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

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

On Sun, Jul 21, 2019 at 10:58:42AM +0200, Jan Kiszka wrote:
> On 03.06.19 02:36, Michael S. Tsirkin wrote:
> > 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
> >
> >
> 
> Ping. Or is this queued for 4.2?
> 
> Jan

Paolo was queueing ioapic things recently. I can take this if
he doesn't respond until I pack up my next pull req.

-- 
MST