Xen devel - Jun 2011 - [PATCH v2] qemu_ram_ptr_length: take ram_addr_t as arguments

From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

qemu_ram_ptr_length should take ram_addr_t as argument rather than
target_phys_addr_t because is doing comparisons with RAMBlock addresses.

cpu_physical_memory_map should create a ram_addr_t address to pass to
qemu_ram_ptr_length from PhysPageDesc phys_offset.

Remove code after abort() in qemu_ram_ptr_length.


Changes in v2:

- handle 0 size in qemu_ram_ptr_length;

- rename addr1 to raddr;

- initialize raddr to ULONG_MAX.


Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 cpu-common.h |    2 +-
 exec.c       |   21 ++++++++++++++-------
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/cpu-common.h b/cpu-common.h
index b027e43..e4fcded 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -65,7 +65,7 @@ void qemu_ram_free_from_ptr(ram_addr_t addr);
 void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
 /* This should only be used for ram local to a device.  */
 void *qemu_get_ram_ptr(ram_addr_t addr);
-void *qemu_ram_ptr_length(target_phys_addr_t addr, target_phys_addr_t *size);
+void *qemu_ram_ptr_length(ram_addr_t addr, ram_addr_t *size);
 /* Same but slower, to use for migration, where the order of
  * RAMBlocks must not change. */
 void *qemu_safe_ram_ptr(ram_addr_t addr);
diff --git a/exec.c b/exec.c
index 7f14332..7d7c2b2 100644
--- a/exec.c
+++ b/exec.c
@@ -3135,8 +3135,11 @@ void *qemu_safe_ram_ptr(ram_addr_t addr)
 
 /* Return a host pointer to guest''s ram. Similar to qemu_get_ram_ptr
  * but takes a size argument */
-void *qemu_ram_ptr_length(target_phys_addr_t addr, target_phys_addr_t *size)
+void *qemu_ram_ptr_length(ram_addr_t addr, ram_addr_t *size)
 {
+    if (*size == 0) {
+        return NULL;
+    }
     if (xen_mapcache_enabled())
         return qemu_map_cache(addr, *size, 1);
     else {
@@ -3152,9 +3155,6 @@ void *qemu_ram_ptr_length(target_phys_addr_t addr,
target_phys_addr_t *size)
 
         fprintf(stderr, "Bad ram offset %" PRIx64 "\n",
(uint64_t)addr);
         abort();
-
-        *size = 0;
-        return NULL;
     }
 }
 
@@ -4020,7 +4020,9 @@ void *cpu_physical_memory_map(target_phys_addr_t addr,
     target_phys_addr_t page;
     unsigned long pd;
     PhysPageDesc *p;
-    target_phys_addr_t addr1 = addr;
+    ram_addr_t raddr = ULONG_MAX;
+    ram_addr_t rlen;
+    void *ret;
 
     while (len > 0) {
         page = addr & TARGET_PAGE_MASK;
@@ -4048,13 +4050,18 @@ void *cpu_physical_memory_map(target_phys_addr_t addr,
             *plen = l;
             return bounce.buffer;
         }
+        if (!todo) {
+            raddr = (pd & TARGET_PAGE_MASK) + (addr &
~TARGET_PAGE_MASK);
+        }
 
         len -= l;
         addr += l;
         todo += l;
     }
-    *plen = todo;
-    return qemu_ram_ptr_length(addr1, plen);
+    rlen = todo;
+    ret = qemu_ram_ptr_length(raddr, &rlen);
+    *plen = rlen;
+    return ret;
 }
 
 /* Unmaps a memory region previously mapped by cpu_physical_memory_map().
-- 
1.7.2.3


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On 27 June 2011 18:26,  <stefano.stabellini@eu.citrix.com>
wrote:
> From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
>
> qemu_ram_ptr_length should take ram_addr_t as argument rather than
> target_phys_addr_t because is doing comparisons with RAMBlock addresses.
>
> cpu_physical_memory_map should create a ram_addr_t address to pass to
> qemu_ram_ptr_length from PhysPageDesc phys_offset.
>
> Remove code after abort() in qemu_ram_ptr_length.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

Tested and confirmed this fixes vexpress and looks good to me -- thanks.

-- PMM

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On 06/27/2011 07:26 PM, stefano.stabellini@eu.citrix.com
wrote:
> From: Stefano Stabellini<stefano.stabellini@eu.citrix.com>
>
> qemu_ram_ptr_length should take ram_addr_t as argument rather than
> target_phys_addr_t because is doing comparisons with RAMBlock addresses.
>
> cpu_physical_memory_map should create a ram_addr_t address to pass to
> qemu_ram_ptr_length from PhysPageDesc phys_offset.
>
> Remove code after abort() in qemu_ram_ptr_length.
>
>
> Changes in v2:
>
> - handle 0 size in qemu_ram_ptr_length;
>
> - rename addr1 to raddr;
>
> - initialize raddr to ULONG_MAX.
>
Thanks, applied to the xen-next branch.


Alex


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