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Add qemu_ram_alloc_from_ptr function

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Provide a function to add an allocated region of memory to the qemu RAM.

This patch is copied from Marcelo's qemu_ram_map() in qemu-kvm and given the
clearer name qemu_ram_alloc_from_ptr().

Signed-off-by: Cam Macdonell <cam@cs.ualberta.ca>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Cam Macdonell 2010-07-26 18:10:57 -06:00 committed by Anthony Liguori
parent f040236cd5
commit 84b89d782f
2 changed files with 45 additions and 0 deletions
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2
cpu-common.h
View File

@ -40,6 +40,8 @@ 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_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(ram_addr_t addr);
/* This should only be used for ram local to a device. */

43
exec.c
View File

@ -2808,6 +2808,49 @@ static ram_addr_t last_ram_offset(void)
return last;
}
ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev, const char *name,
ram_addr_t size, void *host)
{
RAMBlock *new_block, *block;
size = TARGET_PAGE_ALIGN(size);
new_block = qemu_mallocz(sizeof(*new_block));
if (dev && dev->parent_bus && dev->parent_bus->info->get_dev_path) {
char *id = dev->parent_bus->info->get_dev_path(dev);
if (id) {
snprintf(new_block->idstr, sizeof(new_block->idstr), "%s/", id);
qemu_free(id);
}
}
pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (!strcmp(block->idstr, new_block->idstr)) {
fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
new_block->idstr);
abort();
}
}
new_block->host = host;
new_block->offset = find_ram_offset(size);
new_block->length = size;
QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
ram_list.phys_dirty = qemu_realloc(ram_list.phys_dirty,
last_ram_offset() >> TARGET_PAGE_BITS);
memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
0xff, size >> TARGET_PAGE_BITS);
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);
return new_block->offset;
}
ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
{
RAMBlock *new_block, *block;