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Re: [Qemu-devel] [PATCH 0/2] extboot reloaded.
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [PATCH 0/2] extboot reloaded. |
Date: |
Tue, 17 Nov 2009 15:23:38 +0100 |
User-agent: |
Thunderbird 2.0.0.23 (X11/20090817) |
Paul Brook wrote:
> On Tuesday 17 November 2009, Gerd Hoffmann wrote:
>
>> On 11/17/09 13:36, Paul Brook wrote:
>>
>>>>> In fact I'd much prefer to see extboot rewritten to just virtio-block.
>>>>>
>>>> Hmm, I'd prefer something which is *not* used by the guest OS, so it is
>>>> a pure bootloader thing. When using it to boot from scsi you don't want
>>>> to have the disk show up twice (as virtio and scsi) in the guest.
>>>>
>>> You're assuming noone ever writes OS support for extboot...
>>>
>> Which would be almost as silly as writing OS support for bios-int13 ...
>>
>
> Not entirely. int13 is a software interface, extboot is a hardware interface.
> Look at it the other way round: If I already have my low performance boot
> device exposed via extboot (on an otherwise diskless client), why should I
> have to also expose it via virtio-blk just so that the guest can access it
> for
> installing kernel upgrades.
>
Because that's not what you'd use it for. That's what -kernel and
-initrd are there for.
IMHO having a BIOS backdoor is a good thing in general. If anyone wants
to destroy their user experience by writing a driver for that in their
OS, I'm good with that, but let's not expose things twice _to users_ as
the default case.
Alex
- [Qemu-devel] [PATCH 2/2] extboot: qemu code., (continued)
- [Qemu-devel] [PATCH 2/2] extboot: qemu code., Gerd Hoffmann, 2009/11/16
- [Qemu-devel] [PATCH 1/2] extboot: add option rom., Gerd Hoffmann, 2009/11/16
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Anthony Liguori, 2009/11/16
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Gerd Hoffmann, 2009/11/16
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Anthony Liguori, 2009/11/16
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Paul Brook, 2009/11/17
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Gerd Hoffmann, 2009/11/17
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Paul Brook, 2009/11/17
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Gerd Hoffmann, 2009/11/17
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Paul Brook, 2009/11/17
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded.,
Alexander Graf <=
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Anthony Liguori, 2009/11/17
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Kevin O'Connor, 2009/11/17
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Anthony Liguori, 2009/11/18
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Kevin O'Connor, 2009/11/18
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Jamie Lokier, 2009/11/16
- Re: [Qemu-devel] [PATCH 0/2] extboot reloaded., Anthony Liguori, 2009/11/16