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 that other than delaying saving the >> value to just before calling into PSCI). Likewise on resume from low >> power. > It depends on whether kasan_report can be called with IRQs disabled. I > don't see why not, so if this works I'd rather just call mte_check_async > (or whatever it's called) on the suspend path and zero the register on > resume (mte_suspend_exit). We avoid any saving of the state.
Fine by me, I tried a quick test and can confirm that kasan_report can be invoked with IRQ disabled. -- Regards, Vincenzo