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). Stefan
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