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

[Stefan Weil <sw@xxxxxxxxxxx>]

Am 13.05.2015 um 20:15 schrieb Stefano Stabellini:
> On Wed, 13 May 2015, Daniel P. Berrange wrote:
> > On Wed, May 13, 2015 at 06:29:46PM +0100, Stefano Stabellini wrote:
> > > Do not emulate a floppy drive if no drives are supposed to be present.
> > >
> > > This fixes the behavior of -nodefaults, that should remove the floppy
> > > drive (see docs/qdev-device-use.txt:Default Devices), but actually
> > > doesn't.
> > Technically that doc is just refering to the disablement of the
> > primary floppy drive, as opposed to the floppy controller. The
> > floppy controller itself is really a built-in device that is
> > defined as part of the machine type, along with the various other
> > platform devices hanging off the PIIX and ISA brige.
> I think you are right, this patch is a bit too harsh in fixing the
> problem: I just wanted to properly disable drive emulation, because from
> my tests the guest thinks that one drive is present even when is not.
A short test on some of my physical machines shows that most
of them don't have a floppy disk controller at all (dmesg | grep FDC).

Only some older machines still have one.

Therefore I think that QEMU must also be able to offer a virtual
machine without an FDC, maybe as the default for the next
version of QEMU.

Stefan


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