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Thu, 16 Sep 2021 13:50:56 +0000 (GMT) From: Pierre Morel To: qemu-s390x@nongnu.org Subject: [PATCH v3 2/4] s390x: kvm: topology: interception of PTF instruction Date: Thu, 16 Sep 2021 15:50:52 +0200 Message-Id: <1631800254-25762-3-git-send-email-pmorel@linux.ibm.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1631800254-25762-1-git-send-email-pmorel@linux.ibm.com> References: <1631800254-25762-1-git-send-email-pmorel@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: UdFO8AzXPXIA6iOyshlM8v8CFJVxQ0bR X-Proofpoint-ORIG-GUID: fFN2YAfWgTFyrVWvRIuzR6LCyMfaRUTP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.687,Hydra:6.0.235,FMLib:17.0.607.475 definitions=2020-10-13_15,2020-10-13_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 spamscore=0 mlxlogscore=999 impostorscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 adultscore=0 clxscore=1015 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109160073 Received-SPF: pass client-ip=148.163.156.1; envelope-from=pmorel@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_H3=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, david@redhat.com, cohuck@redhat.com, richard.henderson@linaro.org, qemu-devel@nongnu.org, pasic@linux.ibm.com, borntraeger@de.ibm.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" When the host supports the CPU topology facility, the PTF instruction with function code 2 is interpreted by the SIE, provided that the userland hypervizor activates the interpretation by using the KVM_CAP_S390_CPU_TOPOLOGY KVM extension. The PTF instructions with function code 0 and 1 are intercepted and must be emulated by the userland hypervizor. Signed-off-by: Pierre Morel --- hw/s390x/s390-virtio-ccw.c | 36 ++++++++++++++++++++++++++++++ include/hw/s390x/s390-virtio-ccw.h | 6 +++++ target/s390x/kvm/kvm.c | 15 +++++++++++++ 3 files changed, 57 insertions(+) diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index 61aeccb163..894f013139 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -404,6 +404,42 @@ static void s390_pv_prepare_reset(S390CcwMachineState *ms) s390_pv_prep_reset(); } +int s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra) +{ + CPUS390XState *env = &cpu->env; + uint64_t reg = env->regs[r1]; + uint8_t fc = reg & S390_TOPO_FC_MASK; + + if (!s390_has_feat(S390_FEAT_CONFIGURATION_TOPOLOGY)) { + s390_program_interrupt(env, PGM_OPERATION, ra); + return 0; + } + + if (env->psw.mask & PSW_MASK_PSTATE) { + s390_program_interrupt(env, PGM_PRIVILEGED, ra); + return 0; + } + + if (reg & ~S390_TOPO_FC_MASK) { + s390_program_interrupt(env, PGM_SPECIFICATION, ra); + return 0; + } + + switch (fc) { + case 0: /* Horizontal polarization is already set */ + env->regs[r1] |= S390_PTF_REASON_DONE; + return 2; + case 1: /* Vertical polarization is not supported */ + env->regs[r1] |= S390_PTF_REASON_NONE; + return 2; + default: + /* Note that fc == 2 is interpreted by the SIE */ + s390_program_interrupt(env, PGM_SPECIFICATION, ra); + } + + return 0; +} + static void s390_machine_reset(MachineState *machine) { S390CcwMachineState *ms = S390_CCW_MACHINE(machine); diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h index 3331990e02..ac4b4a92e7 100644 --- a/include/hw/s390x/s390-virtio-ccw.h +++ b/include/hw/s390x/s390-virtio-ccw.h @@ -30,6 +30,12 @@ struct S390CcwMachineState { uint8_t loadparm[8]; }; +#define S390_PTF_REASON_NONE (0x00 << 8) +#define S390_PTF_REASON_DONE (0x01 << 8) +#define S390_PTF_REASON_BUSY (0x02 << 8) +#define S390_TOPO_FC_MASK 0xffUL +int s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra); + struct S390CcwMachineClass { /*< private >*/ MachineClass parent_class; diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index 5b1fdb55c4..dd036961fe 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -97,6 +97,7 @@ #define PRIV_B9_EQBS 0x9c #define PRIV_B9_CLP 0xa0 +#define PRIV_B9_PTF 0xa2 #define PRIV_B9_PCISTG 0xd0 #define PRIV_B9_PCILG 0xd2 #define PRIV_B9_RPCIT 0xd3 @@ -362,6 +363,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) kvm_vm_enable_cap(s, KVM_CAP_S390_USER_SIGP, 0); kvm_vm_enable_cap(s, KVM_CAP_S390_VECTOR_REGISTERS, 0); kvm_vm_enable_cap(s, KVM_CAP_S390_USER_STSI, 0); + kvm_vm_enable_cap(s, KVM_CAP_S390_CPU_TOPOLOGY, 0); if (ri_allowed()) { if (kvm_vm_enable_cap(s, KVM_CAP_S390_RI, 0) == 0) { cap_ri = 1; @@ -1452,6 +1454,16 @@ static int kvm_mpcifc_service_call(S390CPU *cpu, struct kvm_run *run) } } +static int kvm_handle_ptf(S390CPU *cpu, struct kvm_run *run) +{ + uint8_t r1 = (run->s390_sieic.ipb >> 20) & 0x0f; + int ret; + + ret = s390_handle_ptf(cpu, r1, RA_IGNORED); + setcc(cpu, ret); + return 0; +} + static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1) { int r = 0; @@ -1469,6 +1481,9 @@ static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1) case PRIV_B9_RPCIT: r = kvm_rpcit_service_call(cpu, run); break; + case PRIV_B9_PTF: + r = kvm_handle_ptf(cpu, run); + break; case PRIV_B9_EQBS: /* just inject exception */ r = -1;