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Wed, 12 Oct 2022 16:21:16 +0000 (GMT) Received: from li-c6ac47cc-293c-11b2-a85c-d421c8e4747b.ibm.com.com (unknown [9.171.34.168]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 12 Oct 2022 16:21:16 +0000 (GMT) From: Pierre Morel To: qemu-s390x@nongnu.org Cc: qemu-devel@nongnu.org, borntraeger@de.ibm.com, pasic@linux.ibm.com, richard.henderson@linaro.org, david@redhat.com, thuth@redhat.com, cohuck@redhat.com, mst@redhat.com, pbonzini@redhat.com, kvm@vger.kernel.org, ehabkost@redhat.com, marcel.apfelbaum@gmail.com, eblake@redhat.com, armbru@redhat.com, seiden@linux.ibm.com, nrb@linux.ibm.com, frankja@linux.ibm.com, berrange@redhat.com, clg@kaod.org Subject: [PATCH v10 5/9] target/s390x: interception of PTF instruction Date: Wed, 12 Oct 2022 18:21:03 +0200 Message-Id: <20221012162107.91734-6-pmorel@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221012162107.91734-1-pmorel@linux.ibm.com> References: <20221012162107.91734-1-pmorel@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: q6kJLvGq-aqubYddZ78QdAkvliAQ22eX X-Proofpoint-ORIG-GUID: 0Ety_OE7ljCd2VkisxMr1BTj81xzYPi3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-12_07,2022-10-12_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 mlxscore=0 spamscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 impostorscore=0 clxscore=1015 bulkscore=0 suspectscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210120106 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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 Reviewed-by: Janis Schoetterl-Glausch --- include/hw/s390x/s390-virtio-ccw.h | 6 ++++ hw/s390x/cpu-topology.c | 52 ++++++++++++++++++++++++++++++ target/s390x/kvm/kvm.c | 11 +++++++ 3 files changed, 69 insertions(+) diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h index 8a0090a071..9e7a0d75bc 100644 --- a/include/hw/s390x/s390-virtio-ccw.h +++ b/include/hw/s390x/s390-virtio-ccw.h @@ -31,6 +31,12 @@ 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 +void s390_handle_ptf(S390CPU *cpu, uint8_t r1, uintptr_t ra); + struct S390CcwMachineClass { /*< private >*/ MachineClass parent_class; diff --git a/hw/s390x/cpu-topology.c b/hw/s390x/cpu-topology.c index 349f0ad89d..2ad516a97d 100644 --- a/hw/s390x/cpu-topology.c +++ b/hw/s390x/cpu-topology.c @@ -20,6 +20,58 @@ #include "hw/s390x/s390-virtio-ccw.h" #include "hw/s390x/cpu-topology.h" #include "migration/vmstate.h" +#include "target/s390x/cpu.h" +#include "hw/s390x/s390-virtio-ccw.h" + +/* + * s390_handle_ptf: + * + * @register 1: contains the function code + * + * Function codes 0 and 1 handle the CPU polarization. + * We assume an horizontal topology, the only one supported currently + * by Linux, consequently we answer to function code 0, requesting + * horizontal polarization that it is already the current polarization + * and reject vertical polarization request without further explanation. + * + * Function code 2 is handling topology changes and is interpreted + * by the SIE. + */ +void 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; + } + + if (env->psw.mask & PSW_MASK_PSTATE) { + s390_program_interrupt(env, PGM_PRIVILEGED, ra); + return; + } + + if (reg & ~S390_TOPO_FC_MASK) { + s390_program_interrupt(env, PGM_SPECIFICATION, ra); + return; + } + + switch (fc) { + case 0: /* Horizontal polarization is already set */ + env->regs[r1] |= S390_PTF_REASON_DONE; + setcc(cpu, 2); + break; + case 1: /* Vertical polarization is not supported */ + env->regs[r1] |= S390_PTF_REASON_NONE; + setcc(cpu, 2); + break; + default: + /* Note that fc == 2 is interpreted by the SIE */ + s390_program_interrupt(env, PGM_SPECIFICATION, ra); + } +} S390Topology *s390_get_topology(void) { diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index 9c994d27d5..49a99931a4 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 @@ -1463,6 +1464,13 @@ static int kvm_mpcifc_service_call(S390CPU *cpu, struct kvm_run *run) } } +static void kvm_handle_ptf(S390CPU *cpu, struct kvm_run *run) +{ + uint8_t r1 = (run->s390_sieic.ipb >> 20) & 0x0f; + + s390_handle_ptf(cpu, r1, RA_IGNORED); +} + static int handle_b9(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1) { int r = 0; @@ -1480,6 +1488,9 @@ 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: + kvm_handle_ptf(cpu, run); + break; case PRIV_B9_EQBS: /* just inject exception */ r = -1; -- 2.31.1