[xen staging] x86/setup: correct off-by-1 in module mapping

[patchbot@xxxxxxx]

commit c3b54301fbe918c7e7e9c3b2dfe671c1ab79f882
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Mar 20 08:51:55 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Mar 20 08:51:55 2025 +0100

    x86/setup: correct off-by-1 in module mapping
    
    If a module's length is an exact multiple of PAGE_SIZE, the 2nd argument
    passed to set_pdx_range() would be one larger than intended. Use
    PFN_{UP,DOWN}() there instead.
    
    Fixes: cd7cc5320bb2 ("x86/boot: add start and size fields to struct 
boot_module")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index bde5d75ea6..715719213d 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1730,7 +1730,7 @@ void asmlinkage __init noreturn __start_xen(void)
     {
         unsigned long s = bi->mods[i].start, l = bi->mods[i].size;
 
-        set_pdx_range(paddr_to_pfn(s), paddr_to_pfn(s + l) + 1);
+        set_pdx_range(PFN_DOWN(s), PFN_UP(s + l));
         map_pages_to_xen((unsigned long)maddr_to_virt(s), maddr_to_mfn(s),
                          PFN_UP(l), PAGE_HYPERVISOR);
     }
--
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