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Date: Wed, 28 Sep 2011 16:23:31 +0200
From: Jan Kiszka <jan.kiszka@siemens.com>
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Subject: [Qemu-devel] qemu-kvm: Role of flush_icache_range on PPC
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To: Alexander Graf <agraf@suse.de>
Cc: qemu-devel <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>

Alex,

we have this diff in qemu-kvm:

diff --git a/exec.c b/exec.c
index c1e045d..f188549 100644
--- a/exec.c
+++ b/exec.c
@@ -3950,6 +3955,11 @@ void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf,
                     cpu_physical_memory_set_dirty_flags(
                         addr1, (0xff & ~CODE_DIRTY_FLAG));
                 }
+		/* qemu doesn't execute guest code directly, but kvm does
+		   therefore flush instruction caches */
+		if (kvm_enabled())
+		    flush_icache_range((unsigned long)ptr,
+				       ((unsigned long)ptr)+l);
                 qemu_put_ram_ptr(ptr);
             }
         } else {


flush_icache_range() is doing something only on PPC hosts. So do we need
this upstream?

Jan

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