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From: "Richard W.M. Jones" <rjones@redhat.com>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Anthony Liguori <anthony@codemonkey.ws>,
	qemu-devel <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] Guest kernel device compatability auto-detection
Date: Fri, 26 Aug 2011 09:43:36 +0100	[thread overview]
Message-ID: <20110826084336.GB24160@amd.home.annexia.org> (raw)
In-Reply-To: <1314338882.3647.13.camel@lappy>

On Fri, Aug 26, 2011 at 09:08:02AM +0300, Sasha Levin wrote:
> You're thinking about trying to expose all interfaces during boot and
> seeing which ones the kernel bites?

No, that's a bad idea.  A current guest would register that as two
disks.  It might even try to write to them independently.

You need an IDE device which can be promoted to virtio at the request
of the guest (so you know the guest understands this type of device).

> Another thing that comes to mind is that we could start this project
> with a script that given a kernel, it would find the optimal hardware
> configuration for it (and the matching QEMU command line).

It would be better if the guest could communicate what it needs.  But
no current guest works that way.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines.  Supports shell scripting,
bindings from many languages.  http://libguestfs.org

WARNING: multiple messages have this Message-ID (diff)
From: "Richard W.M. Jones" <rjones@redhat.com>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] Guest kernel device compatability auto-detection
Date: Fri, 26 Aug 2011 09:43:36 +0100	[thread overview]
Message-ID: <20110826084336.GB24160@amd.home.annexia.org> (raw)
In-Reply-To: <1314338882.3647.13.camel@lappy>

On Fri, Aug 26, 2011 at 09:08:02AM +0300, Sasha Levin wrote:
> You're thinking about trying to expose all interfaces during boot and
> seeing which ones the kernel bites?

No, that's a bad idea.  A current guest would register that as two
disks.  It might even try to write to them independently.

You need an IDE device which can be promoted to virtio at the request
of the guest (so you know the guest understands this type of device).

> Another thing that comes to mind is that we could start this project
> with a script that given a kernel, it would find the optimal hardware
> configuration for it (and the matching QEMU command line).

It would be better if the guest could communicate what it needs.  But
no current guest works that way.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines.  Supports shell scripting,
bindings from many languages.  http://libguestfs.org

  reply	other threads:[~2011-08-26  8:43 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-25  5:21 Guest kernel device compatability auto-detection Sasha Levin
2011-08-25  5:21 ` [Qemu-devel] " Sasha Levin
2011-08-25  5:33 ` Avi Kivity
2011-08-25  7:32   ` Richard W.M. Jones
2011-08-25  7:32     ` Richard W.M. Jones
2011-08-25  7:40     ` Sasha Levin
2011-08-25  7:40       ` Sasha Levin
2011-08-25  7:48       ` Richard W.M. Jones
2011-08-25 10:01         ` Richard W.M. Jones
2011-08-25 16:25           ` Decker, Schorschi
2011-08-25 16:25             ` [Qemu-devel] " Decker, Schorschi
2011-08-26  6:22             ` Sasha Levin
2011-08-26  6:22               ` Sasha Levin
2011-08-26  8:04               ` Richard W.M. Jones
2011-08-26  8:04                 ` [Qemu-devel] " Richard W.M. Jones
2011-08-26 10:18                 ` Sasha Levin
2011-08-26 10:18                   ` Sasha Levin
2011-08-26 10:28                   ` Richard W.M. Jones
2011-08-26 10:28                     ` Richard W.M. Jones
2011-08-25 21:48 ` Anthony Liguori
2011-08-25 21:48   ` [Qemu-devel] " Anthony Liguori
2011-08-26  6:08   ` Sasha Levin
2011-08-26  6:08     ` [Qemu-devel] " Sasha Levin
2011-08-26  8:43     ` Richard W.M. Jones [this message]
2011-08-26  8:43       ` Richard W.M. Jones
2011-08-26  8:40   ` Richard W.M. Jones

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