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| author | Nicholas Piggin <npiggin@gmail.com> | 2025-05-12 13:10:38 +1000 |
|---|---|---|
| committer | Cédric Le Goater <clg@redhat.com> | 2025-07-21 08:03:52 +0200 |
| commit | cc15d50b6e8a4090d667755259ea36144b79d22f (patch) | |
| tree | 7df4e1ee207b1a54e2e6482de2f48b62bd6e5a2a | |
| parent | 1319cb8997b9d0fdaae04a79398a2ed06d4cb5e1 (diff) | |
| download | qemu-cc15d50b6e8a4090d667755259ea36144b79d22f.zip qemu-cc15d50b6e8a4090d667755259ea36144b79d22f.tar.gz qemu-cc15d50b6e8a4090d667755259ea36144b79d22f.tar.bz2 | |
ppc/xive2: Redistribute group interrupt preempted by higher priority interrupt
A group interrupt that gets preempted by a higher priority interrupt
delivery must be redistributed otherwise it would get lost.
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/20250512031100.439842-30-npiggin@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
| -rw-r--r-- | hw/intc/xive2.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c index 602b23d..f51fd38 100644 --- a/hw/intc/xive2.c +++ b/hw/intc/xive2.c @@ -1638,11 +1638,21 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk, crowd, cam_ignore, priority, xive_get_field32(END2_W7_F1_LOG_SERVER_ID, end.w7), &match)) { + XiveTCTX *tctx = match.tctx; + uint8_t ring = match.ring; + uint8_t alt_ring = (ring == TM_QW2_HV_POOL) ? TM_QW3_HV_PHYS : ring; + uint8_t *aregs = &tctx->regs[alt_ring]; + uint8_t nsr = aregs[TM_NSR]; uint8_t group_level; + if (priority < aregs[TM_PIPR] && + xive_nsr_indicates_group_exception(alt_ring, nsr)) { + xive2_redistribute(xrtr, tctx, alt_ring); + } + group_level = xive_get_group_level(crowd, cam_ignore, nvx_blk, nvx_idx); - trace_xive_presenter_notify(nvx_blk, nvx_idx, match.ring, group_level); - xive_tctx_pipr_update(match.tctx, match.ring, priority, group_level); + trace_xive_presenter_notify(nvx_blk, nvx_idx, ring, group_level); + xive_tctx_pipr_update(tctx, ring, priority, group_level); return; } |