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[PATCH] xen/arm: Fix under-mapping in map_range_to_domain()
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Wed, 7 Oct 2026 15:58:48 +0200
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- Cc: Michal Orzel <michal.orzel@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 07 Oct 2026 13:59:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
If the memory region to be mapped does not start at the page boundary
and its end spans over the page boundary, map_range_to_domain() passes
a number of pages that is short by one to map_regions_p2mt(). Domain's
attempt to access memory within that page will fail. Fix it by calculating
the number of pages to be mapped taking into account the start offset.
Fixes: 88c10b0d6eee ("arch/arm: let map_mmio_regions() use start and count")
Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
xen/arch/arm/device.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/xen/arch/arm/device.c b/xen/arch/arm/device.c
index b11366d722ef..ad50838b9f11 100644
--- a/xen/arch/arm/device.c
+++ b/xen/arch/arm/device.c
@@ -89,7 +89,7 @@ int __overlay_init map_range_to_domain(const struct
dt_device_node *dev,
{
res = map_regions_p2mt(d,
gaddr_to_gfn(addr),
- PFN_UP(len),
+ PFN_UP(addr + len) - PFN_DOWN(addr),
maddr_to_mfn(addr),
mr_data->p2mt);
--
2.43.0
|
