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From 89c813343ab05381d7def3b67120a4480490add7 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Mon, 15 Oct 2018 10:19:28 +0100
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Subject: [PATCH 3/6] s390x/kvm: enable AP instruction interpretation for guest
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <1539598771-16223-4-git-send-email-thuth@redhat.com>
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Patchwork-id: 82697
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O-Subject: [RHEL-8 qemu-kvm PATCH 3/6] s390x/kvm: enable AP instruction interpretation for guest
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Bugzilla: 1508142
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Jens Freimann <jfreimann@redhat.com>
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From: Tony Krowiak <akrowiak@linux.ibm.com>
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Let's use the KVM_SET_DEVICE_ATTR ioctl to enable hardware
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interpretation of AP instructions executed on the guest.
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If the S390_FEAT_AP feature is switched on for the guest,
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AP instructions must be interpreted by default; otherwise,
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they will be intercepted.
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This attribute setting may be overridden by a device. For example,
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a device may want to provide AP instructions to the guest (i.e.,
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S390_FEAT_AP turned on), but it may want to emulate them. In this
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case, the AP instructions executed on the guest must be
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intercepted; so when the device is realized, it must disable
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interpretation.
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Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
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Tested-by: Pierre Morel <pmorel@linux.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Acked-by: Halil Pasic <pasic@linux.ibm.com>
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Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Message-Id: <20181010170309.12045-4-akrowiak@linux.ibm.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 1d7db85b61cb9888b8ed8c8923343b468405b7a0)
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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/kvm.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
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index 2a63499..4cb3499 100644
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--- a/target/s390x/kvm.c
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+++ b/target/s390x/kvm.c
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@@ -2298,11 +2298,26 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
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error_setg(errp, "KVM: host CPU model could not be identified");
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return;
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}
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+ /* for now, we can only provide the AP feature with HW support */
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+ if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO,
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+ KVM_S390_VM_CRYPTO_ENABLE_APIE)) {
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+ set_bit(S390_FEAT_AP, model->features);
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+ }
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/* strip of features that are not part of the maximum model */
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bitmap_and(model->features, model->features, model->def->full_feat,
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S390_FEAT_MAX);
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}
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+static void kvm_s390_configure_apie(bool interpret)
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+{
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+ uint64_t attr = interpret ? KVM_S390_VM_CRYPTO_ENABLE_APIE :
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+ KVM_S390_VM_CRYPTO_DISABLE_APIE;
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+
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+ if (kvm_vm_check_attr(kvm_state, KVM_S390_VM_CRYPTO, attr)) {
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+ kvm_s390_set_attr(attr);
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+ }
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+}
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+
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void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp)
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{
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struct kvm_s390_vm_cpu_processor prop = {
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@@ -2360,6 +2375,10 @@ void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp)
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if (test_bit(S390_FEAT_CMM, model->features)) {
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kvm_s390_enable_cmma();
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}
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+
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+ if (test_bit(S390_FEAT_AP, model->features)) {
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+ kvm_s390_configure_apie(true);
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+ }
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}
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void kvm_s390_restart_interrupt(S390CPU *cpu)
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--
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1.8.3.1
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