Re: [Qemu-devel] [RFC PATCH v2 02/23] spapr: Add DRC dt entries for CPUs

[David Gibson]

On Mon, Mar 23, 2015 at 07:05:43PM +0530, Bharata B Rao wrote:
> Advertise CPU DR-capability to the guest via device tree.
> 
> Signed-off-by: Bharata B Rao <address@hidden>
> Signed-off-by: Michael Roth <address@hidden>
>                [spapr_drc_reset implementation]
> Reviewed-by: David Gibson <address@hidden>
> ---
>  hw/ppc/spapr.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index a782e28..920e650 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -807,6 +807,15 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
>          spapr_populate_chosen_stdout(fdt, spapr->vio_bus);
>      }
>  
> +    if (spapr->dr_cpu_enabled) {
> +        int offset = fdt_path_offset(fdt, "/cpus");
> +        ret = spapr_drc_populate_dt(fdt, offset, NULL,
> +                                    SPAPR_DR_CONNECTOR_TYPE_CPU);
> +        if (ret < 0) {
> +            fprintf(stderr, "Couldn't set up CPU DR device tree 
> properties\n");
> +        }
> +    }
> +
>      _FDT((fdt_pack(fdt)));
>  
>      if (fdt_totalsize(fdt) > FDT_MAX_SIZE) {
> @@ -1393,6 +1402,16 @@ static SaveVMHandlers savevm_htab_handlers = {
>      .load_state = htab_load,
>  };
>  
> +static void spapr_drc_reset(void *opaque)
> +{
> +    sPAPRDRConnector *drc = opaque;
> +    DeviceState *d = DEVICE(drc);
> +
> +    if (d) {
> +        device_reset(d);
> +    }
> +}
> +
>  /* pSeries LPAR / sPAPR hardware init */
>  static void ppc_spapr_init(MachineState *machine)
>  {
> @@ -1418,6 +1437,7 @@ static void ppc_spapr_init(MachineState *machine)
>      long load_limit, fw_size;
>      bool kernel_le = false;
>      char *filename;
> +    int smt = kvmppc_smt_threads();
>  
>      msi_supported = true;
>  
> @@ -1564,6 +1584,15 @@ static void ppc_spapr_init(MachineState *machine)
>      spapr->dr_cpu_enabled = smc->dr_cpu_enabled;
>      spapr->dr_lmb_enabled = smc->dr_lmb_enabled;
>  
> +    if (spapr->dr_cpu_enabled) {
> +        for (i = 0; i < max_cpus/smp_threads; i++) {
> +            sPAPRDRConnector *drc =
> +                spapr_dr_connector_new(OBJECT(machine),
> +                                       SPAPR_DR_CONNECTOR_TYPE_CPU, i * smt);
> +            qemu_register_reset(spapr_drc_reset, drc);

This seems to be per-core, rather than per-socket as your patch
comments suggest.

-- 
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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