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

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 06/06/16 11:52, Ian Jackson wrote:
> 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'.

Oh, right; sorry I missed that.

/me goes back and re-reads IanJ's mail in that light

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