Yes, the feature can easily be backported to 4.0:
(optional) b1b9e0dc78a8 update-linux-headers: handle new header file d9cb4336159a linux headers: update against Linux 5.2-rc1 eaf6f642abf1 s390x/cpumodel: ignore csske for expansion <--- this might already be in via LP1830704 2ec038836fa0 s390x/cpumodel: Miscellaneous-Instruction-Extensions Facility 3 5dacbe23d23c s390x/cpumodel: msa9 facility 54d65de0b525 s390x/cpumodel: vector enhancements d220fabf1609 s390x/cpumodel: enhanced sort facility afc7b8666b62 s390x/cpumodel: add Deflate-conversion facility caef62430fed s390x/cpumodel: add gen15 defintions c657e84faee4 s390x/cpumodel: wire up 8561 and 8562 as gen15 machines
Yes, the feature can easily be backported to 4.0:
(optional) b1b9e0dc78a8 update- linux-headers: handle new header file Instruction- Extensions Facility 3
d9cb4336159a linux headers: update against Linux 5.2-rc1
eaf6f642abf1 s390x/cpumodel: ignore csske for expansion <--- this might already be in via LP1830704
2ec038836fa0 s390x/cpumodel: Miscellaneous-
5dacbe23d23c s390x/cpumodel: msa9 facility
54d65de0b525 s390x/cpumodel: vector enhancements
d220fabf1609 s390x/cpumodel: enhanced sort facility
afc7b8666b62 s390x/cpumodel: add Deflate-conversion facility
caef62430fed s390x/cpumodel: add gen15 defintions
c657e84faee4 s390x/cpumodel: wire up 8561 and 8562 as gen15 machines