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Re: [Qemu-devel] [PATCH] CMOS file support
From: |
Mathias Krause |
Subject: |
Re: [Qemu-devel] [PATCH] CMOS file support |
Date: |
Fri, 17 Sep 2010 13:28:41 +0200 |
User-agent: |
Mozilla-Thunderbird 2.0.0.24 (X11/20100328) |
Hi Kevin,
On 17.09.2010 12:44, Kevin Wolf wrote:
> Hi Mathias,
>
> Am 17.09.2010 08:42, schrieb Mathias Krause:
>>> Using QEMU's block devices instead of a simple file would be
>>> more consistent with the rest of QEMU and allow reading the
>>> CMOS data not only from a file but also from an URL or other
>>> sources.
>> Thanks for the hint. Since this is my first contribution to the project
>> I'm not that familiar with the code. Looking at other places, e.g. how
>> the -kernel option gets handled, I just see FILE everywhere. Can you
>> give me some pointers how to use this interface?
>
> Have a look at block.h which contains the prototypes for the public
> block layer interface.
>
> Basically, you need to create a BlockDriverState with bdrv_new() and
> then open it with bdrv_open(). You'll want to specify the raw block
> driver for opening the image, you get it with bdrv_find_format("raw").
> bdrv_pread/pwrite are the right functions to access the file with byte
> granularity (other functions work on 512 byte sectors). bdrv_delete
> frees the the BlockDriverState when you're done.
Thank you for the detailed writeup. I think I should figure out how to
use it myself now. Albeit there seem to be not many users of this
interface right now. Looks like it's currently only used for storage
devices. So I'm questioning myself: What _real_ benefit would it bring
to use the QEMU block device layer for the CMOS file?
Cheers,
Mathias
Re: [Qemu-devel] [PATCH] CMOS file support, Anthony Liguori, 2010/09/16
- Re: [Qemu-devel] [PATCH] CMOS file support, Mathias Krause, 2010/09/17
- Re: [Qemu-devel] [PATCH] CMOS file support, Anthony Liguori, 2010/09/17
- Re: [Qemu-devel] [PATCH] CMOS file support, Mathias Krause, 2010/09/22
- [Qemu-devel] Re: [PATCH] CMOS file support, Paolo Bonzini, 2010/09/23
- Re: [Qemu-devel] [PATCH] CMOS file support, Markus Armbruster, 2010/09/24
- Re: [Qemu-devel] [PATCH] CMOS file support, Mathias Krause, 2010/09/26