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Re: [Qemu-devel] [PATCH for-1.6 1/2] don't create pvpanic device by defa


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH for-1.6 1/2] don't create pvpanic device by default.
Date: Fri, 02 Aug 2013 10:27:31 +0200
User-agent: Mozilla/5.0 (X11; Linux ppc; rv:17.0) Gecko/20130704 Icedove/17.0.7

On 08/02/2013 09:04 AM, Hu Tao wrote:
The problem with pvpanic being an internal device is that VMs running
operating systems without a driver for this device will have problems
when qemu will be upgraded (from qemu without this pvpanic).

The outcome may be, for example: in Windows(let's say XP) the Device
manager will open a "new device" wizard and the device will appear as
an unrecognized device. On a cluster with hundreds of such VMs, If
that cluster has a health monitoring service it may show all the VMs
in a "not healthy" state.

Reported-by: Marcel Apfelbaum <address@hidden>
Signed-off-by: Hu Tao <address@hidden>

NACK,

this is premature.  It is fundamentally a firmware problem.

We have time to apply an even smaller patch that doesn't set has_pvpanic to true, and delay the whole feature to 1.7, if we do not fix the firmware in the next two weeks.

Paolo



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