[Xen-devel] [For Xen-4.10 RFC PATCH 2/3] arm: p2m: Prevent redundant icache flushes

[Punit Agrawal <punit.agrawal@xxxxxxx>]

When toolstack requests flushing the caches, flush_page_to_ram() is
called for each page of the requested domain. This needs to unnecessary
icache invalidation operations.

Let's take the responsibility of performing icache operations and use
the recently introduced flag to prevent redundant icache operations by
flush_page_to_ram().

Signed-off-by: Punit Agrawal <punit.agrawal@xxxxxxx>
---
 xen/arch/arm/p2m.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 76cd1c34f3..8136522ed8 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1400,13 +1400,15 @@ int p2m_cache_flush(struct domain *d, gfn_t start, 
unsigned long nr)
         /* XXX: Implement preemption */
         while ( gfn_x(start) < gfn_x(next_gfn) )
         {
-            flush_page_to_ram(mfn_x(mfn), true);
+            flush_page_to_ram(mfn_x(mfn), false);
 
             start = gfn_add(start, 1);
             mfn = mfn_add(mfn, 1);
         }
     }
 
+    invalidate_icache();
+
     p2m_read_unlock(p2m);
 
     return 0;
-- 
2.11.0


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