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bh=2bNam0apihlcg35S1AG5Yb/HJq4JOsTV3dOKCoiYLFI=; b=TDHkbycTXXsG7f8qRNDrww2N92DqlRClaly0n2KsVhzniJDobokwvVdFYKPSwZwdBwVPi6 GTS8RnoF+m3+YuVKEV9UQT5KPB+v4MLJVLrTdgLTd+djWdqUv8lN9c5LvXHGDPOz6gZ+t7 cxyK7h5Ttzzn+UhFAMVKzVWkZrQCFmw= X-MC-Unique: 5dstlInuNIy0YOBmYtKG0Q-1 From: Thomas Huth To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , qemu-s390x@nongnu.org, Nina Schoetterl-Glausch Subject: [PULL 07/25] s390x/cpu topology: interception of PTF instruction Date: Wed, 18 Oct 2023 15:06:58 +0200 Message-ID: <20231018130716.286638-8-thuth@redhat.com> In-Reply-To: <20231018130716.286638-1-thuth@redhat.com> References: <20231018130716.286638-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1697634977642100007 Content-Type: text/plain; charset="utf-8" From: Pierre Morel When the host supports the CPU topology facility, the PTF instruction with function code 2 is interpreted by the SIE, provided that the userland hypervisor 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 hypervisor. During RESET all CPU of the configuration are placed in horizontal polarity. Signed-off-by: Pierre Morel Reviewed-by: Nina Schoetterl-Glausch Reviewed-by: Thomas Huth Co-developed-by: Nina Schoetterl-Glausch Signed-off-by: Nina Schoetterl-Glausch Message-ID: <20231016183925.2384704-8-nsg@linux.ibm.com> Signed-off-by: Thomas Huth --- include/hw/s390x/s390-virtio-ccw.h | 6 ++++ hw/s390x/cpu-topology.c | 55 ++++++++++++++++++++++++++++++ target/s390x/kvm/kvm.c | 11 ++++++ 3 files changed, 72 insertions(+) diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-vir= tio-ccw.h index 9bba21a916..c1d46e78af 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]; }; =20 +#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 7ec9319272..a00a4ce4df 100644 --- a/hw/s390x/cpu-topology.c +++ b/hw/s390x/cpu-topology.c @@ -90,6 +90,60 @@ static void s390_topology_init(MachineState *ms) smp->books * smp->drawers); } =20 +/* + * s390_handle_ptf: + * + * @register 1: contains the function code + * + * Function codes 0 (horizontal) and 1 (vertical) define the CPU + * polarization requested by the guest. + * + * 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) +{ + CpuS390Polarization polarization; + CPUS390XState *env =3D &cpu->env; + uint64_t reg =3D env->regs[r1]; + int fc =3D 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; + } + + polarization =3D S390_CPU_POLARIZATION_VERTICAL; + switch (fc) { + case 0: + polarization =3D S390_CPU_POLARIZATION_HORIZONTAL; + /* fallthrough */ + case 1: + if (s390_topology.polarization =3D=3D polarization) { + env->regs[r1] |=3D S390_PTF_REASON_DONE; + setcc(cpu, 2); + } else { + s390_topology.polarization =3D polarization; + s390_cpu_topology_set_changed(true); + setcc(cpu, 0); + } + break; + default: + /* Note that fc =3D=3D 2 is interpreted by the SIE */ + s390_program_interrupt(env, PGM_SPECIFICATION, ra); + } +} + /** * s390_topology_reset: * @@ -99,6 +153,7 @@ static void s390_topology_init(MachineState *ms) void s390_topology_reset(void) { s390_cpu_topology_set_changed(false); + s390_topology.polarization =3D S390_CPU_POLARIZATION_HORIZONTAL; } =20 /** diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index d6bda3a2a8..4d84dcc018 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -86,6 +86,7 @@ =20 #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 @@ -1457,6 +1458,13 @@ static int kvm_mpcifc_service_call(S390CPU *cpu, str= uct kvm_run *run) } } =20 +static void kvm_handle_ptf(S390CPU *cpu, struct kvm_run *run) +{ + uint8_t r1 =3D (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 =3D 0; @@ -1474,6 +1482,9 @@ static int handle_b9(S390CPU *cpu, struct kvm_run *ru= n, uint8_t ipa1) case PRIV_B9_RPCIT: r =3D 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 =3D -1; --=20 2.41.0