From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Hannes Reinecke <hare@suse.de>, Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 0/2] port over extboot from kvm
Date: Wed, 11 Nov 2009 13:54:58 +0000 [thread overview]
Message-ID: <200911111354.58540.paul@codesourcery.com> (raw)
In-Reply-To: <4AFABB35.4070100@codemonkey.ws>
On Wednesday 11 November 2009, Anthony Liguori wrote:
> Hannes Reinecke wrote:
> > But why? Why do we have to emulate the entire HBA for the BIOS?
> > The HBA is emulated, too, and just uses the bdrv interface
> > internally anyway.
> > So IMHO it makes far more sense to skip the HBA emulation in
> > the BIOS completely and just use the bdrv interface directly
> > here.
>
> If you use the bdrv interface (ala extboot), you couldn't boot via scsi
> passthrough.
>
> VirtualBox implements a paravirtual SCSI bus to allow SCSI boot without
> having to implement a full LSI driver. That's another way to solve the
> problem.
This has its own issues. How do you prevent the guest enumerating both the
paravirt and "real" adapters, and getting the same disk twice? If this isn't a
problem, then surely the user can do this explicitly.
In this case "guest" includes future fancy versions of the BIOS/bootloader.
Paul
prev parent reply other threads:[~2009-11-11 13:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-08 9:17 [Qemu-devel] [PATCH 0/2] port over extboot from kvm Gerd Hoffmann
2009-09-08 9:17 ` [Qemu-devel] [PATCH 1/2] extboot: add option rom Gerd Hoffmann
2009-09-08 9:17 ` [Qemu-devel] [PATCH 2/2] extboot: qemu code Gerd Hoffmann
2009-09-08 11:59 ` [Qemu-devel] [PATCH 0/2] port over extboot from kvm Gerd Hoffmann
2009-09-08 13:47 ` [Qemu-devel] " Jan Kiszka
2009-09-08 14:22 ` Gerd Hoffmann
2009-09-08 14:32 ` Anthony Liguori
2009-09-08 16:05 ` Avi Kivity
2009-09-08 17:21 ` Anthony Liguori
2009-09-08 19:11 ` Avi Kivity
2009-09-08 19:46 ` Anthony Liguori
2009-09-08 20:00 ` Avi Kivity
2009-09-08 20:10 ` Anthony Liguori
2009-09-12 15:03 ` Kevin O'Connor
2009-09-08 14:40 ` Jan Kiszka
2009-09-08 14:52 ` Gerd Hoffmann
2009-09-08 16:15 ` Jan Kiszka
2009-09-08 17:12 ` Anthony Liguori
2009-09-08 19:03 ` Gerd Hoffmann
2009-09-08 19:39 ` Anthony Liguori
2009-09-12 15:43 ` Kevin O'Connor
2009-09-08 14:16 ` [Qemu-devel] " Anthony Liguori
2009-11-09 16:06 ` Paul Brook
2009-11-09 16:31 ` Gerd Hoffmann
2009-11-09 16:40 ` Anthony Liguori
2009-11-11 13:01 ` Hannes Reinecke
2009-11-11 13:25 ` Anthony Liguori
2009-11-11 13:54 ` Paul Brook [this message]
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