softmmu/memory: fix memory_region_ioeventfd_equal()
Eventfd can be registered with a zero length when fast_mmio is true.
Handle this case properly when dispatching through QEMU.
Signed-off-by: Elena Afanasova <eafanasova@gmail.com>
Message-id: cf71a62eb04e61932ff8ffdd02e0b2aab4f495a0.camel@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/softmmu/memory.c b/softmmu/memory.c
index 21d533d..8aba411 100644
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -205,8 +205,15 @@
static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd *a,
MemoryRegionIoeventfd *b)
{
- return !memory_region_ioeventfd_before(a, b)
- && !memory_region_ioeventfd_before(b, a);
+ if (int128_eq(a->addr.start, b->addr.start) &&
+ (!int128_nz(a->addr.size) || !int128_nz(b->addr.size) ||
+ (int128_eq(a->addr.size, b->addr.size) &&
+ (a->match_data == b->match_data) &&
+ ((a->match_data && (a->data == b->data)) || !a->match_data) &&
+ (a->e == b->e))))
+ return true;
+
+ return false;
}
/* Range of memory in the global map. Addresses are absolute. */
