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qemu_ram_free: Implement it

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Now that we can support a ram_addr_t space with holes, we can implement
qemu_ram_free().

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Alex Williamson 2010-07-02 11:13:17 -06:00 committed by Anthony Liguori
parent a55bbe3187
commit 04b1665372
2 changed files with 61 additions and 4 deletions
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3
cpu-all.h
View file

@ -867,6 +867,9 @@ typedef struct RAMBlock {
ram_addr_t length;
char idstr[256];
QLIST_ENTRY(RAMBlock) next;
#if defined(__linux__) && !defined(TARGET_S390X)
int fd;
#endif
} RAMBlock;
typedef struct RAMList {

62
exec.c
View file

@ -2701,7 +2701,9 @@ static long gethugepagesize(const char *path)
return fs.f_bsize;
}
static void *file_ram_alloc(ram_addr_t memory, const char *path)
static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
const char *path)
{
char *filename;
void *area;
@ -2764,11 +2766,38 @@ static void *file_ram_alloc(ram_addr_t memory, const char *path)
close(fd);
return (NULL);
}
block->fd = fd;
return area;
}
#endif
static ram_addr_t find_ram_offset(ram_addr_t size)
{
RAMBlock *block, *next_block;
ram_addr_t offset, mingap = ULONG_MAX;
if (QLIST_EMPTY(&ram_list.blocks))
return 0;
QLIST_FOREACH(block, &ram_list.blocks, next) {
ram_addr_t end, next = ULONG_MAX;
end = block->offset + block->length;
QLIST_FOREACH(next_block, &ram_list.blocks, next) {
if (next_block->offset >= end) {
next = MIN(next, next_block->offset);
}
}
if (next - end >= size && next - end < mingap) {
offset = end;
mingap = next - end;
}
}
return offset;
}
static ram_addr_t last_ram_offset(void)
{
RAMBlock *block;
ram_addr_t last = 0;
@ -2812,7 +2841,7 @@ ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
if (mem_path) {
#if defined (__linux__) && !defined(TARGET_S390X)
new_block->host = file_ram_alloc(size, mem_path);
new_block->host = file_ram_alloc(new_block, size, mem_path);
if (!new_block->host) {
new_block->host = qemu_vmalloc(size);
#ifdef MADV_MERGEABLE
@ -2842,7 +2871,7 @@ ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
QLIST_INSERT_HEAD(&ram_list.blocks, new_block, next);
ram_list.phys_dirty = qemu_realloc(ram_list.phys_dirty,
(new_block->offset + size) >> TARGET_PAGE_BITS);
last_ram_offset() >> TARGET_PAGE_BITS);
memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
0xff, size >> TARGET_PAGE_BITS);
@ -2854,7 +2883,32 @@ ram_addr_t qemu_ram_alloc(DeviceState *dev, const char *name, ram_addr_t size)
void qemu_ram_free(ram_addr_t addr)
{
/* TODO: implement this. */
RAMBlock *block;
QLIST_FOREACH(block, &ram_list.blocks, next) {
if (addr == block->offset) {
QLIST_REMOVE(block, next);
if (mem_path) {
#if defined (__linux__) && !defined(TARGET_S390X)
if (block->fd) {
munmap(block->host, block->length);
close(block->fd);
} else {
qemu_vfree(block->host);
}
#endif
} else {
#if defined(TARGET_S390X) && defined(CONFIG_KVM)
munmap(block->host, block->length);
#else
qemu_vfree(block->host);
#endif
}
qemu_free(block);
return;
}
}
}
/* Return a host pointer to ram allocated with qemu_ram_alloc.