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Date: Sun, 8 Jan 2012 07:36:18 +0700
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Subject: Re: [gentoo-user] gentoo-sources and xen blktap driver?
From: Pandu Poluan <pandu@poluan.info>
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On Jan 8, 2012 12:43 AM, "Michael Mol" <mikemol@gmail.com> wrote:
>
> On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan <pandu@poluan.info> wrote:
> > On Jan 7, 2012 8:44 PM, "victor romanchuk" <rom@persimplex.net> wrote:
> >>
> >> Konstantinos Agouros wrote, at 01/07/2012 03:51 PM:
> >> > since xen got into the mainstream kernel the way to go is to use
> >> > gentoo-sources for dom0 and the domUs. However the blktap modules are
> >> > not
> >> > there. Is there any way to get this to work?
> >>
> >> blktap drivers were excluded from kernel mainline since 3.x, these two
> >> threads
> >> from xen-users mailing list might put some light in that context:
> >>
> >>
> >>
http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html
> >>
> >>
http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html
> >>
> >> the latest sys-kernel/xen-sources containing working blktap (not
blktap2)
> >> is
> >> 2.6.38 (this is buggy from my point of view; i'm still sitting on
> >> 2.6.34-r5 for
> >> production installations)
> >>
> >
> > Can someone shed a light on the importance of blktap, i.e., why one
would
> > want to use it when -- as someone explained in the first email thread
you
> > gave -- blkfront+blkend is enough for paravirtualization?
>
> Reading through the linked threads, it sounds like the benefit stems
> from being able to shim things in between the front and back ends.
>
> You might want that for any number of reasons:
> * a block encryption layer
> * a metering layer
> * a read/write masking layer
> * an intercept to have the block device exist on (or be mirrored to)
> on another system.
>
> etc.
>
Ah yes, of course.
One of the threads also mentioned that blktap might be better implemented
in userspace.
Rgds,
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Content-Type: text/html; charset=UTF-8
<p><br>
On Jan 8, 2012 12:43 AM, "Michael Mol" <<a href="mailto:mikemol@gmail.com">mikemol@gmail.com</a>> wrote:<br>
><br>
> On Sat, Jan 7, 2012 at 11:35 AM, Pandu Poluan <<a href="mailto:pandu@poluan.info">pandu@poluan.info</a>> wrote:<br>
> > On Jan 7, 2012 8:44 PM, "victor romanchuk" <<a href="mailto:rom@persimplex.net">rom@persimplex.net</a>> wrote:<br>
> >><br>
> >> Konstantinos Agouros wrote, at 01/07/2012 03:51 PM:<br>
> >> > since xen got into the mainstream kernel the way to go is to use<br>
> >> > gentoo-sources for dom0 and the domUs. However the blktap modules are<br>
> >> > not<br>
> >> > there. Is there any way to get this to work?<br>
> >><br>
> >> blktap drivers were excluded from kernel mainline since 3.x, these two<br>
> >> threads<br>
> >> from xen-users mailing list might put some light in that context:<br>
> >><br>
> >><br>
> >> <a href="http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html">http://old-list-archives.xen.org/archives/html/xen-users/2011-07/msg00637.html</a><br>
> >><br>
> >> <a href="http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html">http://old-list-archives.xen.org/archives/html/xen-users/2011-10/msg00065.html</a><br>
> >><br>
> >> the latest sys-kernel/xen-sources containing working blktap (not blktap2)<br>
> >> is<br>
> >> 2.6.38 (this is buggy from my point of view; i'm still sitting on<br>
> >> 2.6.34-r5 for<br>
> >> production installations)<br>
> >><br>
> ><br>
> > Can someone shed a light on the importance of blktap, i.e., why one would<br>
> > want to use it when -- as someone explained in the first email thread you<br>
> > gave -- blkfront+blkend is enough for paravirtualization?<br>
><br>
> Reading through the linked threads, it sounds like the benefit stems<br>
> from being able to shim things in between the front and back ends.<br>
><br>
> You might want that for any number of reasons:<br>
> * a block encryption layer<br>
> * a metering layer<br>
> * a read/write masking layer<br>
> * an intercept to have the block device exist on (or be mirrored to)<br>
> on another system.<br>
><br>
> etc.<br>
></p>
<p>Ah yes, of course.</p>
<p>One of the threads also mentioned that blktap might be better implemented in userspace.</p>
<p>Rgds,<br>
</p>
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