[Xen-devel] [PATCH 05/22] xen/arm: p2m: Clean-up mfn_to_p2m_entry

[Julien Grall <julien.grall@xxxxxxx>]

The physical address is computed from the machine frame number, so
checking if the physical address is page aligned is pointless.

Furthermore, directly assigned the MFN to the corresponding field in the
entry rather than converting to a physical address and orring the value.
It will avoid to rely on the field position and make the code clearer.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/p2m.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 79095f1..d82349c 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -327,7 +327,6 @@ static void p2m_set_permission(lpae_t *e, p2m_type_t t, 
p2m_access_t a)
 static lpae_t mfn_to_p2m_entry(unsigned long mfn, unsigned int mattr,
                                p2m_type_t t, p2m_access_t a)
 {
-    paddr_t pa = ((paddr_t) mfn) << PAGE_SHIFT;
     /*
      * sh, xn and write bit will be defined in the following switches
      * based on mattr and t.
@@ -359,10 +358,9 @@ static lpae_t mfn_to_p2m_entry(unsigned long mfn, unsigned 
int mattr,
 
     p2m_set_permission(&e, t, a);
 
-    ASSERT(!(pa & ~PAGE_MASK));
-    ASSERT(!(pa & ~PADDR_MASK));
+    ASSERT(!(pfn_to_paddr(mfn) & ~PADDR_MASK));
 
-    e.bits |= pa;
+    e.p2m.base = mfn;
 
     return e;
 }
-- 
1.9.1


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