Re: [Xen-devel] 4.7 qemu regression: HVM guests fail to boot from xvda

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

George Dunlap writes ("Re: [Xen-devel] 4.7 qemu regression: HVM guests fail to 
boot from xvda"):
> On 03/06/16 12:45, Ian Jackson wrote:
> > Secondly, the proposal above involves changing both the semantics of
> > existing `hdtype' parameter values, and the default hdtype value.  The
> > resulting situation would be that even specifying vdev=hda wouldn't
> > get you an emulated device, by default, unless you specified `hdtype'
> > too.  I don't think that is right.
> 
> I don't quite understand this.
> 
> First of all, if I make a disk with "vdev=xvda,hdtype=ide", what
> happens?  I presume that the 'hdtype' field is effectively ignored?

hdtype is not a field in the disk specification.  It is a global
config option specifying what kind of emulated controller to have.

It affects all disks for which the code determines that an emulated
disk should be provided, but does not affect pv-only disks.

It defaults to `ide'.

Ian.

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