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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-09-21 08:53:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-09-21 08:53:48 -0700 |
| commit | beaeb4f39bc31d5a5eb6d05465a86af4fe147732 (patch) | |
| tree | a9f3e96b08e2063571f38abb90693eb548d8c290 /Documentation | |
| parent | Merge tag 'libnvdimm-fixes-5.9-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm (diff) | |
| parent | Merge tag 'kvm-s390-master-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-master (diff) | |
| download | wireguard-linux-beaeb4f39bc31d5a5eb6d05465a86af4fe147732.tar.xz wireguard-linux-beaeb4f39bc31d5a5eb6d05465a86af4fe147732.zip | |
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"ARM:
- fix fault on page table writes during instruction fetch
s390:
- doc improvement
x86:
- The obvious patches are always the ones that turn out to be
completely broken. /me hangs his head in shame"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
Revert "KVM: Check the allocation of pv cpu mask"
KVM: arm64: Remove S1PTW check from kvm_vcpu_dabt_iswrite()
KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch
docs: kvm: add documentation for KVM_CAP_S390_DIAG318
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index d2b733dc7892..51191b56e61c 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -6173,3 +6173,23 @@ specific interfaces must be consistent, i.e. if one says the feature is supported, than the other should as well and vice versa. For arm64 see Documentation/virt/kvm/devices/vcpu.rst "KVM_ARM_VCPU_PVTIME_CTRL". For x86 see Documentation/virt/kvm/msr.rst "MSR_KVM_STEAL_TIME". + +8.25 KVM_CAP_S390_DIAG318 +------------------------- + +:Architectures: s390 + +This capability enables a guest to set information about its control program +(i.e. guest kernel type and version). The information is helpful during +system/firmware service events, providing additional data about the guest +environments running on the machine. + +The information is associated with the DIAGNOSE 0x318 instruction, which sets +an 8-byte value consisting of a one-byte Control Program Name Code (CPNC) and +a 7-byte Control Program Version Code (CPVC). The CPNC determines what +environment the control program is running in (e.g. Linux, z/VM...), and the +CPVC is used for information specific to OS (e.g. Linux version, Linux +distribution...) + +If this capability is available, then the CPNC and CPVC can be synchronized +between KVM and userspace via the sync regs mechanism (KVM_SYNC_DIAG318). |