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ram_blocks: Convert to a QLIST

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This makes the RAM block list easier to manipulate.  Also incorporate
relevant variables into the RAMList struct.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Chris Wright <chrisw@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Alex Williamson 2010-06-11 11:11:42 -06:00 • committed by Anthony Liguori
parent 2ffcb18de0
commit f471a17e9d
3 changed files with 54 additions and 66 deletions
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78
exec.c
View file

@ -110,21 +110,9 @@ uint8_t *code_gen_ptr;
#if !defined(CONFIG_USER_ONLY)
int phys_ram_fd;
uint8_t *phys_ram_dirty;
static int in_migration;
typedef struct RAMBlock {
uint8_t *host;
ram_addr_t offset;
ram_addr_t length;
struct RAMBlock *next;
} RAMBlock;
static RAMBlock *ram_blocks;
/* TODO: When we implement (and use) ram deallocation (e.g. for hotplug)
then we can no longer assume contiguous ram offsets, and external uses
of this variable will break. */
ram_addr_t last_ram_offset;
RAMList ram_list = { .blocks = QLIST_HEAD_INITIALIZER(ram_list) };
#endif
CPUState *first_cpu;
@ -2810,18 +2798,17 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
madvise(new_block->host, size, MADV_MERGEABLE);
#endif
}
new_block->offset = last_ram_offset;
new_block->offset = ram_list.last_offset;
new_block->length = size;
new_block->next = ram_blocks;
ram_blocks = new_block;
QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
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),
ram_list.phys_dirty = qemu_realloc(ram_list.phys_dirty,
(ram_list.last_offset + size) >> TARGET_PAGE_BITS);
memset(ram_list.phys_dirty + (ram_list.last_offset >> TARGET_PAGE_BITS),
0xff, size >> TARGET_PAGE_BITS);
last_ram_offset += size;
ram_list.last_offset += size;
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);
@ -2844,31 +2831,20 @@ void qemu_ram_free(ram_addr_t addr)
*/
void *qemu_get_ram_ptr(ram_addr_t addr)
{
RAMBlock *prev;
RAMBlock **prevp;
RAMBlock *block;
prev = NULL;
prevp = &ram_blocks;
block = ram_blocks;
while (block && (block->offset > addr
|| block->offset + block->length <= addr)) {
if (prev)
prevp = &prev->next;
prev = block;
block = block->next;
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (addr - block->offset < block->length) {
QLIST_REMOVE(block, next);
QLIST_INSERT_HEAD(&ram_list.blocks, block, next);
return block->host + (addr - block->offset);
}
}
if (!block) {
fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr);
abort();
}
/* Move this entry to to start of the list. */
if (prev) {
prev->next = block->next;
block->next = *prevp;
*prevp = block;
}
return block->host + (addr - block->offset);
fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr);
abort();
return NULL;
}
/* Some of the softmmu routines need to translate from a host pointer
@ -2878,16 +2854,16 @@ ram_addr_t qemu_ram_addr_from_host(void *ptr)
RAMBlock *block;
uint8_t *host = ptr;
block = ram_blocks;
while (block && (block->host > host
|| block->host + block->length <= host)) {
block = block->next;
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (host - block->host < block->length) {
return block->offset + (host - block->host);
}
}
if (!block) {
fprintf(stderr, "Bad ram pointer %p\n", ptr);
abort();
}
return block->offset + (host - block->host);
fprintf(stderr, "Bad ram pointer %p\n", ptr);
abort();
return 0;
}
static uint32_t unassigned_mem_readb(void *opaque, target_phys_addr_t addr)