[xen staging] xen/dom0less: abstract Arm-specific p2m type name for device MMIO mappings

[patchbot@xxxxxxx]

commit 5bcbcc2565775eb21d052fa2befdffbc63c0ea41
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Tue Dec 16 17:55:18 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Dec 18 14:23:42 2025 +0100

    xen/dom0less: abstract Arm-specific p2m type name for device MMIO mappings
    
    Introduce arch_dt_passthrough_p2m_type() and use it instead of
    `p2m_mmio_direct_dev` to avoid leaking Arm-specific naming into
    common Xen code, such as dom0less passthrough property handling.
    
    This helps reduce platform-specific terminology in shared logic and
    improves clarity for future non-Arm ports (e.g. RISC-V or PowerPC).
    
    No functional changes â?? the definition is preserved via a static inline
    function for Arm.
    
    Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/include/asm/p2m.h          | 5 +++++
 xen/common/device-tree/dom0less-build.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/include/asm/p2m.h b/xen/arch/arm/include/asm/p2m.h
index ef98bc5f4d..010ce8c9eb 100644
--- a/xen/arch/arm/include/asm/p2m.h
+++ b/xen/arch/arm/include/asm/p2m.h
@@ -137,6 +137,11 @@ typedef enum {
     p2m_max_real_type,  /* Types after this won't be store in the p2m */
 } p2m_type_t;
 
+static inline p2m_type_t arch_dt_passthrough_p2m_type(void)
+{
+    return p2m_mmio_direct_dev;
+}
+
 /* We use bitmaps and mask to handle groups of types */
 #define p2m_to_mask(_t) (1UL << (_t))
 
diff --git a/xen/common/device-tree/dom0less-build.c 
b/xen/common/device-tree/dom0less-build.c
index 2600350a3c..495ef7b16a 100644
--- a/xen/common/device-tree/dom0less-build.c
+++ b/xen/common/device-tree/dom0less-build.c
@@ -185,7 +185,7 @@ static int __init handle_passthrough_prop(struct 
kernel_info *kinfo,
                                gaddr_to_gfn(gstart),
                                PFN_DOWN(size),
                                maddr_to_mfn(mstart),
-                               p2m_mmio_direct_dev);
+                               arch_dt_passthrough_p2m_type());
         if ( res < 0 )
         {
             printk(XENLOG_ERR
--
generated by git-patchbot for /home/xen/git/xen.git#staging