linux-kernel - Re: [PATCH 12/13] Unplug emulated disks and nics

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Date:	Wed, 07 Jul 2010 16:01:31 -0400
From:	Don Dutile <ddutile@...hat.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"stefano@...bellini.net" <stefano@...bellini.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"sheng@...ux.intel.com" <sheng@...ux.intel.com>,
	"jeremy@...p.org" <jeremy@...p.org>
Subject: Re: [PATCH 12/13] Unplug emulated disks and nics

Stefano Stabellini wrote:
> On Thu, 1 Jul 2010, Don Dutile wrote:
>> The problem with this check/enable is that if you run
>> this on an older qemu-xen that doesn't have unplug support,
>> it fails pv-hvm configuration.
>>
>> But, all that means is that you can't use an xvd as the boot device,
>> and you have to use an emulated IDE device as boot device.
>> There are a couple ways to configure the vnif correctly (in guest
>> or in xen guest config file).
>>
>> So, on an older (say, rhel5) xen, I don't have this check;
>> the boot device is required to be spec'd as hda, not vda, and
>> xen-blkfront is not allowed to configure blk major nums
>> for IDE (& SCSI) (to avoid 2 drivers twiddling w/same phys backend... not good!).
>>
> 
> Who is requiring that the boot device is spec'd as hda and not xvda?
> I don't think there is such limitation in xend or libxl at the moment.
> 

If you take a previous xen HVM guest spec & just run it on a guest
that has pv-hvm added to it, then one has hda spec'd as boot device (by default,
by not editing the guest config spec/file).

Ideally, both config specs should/would work.

- Don

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