Re: [Qemu-devel] [Qemu-ppc] [PATCH v8 1/6] ppc: spapr: Handle "ibm, nmi-register" and "ibm, nmi-interlock" RTAS calls

[Greg Kurz <groug@kaod.org>]

On Mon, 22 Apr 2019 12:32:58 +0530
Aravinda Prasad <aravinda@linux.vnet.ibm.com> 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>
> ---
>  hw/ppc/spapr.c         |   18 ++++++++++++++
>  hw/ppc/spapr_rtas.c    |   61 ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/hw/ppc/spapr.h |    9 ++++++-
>  3 files changed, 87 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index c56939a..6642cb5 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1805,6 +1805,11 @@ 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)
> @@ -2095,6 +2100,16 @@ static const VMStateDescription vmstate_spapr_dtb = {
>      },
>  };
>  
> +static const VMStateDescription vmstate_spapr_machine_check = {
> +    .name = "spapr_machine_check",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_UINT64(guest_machine_check_addr, SpaprMachineState),
> +        VMSTATE_END_OF_LIST()
> +    },

This VMState descriptor is missing a .needed field because we only want
to migrate the subsection if the guest has called NMI register, ie.
spapr->guest_machine_check_addr != (target_ulong) -1.

> +};
> +
>  static const VMStateDescription vmstate_spapr = {
>      .name = "spapr",
>      .version_id = 3,
> @@ -2127,6 +2142,7 @@ static const VMStateDescription vmstate_spapr = {
>          &vmstate_spapr_dtb,
>          &vmstate_spapr_cap_large_decr,
>          &vmstate_spapr_cap_ccf_assist,
> +        &vmstate_spapr_machine_check,
>          NULL
>      }
>  };
> @@ -3068,6 +3084,8 @@ 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 ee24212..c2f3991 100644
> --- a/hw/ppc/spapr_rtas.c
> +++ b/hw/ppc/spapr_rtas.c
> @@ -348,6 +348,39 @@ 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)
> +{
> +    uint64_t 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) {

Hmm... the default value is -1. It looks like the check should rather be:

    if (spapr->guest_machine_check_addr == (target_ulong) -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;
> @@ -466,6 +499,30 @@ void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr)
>      }
>  }
>  
> +uint64_t spapr_get_rtas_addr(void)

Shouldn't this be hwaddr instead of uint64_t ?

> +{
> +    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;
> +    }
> +
> +    rtas_addr_prop = fdt_get_property(fdt, rtas_node, "linux,rtas-base", NULL);
> +    if (!rtas_addr_prop) {

Just for curiosity: this is ok for linux, but what about other OSes (eg. AIX) ?

> +        return 0;
> +    }
> +
> +    rtas_addr = fdt32_to_cpu(*(uint32_t *)rtas_addr_prop->data);

Also this assumes the OS called RTAS instantiate-rtas, but some other
OS might have called RTAS instantiate-rtas-64 instead. I guess it is
ok for now because SLOF only provides the 32-bit variant, but a
comment would certainly help IMHO.

> +    return (uint64_t)rtas_addr;
> +}
> +
> +
>  static void core_rtas_register_types(void)
>  {
>      spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
> @@ -489,6 +546,10 @@ 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 7e32f30..ec6f33e 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -187,6 +187,10 @@ 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;
> @@ -623,8 +627,10 @@ 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
> @@ -874,4 +880,5 @@ 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 */
> 
>