[xen staging] arm/mpu: Add HYPERVISOR_VIRT_START and avoid a check in xen.lds.S

[patchbot@xxxxxxx]

commit db72a5b2d2eaebc1e050def3fb9b73f43d10cdb0
Author:     Luca Fancellu <luca.fancellu@xxxxxxx>
AuthorDate: Tue Apr 1 09:58:52 2025 +0100
Commit:     Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Wed Apr 2 11:15:10 2025 +0200

    arm/mpu: Add HYPERVISOR_VIRT_START and avoid a check in xen.lds.S
    
    The define HYPERVISOR_VIRT_START is required by the common code,
    even if MPU system doesn't use virtual memory, define it in
    mpu/layout.h in order to reuse existing code.
    
    Disable a check in the linker script for arm for !MMU systems.
    
    Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/include/asm/mpu/layout.h | 2 ++
 xen/arch/arm/xen.lds.S                | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/xen/arch/arm/include/asm/mpu/layout.h 
b/xen/arch/arm/include/asm/mpu/layout.h
index d6d397f4c2..248e55f888 100644
--- a/xen/arch/arm/include/asm/mpu/layout.h
+++ b/xen/arch/arm/include/asm/mpu/layout.h
@@ -22,6 +22,8 @@
  */
 #define XEN_VIRT_START         _AT(paddr_t, XEN_START_ADDRESS)
 
+#define HYPERVISOR_VIRT_START  XEN_VIRT_START
+
 #endif /* __ARM_MPU_LAYOUT_H__ */
 /*
  * Local variables:
diff --git a/xen/arch/arm/xen.lds.S b/xen/arch/arm/xen.lds.S
index 325b8059fd..86a6e311cf 100644
--- a/xen/arch/arm/xen.lds.S
+++ b/xen/arch/arm/xen.lds.S
@@ -237,4 +237,6 @@ ASSERT(IS_ALIGNED(__bss_start,      POINTER_ALIGN), 
"__bss_start is misaligned")
 ASSERT(IS_ALIGNED(__bss_end,        POINTER_ALIGN), "__bss_end is misaligned")
 /* To simplify the logic in head.S, we want to _end to be page aligned */
 ASSERT(IS_ALIGNED(_end,             PAGE_SIZE), "_end is not page aligned")
+#ifdef CONFIG_MMU
 ASSERT((_end - _start) <= XEN_VIRT_SIZE, "Xen is too big")
+#endif
--
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