On 01/09/2013 08:07 PM, Liu Yuan wrote: > and my proposal (adding another field to BlockDriverState to allow > self-interpretation cache flag) can work well with current block layer: > > Sheepdog driver behavior: > cache flags WCE toggled and resulting behavior > writethrough writethrough > writeback writetrhough (writeback + flush) > > We can see that the writeback behavior for Guest-WCE toggling is the > same as expected. The difference is that if we set cache=writethrough, > guest can't change it via WCE toggling.
I am wondering if above scheme can apply to the block layer, then 'cache=xxx' can act as a stronger control over WCE toggling. Then we don't need extra field. Thanks, Yuan
