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[Qemu-devel] [PATCH 10/10] introduce qemu_ram_map


From: Marcelo Tosatti
Subject: [Qemu-devel] [PATCH 10/10] introduce qemu_ram_map
Date: Mon, 26 Apr 2010 14:59:06 -0300

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>
---
 cpu-common.h |    1 +
 exec.c       |   28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/cpu-common.h b/cpu-common.h
index b24cecc..2dfde6f 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -40,6 +40,7 @@ static inline void 
cpu_register_physical_memory(target_phys_addr_t start_addr,
 }
 
 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.  */
diff --git a/exec.c b/exec.c
index 14d1fd7..648a9c9 100644
--- a/exec.c
+++ b/exec.c
@@ -2789,6 +2789,34 @@ static void *file_ram_alloc(ram_addr_t memory, const 
char *path)
 }
 #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;
-- 
1.6.6.1





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