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hw/block/nvme: support namespace attachment command
This patch supports Namespace Attachment command for the pre-defined nvme-ns device nodes. Of course, attach/detach namespace should only be supported in case 'subsys' is given. This is because if we detach a namespace from a controller, somebody needs to manage the detached, but allocated namespace in the NVMe subsystem. As command effect for the namespace attachment command is registered, the host will be notified that namespace inventory is changed so that host will rescan the namespace inventory after this command. For example, kernel driver manages this command effect via passthru IOCTL. Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Klaus Jensen <k.jensen@samsung.com> Tested-by: Klaus Jensen <k.jensen@samsung.com> [k.jensen: rebased for dma refactor] Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
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