Re: [Xen-devel] [PATCH] hvc_xen: introduce HVC_XEN_FRONTEND

[Matt Wilson <msw@xxxxxxxxxx>]

On Tue, Mar 13, 2012 at 09:29:44AM -0700, Konrad Rzeszutek Wilk wrote:
> On Mon, Mar 05, 2012 at 10:45:33PM +0000, Stefano Stabellini wrote:
> > Only xen installations supporting vfb and qemu as a console backend are
> > susceptible, so Amazon should be safe because I don't think they use any
> > of them.
> 
> I think they use the normal xenconsole .. but then the patch to return 0
> would work .. but upset future version of QEMU (or is it the other way
> around).

There are HVM instance types in EC2: Cluster Compute (HPC cc1.*, cg1.*
and cc2.* instances) and all instances running Windows. When booting
Linux on a Cluster Compute instance you may see:

[    1.887398] XENBUS: Device with no driver: device/vfb/0
[    1.890850] XENBUS: Device with no driver: device/console/0

It's not safe to assume anything in regard to breaking compatibility
with older versions of Xen or QEMU.

Matt

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