linux-kernel - Re: [PATCH] ACPI: APEI: Check NULL argument in exported symbol

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Date:   Fri, 24 Sep 2021 15:25:03 +0000
From:   Vasyl Gomonovych <vgomonovych@...vell.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     "rafael@...nel.org" <rafael@...nel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "james.morse@....com" <james.morse@....com>,
        Tony Luck <tony.luck@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Robert Richter <rrichter@....com>,
        Tom Saeger <tom.saeger@...cle.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI: APEI: Check NULL argument in exported symbol

> Looking at this more, that apei_hest_parse() thng should be made static and the export dropped.
I found  apei_hest_parse() useful API to access the HEST table.
I think RAS development should increase the number of users of apei_hest_parse().
With this API we can read HEST and modify it.
Read example is to get a count of errors sources from HEST tables from the external driver and use that counter for driver data allocation.
One of write example is to patch error_status_address, if firmware change 
memory layout based on boot conditions, error_status_address from hest.asl can require shift which can be recognized by driver.
Currently my RAS development underway and I recognize that legal and open way to touch HEST table is 
via apei_hest_parse() from external driver. 
Abstraction layer between driver main purposes and setup procedure HEST access utilize mainly apei_hest_parse(). 
From  this perspective apei_hest_parse() become central function in access abstraction. 
That is why I thought to make this check. But of course user should be responsible for own way of access.