[Xen-changelog] [xen stable-4.8] arm: p2m: Prevent redundant icache flushes

[patchbot@xxxxxxx]

commit 1e6c88fafcb4664a501239d1d8665c34b5384648
Author:     Punit Agrawal <punit.agrawal@xxxxxxx>
AuthorDate: Fri May 26 12:14:06 2017 +0100
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Jul 7 11:00:22 2017 -0700

    arm: p2m: Prevent redundant icache flushes
    
    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>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    (cherry picked from commit 1a0c3e3e28d6cd072734990efcaaec608bf152b1)
---
 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 8b6b150..720ef13 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1469,13 +1469,15 @@ 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;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

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