[xen staging] xen/arm: fix iomem_ranges cfg in map_range_to_domain()

[patchbot@xxxxxxx]

commit e0daeac7b1d7a4cbdb7365b4eccf6ad398caea83
Author:     Grygorii Strashko <gragst.linux@xxxxxxxxx>
AuthorDate: Tue Feb 18 13:22:53 2025 +0200
Commit:     Julien Grall <julien@xxxxxxx>
CommitDate: Wed Mar 12 19:47:04 2025 +0000

    xen/arm: fix iomem_ranges cfg in map_range_to_domain()
    
    Now the following code in map_range_to_domain()
    
     res = rangeset_add_range(mr_data->iomem_ranges,
                              paddr_to_pfn(addr),
                              paddr_to_pfn_aligned(addr + len - 1));
     where
      paddr_to_pfn_aligned(paddr) defined as paddr_to_pfn(PAGE_ALIGN(paddr))
    
    calculates the iomem range end address by rounding it up to the next Xen
    page with incorrect assumption that iomem range end address passed to
    rangeset_add_range() is exclusive, while it is expected to be inclusive.
    
    For example, if requested range is [00e6140000:00e6141004] then it expected
    to add [e6140:e6141] range (num_pages=2) to the mr_data->iomem_ranges
    rangeset, but will add [e6140:e6142] (num_pages=3) instead.
    
    To fix it, drop PAGE_ALIGN() from the iomem range end address calculation
    formula and just use paddr_to_pfn(addr + len - 1).
    
    Fixes: 57d4d7d4e8f3b (arm/asm/setup.h: Update struct map_range_data to add 
rangeset.")
    Signed-off-by: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 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 97e613e06a..5e1c1cc326 100644
--- a/xen/arch/arm/device.c
+++ b/xen/arch/arm/device.c
@@ -107,7 +107,7 @@ int map_range_to_domain(const struct dt_device_node *dev,
     {
         res = rangeset_add_range(mr_data->iomem_ranges,
                                  paddr_to_pfn(addr),
-                                 paddr_to_pfn_aligned(addr + len - 1));
+                                 paddr_to_pfn(addr + len - 1));
         if ( res )
             return res;
     }
--
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