ppc/xive2: Add undelivered group interrupt to backlog

When a group interrupt cannot be delivered, we need to:
- increment the backlog counter for the group in the NVG table
  (if the END is configured to keep a backlog).
- start a broadcast operation to set the LSMFB field on matching CPUs
  which can't take the interrupt now because they're running at too
  high a priority.

[npiggin: squash in fixes from milesg]
[milesg: only load the NVP if the END is !ignore]
[milesg: always broadcast backlog, not only when there are precluded VPs]

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Kowal <kowal@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 6fec455ff9..af836c1388 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1,7 +1,9 @@
 /*
  * QEMU PowerPC PowerNV machine model
  *
- * Copyright (c) 2016, IBM Corporation.
+ * Copyright (c) 2016-2024, IBM Corporation.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -2662,6 +2664,23 @@ static int pnv10_xive_match_nvt(XiveFabric *xfb, uint8_t format,
     return total_count;
 }
 
+static int pnv10_xive_broadcast(XiveFabric *xfb,
+                                uint8_t nvt_blk, uint32_t nvt_idx,
+                                uint8_t priority)
+{
+    PnvMachineState *pnv = PNV_MACHINE(xfb);
+    int i;
+
+    for (i = 0; i < pnv->num_chips; i++) {
+        Pnv10Chip *chip10 = PNV10_CHIP(pnv->chips[i]);
+        XivePresenter *xptr = XIVE_PRESENTER(&chip10->xive);
+        XivePresenterClass *xpc = XIVE_PRESENTER_GET_CLASS(xptr);
+
+        xpc->broadcast(xptr, nvt_blk, nvt_idx, priority);
+    }
+    return 0;
+}
+
 static bool pnv_machine_get_big_core(Object *obj, Error **errp)
 {
     PnvMachineState *pnv = PNV_MACHINE(obj);
@@ -2795,6 +2814,7 @@ static void pnv_machine_p10_common_class_init(ObjectClass *oc, void *data)
     pmc->dt_power_mgt = pnv_dt_power_mgt;
 
     xfc->match_nvt = pnv10_xive_match_nvt;
+    xfc->broadcast = pnv10_xive_broadcast;
 
     machine_class_allow_dynamic_sysbus_dev(mc, TYPE_PNV_PHB);
 }