[Qemu-devel] [PATCH] exec: Implement qemu_ram_free_from_ptr()

[Alex Williamson <alex.williamson@redhat.com>]

Required for regions mapped via qemu_ram_alloc_from_ptr().  VFIO
will make use of this to remove mappings when devices are hot
unplugged.  (Current callers of qemu_ram_alloc_from_ptr() should
probably need this too)

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 cpu-common.h |    1 +
 exec.c       |   13 +++++++++++++
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/cpu-common.h b/cpu-common.h
index a543b5d..8a3d1da 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -43,6 +43,7 @@ ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr);
 ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
                         ram_addr_t size, void *host);
 ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size);
+void qemu_ram_free_from_ptr(ram_addr_t addr);
 void qemu_ram_free(ram_addr_t addr);
 /* This should only be used for ram local to a device.  */
 void *qemu_get_ram_ptr(ram_addr_t addr);
diff --git a/exec.c b/exec.c
index 631d8c5..2b3b9ba 100644
--- a/exec.c
+++ b/exec.c
@@ -2882,6 +2882,19 @@ ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
     return qemu_ram_alloc_from_ptr(dev, name, size, NULL);
 }
 
+void qemu_ram_free_from_ptr(ram_addr_t addr)
+{
+    RAMBlock *block;
+
+    QLIST_FOREACH(block, &ram_list.blocks, next) {
+        if (addr == block->offset) {
+            QLIST_REMOVE(block, next);
+            qemu_free(block);
+            return;
+        }
+    }
+}
+
 void qemu_ram_free(ram_addr_t addr)
 {
     RAMBlock *block;