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Add support for xl devd to support 9pfs in a domU. devd need to spawn a pvqemu for the domain to service 9pfs as well as qdisk backends. Rename num_qdisks to pvqemu_refcnt to be more generic. Keep the qdisk-backend-pid xenstore key as well as the disk-%u log file. They are externally visible, so they might be used by other tooling. Signed-off-by: Jason Andryuk <jandryuk@gmail.com> Signed-off-by: Jason Andryuk <jason.andryuk@amd.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>