From: Oleksandr Andrushchenko <[email protected]>
At the moment, we always allocate an extra 16 slots for IO handlers
(see MAX_IO_HANDLER). So while adding an IO trap handler for the emulated
PCI host bridge we are not breaking anything, but we have a latent bug
as the maximum number of IOs may be exceeded.
Fix this by explicitly telling that we have an additional IO handler, so it is
accounted.
Fixes: d59168dc05a5 ("xen/arm: Enable the existing x86 virtual PCI support for
ARM")
Signed-off-by: Oleksandr Andrushchenko <[email protected]>
Acked-by: Julien Grall <[email protected]>
---
Since v7:
- updated comment
New in v7
---
xen/arch/arm/vpci.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/vpci.c b/xen/arch/arm/vpci.c
index 1564448c6c8d..84aaaaebd69d 100644
--- a/xen/arch/arm/vpci.c
+++ b/xen/arch/arm/vpci.c
@@ -124,7 +124,11 @@ unsigned int domain_vpci_get_num_mmio_handlers(struct
domain *d)
return ret < 0 ? 0 : ret;
}
- return 0;
+ /*
+ * For guests each host bridge requires one region to cover the
+ * configuration space. At the moment, we only expose a single host bridge.
+ */
+ return 1;
}
/*
--
2.25.1
