[uq/master patch 5/5] introduce qemu_ram_map

Marcelo Tosatti
2010-04-23T17:08:46Z

[-- Attachment #1: qemu-ram-mmap --]
[-- Type: text/plain, Size: 1691 bytes --]

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

CC: Cam Macdonell <cam@cs.ualberta.ca>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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;