[xen staging] arm/mpu: Implement remove_early_mappings for MPU systems

[patchbot@xxxxxxx]

commit 5f720152d56140765cf9f85303fb4c81b1b44d7e
Author:     Luca Fancellu <luca.fancellu@xxxxxxx>
AuthorDate: Mon Jul 21 09:31:47 2025 +0100
Commit:     Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Wed Jul 23 09:51:55 2025 +0200

    arm/mpu: Implement remove_early_mappings for MPU systems
    
    Implement remove_early_mappings for MPU systems.
    
    Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Signed-off-by: Hari Limaye <hari.limaye@xxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/mpu/setup.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/mpu/setup.c b/xen/arch/arm/mpu/setup.c
index 2ef703757f..163573b932 100644
--- a/xen/arch/arm/mpu/setup.c
+++ b/xen/arch/arm/mpu/setup.c
@@ -96,7 +96,11 @@ void __init copy_from_paddr(void *dst, paddr_t paddr, 
unsigned long len)
 
 void __init remove_early_mappings(void)
 {
-    BUG_ON("unimplemented");
+    int rc = destroy_xen_mappings(round_pgdown(mapped_fdt_base),
+                                  mapped_fdt_limit);
+
+    if ( rc )
+        panic("Unable to unmap the device-tree\n");
 }
 
 /*
--
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