Re: [Qemu-devel] [Qemu-ppc] [PATCH 1/3] spapr/xive: EQ page should be naturally aligned

[Greg Kurz <groug@kaod.org>]

On Wed,  8 May 2019 19:19:44 +0200
Cédric Le Goater <clg@kaod.org> wrote:

> When the OS configures the EQ page in which to receive event
> notifications from the XIVE interrupt controller, the page should be
> naturally aligned. Add this check.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  hw/intc/spapr_xive.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
> index 097f88d4608d..666e24e9b447 100644
> --- a/hw/intc/spapr_xive.c
> +++ b/hw/intc/spapr_xive.c
> @@ -993,6 +993,12 @@ static target_ulong h_int_set_queue_config(PowerPCCPU *cpu,
>      case 16:
>      case 21:
>      case 24:
> +        if (!QEMU_IS_ALIGNED(qpage, 1ul << qsize)) {
> +            qemu_log_mask(LOG_GUEST_ERROR, "XIVE: EQ @0x%" HWADDR_PRIx
> +                          " is not naturally aligned with %" HWADDR_PRIx "\n",
> +                          qpage, 1ul << qsize);
> +            return H_P4;
> +        }
>          end.w2 = cpu_to_be32((qpage >> 32) & 0x0fffffff);
>          end.w3 = cpu_to_be32(qpage & 0xffffffff);
>          end.w0 |= cpu_to_be32(END_W0_ENQUEUE);