On 10/06/2009 08:18 PM, Ira W. Snyder wrote:
The limitation I have is that memory made available from the host system (PCI card) as PCI BAR1 must not be migrated around in memory. I can only change the address decoding to hit a specific physical address. AFAIK, this means it cannot be userspace memory (since the underlying physical page could change, or it could be in swap), and must be allocated with something like __get_free_pages() or dma_alloc_coherent().
Expose it as /dev/something (/dev/mem, /sys/.../pci/...) and mmap() it, and it becomes non-pageable user memory.
Not sure about dma_alloc_coherent(), that is meaningless on x86. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
