libvirt/tests/qemublocktestdata/xml2json/file-raw-luks.json
Peter Krempa 2c4c347c4b qemu: block: Use 'auto-read-only' instead of 'read-only' for backing chain
To allow using -blockdev with blockjobs QEMU needs to reopen files in
read-write mode when modifying the backing chain. To achieve this we
need to use 'auto-read-only' for the backing files rather than the
normal 'read-only' property. That way qemu knows that the files need to
be reopened.

Note that the format drivers (e.g. qcow2) are still opened with the
read-only property enabled when being a member of the backing chain
since they are supposed to be immutable unless a block job is started.

QEMU v4.0 (since commit 23dece19da4) allows also dynamic behaviour for
auto-read-only which allows us to use sVirt as we only grant write
permissions to files when doing a blockjob.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
2019-07-18 17:59:34 +02:00

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{
"node-name": "test1",
"read-only": false,
"driver": "luks",
"key-secret": "test1-encalias",
"file": "test2"
}
{
"driver": "file",
"filename": "/path/luks.img",
"node-name": "test2",
"auto-read-only": true,
"discard": "unmap"
}