[PATCH] KVM: Qemu: Flush i-cache after ide-dma operation in IA64

From 3b706bda62fbddfa2bca414d8c0fb7cda904b7db Mon Sep 17 00:00:00 2001
From: Yang Zhang <Yang Zhang>
Date: Wed, 1 Apr 2009 01:50:53 -0400
Subject: [PATCH] KVM: Qemu: Flush i-cache after ide-dma operation in IA64

The data from dma will include instructions. In order to exeuting the right
instruction, we should to flush the i-cache to ensure those data can be see 
by cpu.

Signed-off-by: Xiantao Zhang <[email protected]>
Signed-off-by: Yang Zhang <Yang Zhang>
---
 qemu/cache-utils.h |   14 ++++++++++++++
 qemu/cutils.c      |    3 +++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/qemu/cache-utils.h b/qemu/cache-utils.h
index b45fde4..5e11d12 100644
--- a/qemu/cache-utils.h
+++ b/qemu/cache-utils.h
@@ -33,8 +33,22 @@ static inline void flush_icache_range(unsigned long start, unsigned long stop)
     asm volatile ("sync" : : : "memory");
     asm volatile ("isync" : : : "memory");
 }
+#define qemu_sync_idcache flush_icache_range
+#else
 
+#ifdef __ia64__
+static inline void qemu_sync_idcache(unsigned long start, unsigned long stop)
+{
+    while (start < stop) {
+	    asm volatile ("fc %0" :: "r"(start));
+	    start += 32;
+    }
+    asm volatile (";;sync.i;;srlz.i;;");
+}
 #else
+static inline void qemu_sync_idcache(unsigned long start, unsigned long stop)
+#endif
+
 #define qemu_cache_utils_init(envp) do { (void) (envp); } while (0)
 #endif
 
diff --git a/qemu/cutils.c b/qemu/cutils.c
index 5b36cc6..7b57173 100644
--- a/qemu/cutils.c
+++ b/qemu/cutils.c
@@ -23,6 +23,7 @@
  */
 #include "qemu-common.h"
 #include "host-utils.h"
+#include "cache-utils.h"
 #include <assert.h>
 
 void pstrcpy(char *buf, int buf_size, const char *str)
@@ -215,6 +216,8 @@ void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count)
         if (copy > qiov->iov[i].iov_len)
             copy = qiov->iov[i].iov_len;
         memcpy(qiov->iov[i].iov_base, p, copy);
+        qemu_sync_idcache((unsigned long)qiov->iov[i].iov_base, 
+                    (unsigned long)(qiov->iov[i].iov_base + copy));
         p     += copy;
         count -= copy;
     }
-- 
1.6.0.rc1