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author | Paul Durrant <paul.durrant@citrix.com> | 2016-05-09 17:31:20 +0100 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-05-29 09:11:11 +0200 |
commit | a8ff4316795c7051b38727ec4a81c65dfcf63dc6 (patch) | |
tree | 356b2d842348e521e9d506dcac3872c02786d80c /xen-hvm.c | |
parent | a4a0e4b258b2034559a546927794f477025d55d6 (diff) | |
download | qemu-a8ff4316795c7051b38727ec4a81c65dfcf63dc6.zip qemu-a8ff4316795c7051b38727ec4a81c65dfcf63dc6.tar.gz qemu-a8ff4316795c7051b38727ec4a81c65dfcf63dc6.tar.bz2 |
xen-hvm: ignore background I/O sections
Since Xen will correctly handle accesses to unimplemented I/O ports (by
returning all 1's for reads and ignoring writes) there is no need for
QEMU to register backgroud I/O sections.
This patch therefore adds checks to xen_io_add/del so that sections with
memory-region ops pointing at 'unassigned_io_ops' are ignored.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1462811480-16295-1-git-send-email-paul.durrant@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'xen-hvm.c')
-rw-r--r-- | xen-hvm.c | 14 |
1 files changed, 12 insertions, 2 deletions
@@ -511,8 +511,13 @@ static void xen_io_add(MemoryListener *listener, MemoryRegionSection *section) { XenIOState *state = container_of(listener, XenIOState, io_listener); + MemoryRegion *mr = section->mr; - memory_region_ref(section->mr); + if (mr->ops == &unassigned_io_ops) { + return; + } + + memory_region_ref(mr); xen_map_io_section(xen_xc, xen_domid, state->ioservid, section); } @@ -521,10 +526,15 @@ static void xen_io_del(MemoryListener *listener, MemoryRegionSection *section) { XenIOState *state = container_of(listener, XenIOState, io_listener); + MemoryRegion *mr = section->mr; + + if (mr->ops == &unassigned_io_ops) { + return; + } xen_unmap_io_section(xen_xc, xen_domid, state->ioservid, section); - memory_region_unref(section->mr); + memory_region_unref(mr); } static void xen_device_realize(DeviceListener *listener, |