Re: [RFC PATCH 02/13] ppc/spapr: Add FWNMI System Reset state

[David Gibson]

On Wed, Mar 04, 2020 at 03:28:39PM +1000, Nicholas Piggin wrote:
> The FWNMI option must deliver system reset interrupts to their
> registered address, and there are a few constraints on the handler
> addresses specified in PAPR. Add the system reset address state and
> checks.
> 
> Signed-off-by: Nicholas Piggin <address@hidden>
> ---
>  hw/ppc/spapr.c         |  2 ++
>  hw/ppc/spapr_rtas.c    | 14 +++++++++++++-
>  include/hw/ppc/spapr.h |  3 ++-
>  3 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 27b0c2c425..a8c6dbc5bd 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1696,6 +1696,7 @@ static void spapr_machine_reset(MachineState *machine)
>  
>      spapr->cas_reboot = false;
>  
> +    spapr->fwnmi_system_reset_addr = -1;
>      spapr->fwnmi_machine_check_addr = -1;
>      spapr->fwnmi_machine_check_interlock = -1;
>  
> @@ -2015,6 +2016,7 @@ static const VMStateDescription vmstate_spapr_fwnmi = {
>      .needed = spapr_fwnmi_needed,
>      .pre_save = spapr_fwnmi_pre_save,
>      .fields = (VMStateField[]) {
> +        VMSTATE_UINT64(fwnmi_system_reset_addr, SpaprMachineState),
>          VMSTATE_UINT64(fwnmi_machine_check_addr, SpaprMachineState),
>          VMSTATE_INT32(fwnmi_machine_check_interlock, SpaprMachineState),
>          VMSTATE_END_OF_LIST()
> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
> index 571615445a..2315505181 100644
> --- a/hw/ppc/spapr_rtas.c
> +++ b/hw/ppc/spapr_rtas.c
> @@ -414,6 +414,7 @@ static void rtas_ibm_nmi_register(PowerPCCPU *cpu,
>                                    uint32_t nret, target_ulong rets)
>  {
>      hwaddr rtas_addr;
> +    target_ulong sreset_addr, mce_addr;
>  
>      if (spapr_get_cap(spapr, SPAPR_CAP_FWNMI) == SPAPR_CAP_OFF) {
>          rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
> @@ -426,7 +427,18 @@ static void rtas_ibm_nmi_register(PowerPCCPU *cpu,
>          return;
>      }
>  
> -    spapr->fwnmi_machine_check_addr = rtas_ld(args, 1);
> +    sreset_addr = rtas_ld(args, 0);
> +    mce_addr = rtas_ld(args, 1);
> +
> +    /* PAPR requires these are in the first 32MB of memory and within RMA */
> +    if (sreset_addr >= 32*1024*1024 || sreset_addr >= spapr->rma_size ||

Use 32 * MiB please.

> +           mce_addr >= 32*1024*1024 ||    mce_addr >= spapr->rma_size) {

In practice the RMA limit can never be hit - we always have at least
128 MiB of RMA, or SLOF won't start.  It's nice to be explicit about
the limitation regardless, though.

> +        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
> +        return;
> +    }
> +
> +    spapr->fwnmi_system_reset_addr = sreset_addr;
> +    spapr->fwnmi_machine_check_addr = mce_addr;
>  
>      rtas_st(rets, 0, RTAS_OUT_SUCCESS);
>  }
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 0879b68676..dcc7779ec7 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -194,9 +194,10 @@ struct SpaprMachineState {
>  
>      /* State related to FWNMI option */
>  
> -    /* Machine Check Notification Routine address
> +    /* System Reset and Machine Check Notification Routine addresses
>       * registered by "ibm,nmi-register" RTAS call.
>       */
> +    target_ulong fwnmi_system_reset_addr;
>      target_ulong fwnmi_machine_check_addr;
>  
>      /* Machine Check FWNMI synchronization, fwnmi_machine_check_interlock is

-- 
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

signature.asc
Description: PGP signature