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Re: [Qemu-devel] Re: [PATCH 0/2] port over extboot from kvm

From: Avi Kivity
Subject: Re: [Qemu-devel] Re: [PATCH 0/2] port over extboot from kvm
Date: Tue, 08 Sep 2009 19:05:15 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20090814 Fedora/3.0-2.6.b3.fc11 Thunderbird/3.0b3

On 09/08/2009 05:32 PM, Anthony Liguori wrote:
Gerd Hoffmann wrote:
On 09/08/09 15:47, Jan Kiszka wrote:

Before setting this definitely useful feature in stone, I have two
questions though:

  - -drive ...,boot=on is logically in conflict with -boot. Yes, -boot

x86 boot is strange. The BIOS boots from the "first hard disk" What extboot allows you do to is redefine to the bios what constitutes the "first hard disk".

It's not just booting - it's the int 0x13 interface. Grub for example continues to use it and can boot from the second hard disk if desired.

This is the motivation for making it a -drive option. Perhaps this is something we want to hide from the user but that was the motivation.

I agree with this and I think we should extend it to boot=0x80|0x81.... boot=on is an alias to boot=0x80.

For instance, it would not be possible to define a boot sequence of "first virtio disk, then second virtio disk, then cdrom" because we can't present two disks as the first hard disk.

If extboot supported BCV and our bios did, the above would be possible.

error compiling committee.c: too many arguments to function

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