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Re: [Qemu-devel] [Libguestfs] [qemu-img] support for XVA

From: Richard W.M. Jones
Subject: Re: [Qemu-devel] [Libguestfs] [qemu-img] support for XVA
Date: Wed, 15 Nov 2017 20:29:38 +0000
User-agent: Mutt/1.5.20 (2009-12-10)

On Wed, Nov 15, 2017 at 09:27:14PM +0100, Max Reitz wrote:
> On 2017-11-15 21:24, Richard W.M. Jones wrote:
> > On Wed, Nov 15, 2017 at 09:07:12PM +0100, Max Reitz wrote:
> >> On 2017-11-15 21:06, Gandalf Corvotempesta wrote:
> >>> 2017-11-15 20:59 GMT+01:00 Max Reitz <address@hidden>:
> >>>> Well, you can't just add support to qemu-img alone either.  Every image
> >>>> format supported by qemu-img is one supported by qemu as a whole and
> >>>> thus needs a proper block driver that needs to support random accesses
> >>>> as well.
> >>>
> >>> I was talking about qemu-img convert, just to convert an XVA image to
> >>> something different, in a single pass, without having to extract the
> >>> tar.
> >>
> >> I know, but that doesn't work.  qemu-img convert uses the normal
> >> general-purpose block drivers for that.
> > 
> > In any case there's no need as qemu/qemu-img can already access files
> > inside an uncompressed tarball using the offset/size support added to
> > the raw driver exactly for this purpose:
> > 
> > https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg03945.html
> If that works, yes.  To me it doesn't look like XVA is just a single raw
> image inside of a tarball, but I may very well be wrong, of course.

Gandalf, is there an XVA file publically available (pref. not
too big) that we can look at?


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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