From: Anthony Liguori <anthony@codemonkey.ws>
To: Avi Kivity <avi@redhat.com>
Cc: Bruce Rogers <brogers@novell.com>,
Markus Armbruster <armbru@redhat.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] move 'unsafe' to end of caching modes in help
Date: Mon, 26 Jul 2010 14:03:50 -0500 [thread overview]
Message-ID: <4C4DDC16.2000603@codemonkey.ws> (raw)
In-Reply-To: <4C4DB7D4.3090405@redhat.com>
On 07/26/2010 11:29 AM, Avi Kivity wrote:
> On 07/26/2010 07:26 PM, Avi Kivity wrote:
>>
>>> The help output is *not* a supported interface.
>>
>> There is no supported, usable interface for this.
>
> Well actually, libvirt could probe this by starting qemu with cache=x
> for various x and seeing if it breaks. But the milk has already been
> spilled.
So we're stuck with supporting the help output as an interface
forever? Even with a capabilities system, what about old versions of
libvirt?
At some point in time, old versions of libvirt are going to stop working
with new versions of QEMU because the help output changes. If libvirt
switches to something more reliable (like versioning), then the gap is
closed until there is a capabilities system.
There will be a breakage though and we shouldn't pretend that taking
this patch does anything other than delay that breakage.
Regards,
Anthony Liguori
next prev parent reply other threads:[~2010-07-26 19:03 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-21 20:32 [Qemu-devel] [PATCH] move 'unsafe' to end of caching modes in help Bruce Rogers
2010-07-21 20:55 ` Anthony Liguori
2010-07-21 21:32 ` Daniel P. Berrange
2010-07-21 21:45 ` Anthony Liguori
2010-07-21 21:58 ` Daniel P. Berrange
2010-07-21 23:39 ` Anthony Liguori
2010-07-22 0:45 ` Jamie Lokier
2010-07-22 6:53 ` Markus Armbruster
2010-07-22 8:42 ` Daniel P. Berrange
2010-07-22 14:19 ` Anthony Liguori
2010-07-23 8:00 ` Markus Armbruster
2010-07-26 15:53 ` Anthony Liguori
2010-07-26 16:26 ` Avi Kivity
2010-07-26 16:29 ` Avi Kivity
2010-07-26 19:03 ` Anthony Liguori [this message]
2010-07-26 19:24 ` Avi Kivity
2010-07-26 19:43 ` [Qemu-devel] " Juan Quintela
2010-07-26 16:40 ` [Qemu-devel] " Anthony Liguori
2010-07-26 16:54 ` Avi Kivity
2010-07-26 18:59 ` Anthony Liguori
2010-07-26 19:19 ` Avi Kivity
2010-07-26 19:35 ` Anthony Liguori
2010-07-26 19:43 ` Avi Kivity
2010-07-26 20:03 ` Anthony Liguori
2010-07-27 8:11 ` Markus Armbruster
2010-07-27 9:47 ` Jes Sorensen
2010-07-27 12:30 ` Cole Robinson
2010-07-27 12:50 ` Anthony Liguori
2010-07-27 13:35 ` Cole Robinson
2010-07-27 8:26 ` Markus Armbruster
2010-08-03 9:43 ` Richard W.M. Jones
2010-07-27 8:56 ` Kevin Wolf
2010-07-22 13:45 ` Luiz Capitulino
2010-07-27 10:26 ` Daniel P. Berrange
2010-07-27 13:11 ` Bruce Rogers
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