dma: make dma access its own address space
Instead of accessing the cpu address space, use an address space configured by the caller. Eventually all dma functionality will be folded into AddressSpace, but we have to start from something. Reviewed-by: NAnthony Liguori <aliguori@us.ibm.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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