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Re: tst-arm-mte bug: PSTATE.TCO is cleared on exceptions
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From: |
Richard Henderson |
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Subject: |
Re: tst-arm-mte bug: PSTATE.TCO is cleared on exceptions |
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Date: |
Fri, 24 Apr 2020 12:47:46 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 |
On 4/21/20 9:39 PM, Richard Henderson wrote:
> On 4/20/20 3:29 AM, Szabolcs Nagy wrote:
>> i'm using the branch at
>>
>> https://github.com/rth7680/qemu/tree/tgt-arm-mte
>>
>> to test armv8.5-a mte and hope this is ok to report bugs here.
>>
>> i'm doing tests in qemu-system-aarch64 with linux userspace
>> code and it seems TCO bit gets cleared after syscalls or other
>> kernel entry, but PSTATE is expected to be restored, so i
>> suspect it is a qemu bug.
>>
>> i think the architecture saves/restores PSTATE using SPSR_ELx
>> on exceptions.
>
> Yep. I failed to update aarch64_pstate_valid_mask for TCO.
> Will fix. Thanks,
Fixed on the branch.
I still need to work out how best to plumb the arm,armv8.5-memtag property so
the devel/mte-v3 kernel branch isn't usable as-is for the moment. For myself,
I've just commented that test out for now.
r~