On Mon, 12 Mar 2018 15:18:30 +0100
Oliver Heid <oliver.h...@h-next.de> wrote:
> Many thanks!
>
> mmap succeeds - I removed the checks only to post the code on this list.
> I use this now:
>
> if ( !ioctl(container, VFIO_IOMMU_MAP_DMA, &dma_map) )
> { if ( !ioctl(container, VFIO_IOMMU_MAP_DMA, &dma_map) )
> { perror("mmap ioctl"); return 1; }
> }
>
Um, the ioctl returns zero on success, as most ioctls do. Your test
only reaches the perror if it's able to successfully dma map the same
area twice, so yeah, I would expect that never "fails".
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