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

From: Stefan Weil
Subject: Re: [Qemu-devel] [PATCH] Do not emulate a floppy drive when -nodefaults
Date: Thu, 14 May 2015 06:38:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.6.0

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
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.


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