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

From: Richard Henderson
Subject: Re: [PATCH 0/3] target/arm: Complete ISS for MTE tag check fail
Date: Wed, 12 Aug 2020 10:52:03 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

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.


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