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Revision 587ed6be

ID587ed6be0b6331b11169da8846b8442840d5428c

Added by Corey Bryant over 11 years ago

qemu-config: Add new -add-fd command line option

This option can be used for passing file descriptors on the
command line. It mirrors the existing add-fd QMP command which
allows an fd to be passed to QEMU via SCM_RIGHTS and added to an
fd set.

This can be combined with commands such as -drive to link file
descriptors in an fd set to a drive:

qemu-kvm -add-fd fd=3,set=2,opaque="rdwr:/path/to/file" 
             -add-fd fd=4,set=2,opaque="rdonly:/path/to/file" 
             -drive file=/dev/fdset/2,index=0,media=disk

This example adds dups of fds 3 and 4, and the accompanying opaque
strings to the fd set with ID=2. qemu_open() already knows how
to handle a filename of this format. qemu_open() searches the
corresponding fd set for an fd and when it finds a match, QEMU
goes on to use a dup of that fd just like it would have used an
fd that it opened itself.

Signed-off-by: Corey Bryant <>
Reviewed-by: Eric Blake <>
Signed-off-by: Kevin Wolf <>

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