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s390x: Add unpack facility feature to GA1 

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:
     * vfio devices
     * Migration
     * Huge page backings

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200319131921.2367-17-frankja@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Christian Borntraeger 2020-03-19 09:19:21 -04:00 committed by Cornelia Huck
parent 42fc5eae91
commit 572c082661
2 changed files with 9 additions and 0 deletions
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1
target/s390x/gen-features.c
View File

@ -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)

8
target/s390x/kvm.c
View File

@ -2425,6 +2425,14 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
clear_bit(S390_FEAT_BPB, model->features);
}
/*
* If we have support for protected virtualization, indicate
* the protected virtualization IPL unpack facility.
*/
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);