Re: [RFC PATCH 0/2] dm crypt: Allow unaligned buffer lengths for skcipher devices

Mikulas Patocka <[email protected]> Thu, 24 Sep 2020 08:40:25 -0400 (EDT)

Newsgroups	gmane.linux.kernel.device-mapper.devel,gmane.linux.kernel.device-mapper.dm-crypt
Message-ID	<alpine.LRH.2.02.2009240834020.11084@file01.intranet.prod.int.rdu2.redhat.com>

On Wed, 23 Sep 2020, Sudhakar Panneerselvam wrote:

> Could someone review this patch set, please?
> 
> Thanks
> Sudhakar

Hi

I'd like to ask - what sector size do you use in dm-crypt? Could the issue 
be fixed just by using the smallest possible 512-byte sectors?

What I/O method does qemu use? Is it direct i/o + aio? What is unaligned - 
the base address? Or length? Or the sector number? Could you use strace on 
qemu and show an example of an I/O that fails due to alignment?

Mikulas