KVM: s390: fast path for shadow gmaps in gmap notifier

The default kvm gmap notifier doesn't have to handle shadow gmaps.
So let's just directly exit in case we get notified about one.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 9dd52980605cb021ab1552bc6d8b2e5e2ef8d1f3..45a8316ba1ebe6124962b756dac2d8510215398e 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1986,6 +1986,8 @@ static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
        unsigned long prefix;
        int i;
 
+       if (gmap_is_shadow(gmap))
+               return;
        if (start >= 1UL << 31)
                /* We are only interested in prefix pages */
                return;