Re: [Qemu-devel] [PATCH 3/3] pvpanic: rename to isa-pvpanic

[Paolo Bonzini <pbonzini@redhat.com>]

Il 21/08/2013 19:35, Andreas Färber ha scritto:
> Am 21.08.2013 19:01, schrieb Michael S. Tsirkin:
>> On Wed, Aug 21, 2013 at 06:43:16PM +0200, Paolo Bonzini wrote:
>>> The pvpanic situation is already messed up enough.  Let us give our
>>> libvirt friends an easy indication that we have untied our side.
>>>
>>> Not-yet-signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
>>> ... because we first have to determine how to expose the device's existence
>>>     in the ACPI tables or in fw_cfg.
>>>
>>> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
>>
>> So it's isa-pvpanic meaning "I-am-sure-this-is-the-last-bug-pvpanic"
>>
>> If we feel there's need to give libvirt a way to do
>> introspection into QEMU bugs, let's architect one.
>> Randomly renaming devices in the vain hope it's
>> the last major bug is not it.
>>
>> NACK
> 
> Seconded. While we shouldn't rule out renaming devices, doing so as a
> criteria for libvirt sounds utterly wrong.
> 
> Paolo, you are right that a single "NACK" cannot be a criteria, but a
> single convincing justification by a random reviewer should be
> sufficient to reconsider. :)
> 
> Adding some device property or obtaining the info via some existing
> query-* QMP command might be better alternatives.

Device properties are a good way to communicate changes to the guest,
but here the guest ABI is unchanged.

Anyhow, this patch is not strictly necessary.  It's just a safety net to
avoid that libvirt uses a buggy device on buggy versions of QEMU.

Paolo