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s390/ap: Restrict driver_override versus apmask and aqmask use

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Introduce a restriction for the driver_override feature versus apmask
and aqmask:
- driver_override is only allowed when the apmask and aqmask values
  both are default (=0xffff..ffff).
- apmask and aqmask modifications are only allowed when there is no
  driver_override on any AP device active.
So in the end the user is restricted to choose to either use
apmask/apmask to divide the AP devices into host owned and vfio owned
or use the driver_override feature but not mix these two approaches.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Harald Freudenberger
2025-11-19 16:27:38 +01:00
committed by Heiko Carstens
parent 8babcc2b6a
commit 46030379f1
3 changed files with 56 additions and 6 deletions
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2
drivers/s390/crypto/ap_bus.h
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@@ -281,6 +281,8 @@ struct ap_perms {
};
extern struct ap_perms ap_perms;
extern bool ap_apmask_aqmask_in_use;
extern int ap_driver_override_ctr;
extern struct mutex ap_attr_mutex;
/*