qemu-img: Document --force-share / -U

qemu with hax to log dma reads & writes jcs.org/2018/11/12/vfio

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kashyap Chamarthy <kchamart@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

authored by

Fam Zheng and committed by

Kevin Wolf 8 years ago a7e326df c150eb92

1 changed file

expand all

qemu-img.texi

··· 86 86 the @var{-n} parameter to skip image creation. This restriction may be relaxed 87 87 in a future release. 88 88 89 + @item --force-share (-U) 90 + If specified, @code{qemu-img} will open the image in shared mode, allowing 91 + other QEMU processes to open it in write mode. For example, this can be used to 92 + get the image information (with 'info' subcommand) when the image is used by a 93 + running guest. Note that this could produce inconsistent results because of 94 + concurrent metadata changes, etc. This option is only allowed when opening 95 + images in read-only mode. 96 + 89 97 @item --backing-chain 90 98 will enumerate information about backing files in a disk image chain. Refer 91 99 below for further description.