Re: [Xen-devel] [Qemu-devel] [PATCH] Do not emulate a floppy drive when -nodefaults

[Paolo Bonzini <pbonzini@xxxxxxxxxx>]

On 14/05/2015 14:02, Markus Armbruster wrote:
>   It should certainly be off for pc-q35-2.4 and newer.  Real Q35 boards
>   commonly don't have an FDC (depends on the Super I/O chip used).
> 
>   We may want to keep it off for pc-i440fx-2.4 and newer.  I doubt
>   there's a real i440FX without an FDC, but our virtual i440FX is quite
>   unlike a real one in other ways already.

That would break libvirt for people upgrading from 2.3 to 2.4.  So it's
more like pc-i440fx-3.0 and pc-q35-3.0.  Unless for q35 we decide to
break everything and retroactively nuke the controller.

(I'm still not sure why we have backwards-compatible machine types for q35).

Paolo

> * Create the FDC only if the option is "on".
> 
> * Optional: make -drive if=floppy,... auto-enable it
> 
>   I wouldn't bother doing the same for -global isa-fdc.driveA=... and
>   such.

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