linux-kernel - Re: [PATCH v6] arm64: sdei: abort running SDEI handlers during crash

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Message-ID: <9830b94a-da88-48f2-6fcd-da46b2e2ed0a@oracle.com>
Date:   Thu, 20 Jul 2023 12:43:35 +0300
From:   Mihai Carabas <mihai.carabas@...cle.com>
To:     scott@...amperecomputing.com
Cc:     catalin.marinas@....com, darren@...amperecomputing.com,
        james.morse@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, will@...nel.org
Subject: Re: [PATCH v6] arm64: sdei: abort running SDEI handlers during crash

 > Interrupts are blocked in SDEI context, per the SDEI spec: "The client
 > interrupts cannot preempt the event handler." If we crashed in the SDEI
 > handler-running context (as with ACPI's AGDI) then we need to clean 
up the
 > SDEI state before proceeding to the crash kernel so that the crash kernel
 > can have working interrupts.
 >
 > Track the active SDEI handler per-cpu so that we can COMPLETE_AND_RESUME
 > the handler, discarding the interrupted context.

 > Fixes: f5df26961853 ("arm64: kernel: Add arch-specific SDEI entry 
code and CPU masking")
 > Signed-off-by: D Scott Phillips <scott@...amperecomputing.com>

We have tested successfully this patch on Altra and AmpereOne.

Tested-by: Mihai Carabas <mihai.carabas@...cle.com>