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Re: [Xen-devel] [PATCH]: Remove special case for mixed hvm/pv disks whic

from [Ian Jackson]

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To:	Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH]: Remove special case for mixed hvm/pv disks which may prevent boot
From:	Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Date:	Fri, 23 Jul 2010 18:07:55 +0100
Cc:	Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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Gianni Tedesco writes ("[Xen-devel] [PATCH]: Remove special case for mixed 
hvm/pv disks which may prevent boot"):
> If a pv-on-hvm guest is configured with hard-disk virtpath=xvda and
> emulated cdrom virtpath=hdc then all xvda disks are ignored and the
> system is rendered un-bootable. Remove this special case in qemu and
> simply provide an emulated equivalent of all devices and let guest
> unplug what it wants.

HVM guest configs are supposed to specify hda= if they want the
devices to appear as emulated IDE devices.  The code you're patching
is a special compatibility hack to allow for the case where the guest
config file mentions _only_ xvda devices; it remaps them to hda on the
assumption that the person writing the config file didn't intend to
provide no emulated versions of those devices.

So I don't think this change is right ...

Ian.

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