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[Qemu-devel] Re: [PATCH 00/11] AHCI emulation support v9

From: Kevin Wolf
Subject: [Qemu-devel] Re: [PATCH 00/11] AHCI emulation support v9
Date: Tue, 14 Dec 2010 17:28:24 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

Am 14.12.2010 01:34, schrieb Alexander Graf:
> This patch adds support for AHCI emulation. I have tested and verified it 
> works
> in Linux, OpenBSD, Windows Vista and Windows 7. This AHCI emulation supports
> NCQ, so multiple read or write requests can be outstanding at the same time.
> The code is however not fully optimized yet. I'm fairly sure that there are
> low hanging performance fruits to be found still :). In my simple benchmarks
> I achieved about 2/3rd of virtio performance.
> Also, this AHCI emulation layer does not support legacy mode. So if you're
> using a disk with this emulation, you do not get it exposed using the legacy
> IDE interfaces.
> Another nitpick is CD-ROM support in Windows. Somehow it doesn't detect a
> CD-ROM drive attached to AHCI. At least it doesn't list it.
> To attach an AHCI disk to your VM, please use
>   -drive id=disk,file=...,if=none -device ahci,id=ahci \
>   -device ide-drive,drive=disk,bus=ahci.0
> This patch set is based on work done during the Google Summer of Code. I was
> mentoring a student, Roland Elek, who wrote most of the AHCI emulation code
> based on a patch from Chong Qiao. A bunch of other people were also involved,
> so everybody who I didn't mention - thanks a lot!
>   git://repo.or.cz/qemu/ahci.git ahci

I have applied everything but patch 4 (including patch 12/11) to the
block branch. Before I can include it in a pull request I need at least
a new version of patch 3 and you'll probably want to have a new patch 4
in. There's no need to resend the rest of the patch series.

For the changes needed please see the comments on the individual patches.


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