ppc/pnv: fix StoreEOI activation

The firmware (skiboot) of the PowerNV machines can configure the XIVE
interrupt controller to activate StoreEOI on the ESB pages of the
interrupts. This feature lets software do an EOI with a store instead
of a load. It is not activated today on P9 for rare race condition
issues but it should be on future processors.

Nevertheless, QEMU has a model for StoreEOI which can be used today by
experimental firmwares. But, the use of object_property_set_int() in
the PnvXive model is incorrect and crashes QEMU. Replace it with a
direct access to the ESB flags of the XiveSource object modeling the
internal sources of the interrupt controller.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190612162357.29566-1-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/intc/pnv_xive.c b/hw/intc/pnv_xive.c
index a55c2bb..9ab77fe 100644 (file)
--- a/hw/intc/pnv_xive.c
+++ b/hw/intc/pnv_xive.c
@@ -781,8 +781,7 @@ static void pnv_xive_ic_reg_write(void *opaque, hwaddr offset,
          * support recently though)
          */
         if (val & (VC_SBC_CONF_CPLX_CIST | VC_SBC_CONF_CIST_BOTH)) {
-            object_property_set_int(OBJECT(&xive->ipi_source),
-                                    XIVE_SRC_STORE_EOI, "flags", &error_fatal);
+            xive->ipi_source.esb_flags |= XIVE_SRC_STORE_EOI;
         }
         break;