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Re: [PATCH v17 4/7] target/ppc: Build rtas error log upon an MCE


From: David Gibson
Subject: Re: [PATCH v17 4/7] target/ppc: Build rtas error log upon an MCE
Date: Tue, 19 Nov 2019 12:18:40 +1100
User-agent: Mutt/1.12.1 (2019-06-15)

On Mon, Nov 18, 2019 at 04:39:16PM +0530, Ganesh wrote:
> 
> On 11/6/19 4:37 PM, Ganesh wrote:
> > 
> > On 11/4/19 9:40 PM, David Gibson wrote:
> > > On Thu, Oct 24, 2019 at 01:13:04PM +0530, Ganesh Goudar wrote:
> > > > From: Aravinda Prasad <address@hidden>
> > > > 
> > > > 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.
> > > > 
> > > > [Assume SLOF has allocated enough room for rtas error log]
> > > Is that correct with the SLOF image currently included in qemu?
> > Yes
> > > 
> > > Apart from that detail,
> > > 
> > > Reviewed-by: David Gibson <address@hidden>
> Hi David, Please see if this patch series can be merged to 4.2.

Sorry, we're much too late for 4.2 now.  I am hoping to merge it for
5.0, the next release.

> > > 
> > > > Signed-off-by: Ganesh Goudar <address@hidden>
> > > > Signed-off-by: Aravinda Prasad <address@hidden>
> > > 
> > > 
> > > > ---
> > > >   hw/ppc/spapr_events.c  | 220
> > > > ++++++++++++++++++++++++++++++++++++++++-
> > > >   hw/ppc/spapr_rtas.c    |  26 +++++
> > > >   include/hw/ppc/spapr.h |   6 +-
> > > >   target/ppc/kvm.c       |   4 +-
> > > >   4 files changed, 253 insertions(+), 3 deletions(-)
> > > > 
> > > > diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
> > > > index 0ce96b86be..db44e09154 100644
> > > > --- a/hw/ppc/spapr_events.c
> > > > +++ b/hw/ppc/spapr_events.c
> > > > @@ -214,6 +214,104 @@ 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, } };
> > > > +
> > > > +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, } };
> > > > +
> > > > +#define SRR1_MC_LOADSTORE(srr1) ((srr1) & PPC_BIT(42))
> > > > +
> > > >   typedef enum EventClass {
> > > >       EVENT_CLASS_INTERNAL_ERRORS     = 0,
> > > >       EVENT_CLASS_EPOW                = 1,
> > > > @@ -622,7 +720,125 @@ 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; i < ARRAY_SIZE(mc_derror_table); 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; i < ARRAY_SIZE(mc_ierror_table); 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));
> > > > +    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 +872,8 @@ 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 8d8d8cdfcb..2c066a372d 100644
> > > > --- a/hw/ppc/spapr_rtas.c
> > > > +++ b/hw/ppc/spapr_rtas.c
> > > > @@ -477,6 +477,32 @@ void spapr_dt_rtas_tokens(void *fdt, int rtas)
> > > >       }
> > > >   }
> > > >   +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);
> > > > +    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 1f5eb8c856..4afa8d4d09 100644
> > > > --- a/include/hw/ppc/spapr.h
> > > > +++ b/include/hw/ppc/spapr.h
> > > > @@ -724,6 +724,9 @@ 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
> > > > @@ -812,7 +815,7 @@ 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);
> > > > @@ -903,4 +906,5 @@ 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 2d8db6d832..9a902c1064 100644
> > > > --- a/target/ppc/kvm.c
> > > > +++ b/target/ppc/kvm.c
> > > > @@ -2805,9 +2805,11 @@ 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;
> > > >   }
> 

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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