On 2/9/21 5:28 PM, Catalin Marinas wrote:
>> I don't think though you can "check" with IRQs disabled so I suspect
>> that TFSR_EL1 has to be saved/restored (which means that there is a
>> black out period where we run kernel code without being able to detect
>> faults but there is no solution to th
On Tue, Feb 09, 2021 at 02:33:28PM +, Lorenzo Pieralisi wrote:
> On Tue, Feb 09, 2021 at 11:55:33AM +, Catalin Marinas wrote:
> > On Mon, Feb 08, 2021 at 04:56:16PM +, Vincenzo Frascino wrote:
> > > When MTE async mode is enabled TFSR_EL1 contains the accumulative
> > > asynchronous tag
On 2/9/21 2:33 PM, Lorenzo Pieralisi wrote:
>> Do we need a similar fix for TFSRE0_EL1? We get away with this if
>> suspend is only entered on the idle (kernel) thread but I recall we
>> could also enter suspend on behalf of a user process (I may be wrong
>> though).
> Yes, when we suspend the m
On Tue, Feb 09, 2021 at 11:55:33AM +, Catalin Marinas wrote:
> On Mon, Feb 08, 2021 at 04:56:16PM +, Vincenzo Frascino wrote:
> > When MTE async mode is enabled TFSR_EL1 contains the accumulative
> > asynchronous tag check faults for EL1 and EL0.
> >
> > During the suspend/resume operation
On Mon, Feb 08, 2021 at 04:56:16PM +, Vincenzo Frascino wrote:
> When MTE async mode is enabled TFSR_EL1 contains the accumulative
> asynchronous tag check faults for EL1 and EL0.
>
> During the suspend/resume operations the firmware might perform some
> operations that could change the state
Hi Lorenzo,
thank you for your review.
On 2/8/21 6:56 PM, Lorenzo Pieralisi wrote:
>> u64 gcr_kernel_excl __ro_after_init;
>>
>> +static u64 mte_suspend_tfsr_el1;
> IIUC you need this per-CPU (core loses context on suspend-to-RAM but also
> CPUidle, S2R is single threaded but CPUidle runs on e
On Mon, Feb 08, 2021 at 04:56:16PM +, Vincenzo Frascino wrote:
> When MTE async mode is enabled TFSR_EL1 contains the accumulative
> asynchronous tag check faults for EL1 and EL0.
>
> During the suspend/resume operations the firmware might perform some
> operations that could change the state
When MTE async mode is enabled TFSR_EL1 contains the accumulative
asynchronous tag check faults for EL1 and EL0.
During the suspend/resume operations the firmware might perform some
operations that could change the state of the register resulting in
a spurious tag check fault report.
Save/restore
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