nvme: Add support for Read Data and Write Data in CMBs.
Add the ability for the NVMe model to support both the RDS and WDS modes in the Controller Memory Buffer. Although not currently supported in the upstreamed Linux kernel a fork with support exists [1] and user-space test programs that build on this also exist [2]. Useful for testing CMB functionality in preperation for real CMB enabled NVMe devices (coming soon). [1] https://github.com/sbates130272/linux-p2pmem [2] https://github.com/sbates130272/p2pmem-testSigned-off-by: NStephen Bates <sbates@raithlin.com> Reviewed-by: NLogan Gunthorpe <logang@deltatee.com> Reviewed-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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