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Re: [Qemu-devel] [PATCH v2 2/5] Fix migration in case of scsi-generic

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2 2/5] Fix migration in case of scsi-generic
Date: Thu, 14 May 2015 15:21:11 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 14/05/2015 13:02, Dimitris Aragiorgis wrote:
> Also note that QEMU seems to flush the disk cache explicitly in
> case of iSCSI, using iscsi_synchronizecache10_task() from libiscsi
> inside iscsi_co_flush().

Right, QEMU does that if type is DISK only.

> Perhaps we can also extend this approach to scsi-generic e.g. by
> calling sg_ll_sync_cache_10() from libsgutils2. This is a distinct,
> orthogonal patch that could be added in the future.

Yes.  But do not use libsgutils2, just do it manually in QEMU.  See
for example get_stream_blocksize in hw/scsi/scsi-generic.c.


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