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[Xen-devel] Re: [PATCH 3/3] xen-blkfront: Fix minor offset calculation f

To: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 3/3] xen-blkfront: Fix minor offset calculation for emulated IDE disks
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Fri, 15 Jul 2011 11:20:26 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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On Fri, 15 Jul 2011, Stefan Bader wrote:
> On 14.07.2011 19:34, Stefano Stabellini wrote:
> > On Thu, 14 Jul 2011, Stefan Bader wrote:
> >> Before this a block device defined as hda1 in the configuration files
> >> would be mapped to hda, as well as hda2.
> >>
> > 
> > Don't you mean xvda and xvda2?
> > 
> Bah, yes, you are right. I had a "hda1" in a PVM guests definition and within
> the guest it had become "xvda". Basically it seems that the current code would
> map any minor number between 0-63 to 0.

That would be correct because hda1 is not allowed, the closest thing to
a valid configuration would be hda and therefore xvda.

> > Besides hda1 doesn't mean anything for an HVM guest, it is not an
> > allowed disk configuration.
> > It is also a bug in the toolstack that propagates such nonsense to
> > xenstore so I would rather fix xend and/or libxenlight.
> >
> Which seems actually to be something that could be intentional for HVM guests.
> As you say, "hdaX" does make no sense there... Unfortunately this is shared 
> for
> PVM and HVM. So my change may make sense with the first but not the latter... 
> :(

I see. The source of the problem is ancient disk configuration lines in
PV config files: like Ian wrote before, people should be using xvd* only
in PV guests config file, rather than hd* or sd*...
I think the best thing to do here would be to catch the error at the
toolstack level.

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