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Re: [Qemu-devel] [PATCH 0/3] Support streaming to an intermediate layer


From: Alberto Garcia
Subject: Re: [Qemu-devel] [PATCH 0/3] Support streaming to an intermediate layer
Date: Fri, 20 Feb 2015 20:05:18 +0100
User-agent: Mutt/1.5.20 (2009-06-14)

On Fri, Feb 20, 2015 at 10:34:58AM -0700, Eric Blake wrote:

> > I followed the proposed API from the wiki, which simply adds an
> > additional 'top' parameter to block-stream specifying the image
> > that data is written to:
> 
> How does one learn whether qemu is new enough to support this
> mode? Until we add QMP introspection, learning whether an optional
> parameter exists requires attempting the command and seeing a
> different error depending on whether the argument is recognized.

Isn't it possible to just check the QEMU version number?

If not, what's the recommended way to do it?

Thanks,

Berto



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