kvm: Don't abort on kvm_irqchip_add_msi_route()

Anyone using these functions has to be prepared that irqchip
support may not be present.  It shouldn't be up to the core
code to determine whether this is a fatal error.  Currently
code written as:

virq = kvm_irqchip_add_msi_route(...)
if (virq < 0) {
    <slow path>
} else {
    <fast path>
}

works on x86 with and without kvm irqchip enabled, works
without kvm support compiled in, but aborts() on !x86 with
kvm support.

Signed-off-by: Alex Williamson <[email protected]>
Acked-by: Jan Kiszka <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>

diff --git a/kvm-all.c b/kvm-all.c
index f8e432841fa7abfb45a5912009ada330df952e3d..a0c33b38deca98829bf382edb2aca84eebfecc23 100644 (file)
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1142,7 +1142,7 @@ int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
 
 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
 {
-    abort();
+    return -ENOSYS;
 }
 
 static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)