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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>
This commit is contained in:
Elena Afanasova 2020-10-19 13:20:13 -07:00 committed by Stefan Hajnoczi
parent f9b4908895
commit e6ffd75782
1 changed files with 9 additions and 2 deletions
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11
softmmu/memory.c
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@ -205,8 +205,15 @@ static bool memory_region_ioeventfd_before(MemoryRegionIoeventfd *a,
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. */