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dirty bitmap: abstract its use

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Always use accessors to read/set the dirty bitmap.

Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Juan Quintela 2012-06-22 13:14:17 +02:00
parent 4508bd9ed8
commit 1720aeee72
2 changed files with 23 additions and 24 deletions
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44
exec-obsolete.h
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@ -45,57 +45,61 @@ int cpu_physical_memory_set_dirty_tracking(int enable);
#define CODE_DIRTY_FLAG 0x02
#define MIGRATION_DIRTY_FLAG 0x08
/* read dirty bit (return 0 or 1) */
static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
{
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] == 0xff;
}
static inline int cpu_physical_memory_get_dirty_flags(ram_addr_t addr)
{
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS];
}
/* read dirty bit (return 0 or 1) */
static inline int cpu_physical_memory_is_dirty(ram_addr_t addr)
{
return cpu_physical_memory_get_dirty_flags(addr) == 0xff;
}
static inline int cpu_physical_memory_get_dirty(ram_addr_t start,
ram_addr_t length,
int dirty_flags)
{
int ret = 0;
uint8_t *p;
ram_addr_t addr, end;
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS);
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
ret |= *p++ & dirty_flags;
ret |= cpu_physical_memory_get_dirty_flags(addr) & dirty_flags;
}
return ret;
}
static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
{
ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] = 0xff;
}
static inline int cpu_physical_memory_set_dirty_flags(ram_addr_t addr,
int dirty_flags)
{
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flags;
}
static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
{
cpu_physical_memory_set_dirty_flags(addr, 0xff);
}
static inline int cpu_physical_memory_clear_dirty_flags(ram_addr_t addr,
int dirty_flags)
{
int mask = ~dirty_flags;
return ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] &= mask;
}
static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
ram_addr_t length,
int dirty_flags)
{
uint8_t *p;
ram_addr_t addr, end;
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS);
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
*p++ |= dirty_flags;
cpu_physical_memory_set_dirty_flags(addr, dirty_flags);
}
}
@ -103,16 +107,12 @@ static inline void cpu_physical_memory_mask_dirty_range(ram_addr_t start,
ram_addr_t length,
int dirty_flags)
{
int mask;
uint8_t *p;
ram_addr_t addr, end;
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
mask = ~dirty_flags;
p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS);
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
*p++ &= mask;
cpu_physical_memory_clear_dirty_flags(addr, dirty_flags);
}
}

3
exec.c
View File

@ -2565,8 +2565,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
ram_list.phys_dirty = g_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);
cpu_physical_memory_set_dirty_range(new_block->offset, size, 0xff);
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);