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authorPeter Xu <peterx@redhat.com>2016-07-31 22:18:05 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2016-08-03 18:44:57 +0200
commitf99b86b94987561580a94838766458e1c7b8685d (patch)
tree2ec96d3d57f4d841e2956b5b9bf8cb75c7092fad /hw
parent7298d4fd515c190b1b6c1266735f6212300313ae (diff)
x86: ioapic: ignore level irq during processing
For level triggered interrupts, we will get Remote IRR bit cleared after guest kernel finished processing specific request. Before that, we should ignore the same interrupt from triggering again. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <1469974685-4144-1-git-send-email-peterx@redhat.com> [Push new "if" up so that it covers KVM split irqchip as well. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw')
-rw-r--r--hw/intc/ioapic.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
index 2d3282a864..a00d88210a 100644
--- a/hw/intc/ioapic.c
+++ b/hw/intc/ioapic.c
@@ -117,21 +117,25 @@ static void ioapic_service(IOAPICCommonState *s)
s->ioredtbl[i] |= IOAPIC_LVT_REMOTE_IRR;
}
+ if (coalesce) {
+ /* We are level triggered interrupts, and the
+ * guest should be still working on previous one,
+ * so skip it. */
+ continue;
+ }
+
#ifdef CONFIG_KVM
if (kvm_irqchip_is_split()) {
if (info.trig_mode == IOAPIC_TRIGGER_EDGE) {
kvm_set_irq(kvm_state, i, 1);
kvm_set_irq(kvm_state, i, 0);
} else {
- if (!coalesce) {
- kvm_set_irq(kvm_state, i, 1);
- }
+ kvm_set_irq(kvm_state, i, 1);
}
continue;
}
-#else
- (void)coalesce;
#endif
+
/* No matter whether IR is enabled, we translate
* the IOAPIC message into a MSI one, and its
* address space will decide whether we need a