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

Message ID 20170515140504.6461-3-punit.agrawal@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Punit Agrawal May 15, 2017, 2:05 p.m. UTC 
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@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
---
 xen/arch/arm/p2m.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 29f2e2fad3..07357bce7d 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1392,13 +1392,15 @@  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;