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From 722078f9fdb766c2f0990145de6732f0c36a63b7 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Wed, 11 Nov 2020 12:03:16 -0500
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Subject: [PATCH 16/18] s390x: pv: Fix diag318 PV fencing
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RH-Author: Thomas Huth <thuth@redhat.com>
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Message-id: <20201111120316.707489-13-thuth@redhat.com>
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Patchwork-id: 99509
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH v2 12/12] s390x: pv: Fix diag318 PV fencing
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Bugzilla: 1798506
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RH-Acked-by: Jens Freimann <jfreimann@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: Janosch Frank <frankja@linux.ibm.com>
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Diag318 fencing needs to be determined on the current VM PV state and
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not on the state that the VM has when we create the CPU model.
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Fixes: fabdada935 ("s390: guest support for diagnose 0x318")
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Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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Tested-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Reviewed-by: Collin Walling <walling@linux.ibm.com>
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Acked-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20201022103135.126033-3-frankja@linux.ibm.com>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 3ded270a2697852a71961b45291519ae044f25e3)
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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/cpu_features.c | 5 +++++
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target/s390x/cpu_features.h | 4 ++++
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target/s390x/cpu_models.c | 4 ++++
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target/s390x/kvm.c | 3 +--
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4 files changed, 14 insertions(+), 2 deletions(-)
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diff --git a/target/s390x/cpu_features.c b/target/s390x/cpu_features.c
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index 9f817e3cfa7..e5cdf232607 100644
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--- a/target/s390x/cpu_features.c
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+++ b/target/s390x/cpu_features.c
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@@ -14,6 +14,7 @@
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#include "qemu/osdep.h"
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#include "qemu/module.h"
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#include "cpu_features.h"
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+#include "hw/s390x/pv.h"
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#define DEF_FEAT(_FEAT, _NAME, _TYPE, _BIT, _DESC) \
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[S390_FEAT_##_FEAT] = { \
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@@ -105,6 +106,10 @@ void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
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}
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feat = find_next_bit(features, S390_FEAT_MAX, feat + 1);
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}
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+
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+ if (type == S390_FEAT_TYPE_SCLP_FAC134 && s390_is_pv()) {
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+ clear_be_bit(s390_feat_def(S390_FEAT_DIAG_318)->bit, data);
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+ }
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}
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void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
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diff --git a/target/s390x/cpu_features.h b/target/s390x/cpu_features.h
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index f74f7fc3a11..d3c685a04c8 100644
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--- a/target/s390x/cpu_features.h
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+++ b/target/s390x/cpu_features.h
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@@ -81,6 +81,10 @@ const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group);
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#define BE_BIT_NR(BIT) (BIT ^ (BITS_PER_LONG - 1))
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+static inline void clear_be_bit(unsigned int bit_nr, uint8_t *array)
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+{
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+ array[bit_nr / 8] &= ~(0x80 >> (bit_nr % 8));
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+}
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static inline void set_be_bit(unsigned int bit_nr, uint8_t *array)
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{
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array[bit_nr / 8] |= 0x80 >> (bit_nr % 8);
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diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
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index bf6a3faba9e..d489923cb8a 100644
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--- a/target/s390x/cpu_models.c
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+++ b/target/s390x/cpu_models.c
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@@ -29,6 +29,7 @@
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#include "hw/pci/pci.h"
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#endif
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#include "qapi/qapi-commands-machine-target.h"
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+#include "hw/s390x/pv.h"
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#define CPUDEF_INIT(_type, _gen, _ec_ga, _mha_pow, _hmfai, _name, _desc) \
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{ \
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@@ -238,6 +239,9 @@ bool s390_has_feat(S390Feat feat)
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}
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return 0;
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}
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+ if (feat == S390_FEAT_DIAG_318 && s390_is_pv()) {
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+ return false;
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+ }
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return test_bit(feat, cpu->model->features);
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}
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diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
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index e5e190d21c9..6edb52f6d25 100644
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--- a/target/s390x/kvm.c
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+++ b/target/s390x/kvm.c
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@@ -2483,8 +2483,7 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
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*/
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set_bit(S390_FEAT_EXTENDED_LENGTH_SCCB, model->features);
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- /* DIAGNOSE 0x318 is not supported under protected virtualization */
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- if (!s390_is_pv() && kvm_check_extension(kvm_state, KVM_CAP_S390_DIAG318)) {
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+ if (kvm_check_extension(kvm_state, KVM_CAP_S390_DIAG318)) {
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set_bit(S390_FEAT_DIAG_318, model->features);
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}
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--
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2.27.0
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