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Re: [Qemu-devel] Why is SeaBIOS used with -kernel?
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] Why is SeaBIOS used with -kernel? |
Date: |
Tue, 5 Apr 2016 06:38:36 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 01.04.2016 um 13:20 hat Richard W.M. Jones geschrieben:
>
> My patch, plus the configuration and comments from your patch,
> combined. Plus I tested it with libguestfs boot-analysis and it works
> and is still fast.
>
> Integrating this so it happens automatically when the user adds
> -kernel on x86 seems quite complicated. The only way I could do it
> was by adding #ifdef defined(__x86_64__) etc to vl.c, which doesn't
> seem very nice. The problem is the machine type code doesn't know
> that you're using -kernel.
I would actually find it rather surprising to get differernt BIOSes and
therefore potentially different behaviour for -kernel and for booting
from an image. Even if we made sure that Linux really never touches the
parts that you disable in bios-fast.bin, remember that -kernel is not
only for Linux, but for arbitrary kernels.
Requiring an explicit -bios option like you do now seems to make most
sense to me: The default behaves the same as a normal boot, but if you
are one of the cases that do need that additional boot speed, you can do
that and consciously sacrifice the features.
Kevin
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, (continued)
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Dr. David Alan Gilbert, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Gerd Hoffmann, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Gerd Hoffmann, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Paolo Bonzini, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?,
Kevin Wolf <=
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/05
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Kevin Wolf, 2016/04/05
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/05
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Kevin Wolf, 2016/04/05
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Gerd Hoffmann, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Kevin O'Connor, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Paolo Bonzini, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/01
- Re: [Qemu-devel] Why is SeaBIOS used with -kernel?, Richard W.M. Jones, 2016/04/01