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| author | Radim Krčmář <rkrcmar@redhat.com> | 2016-07-21 14:20:42 +0200 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2016-07-21 14:20:42 +0200 |
| commit | 61f5dea179653558562ba9a5dd71eb29d91a383e (patch) | |
| tree | 09be280e5bd85517b176060e4cdb3b4fa5a34c3d /Documentation/virtual/kvm | |
| parent | KVM: x86: bump KVM_MAX_VCPU_ID to 1023 (diff) | |
| parent | KVM: s390: let ptff intercepts result in cc=3 (diff) | |
| download | linux-61f5dea179653558562ba9a5dd71eb29d91a383e.tar.xz linux-61f5dea179653558562ba9a5dd71eb29d91a383e.zip | |
Merge tag 'kvm-s390-next-4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into next
KVM: s390: : Feature and fix for kvm/next (4.8) part 4
1. Provide an exit to userspace for the invalid opcode 0 (used for
software breakpoints)
2. "Fix" (by returning condition code 3) some unhandled PTFF subcodes
Diffstat (limited to 'Documentation/virtual/kvm')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index c4d2fb0e28de..299306db5d84 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -3857,6 +3857,19 @@ as a broadcast even in x2APIC mode in order to support physical x2APIC without interrupt remapping. This is undesirable in logical mode, where 0xff represents CPUs 0-7 in cluster 0. +7.8 KVM_CAP_S390_USER_INSTR0 + +Architectures: s390 +Parameters: none + +With this capability enabled, all illegal instructions 0x0000 (2 bytes) will +be intercepted and forwarded to user space. User space can use this +mechanism e.g. to realize 2-byte software breakpoints. The kernel will +not inject an operating exception for these instructions, user space has +to take care of that. + +This capability can be enabled dynamically even if VCPUs were already +created and are running. 8. Other capabilities. ---------------------- |