ppc/xive2: Prevent pulling of pool context losing phys interrupt

When the pool context is pulled, the shared pool/phys signal is
reset, which loses the qemu irq if a phys interrupt was presented.

Only reset the signal if a poll irq was presented.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Reviewed-by: Michael Kowal <kowal@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250512031100.439842-42-npiggin@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c
index 7631d48862..112397459a 100644
--- a/hw/intc/xive2.c
+++ b/hw/intc/xive2.c
@@ -727,20 +727,22 @@ static uint64_t xive2_tm_pull_ctx(XivePresenter *xptr, XiveTCTX *tctx,
                 xive2_redistribute(xrtr, tctx, cur_ring);
             }
         }
+
+        /*
+         * Lower external interrupt line of requested ring and below except for
+         * USER, which doesn't exist.
+         */
+        if (xive_nsr_indicates_exception(cur_ring, nsr)) {
+            if (cur_ring == xive_nsr_exception_ring(cur_ring, nsr)) {
+                xive_tctx_reset_signal(tctx, cur_ring);
+            }
+        }
     }
 
     if (xive2_router_get_config(xrtr) & XIVE2_VP_SAVE_RESTORE && do_save) {
         xive2_tctx_save_ctx(xrtr, tctx, ring, nvp_blk, nvp_idx);
     }
 
-    /*
-     * Lower external interrupt line of requested ring and below except for
-     * USER, which doesn't exist.
-     */
-    for (cur_ring = TM_QW1_OS; cur_ring <= ring;
-         cur_ring += XIVE_TM_RING_SIZE) {
-        xive_tctx_reset_signal(tctx, cur_ring);
-    }
     return target_ringw2;
 }