path: root/drivers/s390/crypto/ap_bus.c
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authorNiklas Schnelle <schnelle@linux.ibm.com>2020-03-18 13:53:16 +0100
committerVasily Gorbik <gor@linux.ibm.com>2020-03-23 13:41:55 +0100
commit7a11c67a1ff9b0231eaaaa6a28294776d55b569a (patch)
treefc3c9e0e3410a978059aacef3dfb6642dcb561c2 /drivers/s390/crypto/ap_bus.c
parent969ae01bab2fe938b4c8324836038b5ac1c78fac (diff)
s390/pci: Improve handling of unset UID
When UID checking is enabled a UID value of 0 is invalid and can not be set by the user. On z/VM it is however used to indicate an unset UID. Until now, this lead to the behavior that one PCI function could be attached with UID 0 after which z/VM would prohibit further attachment. Now if the user then turns off UID checking in z/VM the user could seemingly attach additional PCI functions that would however not show up in Linux as that would not be informed of the change in UID checking mode. This is unexpected and confusing and lead to bug reports against Linux. Instead now, if we encounter an unset UID value of 0 treat it as indicating that UID checking was turned off, switch to automatic domain allocation, and warn the user of the possible misconfiguration. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/ap_bus.c')
0 files changed, 0 insertions, 0 deletions

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