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Revision 1063b8b1

ID1063b8b15fb49fcf88ffa282b19aaaf7ca9c678c

Added by Christoph Hellwig almost 15 years ago

virtio-blk: add SGI_IO passthru support

[had the qemu list address wrong the first time, reply to this message,
not the previous if you were on Cc]

Add support for SG_IO passthru (packet commands) to the virtio-blk
backend. Conceptually based on an older patch from Hannes Reinecke
but largely rewritten to match the code structure and layering in
virtio-blk.

Note that currently we issue the hose SG_IO synchronously. We could
easily switch to async I/O, but that would required either bloating
the VirtIOBlockReq by the size of struct sg_io_hdr or an additional
memory allocation for each SG_IO request.

Signed-off-by: Christoph Hellwig <>
Signed-off-by: Anthony Liguori <>

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