Four bigger things:
1. The implementation of the STHYI opcode in the kernel. This is used
in libraries like qclib [1] to provide enough information for a
capacity and usage based software licence pricing. The STHYI content
is defined by the related z/VM documentation [2]. Its data can be
composed by accessing several other interfaces provided by LPAR or
the machine. This information is partially sensitive or root-only
so the kernel does the necessary filtering.
2. Preparation for nested virtualization (VSIE). KVM should query the
proper sclp interfaces for the availability of some features before
using it. In the past we have been sloppy and simply assumed that
several features are available. With this we should be able to handle
most cases of a missing feature.
3. CPU model interfaces extended by some additional features that are
not covered by a facility bit in STFLE. For example all the crypto
instructions of the coprocessor provide a query function. As reality
tends to be more complex (e.g. export regulations might block some
algorithms) we have to provide additional interfaces to query or
set these non-stfle features.
4. Several fixes and changes detected and fixed when doing 1-3.
All features change base s390 code. All relevant patches have an ACK
from the s390 or component maintainers.
The next pull request for 4.8 (part2) will contain the implementation
of VSIE.
[1] http://www.ibm.com/developerworks/linux/linux390/qclib.html
[2] https://www.ibm.com/support/knowledgecenter/SSB27U_6.3.0/com.ibm.zvm.v630.hcpb4/hcpb4sth.htm
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.14 (GNU/Linux)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=fdBQ
-----END PGP SIGNATURE-----
Merge tag 'kvm-s390-next-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD
KVM: s390: Features and fixes for 4.8 part1
Four bigger things:
1. The implementation of the STHYI opcode in the kernel. This is used
in libraries like qclib [1] to provide enough information for a
capacity and usage based software licence pricing. The STHYI content
is defined by the related z/VM documentation [2]. Its data can be
composed by accessing several other interfaces provided by LPAR or
the machine. This information is partially sensitive or root-only
so the kernel does the necessary filtering.
2. Preparation for nested virtualization (VSIE). KVM should query the
proper sclp interfaces for the availability of some features before
using it. In the past we have been sloppy and simply assumed that
several features are available. With this we should be able to handle
most cases of a missing feature.
3. CPU model interfaces extended by some additional features that are
not covered by a facility bit in STFLE. For example all the crypto
instructions of the coprocessor provide a query function. As reality
tends to be more complex (e.g. export regulations might block some
algorithms) we have to provide additional interfaces to query or
set these non-stfle features.
4. Several fixes and changes detected and fixed when doing 1-3.
All features change base s390 code. All relevant patches have an ACK
from the s390 or component maintainers.
The next pull request for 4.8 (part2) will contain the implementation
of VSIE.
[1] http://www.ibm.com/developerworks/linux/linux390/qclib.html
[2] https://www.ibm.com/support/knowledgecenter/SSB27U_6.3.0/com.ibm.zvm.v630.hcpb4/hcpb4sth.htm
f26ed98326