Re: [PATCH v12 6/7] arm64: mte: Save/Restore TFSR_EL1 during suspend
From: Vincenzo Frascino <vincenzo.frascino@arm.com>
Date: 2021-02-09 19:58:57
Also in:
lkml
On 2/9/21 5:28 PM, Catalin Marinas wrote:
quoted
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel