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From ab670456375f0d9b9b2d219fd497d04ec0009e1d Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Fri, 29 May 2020 05:54:16 -0400
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Subject: [PATCH 34/42] s390x: Add unpack facility feature to GA1
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <20200529055420.16855-35-thuth@redhat.com>
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Patchwork-id: 97052
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O-Subject: [RHEL-8.3.0 qemu-kvm PATCH v2 34/38] s390x: Add unpack facility feature to GA1
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Bugzilla: 1828317
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RH-Acked-by: Claudio Imbrenda <cimbrend@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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From: Christian Borntraeger <borntraeger@de.ibm.com>
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The unpack facility is an indication that diagnose 308 subcodes 8-10
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are available to the guest. That means, that the guest can put itself
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into protected mode.
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Once it is in protected mode, the hardware stops any attempt of VM
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introspection by the hypervisor.
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Some features are currently not supported in protected mode:
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* vfio devices
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* Migration
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* Huge page backings
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Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
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Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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Message-Id: <20200319131921.2367-17-frankja@linux.ibm.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 572c0826615737f1c095b1b6d9e381ec40f72eb5)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/s390x/gen-features.c | 1 +
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target/s390x/kvm.c | 8 ++++++++
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2 files changed, 9 insertions(+)
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diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
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index 6278845b12..8ddeebc544 100644
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--- a/target/s390x/gen-features.c
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+++ b/target/s390x/gen-features.c
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@@ -562,6 +562,7 @@ static uint16_t full_GEN15_GA1[] = {
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S390_FEAT_GROUP_MSA_EXT_9,
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S390_FEAT_GROUP_MSA_EXT_9_PCKMO,
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S390_FEAT_ETOKEN,
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+ S390_FEAT_UNPACK,
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};
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/* Default features (in order of release)
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diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
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index 56fe60c49c..84d7cadd09 100644
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--- a/target/s390x/kvm.c
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+++ b/target/s390x/kvm.c
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@@ -2407,6 +2407,14 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
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clear_bit(S390_FEAT_BPB, model->features);
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}
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+ /*
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+ * If we have support for protected virtualization, indicate
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+ * the protected virtualization IPL unpack facility.
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+ */
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+ if (cap_protected) {
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+ set_bit(S390_FEAT_UNPACK, model->features);
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+ }
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+
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/* We emulate a zPCI bus and AEN, therefore we don't need HW support */
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set_bit(S390_FEAT_ZPCI, model->features);
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set_bit(S390_FEAT_ADAPTER_EVENT_NOTIFICATION, model->features);
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--
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2.27.0
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