unicorn/qemu/include/exec/ram_addr.h
Stefan Hajnoczi fc7b95d06a
memory: replace cpu_physical_memory_reset_dirty() with test-and-clear
The cpu_physical_memory_reset_dirty() function is sometimes used
together with cpu_physical_memory_get_dirty(). This is not atomic since
two separate accesses to the dirty memory bitmap are made.

Turn cpu_physical_memory_reset_dirty() and
cpu_physical_memory_clear_dirty_range_type() into the atomic
cpu_physical_memory_test_and_clear_dirty().

Backports commit 03eebc9e3246b9b3f5925aa41f7dfd7c1e467875 from qemu
2018-02-13 11:25:45 -05:00

180 lines
6.3 KiB
C

/*
* Declarations for cpu physical memory functions
*
* Copyright 2011 Red Hat, Inc. and/or its affiliates
*
* Authors:
* Avi Kivity <avi@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*
*/
/*
* This header is for use by exec.c and memory.c ONLY. Do not include it.
* The functions declared here will be removed soon.
*/
#ifndef RAM_ADDR_H
#define RAM_ADDR_H
#include "uc_priv.h"
#ifndef CONFIG_USER_ONLY
ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
MemoryRegion *mr, Error **errp);
ram_addr_t qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp);
int qemu_get_ram_fd(struct uc_struct *uc, ram_addr_t addr);
void *qemu_get_ram_block_host_ptr(struct uc_struct *uc, ram_addr_t addr);
void *qemu_get_ram_ptr(struct uc_struct *uc, ram_addr_t addr);
void qemu_ram_free(struct uc_struct *c, ram_addr_t addr);
void qemu_ram_free_from_ptr(struct uc_struct *uc, ram_addr_t addr);
#define DIRTY_CLIENTS_ALL ((1 << DIRTY_MEMORY_NUM) - 1)
#define DIRTY_CLIENTS_NOCODE (DIRTY_CLIENTS_ALL & ~(1 << DIRTY_MEMORY_CODE))
static inline bool cpu_physical_memory_get_dirty(struct uc_struct *uc, ram_addr_t start,
ram_addr_t length,
unsigned client)
{
unsigned long end, page, next;
assert(client < DIRTY_MEMORY_NUM);
end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
page = start >> TARGET_PAGE_BITS;
next = find_next_bit(uc->ram_list.dirty_memory[client], end, page);
return next < end;
}
static inline bool cpu_physical_memory_all_dirty(struct uc_struct *uc, ram_addr_t start,
ram_addr_t length,
unsigned client)
{
unsigned long end, page, next;
assert(client < DIRTY_MEMORY_NUM);
end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
page = start >> TARGET_PAGE_BITS;
next = find_next_zero_bit(uc->ram_list.dirty_memory[client], end, page);
return next >= end;
}
static inline bool cpu_physical_memory_get_dirty_flag(struct uc_struct *uc, ram_addr_t addr,
unsigned client)
{
return cpu_physical_memory_get_dirty(uc, addr, 1, client);
}
static inline bool cpu_physical_memory_is_clean(struct uc_struct *uc, ram_addr_t addr)
{
return !cpu_physical_memory_get_dirty_flag(uc, addr, DIRTY_MEMORY_CODE);
}
static inline bool cpu_physical_memory_range_includes_clean(struct uc_struct *uc, ram_addr_t start,
ram_addr_t length, uint8_t mask)
{
uint8_t ret = 0;
if (mask & (1 << DIRTY_MEMORY_CODE) &&
!cpu_physical_memory_all_dirty(uc, start, length, DIRTY_MEMORY_CODE)) {
ret |= (1 << DIRTY_MEMORY_CODE);
}
return ret;
}
static inline void cpu_physical_memory_set_dirty_flag(struct uc_struct *uc, ram_addr_t addr,
unsigned client)
{
assert(client < DIRTY_MEMORY_NUM);
set_bit_atomic(addr >> TARGET_PAGE_BITS, uc->ram_list.dirty_memory[client]);
}
static inline void cpu_physical_memory_set_dirty_range(struct uc_struct *uc, ram_addr_t start,
ram_addr_t length,
uint8_t mask)
{
unsigned long end, page;
unsigned long **d = uc->ram_list.dirty_memory;
end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
page = start >> TARGET_PAGE_BITS;
if (unlikely(mask & (1 << DIRTY_MEMORY_CODE))) {
bitmap_set_atomic(d[DIRTY_MEMORY_CODE], page, end - page);
}
}
#if !defined(_WIN32)
static inline void cpu_physical_memory_set_dirty_lebitmap(struct uc_struct *uc, unsigned long *bitmap,
ram_addr_t start,
ram_addr_t pages)
{
unsigned long i, j;
unsigned long page_number, c;
hwaddr addr;
ram_addr_t ram_addr;
unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
/* start address is aligned at the start of a word? */
if ((((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) &&
(hpratio == 1)) {
long k;
long nr = BITS_TO_LONGS(pages);
for (k = 0; k < nr; k++) {
if (bitmap[k]) {
unsigned long temp = leul_to_cpu(bitmap[k]);
unsigned long **d = uc->ram_list.dirty_memory;
if (tcg_enabled(uc)) {
atomic_or(&d[DIRTY_MEMORY_CODE][page + k], temp);
}
}
}
} else {
uint8_t clients = tcg_enabled(uc) ? DIRTY_CLIENTS_ALL : DIRTY_CLIENTS_NOCODE;
/*
* bitmap-traveling is faster than memory-traveling (for addr...)
* especially when most of the memory is not dirty.
*/
for (i = 0; i < len; i++) {
if (bitmap[i] != 0) {
c = leul_to_cpu(bitmap[i]);
do {
j = ctzl(c);
c &= ~(1ul << j);
page_number = (i * HOST_LONG_BITS + j) * hpratio;
addr = page_number * TARGET_PAGE_SIZE;
ram_addr = start + addr;
cpu_physical_memory_set_dirty_range(uc, ram_addr,
TARGET_PAGE_SIZE * hpratio, clients);
} while (c != 0);
}
}
}
}
#endif /* not _WIN32 */
bool cpu_physical_memory_test_and_clear_dirty(struct uc_struct *uc,
ram_addr_t start,
ram_addr_t length,
unsigned client);
static inline void cpu_physical_memory_clear_dirty_range(struct uc_struct *uc, ram_addr_t start,
ram_addr_t length,
unsigned client)
{
cpu_physical_memory_test_and_clear_dirty(uc, start, length, DIRTY_MEMORY_CODE);
}
#endif
#endif