Re: [Qemu-devel] [Qemu-ppc] [PATCH 1/5] spapr: Leave DR-indicator management to the guest

[Laurent Vivier <lvivier@redhat.com>]

On 20/06/2017 03:53, David Gibson wrote:
> The DR-indicator is essentially a "virtual LED" attached to a hotpluggable
> device, which the guest can set to various states for the attention of
> the operator or management layers.
> 
> It's mostly guest managed, except that we once-off set it to
> ACTIVE/INACTIVE in the attach/detach path.  While that makes certain sense,
> there's no indication in PAPR that the hypervisor should do this, and the
> drmgr code on the guest side doesn't appear to need it (it will already set
> the indicator to ACTIVE on hotplug, and INACTIVE on remove).
> 
> So, leave the DR-indicator entirely to the guest; the only thing we need
> to do is ensure it's in a sane state on reset.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> ---
>  hw/ppc/spapr_drc.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
> index fd9e07d..0bc9046 100644
> --- a/hw/ppc/spapr_drc.c
> +++ b/hw/ppc/spapr_drc.c
> @@ -353,8 +353,6 @@ void spapr_drc_attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
>      }
>      g_assert(fdt || coldplug);
>  
> -    drc->dr_indicator = SPAPR_DR_INDICATOR_ACTIVE;
> -
>      drc->dev = d;
>      drc->fdt = fdt;
>      drc->fdt_start_offset = fdt_start_offset;
> @@ -372,8 +370,6 @@ void spapr_drc_attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
>  
>  static void spapr_drc_release(sPAPRDRConnector *drc)
>  {
> -    drc->dr_indicator = SPAPR_DR_INDICATOR_INACTIVE;
> -
>      /* Calling release callbacks based on spapr_drc_type(drc). */
>      switch (spapr_drc_type(drc)) {
>      case SPAPR_DR_CONNECTOR_TYPE_CPU:
> @@ -452,12 +448,14 @@ static void reset(DeviceState *d)
>          if (spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PCI) {
>              drc->allocation_state = SPAPR_DR_ALLOCATION_STATE_USABLE;
>          }
> +        drc->dr_indicator = SPAPR_DR_INDICATOR_ACTIVE;
>      } else {
>          /* Otherwise device is absent, but might be hotplugged */
>          drc->isolation_state = SPAPR_DR_ISOLATION_STATE_ISOLATED;
>          if (spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PCI) {
>              drc->allocation_state = SPAPR_DR_ALLOCATION_STATE_UNUSABLE;
>          }
> +        drc->dr_indicator = SPAPR_DR_INDICATOR_INACTIVE;
>      }
>  }
>  
> 

Reviewed-by: Laurent Vivier <lvivier@redhat.com>