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ppc/xive2: Do not present group interrupt on OS-push if precluded by CPPR

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Group interrupts should not be taken from the backlog and presented
if they are precluded by CPPR.

Fixes: 855434b3b8 ("ppc/xive2: Process group backlog when pushing an OS context")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Glenn Miles <milesg@linux.ibm.com>
Reviewed-by: Michael Kowal <kowal@linux.ibm.com>
Reviewed-by: Caleb Schlossin <calebs@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250512031100.439842-12-npiggin@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Nicholas Piggin
2025-07-21 08:03:52 +02:00
committed by Cédric Le Goater
parent d4720a7faf
commit 3abbec04e6
1 changed files with 3 additions and 1 deletions
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hw/intc/xive2.c
+3 -1
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@@ -845,7 +845,9 @@ static void xive2_tctx_need_resend(Xive2Router *xrtr, XiveTCTX *tctx,
group_prio = xive2_presenter_backlog_scan(xptr, nvp_blk, nvp_idx,
first_group, &group_level);
regs[TM_LSMFB] = group_prio;
if (regs[TM_LGS] && group_prio < backlog_prio) {
if (regs[TM_LGS] && group_prio < backlog_prio &&
group_prio < regs[TM_CPPR]) {
/* VP can take a group interrupt */
xive2_presenter_backlog_decr(xptr, nvp_blk, nvp_idx,
group_prio, group_level);