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 > > > > > > > > > > > > -- ----------------- [EMAIL PROTECTED] ------------------ "La perfection est atteinte non quand il ne reste rien à ajouter mais quand il ne reste rien à enlever." Saint Exupéry
