On Tue, Apr 19, 2022 at 11:46:59AM +0200, Gerd Hoffmann wrote:
> > > diff --git a/src/fw/mptable.c b/src/fw/mptable.c
> > > index 47385cc..3a7b02f 100644
> > > --- a/src/fw/mptable.c
> > > +++ b/src/fw/mptable.c
> > 
> > If you look at the top of that file you'll see the notice:
> > 
> > // DO NOT ADD NEW FEATURES HERE.  (See paravirt.c / biostables.c instead.)
> > 
> > The mptable.c file in seabios is no longer modified.  If a guest OS
> > needs a different mptable then it will be necessary to extend qemu to
> > pass the desired mptable to seabios (as is done for smbios and acpi).
> 
> Maybe its time to think about removing this code?  Current state of
> affairs in qemu is:
> 
> # qemu-default -M help
> Supported machines are:
> [ ... ]
> pc-i440fx-2.1        Standard PC (i440FX + PIIX, 1996)
> pc-i440fx-2.0        Standard PC (i440FX + PIIX, 1996)
> pc-i440fx-1.7        Standard PC (i440FX + PIIX, 1996) (deprecated)
> pc-i440fx-1.6        Standard PC (i440FX + PIIX, 1996) (deprecated)
> pc-i440fx-1.5        Standard PC (i440FX + PIIX, 1996) (deprecated)
> pc-i440fx-1.4        Standard PC (i440FX + PIIX, 1996) (deprecated)
> [ ... ]
> 
> So qemu plans to remove support for machine types 1.7 and older, this
> will probably happen later this year in the 7.1 or 7.2 release.
> 
> qemu added support for passing acpi tables to the firmware in version
> 1.7, so the compatibility code is only used for machine types 1.6 and
> older.
> 
> So in a year or so the only purpose the compatibility code will serve
> is confusing people ...

I know qemu produces the acpi and smbios tables.  I wasn't aware it
will currently pass in the mptable to seabios.  (Nor the PIR table.)

I'm okay with removing support from seabios.  As a first step we can
change the Kconfig defaults to not produce the tables.

-Kevin
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