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ppc/xive2: Redistribute group interrupt preempted by higher priority interrupt

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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>
This commit is contained in:
Nicholas Piggin 2025-05-12 13:10:38 +10:00 • committed by Cédric Le Goater
parent 1319cb8997
commit cc15d50b6e
1 changed files with 12 additions and 2 deletions
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14
hw/intc/xive2.c
View file

@ -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;
}