Re: [PATCH v2 08/13] xive: Use the XIVE fabric link under the XIVE router

[David Gibson]

On Thu, Dec 19, 2019 at 07:11:50PM +0100, Cédric Le Goater wrote:
> From: Greg Kurz <address@hidden>
> 
> Now that the spapr and pnv machines do set the "xive-fabric" link, the
> use of the XIVE fabric pointer becomes mandatory. This is checked with
> an assert() in a new realize hook. Since the XIVE router is realized at
> machine init for the all the machine's life time, no risk to abort an
> already running guest (ie. not a hotplug path).
> 
> This gets rid of a qdev_get_machine() call.
> 
> Signed-off-by: Greg Kurz <address@hidden>
> Signed-off-by: Cédric Le Goater <address@hidden>

LGTM, but will need rebase.

> ---
>  hw/intc/xive.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/intc/xive.c b/hw/intc/xive.c
> index 6df89b06da38..12a362b681a6 100644
> --- a/hw/intc/xive.c
> +++ b/hw/intc/xive.c
> @@ -1378,6 +1378,13 @@ static int xive_router_get_block_id(XiveRouter *xrtr)
>     return xrc->get_block_id(xrtr);
>  }
>  
> +static void xive_router_realize(DeviceState *dev, Error **errp)
> +{
> +    XiveRouter *xrtr = XIVE_ROUTER(dev);
> +
> +    assert(xrtr->xfb);
> +}
> +
>  /*
>   * Encode the HW CAM line in the block group mode format :
>   *
> @@ -1470,12 +1477,11 @@ int xive_presenter_tctx_match(XivePresenter *xptr, 
> XiveTCTX *tctx,
>   *
>   * The parameters represent what is sent on the PowerBus
>   */
> -static bool xive_presenter_notify(uint8_t format,
> +static bool xive_presenter_notify(XiveFabric *xfb, uint8_t format,
>                                    uint8_t nvt_blk, uint32_t nvt_idx,
>                                    bool cam_ignore, uint8_t priority,
>                                    uint32_t logic_serv)
>  {
> -    XiveFabric *xfb = XIVE_FABRIC(qdev_get_machine());
>      XiveFabricClass *xfc = XIVE_FABRIC_GET_CLASS(xfb);
>      XiveTCTXMatch match = { .tctx = NULL, .ring = 0 };
>      int count;
> @@ -1607,7 +1613,7 @@ static void xive_router_end_notify(XiveRouter *xrtr, 
> uint8_t end_blk,
>          return;
>      }
>  
> -    found = xive_presenter_notify(format, nvt_blk, nvt_idx,
> +    found = xive_presenter_notify(xrtr->xfb, format, nvt_blk, nvt_idx,
>                            xive_get_field32(END_W7_F0_IGNORE, end.w7),
>                            priority,
>                            xive_get_field32(END_W7_F1_LOG_SERVER_ID, end.w7));
> @@ -1727,6 +1733,8 @@ static void xive_router_class_init(ObjectClass *klass, 
> void *data)
>  
>      dc->desc    = "XIVE Router Engine";
>      dc->props   = xive_router_properties;
> +    /* Parent is SysBusDeviceClass. No need to call its realize hook */
> +    dc->realize = xive_router_realize;
>      xnc->notify = xive_router_notify;
>  }
>  

-- 
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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