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?
--
Thanks,
David / dhildenb
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