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From: George Dunlap <George.Dunlap@eu.citrix.com>
To: Juergen Gross <jgross@suse.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>,
	Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
	Wei Liu <wei.liu2@citrix.com>, Chunyan Liu <cyliu@suse.com>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [PATCH 2/3] libxl: add domain config parameter to force start of qemu
Date: Thu, 17 Mar 2016 16:06:21 +0000	[thread overview]
Message-ID: <CAFLBxZb2SEBjEuMb2-U6_5NJ8UcCaXhSQkvULc6Fu5x9aQCu6w@mail.gmail.com> (raw)
In-Reply-To: <1457622051-30189-3-git-send-email-jgross@suse.com>

On Thu, Mar 10, 2016 at 3:00 PM, Juergen Gross <jgross@suse.com> wrote:
> Today the device model (qemu) is started for a pv domain only in case
> a device requiring qemu is specified in the domain configuration
> (qdisk, vfb, channel). If there is no such device the device model
> isn't started and hence it is possible to add such a device to the
> domain later.
>
> Add a domain configuration parameter to specify the device model is
> to be started in any case. This will enable adding devices with a
> qemu based backend later.
>
> While the optimal solution would be to start the device model
> automatically when needed this would require some major rework of
> libxl at multiple places.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>

So wait -- what happens now if you try to attach a disk with a qdisk
backend to a PV guest that didn't start with qemu running?

I'd really like to see patch 3 get in, but I'm not really in favor of
this sort of a user-visible hack, particularly as we have to support
it in libxl more or less indefinitely.

 -George

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  reply	other threads:[~2016-03-17 16:06 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-10 15:00 [PATCH 0/3] libxl: add support for qemu base pvusb backend Juergen Gross
2016-03-10 15:00 ` [PATCH 1/3] libxl: make libxl__need_xenpv_qemu() operate on domain config Juergen Gross
2016-03-17 16:53   ` George Dunlap
2016-03-18  8:23     ` Juergen Gross
2016-03-10 15:00 ` [PATCH 2/3] libxl: add domain config parameter to force start of qemu Juergen Gross
2016-03-17 16:06   ` George Dunlap [this message]
2016-03-18  8:11     ` Juergen Gross
2016-03-21 14:28       ` George Dunlap
2016-03-21 14:44         ` Juergen Gross
2016-03-10 15:00 ` [PATCH 3/3] libxl: add new pvusb backend "qusb" provided by qemu Juergen Gross
2016-03-17 16:39   ` George Dunlap
2016-03-18  8:22     ` Juergen Gross
2016-03-17 16:55   ` George Dunlap
2016-03-18  8:24     ` Juergen Gross
2016-03-24 20:07       ` Wei Liu
2016-03-25  6:09         ` Juergen Gross
2016-03-29  9:45           ` George Dunlap
2016-03-29 10:35             ` Juergen Gross
2016-03-30  4:43               ` Juergen Gross

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