Re: [Qemu-devel] [PATCH] ioapic: kvm: Skip route updates for masked pins

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Jun 02, 2019 at 01:42:13PM +0200, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> Masked entries will not generate interrupt messages, thus do no need to
> be routed by KVM. This is a cosmetic cleanup, just avoiding warnings of
> the kind
> 
> qemu-system-x86_64: vtd_irte_get: detected non-present IRTE (index=0, high=0xff00, low=0x100)
> 
> if the masked entry happens to reference a non-present IRTE.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/intc/ioapic.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
> index 7074489fdf..2fb288a22d 100644
> --- a/hw/intc/ioapic.c
> +++ b/hw/intc/ioapic.c
> @@ -197,9 +197,11 @@ static void ioapic_update_kvm_routes(IOAPICCommonState *s)
>              MSIMessage msg;
>              struct ioapic_entry_info info;
>              ioapic_entry_parse(s->ioredtbl[i], &info);
> -            msg.address = info.addr;
> -            msg.data = info.data;
> -            kvm_irqchip_update_msi_route(kvm_state, i, msg, NULL);
> +            if (!info.masked) {
> +                msg.address = info.addr;
> +                msg.data = info.data;
> +                kvm_irqchip_update_msi_route(kvm_state, i, msg, NULL);
> +            }
>          }
>          kvm_irqchip_commit_routes(kvm_state);
>      }
> -- 
> 2.16.4