[Qemu-devel] [uq/master patch 5/5] introduce qemu_ram_map

[Marcelo Tosatti]

Which allows drivers to register an mmaped region into ram block mappings.
To be used by device assignment driver.

CC: Cam Macdonell <address@hidden>
Signed-off-by: Marcelo Tosatti <address@hidden>

Index: qemu-kvm/cpu-common.h
===================================================================
--- qemu-kvm.orig/cpu-common.h
+++ qemu-kvm/cpu-common.h
@@ -32,6 +32,7 @@ static inline void cpu_register_physical
 }
 
 ram_addr_t cpu_get_physical_page_desc(target_phys_addr_t addr);
+ram_addr_t qemu_ram_map(ram_addr_t size, void *host);
 ram_addr_t qemu_ram_alloc(ram_addr_t);
 void qemu_ram_free(ram_addr_t addr);
 /* This should only be used for ram local to a device.  */
Index: qemu-kvm/exec.c
===================================================================
--- qemu-kvm.orig/exec.c
+++ qemu-kvm/exec.c
@@ -2710,6 +2710,34 @@ static void *file_ram_alloc(ram_addr_t m
 }
 #endif
 
+ram_addr_t qemu_ram_map(ram_addr_t size, void *host)
+{
+    RAMBlock *new_block;
+
+    size = TARGET_PAGE_ALIGN(size);
+    new_block = qemu_malloc(sizeof(*new_block));
+
+    new_block->host = host;
+
+    new_block->offset = last_ram_offset;
+    new_block->length = size;
+
+    new_block->next = ram_blocks;
+    ram_blocks = new_block;
+
+    phys_ram_dirty = qemu_realloc(phys_ram_dirty,
+        (last_ram_offset + size) >> TARGET_PAGE_BITS);
+    memset(phys_ram_dirty + (last_ram_offset >> TARGET_PAGE_BITS),
+           0xff, size >> TARGET_PAGE_BITS);
+
+    last_ram_offset += size;
+
+    if (kvm_enabled())
+        kvm_setup_guest_memory(new_block->host, size);
+
+    return new_block->offset;
+}
+
 ram_addr_t qemu_ram_alloc(ram_addr_t size)
 {
     RAMBlock *new_block;