Re: [PATCH 11/50] ppc/xive2: Do not present group interrupt on OS-push if precluded by CPPR

[Miles Glenn]

Reviewed-by: Glenn Miles <mil...@linux.ibm.com>

On Mon, 2025-05-12 at 13:10 +1000, Nicholas Piggin wrote:
> 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 <npig...@gmail.com>
> ---
>  hw/intc/xive2.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c
> index 1971c05fa1..8ede95b671 100644
> --- a/hw/intc/xive2.c
> +++ b/hw/intc/xive2.c
> @@ -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);