[Qemu-devel] [PATCH] Fix phys memory client - pass guest physical address not region offset

[Alex Williamson]

When we're trying to get a newly registered phys memory client updated
with the current page mappings, we end up passing the region offset
(a ram_addr_t) as the start address rather than the actual guest
physical memory address (target_phys_addr_t).  If your guest has less
than 3.5G of memory, these are coincidentally the same thing.  If
there's more, the region offset for the memory above 4G starts over
at 0, so the set_memory client will overwrite it's lower memory entries.

Instead, keep track of the guest phsyical address as we're walking the
tables and pass that to the set_memory client.

Signed-off-by: Alex Williamson <address@hidden>
---

 exec.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/exec.c b/exec.c
index 4752af1..e670929 100644
--- a/exec.c
+++ b/exec.c
@@ -1742,7 +1742,7 @@ static int cpu_notify_migration_log(int enable)
 }
 
 static void phys_page_for_each_1(CPUPhysMemoryClient *client,
-                                 int level, void **lp)
+                                 int level, void **lp, target_phys_addr_t addr)
 {
     int i;
 
@@ -1751,16 +1751,18 @@ static void phys_page_for_each_1(CPUPhysMemoryClient 
*client,
     }
     if (level == 0) {
         PhysPageDesc *pd = *lp;
+        addr <<= L2_BITS + TARGET_PAGE_BITS;
         for (i = 0; i < L2_SIZE; ++i) {
             if (pd[i].phys_offset != IO_MEM_UNASSIGNED) {
-                client->set_memory(client, pd[i].region_offset,
+                client->set_memory(client, addr | i << TARGET_PAGE_BITS,
                                    TARGET_PAGE_SIZE, pd[i].phys_offset);
             }
         }
     } else {
         void **pp = *lp;
         for (i = 0; i < L2_SIZE; ++i) {
-            phys_page_for_each_1(client, level - 1, pp + i);
+            phys_page_for_each_1(client, level - 1, pp + i,
+                                 (addr << L2_BITS) | i);
         }
     }
 }
@@ -1770,7 +1772,7 @@ static void phys_page_for_each(CPUPhysMemoryClient 
*client)
     int i;
     for (i = 0; i < P_L1_SIZE; ++i) {
         phys_page_for_each_1(client, P_L1_SHIFT / L2_BITS - 1,
-                             l1_phys_map + i);
+                             l1_phys_map + i, i);
     }
 }