linux-kernel - Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via initrd

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Message-Id: <201203240226.35314.trenn@suse.de>
Date:	Sat, 24 Mar 2012 02:26:34 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	eric.piel@...mplin-utc.net, vojcek@...n.pl, dsdt@...gusch.at,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, Lin Ming <ming.m.lin@...el.com>, lenb@...nel.org,
	robert.moore@...el.com, hpa@...or.com
Subject: Re: [PATCH] ACPI: Implement overriding of arbitrary ACPI tables via initrd

On Friday 23 March 2012 21:54:12 Yinghai Lu wrote:
> On Fri, Mar 23, 2012 at 7:29 AM, Thomas Renninger <trenn@...e.de> wrote:
...
 
> great. that is very good feature for development and debug.
Thanks.
...

> > +       int table_nr = 0;
> > +       *table_length = 0;
> > +       *address = 0;
> > +       for (; table_nr < ACPI_OVERRIDE_TABLES &&
> > +                    acpi_table_override_offset[table_nr]; table_nr++) {
> > +               int table_offset;
> > +               int table_len;
> > +               struct acpi_table_header *table;
> > +
> > +               if (table_nr == 0)
> > +                       table_offset = 0;
> > +               else
> > +                       table_offset = acpi_table_override_offset[table_nr - 1];
> >
> > +               table_len = acpi_table_override_offset[table_nr] - table_offset;
> > +
> > +               table = acpi_os_map_memory(acpi_tables_inram + table_offset,
> > +                                          table_len);
> > +
> 
> maybe could have dmi checking for more strict checking.
I do not understand what should get checked?
Hm, I guess you mean if a general table is always added that is distributed
on different platforms and you want to white/blacklist machines to
explicitly load/not load the table?
This must not happen.
The tables are always platform specific and you provide tables for
a specific machine only for debugging purposes.

> also would help if have one boot command that could skip overriding.
Same. Both should not be needed.

Or you have a use-case in mind I cannot not think of...

   Thomas
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