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Wed, 12 Jun 2019 09:21:18 +0000 Received: from b01ledav002.gho.pok.ibm.com (b01ledav002.gho.pok.ibm.com [9.57.199.107]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x5C9LGM526345778 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 12 Jun 2019 09:21:16 GMT Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CF2B112405A; Wed, 12 Jun 2019 09:21:15 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F13BE124053; Wed, 12 Jun 2019 09:21:13 +0000 (GMT) Received: from [127.0.1.1] (unknown [9.124.31.35]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 12 Jun 2019 09:21:13 +0000 (GMT) From: Aravinda Prasad To: aik@au1.ibm.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org, david@gibson.dropbear.id.au Date: Wed, 12 Jun 2019 14:51:13 +0530 Message-ID: <156033127298.26635.17253629451311229799.stgit@aravinda> In-Reply-To: <156033104292.26635.15759339817253067370.stgit@aravinda> References: <156033104292.26635.15759339817253067370.stgit@aravinda> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-06-12_05:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906120064 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH v10 3/6] target/ppc: Handle NMI guest exit 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: paulus@ozlabs.org, aravinda@linux.vnet.ibm.com, groug@kaod.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Memory error such as bit flips that cannot be corrected by hardware are passed on to the kernel for handling. If the memory address in error belongs to guest then the guest kernel is responsible for taking suitable action. Patch [1] enhances KVM to exit guest with exit reason set to KVM_EXIT_NMI in such cases. This patch handles KVM_EXIT_NMI exit. [1] https://www.spinics.net/lists/kvm-ppc/msg12637.html (e20bbd3d and related commits) Signed-off-by: Aravinda Prasad Reviewed-by: David Gibson --- hw/ppc/spapr.c | 8 ++++++++ hw/ppc/spapr_events.c | 23 +++++++++++++++++++++++ include/hw/ppc/spapr.h | 10 ++++++++++ target/ppc/kvm.c | 14 ++++++++++++++ target/ppc/kvm_ppc.h | 2 ++ target/ppc/trace-events | 1 + 6 files changed, 58 insertions(+) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 2ef86aa..6cc2c3b 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1806,6 +1806,12 @@ static void spapr_machine_reset(void) first_ppc_cpu->env.gpr[5] =3D 0; =20 spapr->cas_reboot =3D false; + + spapr->mc_status =3D -1; + spapr->guest_machine_check_addr =3D -1; + + /* Signal all vCPUs waiting on this condition */ + qemu_cond_broadcast(&spapr->mc_delivery_cond); } =20 static void spapr_create_nvram(SpaprMachineState *spapr) @@ -3070,6 +3076,8 @@ static void spapr_machine_init(MachineState *machine) =20 kvmppc_spapr_enable_inkernel_multitce(); } + + qemu_cond_init(&spapr->mc_delivery_cond); } =20 static int spapr_kvm_type(MachineState *machine, const char *vm_type) diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c index ae0f093..a0c66d7 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -620,6 +620,29 @@ void spapr_hotplug_req_remove_by_count_indexed(SpaprDr= cType drc_type, RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, &drc_i= d); } =20 +void spapr_mce_req_event(PowerPCCPU *cpu) +{ + SpaprMachineState *spapr =3D SPAPR_MACHINE(qdev_get_machine()); + + while (spapr->mc_status !=3D -1) { + /* + * Check whether the same CPU got machine check error + * while still handling the mc error (i.e., before + * that CPU called "ibm,nmi-interlock") + */ + if (spapr->mc_status =3D=3D cpu->vcpu_id) { + qemu_system_guest_panicked(NULL); + return; + } + qemu_cond_wait_iothread(&spapr->mc_delivery_cond); + /* Meanwhile if the system is reset, then just return */ + if (spapr->guest_machine_check_addr =3D=3D -1) { + return; + } + } + spapr->mc_status =3D cpu->vcpu_id; +} + static void check_exception(PowerPCCPU *cpu, SpaprMachineState *spapr, uint32_t token, uint32_t nargs, target_ulong args, diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index f891f8f..f34c79f 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -190,6 +190,15 @@ struct SpaprMachineState { * occurs during the unplug process. */ QTAILQ_HEAD(, SpaprDimmState) pending_dimm_unplugs; =20 + /* State related to "ibm,nmi-register" and "ibm,nmi-interlock" calls */ + target_ulong guest_machine_check_addr; + /* + * mc_status is set to -1 if mc is not in progress, else is set to the= CPU + * handling the mc. + */ + int mc_status; + QemuCond mc_delivery_cond; + /*< public >*/ char *kvm_type; char *host_model; @@ -789,6 +798,7 @@ void spapr_clear_pending_events(SpaprMachineState *spap= r); int spapr_max_server_number(SpaprMachineState *spapr); void spapr_store_hpte(PowerPCCPU *cpu, hwaddr ptex, uint64_t pte0, uint64_t pte1); +void spapr_mce_req_event(PowerPCCPU *cpu); =20 /* DRC callbacks. */ void spapr_core_release(DeviceState *dev); diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c index afef4cd..99f33fe 100644 --- a/target/ppc/kvm.c +++ b/target/ppc/kvm.c @@ -1763,6 +1763,11 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_ru= n *run) ret =3D 0; break; =20 + case KVM_EXIT_NMI: + trace_kvm_handle_nmi_exception(); + ret =3D kvm_handle_nmi(cpu, run); + break; + default: fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason); ret =3D -1; @@ -2863,6 +2868,15 @@ int kvm_arch_msi_data_to_gsi(uint32_t data) return data & 0xffff; } =20 +int kvm_handle_nmi(PowerPCCPU *cpu, struct kvm_run *run) +{ + cpu_synchronize_state(CPU(cpu)); + + spapr_mce_req_event(cpu); + + return 0; +} + int kvmppc_enable_hwrng(void) { if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_PPC_HWRN= G)) { diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h index 880cee9..3d9f0b4 100644 --- a/target/ppc/kvm_ppc.h +++ b/target/ppc/kvm_ppc.h @@ -83,6 +83,8 @@ bool kvmppc_hpt_needs_host_contiguous_pages(void); void kvm_check_mmu(PowerPCCPU *cpu, Error **errp); void kvmppc_set_reg_ppc_online(PowerPCCPU *cpu, unsigned int online); =20 +int kvm_handle_nmi(PowerPCCPU *cpu, struct kvm_run *run); + #else =20 static inline uint32_t kvmppc_get_tbfreq(void) diff --git a/target/ppc/trace-events b/target/ppc/trace-events index 3dc6740..6d15aa9 100644 --- a/target/ppc/trace-events +++ b/target/ppc/trace-events @@ -28,3 +28,4 @@ kvm_handle_papr_hcall(void) "handle PAPR hypercall" kvm_handle_epr(void) "handle epr" kvm_handle_watchdog_expiry(void) "handle watchdog expiry" kvm_handle_debug_exception(void) "handle debug exception" +kvm_handle_nmi_exception(void) "handle NMI exception"