On 02/23/2018 11:55 AM, David Hildenbrand wrote: > On 23.02.2018 09:11, Christian Borntraeger wrote: >> commit 35b3fde6203b ("KVM: s390: wire up bpb feature") has no >> documentation for KVM_CAP_S390_BPB. While adding this let's also add >> other missing capabilities like KVM_CAP_S390_PSW, KVM_CAP_S390_GMAP and >> KVM_CAP_S390_COW. >> >> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> >> --- >> Documentation/virtual/kvm/api.txt | 29 +++++++++++++++++++++++++++++ >> 1 file changed, 29 insertions(+) >> >> diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt >> index e5f1743e0b3e..4f329882016c 100644 >> --- a/Documentation/virtual/kvm/api.txt >> +++ b/Documentation/virtual/kvm/api.txt >> @@ -4419,3 +4419,32 @@ Parameters: none >> This capability indicates if the flic device will be able to get/set the >> AIS states for migration via the KVM_DEV_FLIC_AISM_ALL attribute and allows >> to discover this without having to create a flic device. >> + >> +8.14 KVM_CAP_S390_PSW >> + >> +Architectures: s390 >> + >> +This capability indicates that the PSW is exposed via the kvm_run structure. >> + >> +8.15 KVM_CAP_S390_GMAP >> + >> +Architectures: s390 >> + >> +This capability indicates that the user space memory used as guest mapping can >> +be anywhere in the user memory address space, as long as the memory slots are >> +aligned and sized to a segment (1MB) boundary. >> + >> +8.16 KVM_CAP_S390_COW >> + >> +Architectures: s390 >> + >> +This capability indicates that the user space memory used as guest mapping can >> +use copy-on-write semantics as well as dirty pages tracking via read-only page >> +tables. >> + >> +8.17 KVM_CAP_S390_BPB >> + >> +Architectures: s390 >> + >> +This capability indicates that kvm will implement the interfaces to handle >> +reset, migration and nested KVM for branch prediction blocking. >> > > Maybe add a comment about bpb being exposed via CPU model (stfl) and > that it should not be used without this capability? Something like: "The stfle facility 82 should not be provided to the guest without this capability". ? -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html