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From: Luiz Capitulino <lcapitulino@redhat.com>
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Subject: Re: [Qemu-devel] KVM call minutes for 2013-04-23
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To: Eric Blake <eblake@redhat.com>
Cc: KVM devel mailing list <kvm@vger.kernel.org>, qemu-devel qemu-devel <qemu-devel@nongnu.org>, Osier Yang <jyang@redhat.com>, quintela@redhat.com

On Tue, 23 Apr 2013 10:06:41 -0600
Eric Blake <eblake@redhat.com> wrote:

> >   we can change "drive_mirror" to use a new command to see if there
> >   are the new features.
> 
> drive-mirror changed in 1.4 to add optional buf-size parameter; right
> now, libvirt is forced to limit itself to 1.3 interface (no buf-size or
> granularity) because there is no introspection and no query-* command
> that witnesses that the feature is present.  Idea was that we need to
> add a new query-drive-mirror-capabilities (name subject to bikeshedding)
> command into 1.5 that would let libvirt know that buf-size/granularity
> is usable (done right, it would also prevent the situation of buf-size
> being a write-only interface where it is set when starting the mirror
> but can not be queried later to see what size is in use).
> 
> Unclear whether anyone was signing up to tackle the addition of a query
> command counterpart for drive-mirror in time for 1.5.

I can do it.

Nice write-up Eric!