On Wed, 11 Mar 2020 09:21:51 -0400
Janosch Frank <fran...@linux.ibm.com> wrote:
> From: Christian Borntraeger <borntrae...@de.ibm.com>
>
> The unpack facility is an indication that diagnose 308 subcodes 8-10
> are available to the guest. That means, that the guest can put itself
> into protected mode.
>
> Once it is in protected mode, the hardware stops any attempt of VM
> introspection by the hypervisor.
>
> Some features are currently not supported in protected mode:
> * Passthrough devices
> * Migration
> * Huge page backings
>
> Signed-off-by: Christian Borntraeger <borntrae...@de.ibm.com>
> Reviewed-by: David Hildenbrand <da...@redhat.com>
> ---
> target/s390x/gen-features.c | 1 +
> target/s390x/kvm.c | 5 +++++
> 2 files changed, 6 insertions(+)
>
> diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
> index 6278845b12b8dee8..8ddeebc54419a3e2 100644
> --- a/target/s390x/gen-features.c
> +++ b/target/s390x/gen-features.c
> @@ -562,6 +562,7 @@ static uint16_t full_GEN15_GA1[] = {
> S390_FEAT_GROUP_MSA_EXT_9,
> S390_FEAT_GROUP_MSA_EXT_9_PCKMO,
> S390_FEAT_ETOKEN,
> + S390_FEAT_UNPACK,
> };
>
> /* Default features (in order of release)
> diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
> index ff6027036ec2f14a..e11e895a3d9038bb 100644
> --- a/target/s390x/kvm.c
> +++ b/target/s390x/kvm.c
> @@ -2403,6 +2403,11 @@ void kvm_s390_get_host_cpu_model(S390CPUModel
> *model, Error **errp) clear_bit(S390_FEAT_BPB, model->features);
> }
>
> + /* we do have the IPL enhancements */
> + if (cap_protected) {
> + set_bit(S390_FEAT_UNPACK, model->features);
> + }
> +
> /* We emulate a zPCI bus and AEN, therefore we don't need HW
> support */ set_bit(S390_FEAT_ZPCI, model->features);
> set_bit(S390_FEAT_ADAPTER_EVENT_NOTIFICATION, model->features);
Reviewed-by: Claudio Imbrenda <imbre...@linux.ibm.com>
