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From ad53e96559cfe9d5f1b5518c3c925618e7e1bcc7 Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Wed, 18 Sep 2019 14:35:49 +0100
Subject: [PATCH 10/22] s390x/cpumodel: Set up CPU model for AQIC interception

RH-Author: Thomas Huth <thuth@redhat.com>
Message-id: <20190918143549.16340-3-thuth@redhat.com>
Patchwork-id: 90760
O-Subject: [RHEL-8.2.0 qemu-kvm PATCH 2/2] s390x/cpumodel: Set up CPU model for AQIC interception
Bugzilla: 1660909
RH-Acked-by: David Hildenbrand <david@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Jens Freimann <jfreimann@redhat.com>

From: Pierre Morel <pmorel@linux.ibm.com>

Let's add support for the AP-Queue interruption facility to the CPU
model.

The S390_FEAT_AP_QUEUE_INTERRUPT_CONTROL, CPU facility indicates
whether the PQAP instruction with the AQIC command is available
to the guest.
This feature will be enabled only if the AP instructions are
available on the linux host and AQIC facility is installed on
the host.

This feature must be turned on from userspace to intercept AP
instructions on the KVM guest. The QEMU command line to turn
this feature on looks something like this:

    qemu-system-s390x ... -cpu xxx,apqi=on ...
or
    ... -cpu host

Right now AP pass-through devices do not support migration,
which means that we do not have to take care of migrating
the interrupt data:
virsh migrate apguest --live qemu+ssh://root@target.lan/system
error: Requested operation is not valid: domain has assigned non-USB host devices

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
[rebase to newest qemu and fixup description]
Message-Id: <20190705153249.12525-1-borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit 9ef2d19e5f5dfdebc9877c77951c28f25c74e000)

Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 target/s390x/cpu_features_def.inc.h | 1 +
 target/s390x/cpu_models.c           | 1 +
 target/s390x/gen-features.c         | 1 +
 3 files changed, 3 insertions(+)

diff --git a/target/s390x/cpu_features_def.inc.h b/target/s390x/cpu_features_def.inc.h
index 011ce4d..dead061 100644
--- a/target/s390x/cpu_features_def.inc.h
+++ b/target/s390x/cpu_features_def.inc.h
@@ -77,6 +77,7 @@ DEF_FEAT(SEMAPHORE_ASSIST, "sema", STFL, 59, "Semaphore-assist facility")
 DEF_FEAT(TIME_SLICE_INSTRUMENTATION, "tsi", STFL, 60, "Time-slice Instrumentation facility")
 DEF_FEAT(MISC_INSTRUCTION_EXT3, "minste3", STFL, 61, "Miscellaneous-Instruction-Extensions Facility 3")
 DEF_FEAT(RUNTIME_INSTRUMENTATION, "ri", STFL, 64, "CPU runtime-instrumentation facility")
+DEF_FEAT(AP_QUEUE_INTERRUPT_CONTROL, "apqi", STFL, 65, "AP-Queue interruption facility")
 DEF_FEAT(ZPCI, "zpci", STFL, 69, "z/PCI facility")
 DEF_FEAT(ADAPTER_EVENT_NOTIFICATION, "aen", STFL, 71, "General-purpose-adapter-event-notification facility")
 DEF_FEAT(ADAPTER_INT_SUPPRESSION, "ais", STFL, 72, "General-purpose-adapter-interruption-suppression facility")
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index 91afc6b..f16ef64 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -792,6 +792,7 @@ static void check_consistency(const S390CPUModel *model)
         { S390_FEAT_PTFF_QTOUE, S390_FEAT_MULTIPLE_EPOCH },
         { S390_FEAT_PTFF_STOE, S390_FEAT_MULTIPLE_EPOCH },
         { S390_FEAT_PTFF_STOUE, S390_FEAT_MULTIPLE_EPOCH },
+        { S390_FEAT_AP_QUEUE_INTERRUPT_CONTROL, S390_FEAT_AP },
     };
     int i;
 
diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
index 24d78e9..17bb04e 100644
--- a/target/s390x/gen-features.c
+++ b/target/s390x/gen-features.c
@@ -519,6 +519,7 @@ static uint16_t full_GEN12_GA1[] = {
     S390_FEAT_EDAT_2,
     S390_FEAT_SIDE_EFFECT_ACCESS_ESOP2,
     S390_FEAT_AP_QUERY_CONFIG_INFO,
+    S390_FEAT_AP_QUEUE_INTERRUPT_CONTROL,
     S390_FEAT_AP_FACILITIES_TEST,
     S390_FEAT_AP,
 };
-- 
1.8.3.1