linux-kernel - Re: [RFC] Unify KVM kernel-space and user-space code into a single project

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Message-ID: <4BAA1ADD.9090502@redhat.com>
Date:	Wed, 24 Mar 2010 15:59:57 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Alexander Graf <agraf@...e.de>
CC:	Joerg Roedel <joro@...tes.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>, ziteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single
 project

On 03/24/2010 03:53 PM, Alexander Graf wrote:
>
>> Someone needs to know about the new guest to fetch its symbols.  Or do
>> you want that part in the kernel too?
>>      
>
> How about we add a virtio "guest file system access" device? The guest
> would then expose its own file system using that device.
>
> On the host side this would simply be a -virtioguestfs
> unix:/tmp/guest.fs and you'd get a unix socket that gives you full
> access to the guest file system by using commands. I envision something
> like:
>    

The idea is to use a dedicated channel over virtio-serial.  If the 
channel is present the file server can serve files over it.

> SEND: GET /proc/version
> RECV: Linux version 2.6.27.37-0.1-default (geeko@...ldhost) (gcc version
> 4.3.2 [gcc-4_3-branch revision 141291] (SUSE Linux) ) #1 SMP 2009-10-15
> 14:56:58 +0200
>
> Now all we need is integration in perf to enumerate virtual machines
> based on libvirt. If you want to run qemu-kvm directly, just go with
> --guestfs=/tmp/guest.fs and perf could fetch all required information
> automatically.
>
> This should solve all issues while staying 100% in user space, right?
>    

Yeah, needs a fuse filesystem to populate the host namespace (kind of 
sshfs over virtio-serial).

-- 
error compiling committee.c: too many arguments to function

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