Re: [Qemu-devel] [PATCH 2/5] exec: qemu_ram_alloc_device, qemu_ram_resize

[Paolo Bonzini <pbonzini@redhat.com>]

On 19/11/2014 15:13, Dr. David Alan Gilbert wrote:
> Since we've wondered off the actual ACPI table stuff into general
> ROM sizing, I'd like to propose some concrete fixes:
> 
>   1) We explicitly name the bios file in a .romfile attribute for
>      all ROMs.
>   2) The code that uses .romfile has an expansion for $MACHINETYPE
>   3) We actually symlink all of those together, anyone who wants/has
>      to deal with different versions can downstream.
>   4) The machine types contain size attributes for the ROMs that
>      are generoously larger than the ROMs anyone currently uses.
> 
> I think 1..3 should deal with those of us who have to deal with different
> ROM versions on different machine types.

It should, but it's a solution in search of a problem.

> 4 might be good enough for the ACPI tables if you can bound it.

Already doing that (rounding to 128k, warning if >64k), but it is not a
definitive solution.

We also do (4) for ROMs, since VGA BIOSes use only 36k out of 64k and
iPXE ROMs use only ~200k out of 256k.

Paolo