Re: [PATCH] VFIO driver: Non-privileged user level PCI drivers

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On 05/29/2010 02:55 PM, Arnd Bergmann wrote:
On Saturday 29 May 2010, Tom Lyon wrote:
+/*
+ * Structure for DMA mapping of user buffers
+ * vaddr, dmaaddr, and size must all be page aligned
+ * buffer may only be larger than 1 page if (a) there is
+ * an iommu in the system, or (b) buffer is part of a huge page
+ */
+struct vfio_dma_map {
+       __u64   vaddr;          /* process virtual addr */
+       __u64   dmaaddr;        /* desired and/or returned dma address */
+       __u64   size;           /* size in bytes */
+       int     rdwr;           /* bool: 0 for r/o; 1 for r/w */
+};
Please add a 32 bit padding word at the end of this, otherwise the
size of the data structure is incompatible between 32 x86 applications
and 64 bit kernels.

Might as well call it 'flags' and reserve a bit more space (keeping 64-bit aligned size) for future expansion.

rdwr can be folded into it.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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