Re: [PATCH v3] target/s390x: support PRNO_TRNG instruction

[Jason A. Donenfeld]

Hey Thomas,

On Wed, Jul 27, 2022 at 08:32:22AM +0200, Thomas Huth wrote:
> On 27/07/2022 03.35, Jason A. Donenfeld wrote:
> > Hey David,
> > 
> > On Wed, Jul 20, 2022 at 08:41:48PM +0200, David Hildenbrand wrote:
> >> I did not review the doc in detail once again, maybe I get to that later
> >> this week.
> > 
> > Did you ever get around to merging this patch? Is it in some tree
> > somewhere?
> 
> QEMU is in the freeze phase now, so new feature won't be merged before the 
> next release, see:

Yea, I understand, that's fine.

> Maybe we could use the time to implement the missing SHA512 stuff to avoid 
> having an inconsistency between the Principles of Operation and the emulated 
> machine in QEMU?

Ooooooooooooooofffff. You're not /wrong/ of course. This actually makes
a lot of sense. But I was hoping to somehow skip out on this part,
because I don't know much about s390 and wiring up the handlers seems
finicky. But I can learn!

Actually, though, any interest in working together on this? I can work
on the crypto-side of things, fashioning a minimal sha512 implementation
that's small enough it can fit in crypto_helper.c with support for the
incremental block state stuff s390 needs, and then you can work on
wiring in all the instructions and telling me what semantics you need
from the crypto.

Interested? (Offer of working together goes out to David too of course.)
If so, maybe poke me on IRC? I'm zx2c4 on the various networks.

Jason