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Re: [Qemu-block] Virtio-BLK/SCSI write requests and data payload checksu

From: Stefan Hajnoczi
Subject: Re: [Qemu-block] Virtio-BLK/SCSI write requests and data payload checksums
Date: Mon, 17 Dec 2018 14:48:07 +0000
User-agent: Mutt/1.10.1 (2018-07-13)

On Sun, Dec 16, 2018 at 06:53:44PM +0100, Peter Lieven wrote:
> It turned out that for writes a bounce buffer is indeed always necessary. But 
> what I found out is that
> it seems that even for reads it happens that the OS (Windows in this case) 
> issues 2 read requests with
> the same buffer in parallel. Is it possible that this is a bug in the virtio 
> or has anybone ever seen this before?

Is it Windows resume-from-sleep?  I remember a race condition that
Microsoft fixed.

The other weird thing I've seen is scatter-gather lists where the same
buffer address is used multiple times within one request (this can go
wrong if the host splits up the request, causing races).


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