Re: [Qemu-devel] [Qemu-ppc] [PATCH v9 1/6] ppc: spapr: Handle "ibm, nmi-register" and "ibm, nmi-interlock" RTAS calls

[Aravinda Prasad <aravinda@linux.vnet.ibm.com>]

On Thursday 06 June 2019 07:04 AM, David Gibson wrote:
> On Wed, May 29, 2019 at 11:10:14AM +0530, Aravinda Prasad wrote:
>> This patch adds support in QEMU to handle "ibm,nmi-register"
>> and "ibm,nmi-interlock" RTAS calls.
>>
>> The machine check notification address is saved when the
>> OS issues "ibm,nmi-register" RTAS call.
>>
>> This patch also handles the case when multiple processors
>> experience machine check at or about the same time by
>> handling "ibm,nmi-interlock" call. In such cases, as per
>> PAPR, subsequent processors serialize waiting for the first
>> processor to issue the "ibm,nmi-interlock" call. The second
>> processor that also received a machine check error waits
>> till the first processor is done reading the error log.
>> The first processor issues "ibm,nmi-interlock" call
>> when the error log is consumed. This patch implements the
>> releasing part of the error-log while subsequent patch
>> (which builds error log) handles the locking part.
>>
>> Signed-off-by: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
>> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
>> ---
>>  hw/ppc/spapr.c         |    7 +++++
>>  hw/ppc/spapr_rtas.c    |   65 ++++++++++++++++++++++++++++++++++++++++++++++++
>>  include/hw/ppc/spapr.h |    9 ++++++-
>>  3 files changed, 80 insertions(+), 1 deletion(-)
>>
>> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
>> index e2b33e5..fae28a9 100644
>> --- a/hw/ppc/spapr.c
>> +++ b/hw/ppc/spapr.c
>> @@ -1808,6 +1808,11 @@ static void spapr_machine_reset(void)
>>      first_ppc_cpu->env.gpr[5] = 0;
>>  
>>      spapr->cas_reboot = false;
>> +
>> +    spapr->guest_machine_check_addr = -1;
>> +
>> +    /* Signal all vCPUs waiting on this condition */
>> +    qemu_cond_broadcast(&spapr->mc_delivery_cond);
>>  }
>>  
>>  static void spapr_create_nvram(SpaprMachineState *spapr)
>> @@ -3072,6 +3077,8 @@ static void spapr_machine_init(MachineState *machine)
>>  
>>          kvmppc_spapr_enable_inkernel_multitce();
>>      }
>> +
>> +    qemu_cond_init(&spapr->mc_delivery_cond);
>>  }
>>  
>>  static int spapr_kvm_type(MachineState *machine, const char *vm_type)
>> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
>> index 5bc1a93..e7509cf 100644
>> --- a/hw/ppc/spapr_rtas.c
>> +++ b/hw/ppc/spapr_rtas.c
>> @@ -352,6 +352,38 @@ static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
>>      rtas_st(rets, 1, 100);
>>  }
>>  
>> +static void rtas_ibm_nmi_register(PowerPCCPU *cpu,
>> +                                  SpaprMachineState *spapr,
>> +                                  uint32_t token, uint32_t nargs,
>> +                                  target_ulong args,
>> +                                  uint32_t nret, target_ulong rets)
>> +{
>> +    hwaddr rtas_addr = spapr_get_rtas_addr();
>> +
>> +    if (!rtas_addr) {
>> +        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
>> +        return;
>> +    }
>> +
>> +    spapr->guest_machine_check_addr = rtas_ld(args, 1);
>> +    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
>> +}
>> +
>> +static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu,
>> +                                   SpaprMachineState *spapr,
>> +                                   uint32_t token, uint32_t nargs,
>> +                                   target_ulong args,
>> +                                   uint32_t nret, target_ulong rets)
>> +{
>> +    if (spapr->guest_machine_check_addr == -1) {
>> +        /* NMI register not called */
>> +        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
>> +    } else {
>> +        qemu_cond_signal(&spapr->mc_delivery_cond);
>> +        rtas_st(rets, 0, RTAS_OUT_SUCCESS);
>> +    }
>> +}
>> +
>>  static struct rtas_call {
>>      const char *name;
>>      spapr_rtas_fn fn;
>> @@ -470,6 +502,35 @@ 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 struct fdt_property *rtas_addr_prop;
>> +    void *fdt = spapr->fdt_blob;
>> +    uint32_t rtas_addr;
>> +
>> +    /* fetch rtas addr from fdt */
>> +    rtas_node = fdt_path_offset(fdt, "/rtas");
>> +    if (rtas_node == 0) {
>> +        return 0;
> 
> This is incorrect, a return code < 0 indicates an error which you
> should check for.  A return code of 0 indicates the root node, which
> could only happen if libfdt was badly buggy.

ok

> 
>> +    }
>> +
>> +    rtas_addr_prop = fdt_get_property(fdt, rtas_node, "linux,rtas-base", NULL);
> 
> fdt_get_property is generally only needed for certain edge cases.
> fdt_getprop() is a better option.

ok

> 
>> +    if (!rtas_addr_prop) {
>> +        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.
>> +     */
>> +    rtas_addr = fdt32_to_cpu(*(uint32_t *)rtas_addr_prop->data);
>> +    return (hwaddr)rtas_addr;
>> +}
>> +
>> +
>>  static void core_rtas_register_types(void)
>>  {
>>      spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
>> @@ -493,6 +554,10 @@ static void core_rtas_register_types(void)
>>                          rtas_set_power_level);
>>      spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
>>                          rtas_get_power_level);
>> +    spapr_rtas_register(RTAS_IBM_NMI_REGISTER, "ibm,nmi-register",
>> +                        rtas_ibm_nmi_register);
>> +    spapr_rtas_register(RTAS_IBM_NMI_INTERLOCK, "ibm,nmi-interlock",
>> +                        rtas_ibm_nmi_interlock);
>>  }
>>  
>>  type_init(core_rtas_register_types)
>> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
>> index 4f5becf..9dc5e30 100644
>> --- a/include/hw/ppc/spapr.h
>> +++ b/include/hw/ppc/spapr.h
>> @@ -188,6 +188,10 @@ struct SpaprMachineState {
>>       * occurs during the unplug process. */
>>      QTAILQ_HEAD(, SpaprDimmState) pending_dimm_unplugs;
>>  
>> +    /* State related to "ibm,nmi-register" and "ibm,nmi-interlock" calls */
>> +    target_ulong guest_machine_check_addr;
>> +    QemuCond mc_delivery_cond;
>> +
>>      /*< public >*/
>>      char *kvm_type;
>>      char *host_model;
>> @@ -624,8 +628,10 @@ target_ulong spapr_hypercall(PowerPCCPU *cpu, target_ulong opcode,
>>  #define RTAS_IBM_CREATE_PE_DMA_WINDOW           (RTAS_TOKEN_BASE + 0x27)
>>  #define RTAS_IBM_REMOVE_PE_DMA_WINDOW           (RTAS_TOKEN_BASE + 0x28)
>>  #define RTAS_IBM_RESET_PE_DMA_WINDOW            (RTAS_TOKEN_BASE + 0x29)
>> +#define RTAS_IBM_NMI_REGISTER                   (RTAS_TOKEN_BASE + 0x2A)
>> +#define RTAS_IBM_NMI_INTERLOCK                  (RTAS_TOKEN_BASE + 0x2B)
>>  
>> -#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x2A)
>> +#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x2C)
>>  
>>  /* RTAS ibm,get-system-parameter token values */
>>  #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS      20
>> @@ -876,4 +882,5 @@ 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);
>> +uint64_t spapr_get_rtas_addr(void);
>>  #endif /* HW_SPAPR_H */
>>
> 

-- 
Regards,
Aravinda