From 572c0826615737f1c095b1b6d9e381ec40f72eb5 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Thu, 19 Mar 2020 09:19:21 -0400 Subject: 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 Signed-off-by: Janosch Frank Reviewed-by: David Hildenbrand Reviewed-by: Claudio Imbrenda Reviewed-by: Cornelia Huck Message-Id: <20200319131921.2367-17-frankja@linux.ibm.com> Signed-off-by: Cornelia Huck --- 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 6278845b12..8ddeebc544 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 870dd1b52b..69881a0da0 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); -- cgit v1.2.3-55-g7522