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Wed, 25 Sep 2019 06:01:33 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8067B221C; Wed, 25 Sep 2019 06:01:31 +0000 (GMT) Received: from [9.124.31.203] (unknown [9.124.31.203]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 25 Sep 2019 06:01:31 +0000 (GMT) Subject: Re: [PATCH v14 4/7] target/ppc: Build rtas error log upon an MCE To: David Gibson References: <156879398718.18368.17640174821710157715.stgit@aravinda> <156879435456.18368.1144480383769624512.stgit@aravinda> <20190925013052.GG17405@umbus> From: Aravinda Prasad Message-ID: <3282d800-46d5-d270-542c-bcf8bd937944@linux.vnet.ibm.com> Date: Wed, 25 Sep 2019 11:31:30 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20190925013052.GG17405@umbus> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-09-25_04:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 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=8.0.1-1908290000 definitions=main-1909250061 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 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: aik@ozlabs.ru, qemu-devel@nongnu.org, groug@kaod.org, paulus@ozlabs.org, qemu-ppc@nongnu.org, ganeshgr@linux.ibm.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wednesday 25 September 2019 07:00 AM, David Gibson wrote: > On Wed, Sep 18, 2019 at 01:42:34PM +0530, Aravinda Prasad wrote: >> Upon a machine check exception (MCE) in a guest address space, >> KVM causes a guest exit to enable QEMU to build and pass the >> error to the guest in the PAPR defined rtas error log format. >> >> This patch builds the rtas error log, copies it to the rtas_addr >> and then invokes the guest registered machine check handler. The >> handler in the guest takes suitable action(s) depending on the type >> and criticality of the error. For example, if an error is >> unrecoverable memory corruption in an application inside the >> guest, then the guest kernel sends a SIGBUS to the application. >> For recoverable errors, the guest performs recovery actions and >> logs the error. >> >> Signed-off-by: Aravinda Prasad >> --- >> hw/ppc/spapr.c | 13 +++ >> hw/ppc/spapr_events.c | 222 ++++++++++++++++++++++++++++++++++++++++++++++++ >> hw/ppc/spapr_rtas.c | 26 ++++++ >> include/hw/ppc/spapr.h | 6 + >> target/ppc/kvm.c | 4 + >> 5 files changed, 268 insertions(+), 3 deletions(-) >> >> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c >> index 76ed988..9f2e5d2 100644 >> --- a/hw/ppc/spapr.c >> +++ b/hw/ppc/spapr.c >> @@ -2930,6 +2930,19 @@ static void spapr_machine_init(MachineState *machine) >> error_report("Could not get size of LPAR rtas '%s'", filename); >> exit(1); >> } >> + >> + if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI_MCE) == SPAPR_CAP_ON) { >> + /* >> + * Ensure that the rtas image size is less than RTAS_ERROR_LOG_OFFSET >> + * or else the rtas image will be overwritten with the rtas error log >> + * when a machine check exception is encountered. >> + */ >> + g_assert(spapr->rtas_size < RTAS_ERROR_LOG_OFFSET); >> + >> + /* Resize rtas blob to accommodate error log */ >> + spapr->rtas_size = RTAS_ERROR_LOG_MAX; >> + } >> + > > I've recently merged into ppc-for-4.2 the change to have SLOF supply > the RTAS blob, rather than qemu. So this code will need to be updated > accordingly. Sure. Will modify it to check if rtas_size is set to RTAS_ERROR_LOG_MAX instead of the assignment. > >> spapr->rtas_blob = g_malloc(spapr->rtas_size); >> if (load_image_size(filename, spapr->rtas_blob, spapr->rtas_size) < 0) { >> error_report("Could not load LPAR rtas '%s'", filename); >> diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c >> index 0ce96b8..ecc3d68 100644 >> --- a/hw/ppc/spapr_events.c >> +++ b/hw/ppc/spapr_events.c >> @@ -214,6 +214,106 @@ struct hp_extended_log { >> struct rtas_event_log_v6_hp hp; >> } QEMU_PACKED; >> >> +struct rtas_event_log_v6_mc { >> +#define RTAS_LOG_V6_SECTION_ID_MC 0x4D43 /* MC */ >> + struct rtas_event_log_v6_section_header hdr; >> + uint32_t fru_id; >> + uint32_t proc_id; >> + uint8_t error_type; >> +#define RTAS_LOG_V6_MC_TYPE_UE 0 >> +#define RTAS_LOG_V6_MC_TYPE_SLB 1 >> +#define RTAS_LOG_V6_MC_TYPE_ERAT 2 >> +#define RTAS_LOG_V6_MC_TYPE_TLB 4 >> +#define RTAS_LOG_V6_MC_TYPE_D_CACHE 5 >> +#define RTAS_LOG_V6_MC_TYPE_I_CACHE 7 >> + uint8_t sub_err_type; >> +#define RTAS_LOG_V6_MC_UE_INDETERMINATE 0 >> +#define RTAS_LOG_V6_MC_UE_IFETCH 1 >> +#define RTAS_LOG_V6_MC_UE_PAGE_TABLE_WALK_IFETCH 2 >> +#define RTAS_LOG_V6_MC_UE_LOAD_STORE 3 >> +#define RTAS_LOG_V6_MC_UE_PAGE_TABLE_WALK_LOAD_STORE 4 >> +#define RTAS_LOG_V6_MC_SLB_PARITY 0 >> +#define RTAS_LOG_V6_MC_SLB_MULTIHIT 1 >> +#define RTAS_LOG_V6_MC_SLB_INDETERMINATE 2 >> +#define RTAS_LOG_V6_MC_ERAT_PARITY 1 >> +#define RTAS_LOG_V6_MC_ERAT_MULTIHIT 2 >> +#define RTAS_LOG_V6_MC_ERAT_INDETERMINATE 3 >> +#define RTAS_LOG_V6_MC_TLB_PARITY 1 >> +#define RTAS_LOG_V6_MC_TLB_MULTIHIT 2 >> +#define RTAS_LOG_V6_MC_TLB_INDETERMINATE 3 >> + uint8_t reserved_1[6]; >> + uint64_t effective_address; >> + uint64_t logical_address; >> +} QEMU_PACKED; >> + >> +struct mc_extended_log { >> + struct rtas_event_log_v6 v6hdr; >> + struct rtas_event_log_v6_mc mc; >> +} QEMU_PACKED; >> + >> +struct MC_ierror_table { >> + unsigned long srr1_mask; >> + unsigned long srr1_value; >> + bool nip_valid; /* nip is a valid indicator of faulting address */ >> + uint8_t error_type; >> + uint8_t error_subtype; >> + unsigned int initiator; >> + unsigned int severity; >> +}; >> + >> +static const struct MC_ierror_table mc_ierror_table[] = { >> +{ 0x00000000081c0000, 0x0000000000040000, true, >> + RTAS_LOG_V6_MC_TYPE_UE, RTAS_LOG_V6_MC_UE_IFETCH, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000000081c0000, 0x0000000000080000, true, >> + RTAS_LOG_V6_MC_TYPE_SLB, RTAS_LOG_V6_MC_SLB_PARITY, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000000081c0000, 0x00000000000c0000, true, >> + RTAS_LOG_V6_MC_TYPE_SLB, RTAS_LOG_V6_MC_SLB_MULTIHIT, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000000081c0000, 0x0000000000100000, true, >> + RTAS_LOG_V6_MC_TYPE_ERAT, RTAS_LOG_V6_MC_ERAT_MULTIHIT, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000000081c0000, 0x0000000000140000, true, >> + RTAS_LOG_V6_MC_TYPE_TLB, RTAS_LOG_V6_MC_TLB_MULTIHIT, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000000081c0000, 0x0000000000180000, true, >> + RTAS_LOG_V6_MC_TYPE_UE, RTAS_LOG_V6_MC_UE_PAGE_TABLE_WALK_IFETCH, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0, 0, 0, 0, 0, 0 } }; > > For constant tables like this using ARRAY_SIZE() is preferred to > having sentinal records at the end. ok > >> + >> +struct MC_derror_table { >> + unsigned long dsisr_value; >> + bool dar_valid; /* dar is a valid indicator of faulting address */ >> + uint8_t error_type; >> + uint8_t error_subtype; >> + unsigned int initiator; >> + unsigned int severity; >> +}; >> + >> +static const struct MC_derror_table mc_derror_table[] = { >> +{ 0x00008000, false, >> + RTAS_LOG_V6_MC_TYPE_UE, RTAS_LOG_V6_MC_UE_LOAD_STORE, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00004000, true, >> + RTAS_LOG_V6_MC_TYPE_UE, RTAS_LOG_V6_MC_UE_PAGE_TABLE_WALK_LOAD_STORE, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000800, true, >> + RTAS_LOG_V6_MC_TYPE_ERAT, RTAS_LOG_V6_MC_ERAT_MULTIHIT, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000400, true, >> + RTAS_LOG_V6_MC_TYPE_TLB, RTAS_LOG_V6_MC_TLB_MULTIHIT, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000080, true, >> + RTAS_LOG_V6_MC_TYPE_SLB, RTAS_LOG_V6_MC_SLB_MULTIHIT, /* Before PARITY */ >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0x00000100, true, >> + RTAS_LOG_V6_MC_TYPE_SLB, RTAS_LOG_V6_MC_SLB_PARITY, >> + RTAS_LOG_INITIATOR_CPU, RTAS_LOG_SEVERITY_ERROR_SYNC, }, >> +{ 0, false, 0, 0, 0, 0 } }; >> + >> +#define SRR1_MC_LOADSTORE(srr1) ((srr1) & PPC_BIT(42)) >> + >> typedef enum EventClass { >> EVENT_CLASS_INTERNAL_ERRORS = 0, >> EVENT_CLASS_EPOW = 1, >> @@ -622,7 +722,125 @@ void spapr_hotplug_req_remove_by_count_indexed(SpaprDrcType drc_type, >> RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, &drc_id); >> } >> >> -void spapr_mce_req_event(PowerPCCPU *cpu) >> +static uint32_t spapr_mce_get_elog_type(PowerPCCPU *cpu, bool recovered, >> + struct mc_extended_log *ext_elog) >> +{ >> + int i; >> + CPUPPCState *env = &cpu->env; >> + uint32_t summary; >> + uint64_t dsisr = env->spr[SPR_DSISR]; >> + >> + summary = RTAS_LOG_VERSION_6 | RTAS_LOG_OPTIONAL_PART_PRESENT; >> + if (recovered) { >> + summary |= RTAS_LOG_DISPOSITION_FULLY_RECOVERED; >> + } else { >> + summary |= RTAS_LOG_DISPOSITION_NOT_RECOVERED; >> + } >> + >> + if (SRR1_MC_LOADSTORE(env->spr[SPR_SRR1])) { >> + for (i = 0; mc_derror_table[i].dsisr_value; i++) { >> + if (!(dsisr & mc_derror_table[i].dsisr_value)) { >> + continue; >> + } >> + >> + ext_elog->mc.error_type = mc_derror_table[i].error_type; >> + ext_elog->mc.sub_err_type = mc_derror_table[i].error_subtype; >> + if (mc_derror_table[i].dar_valid) { >> + ext_elog->mc.effective_address = cpu_to_be64(env->spr[SPR_DAR]); >> + } >> + >> + summary |= mc_derror_table[i].initiator >> + | mc_derror_table[i].severity; >> + >> + return summary; >> + } >> + } else { >> + for (i = 0; mc_ierror_table[i].srr1_mask; i++) { >> + if ((env->spr[SPR_SRR1] & mc_ierror_table[i].srr1_mask) != >> + mc_ierror_table[i].srr1_value) { >> + continue; >> + } >> + >> + ext_elog->mc.error_type = mc_ierror_table[i].error_type; >> + ext_elog->mc.sub_err_type = mc_ierror_table[i].error_subtype; >> + if (mc_ierror_table[i].nip_valid) { >> + ext_elog->mc.effective_address = cpu_to_be64(env->nip); >> + } >> + >> + summary |= mc_ierror_table[i].initiator >> + | mc_ierror_table[i].severity; >> + >> + return summary; >> + } >> + } >> + >> + summary |= RTAS_LOG_INITIATOR_CPU; >> + return summary; >> +} >> + >> +static void spapr_mce_dispatch_elog(PowerPCCPU *cpu, bool recovered) >> +{ >> + SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); >> + CPUState *cs = CPU(cpu); >> + uint64_t rtas_addr; >> + CPUPPCState *env = &cpu->env; >> + PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); >> + target_ulong msr = 0; >> + struct rtas_error_log log; >> + struct mc_extended_log *ext_elog; >> + uint32_t summary; >> + >> + /* >> + * Properly set bits in MSR before we invoke the handler. >> + * SRR0/1, DAR and DSISR are properly set by KVM >> + */ >> + if (!(*pcc->interrupts_big_endian)(cpu)) { >> + msr |= (1ULL << MSR_LE); >> + } >> + >> + if (env->msr & (1ULL << MSR_SF)) { >> + msr |= (1ULL << MSR_SF); >> + } >> + >> + msr |= (1ULL << MSR_ME); >> + >> + ext_elog = g_malloc0(sizeof(*ext_elog)); > > g_new0() is preferred for this sort of thing. I feel g_malloc0() is used to allocate extended logs in other places in this file, so I think g_malloc0() should be fine. Please let me know. > >> + summary = spapr_mce_get_elog_type(cpu, recovered, ext_elog); >> + >> + log.summary = cpu_to_be32(summary); >> + log.extended_length = cpu_to_be32(sizeof(*ext_elog)); >> + >> + spapr_init_v6hdr(&ext_elog->v6hdr); >> + ext_elog->mc.hdr.section_id = cpu_to_be16(RTAS_LOG_V6_SECTION_ID_MC); >> + ext_elog->mc.hdr.section_length = >> + cpu_to_be16(sizeof(struct rtas_event_log_v6_mc)); >> + ext_elog->mc.hdr.section_version = 1; >> + >> + /* get rtas addr from fdt */ >> + rtas_addr = spapr_get_rtas_addr(); >> + if (!rtas_addr) { >> + /* Unable to fetch rtas_addr. Hence reset the guest */ >> + ppc_cpu_do_system_reset(cs); >> + g_free(ext_elog); >> + return; >> + } >> + >> + stq_be_phys(&address_space_memory, rtas_addr + RTAS_ERROR_LOG_OFFSET, >> + env->gpr[3]); >> + cpu_physical_memory_write(rtas_addr + RTAS_ERROR_LOG_OFFSET + >> + sizeof(env->gpr[3]), &log, sizeof(log)); >> + cpu_physical_memory_write(rtas_addr + RTAS_ERROR_LOG_OFFSET + >> + sizeof(env->gpr[3]) + sizeof(log), ext_elog, >> + sizeof(*ext_elog)); >> + >> + env->gpr[3] = rtas_addr + RTAS_ERROR_LOG_OFFSET; >> + env->msr = msr; >> + env->nip = spapr->guest_machine_check_addr; >> + >> + g_free(ext_elog); >> +} >> + >> +void spapr_mce_req_event(PowerPCCPU *cpu, bool recovered) >> { >> SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); >> CPUState *cs = CPU(cpu); >> @@ -656,6 +874,8 @@ void spapr_mce_req_event(PowerPCCPU *cpu) >> } >> } >> spapr->mc_status = cpu->vcpu_id; >> + >> + spapr_mce_dispatch_elog(cpu, recovered); >> } >> >> static void check_exception(PowerPCCPU *cpu, SpaprMachineState *spapr, >> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c >> index bee3835..d8fb8a8 100644 >> --- a/hw/ppc/spapr_rtas.c >> +++ b/hw/ppc/spapr_rtas.c >> @@ -518,6 +518,32 @@ void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr) >> } >> } >> >> +hwaddr spapr_get_rtas_addr(void) >> +{ >> + SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); >> + int rtas_node; >> + const fdt32_t *rtas_data; >> + void *fdt = spapr->fdt_blob; >> + >> + /* fetch rtas addr from fdt */ >> + rtas_node = fdt_path_offset(fdt, "/rtas"); >> + if (rtas_node < 0) { >> + return 0; >> + } >> + >> + rtas_data = fdt_getprop(fdt, rtas_node, "linux,rtas-base", NULL); > > Hrm. Does SLOF actually update the linux,rtas-base property when > instantiate-rtas is called? I think so as I get the updated rtas address when I read it from fdt. Regards, Aravinda > >> + if (!rtas_data) { >> + return 0; >> + } >> + >> + /* >> + * We assume that the OS called RTAS instantiate-rtas, but some other >> + * OS might call RTAS instantiate-rtas-64 instead. This fine as of now >> + * as SLOF only supports 32-bit variant. >> + */ >> + return (hwaddr)fdt32_to_cpu(*rtas_data); >> +} >> + >> static void core_rtas_register_types(void) >> { >> spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", >> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h >> index 99a2966..ffefde7 100644 >> --- a/include/hw/ppc/spapr.h >> +++ b/include/hw/ppc/spapr.h >> @@ -726,6 +726,9 @@ void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr); >> >> #define RTAS_ERROR_LOG_MAX 2048 >> >> +/* Offset from rtas-base where error log is placed */ >> +#define RTAS_ERROR_LOG_OFFSET 0x30 >> + >> #define RTAS_EVENT_SCAN_RATE 1 >> >> /* This helper should be used to encode interrupt specifiers when the related >> @@ -814,7 +817,7 @@ void spapr_clear_pending_events(SpaprMachineState *spapr); >> 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); >> +void spapr_mce_req_event(PowerPCCPU *cpu, bool recovered); >> >> /* DRC callbacks. */ >> void spapr_core_release(DeviceState *dev); >> @@ -904,4 +907,5 @@ void spapr_check_pagesize(SpaprMachineState *spapr, hwaddr pagesize, >> #define SPAPR_OV5_XIVE_BOTH 0x80 /* Only to advertise on the platform */ >> >> void spapr_set_all_lpcrs(target_ulong value, target_ulong mask); >> +hwaddr spapr_get_rtas_addr(void); >> #endif /* HW_SPAPR_H */ >> diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c >> index 1e2a4f1..e9aa95d 100644 >> --- a/target/ppc/kvm.c >> +++ b/target/ppc/kvm.c >> @@ -2818,9 +2818,11 @@ int kvm_arch_msi_data_to_gsi(uint32_t data) >> >> int kvm_handle_nmi(PowerPCCPU *cpu, struct kvm_run *run) >> { >> + bool recovered = run->flags & KVM_RUN_PPC_NMI_DISP_FULLY_RECOV; >> + >> cpu_synchronize_state(CPU(cpu)); >> >> - spapr_mce_req_event(cpu); >> + spapr_mce_req_event(cpu, recovered); >> >> return 0; >> } >> > -- Regards, Aravinda