s390x: Add unpack facility feature to GA1

References: bsc#1167075

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>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
(cherry picked from commit 3034eaac3b2970ba85a1d77814ceef1352d05357)
Signed-off-by: Bruce Rogers <brogers@suse.com>

diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
index 6278845b12b8dee84c086413c60a7430473e92f9..8ddeebc54419a3e2481e2191638984f24a50041f 100644 (file)
--- 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 d94b915da419c3ad0a1f9622ca134947fd414041..8b82e4c93dfa7e89127bce74cde76d6219ad5379 100644 (file)
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -2407,6 +2407,14 @@ 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);