[xen staging] Arm: relax iomem_access_permitted() check

[patchbot@xxxxxxx]

commit 475715d65a1084fd38c5baa12c18d1e2f5f74ea0
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Aug 19 13:37:42 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Aug 19 13:37:42 2021 +0200

    Arm: relax iomem_access_permitted() check
    
    Ranges checked by iomem_access_permitted() are inclusive; to permit a
    mapping there's no need for access to also have been granted for the
    subsequent page.
    
    Fixes: 80f9c3167084 ("xen/arm: acpi: Map MMIO on fault in stage-2 page 
table for the hardware domain")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/arch/arm/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 4ccb6e7d18..219ab3c3fb 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1893,7 +1893,7 @@ static bool try_map_mmio(gfn_t gfn)
         return false;
 
     /* The hardware domain can only map permitted MMIO regions */
-    if ( !iomem_access_permitted(d, mfn_x(mfn), mfn_x(mfn) + 1) )
+    if ( !iomem_access_permitted(d, mfn_x(mfn), mfn_x(mfn)) )
         return false;
 
     return !map_regions_p2mt(d, gfn, 1, mfn, p2m_mmio_direct_c);
--
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