Some guests do a large number of mask/unmask
calls which currently trigger expensive route update
system calls.
Detect that route in unchanged and skip the system call.
Reported-by: "Zhanghaoyu (A)" <haoyu.zhang@xxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
kvm-all.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kvm-all.c b/kvm-all.c
index f119ce1..891722b 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1026,6 +1026,10 @@ static int kvm_update_routing_entry(KVMState *s,
continue;
}
+ if(!memcmp(entry, new_entry, sizeof *entry)) {
+ return 0;
+ }
+
*entry = *new_entry;
kvm_irqchip_commit_routes(s);
--
MST
--
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