linux-hardening - RE: [PATCH V2] ACPI: APEI: Use ERST timeout for slow devices

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Date:   Sat, 5 Aug 2023 01:04:41 +0000
From:   Jeshua Smith <jeshuas@...dia.com>
To:     "Luck, Tony" <tony.luck@...el.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "gpiccoli@...lia.com" <gpiccoli@...lia.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "james.morse@....com" <james.morse@....com>,
        "bp@...en8.de" <bp@...en8.de>
CC:     "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Subject: RE: [PATCH V2] ACPI: APEI: Use ERST timeout for slow devices

Thanks for the reply.

It's not very easy to see. It's just a bit down from the link you sent. It's the last possible action in the Serialization Actions table:
https://uefi.org/specs/ACPI/6.5/18_Platform_Error_Interfaces.html#serialization-actions

18.5.1.1. Serialization Actions

GET_EXECUTE-_OPERATION_TIMINGS

Returns an encoded QWORD:
[63:32] value in microseconds that the platform expects would be the maximum amount of time it will take to process and complete an EXECUTE_OPERATION.
[31:0] value in microseconds that the platform expects would be the nominal amount of time it will take to process and complete an EXECUTE_OPERATION.

-----Original Message-----
From: Luck, Tony <tony.luck@...el.com> 
Sent: Friday, August 4, 2023 10:31 AM
To: Jeshua Smith <jeshuas@...dia.com>; keescook@...omium.org; gpiccoli@...lia.com; rafael@...nel.org; lenb@...nel.org; james.morse@....com; bp@...en8.de
Cc: linux-acpi@...r.kernel.org; linux-kernel@...r.kernel.org; linux-hardening@...r.kernel.org; linux-tegra@...r.kernel.org; Thierry Reding <treding@...dia.com>; Jonathan Hunter <jonathanh@...dia.com>
Subject: RE: [PATCH V2] ACPI: APEI: Use ERST timeout for slow devices

External email: Use caution opening links or attachments

> Can the maintainers please respond to my patch?

Can you give a reference to the ACPI spec where this timing information is documented? I'm looking at ACPI 6.5 and don't see anything about this.

https://uefi.org/specs/ACPI/6.5/18_Platform_Error_Interfaces.html#error-serialization

-Tony