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ioapic: coalesce level interrupts

Message ID 1438244408-9461-1-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini July 30, 2015, 8:20 a.m. UTC 
If a level-triggered interrupt goes down and back up before the
corresponding EOI, it should be coalesced.  This fixes one testcase
in kvm-unit-tests' ioapic.flat.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/intc/ioapic.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
index b527932..6ad3c66 100644
--- a/hw/intc/ioapic.c
+++ b/hw/intc/ioapic.c
@@ -98,7 +98,9 @@  static void ioapic_set_irq(void *opaque, int vector, int level)
             /* level triggered */
             if (level) {
                 s->irr |= mask;
-                ioapic_service(s);
+                if (!(entry & IOAPIC_LVT_REMOTE_IRR)) {
+                    ioapic_service(s);
+                }
             } else {
                 s->irr &= ~mask;
             }