
> On page D13-2992 of revision F.a:
>
> # ISV is 0 for all faults reported in ESR_EL1 or ESR_EL3.
>
> which means that ISS[23:14] are RES0, which includes SAS.

+more Arm and Google people

Is this known? Do we not get access size when MTE fault happens?



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