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

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Date:	Mon, 5 Jul 2010 12:58:52 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Don Dutile <ddutile@...hat.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>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.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

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.

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