Re: [PATCH v2] spapr/xive: Use the xics flag to check for XIVE-only IRQ backends

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, Aug 20, 2020 at 04:01:06PM +0200, Cédric Le Goater wrote:
> The sPAPR machine has four different IRQ backends, each implementing
> the XICS or XIVE interrupt mode or both in the case of the 'dual'
> backend.
> 
> If a machine is started in P8 compat mode, QEMU should necessarily
> support the XICS interrupt mode and in that case, the XIVE-only IRQ
> backend is invalid. Currently, spapr_irq_check() tests the pointer
> value to the IRQ backend to check for this condition, instead use the
> 'xics' flag. It's equivalent and it will ease the introduction of new
> XIVE-only IRQ backends if needed.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Thanks, applied to ppc-for-5.2.

I still kind of want to remove the last vestiges of those
"backends", but I'm unlikely to have time to do so soon.

> ---
>  hw/ppc/spapr_irq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
> index 80cf1c3d6bb2..d036c8fef519 100644
> --- a/hw/ppc/spapr_irq.c
> +++ b/hw/ppc/spapr_irq.c
> @@ -172,7 +172,7 @@ static int spapr_irq_check(SpaprMachineState *spapr, Error **errp)
>           * To cover both and not confuse the OS, add an early failure in
>           * QEMU.
>           */
> -        if (spapr->irq == &spapr_irq_xive) {
> +        if (!spapr->irq->xics) {
>              error_setg(errp, "XIVE-only machines require a POWER9 CPU");
>              return -1;
>          }

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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