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Re: [Qemu-devel] [PATCH 0/5] SCSI passthrough cleanup
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] [PATCH 0/5] SCSI passthrough cleanup |
Date: |
Thu, 24 Jan 2008 09:17:40 +0100 |
Le mercredi 23 janvier 2008 à 21:52 +0100, Fabrice Bellard a écrit :
> Two questions:
>
> - Why do you use AIO ? If the Linux sg device supports selects, then
> using the QEMU select() callback suffices.
Basically because when I want to have asynchronous I/O I use AIO...
If you explain me briefly how to use selects in Qemu I can try.
> - Why do you use a block device ?
Because to communicate with SG device we need a file descriptor, and
using current mechanism (with -drive) allows to have this file
descriptor without modifying anything else (without adding a new
parameter). Moreover, to use Qemu AIO I need a BlockDriverState (but it
related to the first question...)
I agree to change all of this if you give me tips to use selects in Qemu
and if you thing adding a new command line parameter is not an issue.
> Regards,
>
> Fabrice.
Thank you for your comments and help,
Laurent
> Laurent Vivier wrote:
> > This series of patches makes some cleanups in SCSI passthrough and
> > add functionnalities.
> >
> > [PATCH 1/5] reverse scsi-generic
> >
> > Reverse previous implementation and restore block-raw-posix.c.
> >
> > [PATCH 2/5] Move AIO
> >
> > This patche moves raw AIO part from block-raw-posix.c to qemu-aio-raw.c.
> >
> > [PATCH 3/5] Add block SG interface
> >
> > This patch re-implement scsi-generic.c using a new block interface.
> >
> > [PATCH 4/5] DVD movie support
> >
> > This patch allows to read a protected/encrypted movie from a DVD.
> >
> > [PATCH 5/5] SCSI device DMA split
> >
> > This patch allows to split a READ or WRITE into several READ or WRITE.
> >
> > Laurent
> >
> >
> >
> >
> >
>
>
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Re: [Qemu-devel] [PATCH 0/5] SCSI passthrough cleanup, Fabrice Bellard, 2008/01/23
- Re: [Qemu-devel] [PATCH 0/5] SCSI passthrough cleanup,
Laurent Vivier <=