On Wed, May 10 2017 at 9:37am -0400, Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> wrote: > On Wed, May 10, 2017 at 11:49 AM, Neeraj Soni <neersoni@xxxxxxxxxxxxxx> wrote: > > Hi Keith, > > > > Request based dm (dm-req-crypt) is being used for Disk Encryption solution > > in Android used by Google. Also as i mentioned reverting this fix improves > > the RR/RW numbers so this proves the request based dm is coming into path > > and is being used. > > Sadly, that is an out of tree module. > > Does it still use Qcom specific APIs in its implementation (qcrypto_* funcs)? > It did the last time I've checked - and the driver that implements > those is not upstream either... > > It makes it difficult to help - which is a shame since I am interested > in enabling higher performance > of dm-crypt when using HW based crypto transformation myself. I have absolutely no interest in request-based dm-crypt. It is a hack to work-around limitations in crypto IV generation. If "google" is foolish enough to deploy out-of-tree request-based dm-crypt in their android kernel then they are easily capable of reverting the commit in question to prop up their short-cited decision. The correct way forward is to follow through with the crypto work discussed here (pick a solution to implement and make it happen): https://www.redhat.com/archives/dm-devel/2017-March/msg00044.html and here: https://www.redhat.com/archives/dm-devel/2017-March/msg00053.html and here: https://www.redhat.com/archives/dm-devel/2017-April/msg00132.html Mike
