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Fri, 18 Aug 2023 11:15:22 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E2CF420075; Fri, 18 Aug 2023 11:15:21 +0000 (GMT) Received: from a46lp73.lnxne.boe (unknown [9.152.108.100]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 18 Aug 2023 11:15:21 +0000 (GMT) From: Steffen Eiden To: qemu-s390x@nongnu.org, qemu-devel@nongnu.org Cc: Janosch Frank , Thomas Huth , David Hildenbrand , Michael Mueller , Marc Hartmayer , Christian Borntraeger Subject: [PATCH v3 5/5] target/s390x: AP-passthrough for PV guests Date: Fri, 18 Aug 2023 13:15:20 +0200 Message-ID: <20230818111520.698615-6-seiden@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230818111520.698615-1-seiden@linux.ibm.com> References: <20230818111520.698615-1-seiden@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: EZF1fpV6bnHhJ355r-UAA44LKb7U2yGx X-Proofpoint-GUID: afJfEZmOV_9oXfTl9tMBj1LnJTJud4RY X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-18_13,2023-08-18_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 mlxscore=0 mlxlogscore=999 priorityscore=1501 suspectscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 phishscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308180102 Received-SPF: pass client-ip=148.163.156.1; envelope-from=seiden@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Enabling AP-passthrough(AP-pt) for PV-guest by using the new CPU features for PV-AP-pt of KVM. As usual QEMU first checks which CPU features are available and then sets them if available and selected by user. An additional check is done to verify that PV-AP can only be enabled if "regular" AP-pt is enabled as well. Note that KVM itself does not enforce this restriction. Signed-off-by: Steffen Eiden Reviewed-by: Thomas Huth Signed-off-by: Michael Mueller --- target/s390x/cpu_features.h | 1 + target/s390x/cpu_features_def.h.inc | 4 ++ target/s390x/cpu_models.c | 2 + target/s390x/gen-features.c | 2 + target/s390x/kvm/kvm.c | 71 +++++++++++++++++++++++++++++ 5 files changed, 80 insertions(+) diff --git a/target/s390x/cpu_features.h b/target/s390x/cpu_features.h index 87463f064d..a9bd68a2e1 100644 --- a/target/s390x/cpu_features.h +++ b/target/s390x/cpu_features.h @@ -43,6 +43,7 @@ typedef enum { S390_FEAT_TYPE_KDSA, S390_FEAT_TYPE_SORTL, S390_FEAT_TYPE_DFLTCC, + S390_FEAT_TYPE_UV_FEAT_GUEST, } S390FeatType; /* Definition of a CPU feature */ diff --git a/target/s390x/cpu_features_def.h.inc b/target/s390x/cpu_features_def.h.inc index e3cfe63735..e68da9b8ff 100644 --- a/target/s390x/cpu_features_def.h.inc +++ b/target/s390x/cpu_features_def.h.inc @@ -379,3 +379,7 @@ DEF_FEAT(DEFLATE_GHDT, "dfltcc-gdht", DFLTCC, 1, "DFLTCC GDHT") DEF_FEAT(DEFLATE_CMPR, "dfltcc-cmpr", DFLTCC, 2, "DFLTCC CMPR") DEF_FEAT(DEFLATE_XPND, "dfltcc-xpnd", DFLTCC, 4, "DFLTCC XPND") DEF_FEAT(DEFLATE_F0, "dfltcc-f0", DFLTCC, 192, "DFLTCC format 0 parameter-block") + +/* Features exposed via the UV-CALL instruction */ +DEF_FEAT(UV_FEAT_AP, "appv", UV_FEAT_GUEST, 4, "AP instructions installed for secure guests") +DEF_FEAT(UV_FEAT_AP_INTR, "appvi", UV_FEAT_GUEST, 5, "AP instructions interruption support for secure guests") diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c index 42b52afdb4..65331c37a3 100644 --- a/target/s390x/cpu_models.c +++ b/target/s390x/cpu_models.c @@ -483,6 +483,8 @@ static void check_consistency(const S390CPUModel *model) { S390_FEAT_DIAG_318, S390_FEAT_EXTENDED_LENGTH_SCCB }, { S390_FEAT_NNPA, S390_FEAT_VECTOR }, { S390_FEAT_RDP, S390_FEAT_LOCAL_TLB_CLEARING }, + { S390_FEAT_UV_FEAT_AP, S390_FEAT_AP }, + { S390_FEAT_UV_FEAT_AP_INTR, S390_FEAT_UV_FEAT_AP }, }; int i; diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c index 1e3b7c0dc9..2b2bfc3736 100644 --- a/target/s390x/gen-features.c +++ b/target/s390x/gen-features.c @@ -576,6 +576,8 @@ static uint16_t full_GEN16_GA1[] = { S390_FEAT_RDP, S390_FEAT_PAI, S390_FEAT_PAIE, + S390_FEAT_UV_FEAT_AP, + S390_FEAT_UV_FEAT_AP_INTR, }; diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index a7e2cdf668..937387a768 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -2307,6 +2307,42 @@ static bool ap_enabled(const S390FeatBitmap features) return test_bit(S390_FEAT_AP, features); } +static bool uv_feat_supported(void) +{ + return kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL, + KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST); +} + +static int query_uv_feat_guest(S390FeatBitmap features) +{ + struct kvm_s390_vm_cpu_uv_feat prop = {}; + struct kvm_device_attr attr = { + .group = KVM_S390_VM_CPU_MODEL, + .attr = KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST, + .addr = (uint64_t) &prop, + }; + int rc; + + // AP support check is currently the only user of the UV feature test. + if (!(uv_feat_supported() && ap_available())) { + return 0; + } + + rc = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr); + if (rc) { + return rc; + } + + if (prop.ap) { + set_bit(S390_FEAT_UV_FEAT_AP, features); + } + if (prop.ap_intr) { + set_bit(S390_FEAT_UV_FEAT_AP_INTR, features); + } + + return 0; +} + static int kvm_to_feat[][2] = { { KVM_S390_VM_CPU_FEAT_ESOP, S390_FEAT_ESOP }, { KVM_S390_VM_CPU_FEAT_SIEF2, S390_FEAT_SIE_F2 }, @@ -2501,11 +2537,39 @@ void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp) set_bit(S390_FEAT_DIAG_318, model->features); } + /* Test for Ultravisor features that influence secure guest behavior */ + query_uv_feat_guest(model->features); + /* strip of features that are not part of the maximum model */ bitmap_and(model->features, model->features, model->def->full_feat, S390_FEAT_MAX); } +static int configure_uv_feat_guest(const S390FeatBitmap features) +{ + + struct kvm_s390_vm_cpu_uv_feat uv_feat = {}; + struct kvm_device_attr attribute = { + .group = KVM_S390_VM_CPU_MODEL, + .attr = KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST, + .addr = (__u64) &uv_feat, + }; + + // AP support check is currently the only user of the UV feature test. + if (!(uv_feat_supported() && ap_enabled(features))) { + return 0; + } + + if (test_bit(S390_FEAT_UV_FEAT_AP, features)) { + uv_feat.ap = 1; + } + if (test_bit(S390_FEAT_UV_FEAT_AP_INTR, features)) { + uv_feat.ap_intr = 1; + } + + return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attribute); +} + static void kvm_s390_configure_apie(bool interpret) { uint64_t attr = interpret ? KVM_S390_VM_CRYPTO_ENABLE_APIE : @@ -2569,6 +2633,13 @@ void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp) if (ap_enabled(model->features)) { kvm_s390_configure_apie(true); } + + /* configure UV-features for the guest indicated via query / test_bit */ + rc = configure_uv_feat_guest(model->features); + if (rc) { + error_setg(errp, "KVM: Error configuring CPU UV features %d", rc); + return; + } } void kvm_s390_restart_interrupt(S390CPU *cpu)