On 04/17/2018 06:10 AM, Cornelia Huck wrote:
On Tue, 17 Apr 2018 09:49:58 +0200
"Harald Freudenberger" <FREUDE@xxxxxxxxxx> wrote:
Didn't we say that when APXA is not available there is no Crypto support
for KVM ?
[Going by the code, as I don't have access to the architecture]
Current status seems to be:
- setup crycb if facility 76 is available (that's MSAX3, I guess?)
The crycb is set up regardless of whether STFLE.76 (MSAX3) is
installed or not.
- use format 2 if APXA is available, else use format 1
Use format 0 if MSAX3 is not available
Use format 1 if MSAX3 is available but APXA is not
Use format 2 if MSAX3 and APXA is available
From Tony's patch description, the goal seems to be:
- setup crycb even if MSAX3 is not available
Yes, that is true
So my understanding is that we use APXA only to decide on the format of
the crycb, but provide it in any case?
Yes, that is true
(Not providing a crycb if APXA is not available would be loss of
functionality, I guess? Deciding not to provide vfio-ap if APXA is not
available is a different game, of course.)
This would require a change to enabling the CPU model feature for
AP.
--
To unsubscribe from this list: send the line "unsubscribe linux-s390" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
