[v4,0/2] Use DIAG318 to set Control Program Name & Version Codes

Message

Collin Walling May 1, 2019, 10:51 p.m. UTC

Changelog:

    v4
        - removed setup.c changes introduced in bullet 1 of v3
        - kept diag318_info struct cleanup
        - analogous QEMU patches:
            https://lists.gnu.org/archive/html/qemu-devel/2019-05/msg00164.html

    v3
        - kernel patch for diag 0x318 instruction call fixup [removed in v4]
        - removed CPU model code
        - cleaned up diag318_info struct
        - cpnc is no longer unshadowed as it was not needed
        - rebased on 5.1.0-rc3

This instruction call is executed once-and-only-once during Kernel setup.
The availability of this instruction depends on Read SCP Info byte 134, bit 0.
Diagnose318's functionality is also emulated by KVM, which means we can 
enable this feature for a guest even if the host kernel cannot support it.

The CPNC and CPVC are used for problem diagnosis and allows IBM to identify 
control program information by answering the following question:

    "What environment is this guest running in?" (CPNC)
    "What are more details regarding the OS?" (CPVC)

In the future, we will implement the Control Program Version Code (CPVC) to
convey more information about the OS. For now, we set this field to 0 until
we come up with a solid plan.

Collin Walling (2):
  s390/setup: diag318: refactor struct
  s390/kvm: diagnose 318 handling

 Documentation/virtual/kvm/devices/vm.txt | 14 ++++++
 arch/s390/include/asm/diag.h             |  6 +--
 arch/s390/include/asm/kvm_host.h         |  7 ++-
 arch/s390/include/uapi/asm/kvm.h         |  4 ++
 arch/s390/kernel/setup.c                 |  3 +-
 arch/s390/kvm/diag.c                     | 17 +++++++
 arch/s390/kvm/kvm-s390.c                 | 83 ++++++++++++++++++++++++++++++++
 arch/s390/kvm/kvm-s390.h                 |  1 +
 arch/s390/kvm/vsie.c                     |  2 +
 9 files changed, 129 insertions(+), 8 deletions(-)