The DMAContext is a simple pointer to an AddressSpace that is now always
already available.  Make everyone hold the address space directly,
and clean up the DMA API to use the AddressSpace directly.
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Initial commit for emulated Non-Volatile-Memory Express (NVMe) pci
storage device.

NVMe is an open, industry driven storage specification defining
an optimized register and command set designed to deliver the full
capabilities of non-volatile memory on PCIe SSDs. Further information
may be found on the organizations website at:

http://www.nvmexpress.org/

This commit implements the minimum from the specification to work with
existing drivers.

Cc: Keith Busch <keith.busch@gmail.com>
Signed-off-by: NKeith Busch <keith.busch@intel.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>