[PATCH v2 1/3] memory: drop guest writes to read-only ram device regions

[Yan Zhao]

for ram device regions, drop guest writes if the regions is read-only.

Signed-off-by: Yan Zhao <yan.y.z...@intel.com>
Signed-off-by: Xin Zeng <xin.z...@intel.com>
---
 memory.c     | 6 +++++-
 trace-events | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/memory.c b/memory.c
index 601b749906..a380b59980 100644
--- a/memory.c
+++ b/memory.c
@@ -1312,7 +1312,11 @@ static void memory_region_ram_device_write(void *opaque, 
hwaddr addr,
 {
     MemoryRegion *mr = opaque;
 
-    trace_memory_region_ram_device_write(get_cpu_index(), mr, addr, data, 
size);
+    trace_memory_region_ram_device_write(get_cpu_index(), mr, addr, data,
+                                         size, mr->readonly);
+    if (mr->readonly) {
+        return;
+    }
 
     switch (size) {
     case 1:
diff --git a/trace-events b/trace-events
index 42107ebc69..e1de662973 100644
--- a/trace-events
+++ b/trace-events
@@ -61,7 +61,7 @@ memory_region_ops_write(int cpu_index, void *mr, uint64_t 
addr, uint64_t value,
 memory_region_subpage_read(int cpu_index, void *mr, uint64_t offset, uint64_t 
value, unsigned size) "cpu %d mr %p offset 0x%"PRIx64" value 0x%"PRIx64" size 
%u"
 memory_region_subpage_write(int cpu_index, void *mr, uint64_t offset, uint64_t 
value, unsigned size) "cpu %d mr %p offset 0x%"PRIx64" value 0x%"PRIx64" size 
%u"
 memory_region_ram_device_read(int cpu_index, void *mr, uint64_t addr, uint64_t 
value, unsigned size) "cpu %d mr %p addr 0x%"PRIx64" value 0x%"PRIx64" size %u"
-memory_region_ram_device_write(int cpu_index, void *mr, uint64_t addr, 
uint64_t value, unsigned size) "cpu %d mr %p addr 0x%"PRIx64" value 0x%"PRIx64" 
size %u"
+memory_region_ram_device_write(int cpu_index, void *mr, uint64_t addr, 
uint64_t value, unsigned size, bool readonly) "cpu %d mr %p addr 0x%"PRIx64" 
value 0x%"PRIx64" size %u" " is_readonly_region=%d"
 flatview_new(void *view, void *root) "%p (root %p)"
 flatview_destroy(void *view, void *root) "%p (root %p)"
 flatview_destroy_rcu(void *view, void *root) "%p (root %p)"
-- 
2.17.1