qemu/s390x-Add-unpack-facility-feature-to-GA1.patch

From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Tue, 25 Feb 2020 06:28:51 -0500
Subject: s390x: Add unpack facility feature to GA1

Git-commit: 3034eaac3b2970ba85a1d77814ceef1352d05357
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>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 target/s390x/gen-features.c | 1 +
 target/s390x/kvm.c          | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
index 6278845b12b8dee84c086413c60a..8ddeebc54419a3e2481e21916389 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 870dd1b52b6e424f6cbd751cce0d..69881a0da0b31f72c4c3794d17ab 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -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);