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From: Amit Shah <amit.shah@redhat.com>
To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
	Gerd Hoffmann <kraxel@redhat.com>,
	qemu-devel@nongnu.org, kvm@vger.kernel.org,
	virtualization@lists.linux-foundation.org
Subject: Re: [Qemu-devel] Re: virtio-serial: An interface for host-guest communication
Date: Thu, 20 Aug 2009 20:08:02 +0530	[thread overview]
Message-ID: <20090820143802.GA20265@amit-x200.redhat.com> (raw)
In-Reply-To: <20090820142509.GD27710@redhat.com>

On (Thu) Aug 20 2009 [15:25:09], Daniel P. Berrange wrote:
> On Thu, Aug 20, 2009 at 07:12:41PM +0530, Amit Shah wrote:
> > 
> > I've now seen some more code here and to me it looks like virtioconsole
> > is not used on any of the guests that qemu supports. The virtio_console
> > kernel module only works with lguest and s390 currently. There is one
> > feature and some config values supported by the kernel module but not in
> > qemu.
> > 
> > So it looks as if we have virtio-console merged but no one uses it. Is
> > this right?
> 
> Nope. Grab a Fedora 11 live CD, and boot with
> 
>   # qemu-kvm -virtioconsole stdio -cdrom Fedora-11-i686-Live.iso  -m 500
> 
> Once it completes booting & logs into gnome, open a terminal and run
> as root
> 
>    agetty /dev/hvc0 9600 vt100  
> 
> You'll get a login prompt on the host machine now.
> 
> What appears to not be working, is early kernel boot messages. eg, I
> ought to be able todo

Oh; ok. So the console device is exposed only in the userspace; it's not
used for the early boot messages and not registered early-on. That's
only done for lguest and s390.

>   # qemu-kvm -virtioconsole stdio -kernel vmlinuz -initrd initrd.img \
>       -append "console=hvc0"  -m 500
> 
> and see the kernel boot messages, but this doesn't work with Fedora
> kernels at least. Not tried upstream, or looked to see if this is just
> an oversight in the Kconfig use for Fedora kernels.

Thanks,

		Amit

  reply	other threads:[~2009-08-20 14:38 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-07-27 18:04 [Qemu-devel] virtio-serial: An interface for host-guest communication Amit Shah
2009-07-27 18:04 ` [Qemu-devel] [PATCH 1/1] virtio_serial: A char device for simple guest <-> host communication Amit Shah
2009-07-27 18:04   ` [Qemu-devel] [PATCH 1/3] virtio-serial: virtio device for simple host <-> guest communication Amit Shah
2009-07-27 18:04     ` [Qemu-devel] [PATCH 2/3] vnc: add a is_vnc_active() helper Amit Shah
2009-07-27 18:04       ` [Qemu-devel] [PATCH 3/3] virtio-serial: vnc: support for sending / receiving guest clipboard Amit Shah
2009-08-05  0:03   ` [Qemu-devel] Re: [PATCH 1/1] virtio_serial: A char device for simple guest <-> host communication Rusty Russell
2009-08-05  5:12     ` Amit Shah
2009-08-05  9:58     ` Amit Shah
2009-07-27 20:22 ` [Qemu-devel] Re: virtio-serial: An interface for host-guest communication Anthony Liguori
2009-07-27 20:32   ` Daniel P. Berrange
2009-07-27 20:37     ` Anthony Liguori
2009-07-27 20:46     ` Jamie Lokier
2009-07-27 23:44       ` Anthony Liguori
2009-07-28 10:36         ` Amit Shah
     [not found]           ` <4A6F0048.1000103@codemonkey.ws>
2009-07-29  7:44             ` Amit Shah
2009-07-29  7:48               ` Gleb Natapov
2009-08-05 18:00                 ` Jamie Lokier
     [not found]         ` <20090728140029.GA16067@amd.home.annexia.org>
2009-07-28 14:48           ` Anthony Liguori
2009-07-28 14:55             ` Richard W.M. Jones
2009-07-28 15:00               ` Anthony Liguori
2009-08-03 19:57           ` Anthony Liguori
2009-08-05 17:57             ` Jamie Lokier
2009-08-05 18:00               ` Anthony Liguori
2009-08-06 10:38                 ` Amit Shah
2009-08-06 13:29                   ` Anthony Liguori
2009-08-06 13:41                     ` Amit Shah
2009-08-06 13:58                       ` Anthony Liguori
2009-08-06 14:04                         ` Amit Shah
2009-08-06 17:37                           ` Jamie Lokier
2009-08-07  6:38                             ` Amit Shah
2009-08-07 14:14                               ` Anthony Liguori
2009-08-10  6:55                                 ` Amit Shah
2009-08-10  9:47                                   ` Gerd Hoffmann
2009-08-10 13:02                                     ` Anthony Liguori
2009-08-10 14:02                                       ` Gerd Hoffmann
2009-08-10 14:20                                         ` Anthony Liguori
2009-08-10 15:34                                           ` Gerd Hoffmann
2009-08-10 16:59                                             ` Anthony Liguori
2009-08-10 17:27                                               ` Anthony Liguori
2009-08-12 18:27                                               ` Paul Brook
2009-08-14  8:15                                               ` Amit Shah
2009-08-14 13:29                                                 ` Anthony Liguori
2009-08-14 13:41                                                   ` Amit Shah
2009-08-20 13:42                                                   ` Amit Shah
2009-08-20 14:25                                                     ` Daniel P. Berrange
2009-08-20 14:38                                                       ` Amit Shah [this message]
2009-08-20 14:42                                                         ` Amit Shah
2009-08-14 13:49                                                 ` Gerd Hoffmann
2009-08-14 16:25                                                   ` Anthony Liguori
2009-08-20  7:31                                                     ` Rusty Russell
2009-08-20  7:44                                                       ` Gerd Hoffmann
2009-08-20  7:55                                                         ` Amit Shah
2009-08-20 17:10                                                           ` Jamie Lokier
2009-08-25 12:43                                                         ` Rusty Russell
2009-08-25 13:00                                                           ` Gerd Hoffmann
2009-08-10 14:20                                         ` Anthony Liguori
2009-08-10 23:09                                     ` Rusty Russell
2009-08-11  0:16                                       ` Anthony Liguori
2009-08-10 14:27                                   ` Anthony Liguori
2009-08-10 15:57                                     ` Gerd Hoffmann
2009-08-06 10:35               ` Amit Shah
2009-08-05 18:32             ` Richard W.M. Jones

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