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exec.c
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/*
* Virtual page mapping
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/types.h>
#include <sys/mman.h>
#endif
#include "qemu-common.h"
#include "cpu.h"
#include "tcg.h"
#include "hw/hw.h"
#include "hw/qdev.h"
#include "qemu/osdep.h"
#include "sysemu/kvm.h"
#include "sysemu/sysemu.h"
#include "hw/xen/xen.h"
#include "qemu/timer.h"
#include "qemu/config-file.h"
#include "exec/memory.h"
#include "sysemu/dma.h"
#include "exec/address-spaces.h"
#if defined(CONFIG_USER_ONLY)
#include <qemu.h>
#else /* !CONFIG_USER_ONLY */
#include "sysemu/xen-mapcache.h"
#include "trace.h"
#endif
#include "exec/cpu-all.h"
#include "exec/cputlb.h"
#include "translate-all.h"
#include "exec/memory-internal.h"
//#define DEBUG_SUBPAGE
#if !defined(CONFIG_USER_ONLY)
static int in_migration;
RAMList ram_list = { .blocks = QTAILQ_HEAD_INITIALIZER(ram_list.blocks) };
static MemoryRegion *system_memory;
static MemoryRegion *system_io;
AddressSpace address_space_io;
AddressSpace address_space_memory;
MemoryRegion io_mem_rom, io_mem_notdirty;
static MemoryRegion io_mem_unassigned;
#endif
struct CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
/* current CPU in the current thread. It is only valid inside
cpu_exec() */
DEFINE_TLS(CPUState *, current_cpu);
/* 0 = Do not count executed instructions.
1 = Precise instruction counting.
2 = Adaptive rate instruction counting. */
int use_icount;
#if !defined(CONFIG_USER_ONLY)
typedef struct PhysPageEntry PhysPageEntry;
struct PhysPageEntry {
/* How many bits skip to next level (in units of L2_SIZE). 0 for a leaf. */
uint16_t skip : 1;
/* index into phys_sections (!skip) or phys_map_nodes (skip) */
uint16_t ptr : 15;
};
/* Size of the L2 (and L3, etc) page tables. */
#define ADDR_SPACE_BITS TARGET_PHYS_ADDR_SPACE_BITS
#define P_L2_BITS 10
#define P_L2_SIZE (1 << P_L2_BITS)
#define P_L2_LEVELS (((ADDR_SPACE_BITS - TARGET_PAGE_BITS - 1) / P_L2_BITS) + 1)
typedef PhysPageEntry Node[P_L2_SIZE];
typedef struct PhysPageMap {
unsigned sections_nb;
unsigned sections_nb_alloc;
unsigned nodes_nb;
unsigned nodes_nb_alloc;
Node *nodes;
MemoryRegionSection *sections;
} PhysPageMap;
struct AddressSpaceDispatch {
/* This is a multi-level map on the physical address space.
* The bottom level has pointers to MemoryRegionSections.
*/
PhysPageEntry phys_map;
PhysPageMap map;
AddressSpace *as;
};
#define SUBPAGE_IDX(addr) ((addr) & ~TARGET_PAGE_MASK)
typedef struct subpage_t {
MemoryRegion iomem;
AddressSpace *as;
hwaddr base;
uint16_t sub_section[TARGET_PAGE_SIZE];
} subpage_t;
#define PHYS_SECTION_UNASSIGNED 0
#define PHYS_SECTION_NOTDIRTY 1
#define PHYS_SECTION_ROM 2
#define PHYS_SECTION_WATCH 3
#define PHYS_MAP_NODE_NIL (((uint16_t)~0) >> 1)
static void io_mem_init(void);
static void memory_map_init(void);
static MemoryRegion io_mem_watch;
#endif
#if !defined(CONFIG_USER_ONLY)
static void phys_map_node_reserve(PhysPageMap *map, unsigned nodes)
{
if (map->nodes_nb + nodes > map->nodes_nb_alloc) {
map->nodes_nb_alloc = MAX(map->nodes_nb_alloc * 2, 16);
map->nodes_nb_alloc = MAX(map->nodes_nb_alloc, map->nodes_nb + nodes);
map->nodes = g_renew(Node, map->nodes, map->nodes_nb_alloc);
}
}
static uint16_t phys_map_node_alloc(PhysPageMap *map)
{
unsigned i;
uint16_t ret;
ret = map->nodes_nb++;
assert(ret != PHYS_MAP_NODE_NIL);
assert(ret != map->nodes_nb_alloc);
for (i = 0; i < P_L2_SIZE; ++i) {
map->nodes[ret][i].skip = 1;
map->nodes[ret][i].ptr = PHYS_MAP_NODE_NIL;
}
return ret;
}
static void phys_page_set_level(PhysPageMap *map, PhysPageEntry *lp,
hwaddr *index, hwaddr *nb, uint16_t leaf,
int level)
{
PhysPageEntry *p;
int i;
hwaddr step = (hwaddr)1 << (level * P_L2_BITS);
if (lp->skip && lp->ptr == PHYS_MAP_NODE_NIL) {
lp->ptr = phys_map_node_alloc(map);
p = map->nodes[lp->ptr];
if (level == 0) {
for (i = 0; i < P_L2_SIZE; i++) {
p[i].skip = 0;
p[i].ptr = PHYS_SECTION_UNASSIGNED;
}
}
} else {
p = map->nodes[lp->ptr];
}
lp = &p[(*index >> (level * P_L2_BITS)) & (P_L2_SIZE - 1)];
while (*nb && lp < &p[P_L2_SIZE]) {
if ((*index & (step - 1)) == 0 && *nb >= step) {
lp->skip = 0;
lp->ptr = leaf;
*index += step;
*nb -= step;
} else {
phys_page_set_level(map, lp, index, nb, leaf, level - 1);
}
++lp;
}
}
static void phys_page_set(AddressSpaceDispatch *d,
hwaddr index, hwaddr nb,
uint16_t leaf)
{
/* Wildly overreserve - it doesn't matter much. */
phys_map_node_reserve(&d->map, 3 * P_L2_LEVELS);
phys_page_set_level(&d->map, &d->phys_map, &index, &nb, leaf, P_L2_LEVELS - 1);
}
static MemoryRegionSection *phys_page_find(PhysPageEntry lp, hwaddr addr,
Node *nodes, MemoryRegionSection *sections)
{
PhysPageEntry *p;
hwaddr index = addr >> TARGET_PAGE_BITS;
int i;
for (i = P_L2_LEVELS; lp.skip && (i -= lp.skip) >= 0;) {
if (lp.ptr == PHYS_MAP_NODE_NIL) {
return §ions[PHYS_SECTION_UNASSIGNED];
}
p = nodes[lp.ptr];
lp = p[(index >> (i * P_L2_BITS)) & (P_L2_SIZE - 1)];
}
return §ions[lp.ptr];
}
bool memory_region_is_unassigned(MemoryRegion *mr)
{
return mr != &io_mem_rom && mr != &io_mem_notdirty && !mr->rom_device
&& mr != &io_mem_watch;
}
static MemoryRegionSection *address_space_lookup_region(AddressSpaceDispatch *d,
hwaddr addr,
bool resolve_subpage)
{
MemoryRegionSection *section;
subpage_t *subpage;
section = phys_page_find(d->phys_map, addr, d->map.nodes, d->map.sections);
if (resolve_subpage && section->mr->subpage) {
subpage = container_of(section->mr, subpage_t, iomem);
section = &d->map.sections[subpage->sub_section[SUBPAGE_IDX(addr)]];
}
return section;
}
static MemoryRegionSection *
address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *xlat,
hwaddr *plen, bool resolve_subpage)
{
MemoryRegionSection *section;
Int128 diff;
section = address_space_lookup_region(d, addr, resolve_subpage);
/* Compute offset within MemoryRegionSection */
addr -= section->offset_within_address_space;
/* Compute offset within MemoryRegion */
*xlat = addr + section->offset_within_region;
diff = int128_sub(section->mr->size, int128_make64(addr));
*plen = int128_get64(int128_min(diff, int128_make64(*plen)));
return section;
}
static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
{
if (memory_region_is_ram(mr)) {
return !(is_write && mr->readonly);
}
if (memory_region_is_romd(mr)) {
return !is_write;
}
return false;
}
MemoryRegion *address_space_translate(AddressSpace *as, hwaddr addr,
hwaddr *xlat, hwaddr *plen,
bool is_write)
{
IOMMUTLBEntry iotlb;
MemoryRegionSection *section;
MemoryRegion *mr;
hwaddr len = *plen;
for (;;) {
section = address_space_translate_internal(as->dispatch, addr, &addr, plen, true);
mr = section->mr;
if (!mr->iommu_ops) {
break;
}
iotlb = mr->iommu_ops->translate(mr, addr);
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
len = MIN(len, (addr | iotlb.addr_mask) - addr + 1);
if (!(iotlb.perm & (1 << is_write))) {
mr = &io_mem_unassigned;
break;
}
as = iotlb.target_as;
}
if (memory_access_is_direct(mr, is_write)) {
hwaddr page = ((addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE) - addr;
len = MIN(page, len);
}
*plen = len;
*xlat = addr;
return mr;
}
MemoryRegionSection *
address_space_translate_for_iotlb(AddressSpace *as, hwaddr addr, hwaddr *xlat,
hwaddr *plen)
{
MemoryRegionSection *section;
section = address_space_translate_internal(as->dispatch, addr, xlat, plen, false);
assert(!section->mr->iommu_ops);
return section;
}
#endif
void cpu_exec_init_all(void)
{
#if !defined(CONFIG_USER_ONLY)
qemu_mutex_init(&ram_list.mutex);
memory_map_init();
io_mem_init();
#endif
}
#if !defined(CONFIG_USER_ONLY)
static int cpu_common_post_load(void *opaque, int version_id)
{
CPUState *cpu = opaque;
/* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
version_id is increased. */
cpu->interrupt_request &= ~0x01;
tlb_flush(cpu->env_ptr, 1);
return 0;
}
const VMStateDescription vmstate_cpu_common = {
.name = "cpu_common",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.post_load = cpu_common_post_load,
.fields = (VMStateField []) {
VMSTATE_UINT32(halted, CPUState),
VMSTATE_UINT32(interrupt_request, CPUState),
VMSTATE_END_OF_LIST()
}
};
#endif
CPUState *qemu_get_cpu(int index)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (cpu->cpu_index == index) {
return cpu;
}
}
return NULL;
}
void cpu_exec_init(CPUArchState *env)
{
CPUState *cpu = ENV_GET_CPU(env);
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUState *some_cpu;
int cpu_index;
#if defined(CONFIG_USER_ONLY)
cpu_list_lock();
#endif
cpu_index = 0;
CPU_FOREACH(some_cpu) {
cpu_index++;
}
cpu->cpu_index = cpu_index;
cpu->numa_node = 0;
QTAILQ_INIT(&env->breakpoints);
QTAILQ_INIT(&env->watchpoints);
#ifndef CONFIG_USER_ONLY
cpu->thread_id = qemu_get_thread_id();
#endif
QTAILQ_INSERT_TAIL(&cpus, cpu, node);
#if defined(CONFIG_USER_ONLY)
cpu_list_unlock();
#endif
if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
vmstate_register(NULL, cpu_index, &vmstate_cpu_common, cpu);
}
#if defined(CPU_SAVE_VERSION) && !defined(CONFIG_USER_ONLY)
register_savevm(NULL, "cpu", cpu_index, CPU_SAVE_VERSION,
cpu_save, cpu_load, env);
assert(cc->vmsd == NULL);
assert(qdev_get_vmsd(DEVICE(cpu)) == NULL);
#endif
if (cc->vmsd != NULL) {
vmstate_register(NULL, cpu_index, cc->vmsd, cpu);
}
}
#if defined(TARGET_HAS_ICE)
#if defined(CONFIG_USER_ONLY)
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
{
tb_invalidate_phys_page_range(pc, pc + 1, 0);
}
#else
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
{
hwaddr phys = cpu_get_phys_page_debug(cpu, pc);
if (phys != -1) {
tb_invalidate_phys_addr(phys | (pc & ~TARGET_PAGE_MASK));
}
}
#endif
#endif /* TARGET_HAS_ICE */
#if defined(CONFIG_USER_ONLY)
void cpu_watchpoint_remove_all(CPUArchState *env, int mask)
{
}
int cpu_watchpoint_insert(CPUArchState *env, target_ulong addr, target_ulong len,
int flags, CPUWatchpoint **watchpoint)
{
return -ENOSYS;
}
#else
/* Add a watchpoint. */
int cpu_watchpoint_insert(CPUArchState *env, target_ulong addr, target_ulong len,
int flags, CPUWatchpoint **watchpoint)
{
target_ulong len_mask = ~(len - 1);
CPUWatchpoint *wp;
/* sanity checks: allow power-of-2 lengths, deny unaligned watchpoints */
if ((len & (len - 1)) || (addr & ~len_mask) ||
len == 0 || len > TARGET_PAGE_SIZE) {
fprintf(stderr, "qemu: tried to set invalid watchpoint at "
TARGET_FMT_lx ", len=" TARGET_FMT_lu "\n", addr, len);
return -EINVAL;
}
wp = g_malloc(sizeof(*wp));
wp->vaddr = addr;
wp->len_mask = len_mask;
wp->flags = flags;
/* keep all GDB-injected watchpoints in front */
if (flags & BP_GDB)
QTAILQ_INSERT_HEAD(&env->watchpoints, wp, entry);
else
QTAILQ_INSERT_TAIL(&env->watchpoints, wp, entry);
tlb_flush_page(env, addr);
if (watchpoint)
*watchpoint = wp;
return 0;
}
/* Remove a specific watchpoint. */
int cpu_watchpoint_remove(CPUArchState *env, target_ulong addr, target_ulong len,
int flags)
{
target_ulong len_mask = ~(len - 1);
CPUWatchpoint *wp;
QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
if (addr == wp->vaddr && len_mask == wp->len_mask
&& flags == (wp->flags & ~BP_WATCHPOINT_HIT)) {
cpu_watchpoint_remove_by_ref(env, wp);
return 0;
}
}
return -ENOENT;
}
/* Remove a specific watchpoint by reference. */
void cpu_watchpoint_remove_by_ref(CPUArchState *env, CPUWatchpoint *watchpoint)
{
QTAILQ_REMOVE(&env->watchpoints, watchpoint, entry);
tlb_flush_page(env, watchpoint->vaddr);
g_free(watchpoint);
}
/* Remove all matching watchpoints. */
void cpu_watchpoint_remove_all(CPUArchState *env, int mask)
{
CPUWatchpoint *wp, *next;
QTAILQ_FOREACH_SAFE(wp, &env->watchpoints, entry, next) {
if (wp->flags & mask)
cpu_watchpoint_remove_by_ref(env, wp);
}
}
#endif
/* Add a breakpoint. */
int cpu_breakpoint_insert(CPUArchState *env, target_ulong pc, int flags,
CPUBreakpoint **breakpoint)
{
#if defined(TARGET_HAS_ICE)
CPUBreakpoint *bp;
bp = g_malloc(sizeof(*bp));
bp->pc = pc;
bp->flags = flags;
/* keep all GDB-injected breakpoints in front */
if (flags & BP_GDB) {
QTAILQ_INSERT_HEAD(&env->breakpoints, bp, entry);
} else {
QTAILQ_INSERT_TAIL(&env->breakpoints, bp, entry);
}
breakpoint_invalidate(ENV_GET_CPU(env), pc);
if (breakpoint) {
*breakpoint = bp;
}
return 0;
#else
return -ENOSYS;
#endif
}
/* Remove a specific breakpoint. */
int cpu_breakpoint_remove(CPUArchState *env, target_ulong pc, int flags)
{
#if defined(TARGET_HAS_ICE)
CPUBreakpoint *bp;
QTAILQ_FOREACH(bp, &env->breakpoints, entry) {
if (bp->pc == pc && bp->flags == flags) {
cpu_breakpoint_remove_by_ref(env, bp);
return 0;
}
}
return -ENOENT;
#else
return -ENOSYS;
#endif
}
/* Remove a specific breakpoint by reference. */
void cpu_breakpoint_remove_by_ref(CPUArchState *env, CPUBreakpoint *breakpoint)
{
#if defined(TARGET_HAS_ICE)
QTAILQ_REMOVE(&env->breakpoints, breakpoint, entry);
breakpoint_invalidate(ENV_GET_CPU(env), breakpoint->pc);
g_free(breakpoint);
#endif
}
/* Remove all matching breakpoints. */
void cpu_breakpoint_remove_all(CPUArchState *env, int mask)
{
#if defined(TARGET_HAS_ICE)
CPUBreakpoint *bp, *next;
QTAILQ_FOREACH_SAFE(bp, &env->breakpoints, entry, next) {
if (bp->flags & mask)
cpu_breakpoint_remove_by_ref(env, bp);
}
#endif
}
/* enable or disable single step mode. EXCP_DEBUG is returned by the
CPU loop after each instruction */
void cpu_single_step(CPUState *cpu, int enabled)
{
#if defined(TARGET_HAS_ICE)
if (cpu->singlestep_enabled != enabled) {
cpu->singlestep_enabled = enabled;
if (kvm_enabled()) {
kvm_update_guest_debug(cpu, 0);
} else {
/* must flush all the translated code to avoid inconsistencies */
/* XXX: only flush what is necessary */
CPUArchState *env = cpu->env_ptr;
tb_flush(env);
}
}
#endif
}
void cpu_abort(CPUArchState *env, const char *fmt, ...)
{
CPUState *cpu = ENV_GET_CPU(env);
va_list ap;
va_list ap2;
va_start(ap, fmt);
va_copy(ap2, ap);
fprintf(stderr, "qemu: fatal: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_FPU | CPU_DUMP_CCOP);
if (qemu_log_enabled()) {
qemu_log("qemu: fatal: ");
qemu_log_vprintf(fmt, ap2);
qemu_log("\n");
log_cpu_state(cpu, CPU_DUMP_FPU | CPU_DUMP_CCOP);
qemu_log_flush();
qemu_log_close();
}
va_end(ap2);
va_end(ap);
#if defined(CONFIG_USER_ONLY)
{
struct sigaction act;
sigfillset(&act.sa_mask);
act.sa_handler = SIG_DFL;
sigaction(SIGABRT, &act, NULL);
}
#endif
abort();
}
#if !defined(CONFIG_USER_ONLY)
static RAMBlock *qemu_get_ram_block(ram_addr_t addr)
{
RAMBlock *block;
/* The list is protected by the iothread lock here. */
block = ram_list.mru_block;
if (block && addr - block->offset < block->length) {
goto found;
}
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
if (addr - block->offset < block->length) {
goto found;
}
}
fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr);
abort();
found:
ram_list.mru_block = block;
return block;
}
static void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t end,
uintptr_t length)
{
RAMBlock *block;
ram_addr_t start1;
block = qemu_get_ram_block(start);
assert(block == qemu_get_ram_block(end - 1));
start1 = (uintptr_t)block->host + (start - block->offset);
cpu_tlb_reset_dirty_all(start1, length);
}
/* Note: start and end must be within the same ram block. */
void cpu_physical_memory_reset_dirty(ram_addr_t start, ram_addr_t end,
int dirty_flags)
{
uintptr_t length;
start &= TARGET_PAGE_MASK;
end = TARGET_PAGE_ALIGN(end);
length = end - start;
if (length == 0)
return;
cpu_physical_memory_mask_dirty_range(start, length, dirty_flags);
if (tcg_enabled()) {
tlb_reset_dirty_range_all(start, end, length);
}
}
static int cpu_physical_memory_set_dirty_tracking(int enable)
{
int ret = 0;
in_migration = enable;
return ret;
}
hwaddr memory_region_section_get_iotlb(CPUArchState *env,
MemoryRegionSection *section,
target_ulong vaddr,
hwaddr paddr, hwaddr xlat,
int prot,
target_ulong *address)
{
hwaddr iotlb;
CPUWatchpoint *wp;
if (memory_region_is_ram(section->mr)) {
/* Normal RAM. */
iotlb = (memory_region_get_ram_addr(section->mr) & TARGET_PAGE_MASK)
+ xlat;
if (!section->readonly) {
iotlb |= PHYS_SECTION_NOTDIRTY;
} else {
iotlb |= PHYS_SECTION_ROM;
}
} else {
iotlb = section - address_space_memory.dispatch->map.sections;
iotlb += xlat;
}
/* Make accesses to pages with watchpoints go via the
watchpoint trap routines. */
QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
if (vaddr == (wp->vaddr & TARGET_PAGE_MASK)) {
/* Avoid trapping reads of pages with a write breakpoint. */
if ((prot & PAGE_WRITE) || (wp->flags & BP_MEM_READ)) {
iotlb = PHYS_SECTION_WATCH + paddr;
*address |= TLB_MMIO;
break;
}
}
}
return iotlb;
}
#endif /* defined(CONFIG_USER_ONLY) */
#if !defined(CONFIG_USER_ONLY)
static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
uint16_t section);
static subpage_t *subpage_init(AddressSpace *as, hwaddr base);
static void *(*phys_mem_alloc)(size_t size) = qemu_anon_ram_alloc;
/*
* Set a custom physical guest memory alloator.
* Accelerators with unusual needs may need this. Hopefully, we can
* get rid of it eventually.
*/
void phys_mem_set_alloc(void *(*alloc)(size_t))
{
phys_mem_alloc = alloc;
}
static uint16_t phys_section_add(PhysPageMap *map,
MemoryRegionSection *section)
{
/* The physical section number is ORed with a page-aligned
* pointer to produce the iotlb entries. Thus it should
* never overflow into the page-aligned value.
*/
assert(map->sections_nb < TARGET_PAGE_SIZE);
if (map->sections_nb == map->sections_nb_alloc) {
map->sections_nb_alloc = MAX(map->sections_nb_alloc * 2, 16);
map->sections = g_renew(MemoryRegionSection, map->sections,
map->sections_nb_alloc);
}
map->sections[map->sections_nb] = *section;
memory_region_ref(section->mr);
return map->sections_nb++;
}
static void phys_section_destroy(MemoryRegion *mr)
{
memory_region_unref(mr);
if (mr->subpage) {
subpage_t *subpage = container_of(mr, subpage_t, iomem);
memory_region_destroy(&subpage->iomem);
g_free(subpage);
}
}
static void phys_sections_free(PhysPageMap *map)
{
while (map->sections_nb > 0) {
MemoryRegionSection *section = &map->sections[--map->sections_nb];
phys_section_destroy(section->mr);
}
g_free(map->sections);
g_free(map->nodes);
}
static void register_subpage(AddressSpaceDispatch *d, MemoryRegionSection *section)
{
subpage_t *subpage;
hwaddr base = section->offset_within_address_space
& TARGET_PAGE_MASK;
MemoryRegionSection *existing = phys_page_find(d->phys_map, base,
d->map.nodes, d->map.sections);
MemoryRegionSection subsection = {
.offset_within_address_space = base,
.size = int128_make64(TARGET_PAGE_SIZE),
};
hwaddr start, end;
assert(existing->mr->subpage || existing->mr == &io_mem_unassigned);
if (!(existing->mr->subpage)) {
subpage = subpage_init(d->as, base);
subsection.mr = &subpage->iomem;
phys_page_set(d, base >> TARGET_PAGE_BITS, 1,
phys_section_add(&d->map, &subsection));
} else {
subpage = container_of(existing->mr, subpage_t, iomem);
}
start = section->offset_within_address_space & ~TARGET_PAGE_MASK;
end = start + int128_get64(section->size) - 1;
subpage_register(subpage, start, end,
phys_section_add(&d->map, section));
}
static void register_multipage(AddressSpaceDispatch *d,
MemoryRegionSection *section)
{
hwaddr start_addr = section->offset_within_address_space;
uint16_t section_index = phys_section_add(&d->map, section);
uint64_t num_pages = int128_get64(int128_rshift(section->size,
TARGET_PAGE_BITS));
assert(num_pages);
phys_page_set(d, start_addr >> TARGET_PAGE_BITS, num_pages, section_index);
}
static void mem_add(MemoryListener *listener, MemoryRegionSection *section)
{
AddressSpace *as = container_of(listener, AddressSpace, dispatch_listener);
AddressSpaceDispatch *d = as->next_dispatch;
MemoryRegionSection now = *section, remain = *section;
Int128 page_size = int128_make64(TARGET_PAGE_SIZE);
if (now.offset_within_address_space & ~TARGET_PAGE_MASK) {
uint64_t left = TARGET_PAGE_ALIGN(now.offset_within_address_space)
- now.offset_within_address_space;
now.size = int128_min(int128_make64(left), now.size);
register_subpage(d, &now);
} else {
now.size = int128_zero();
}
while (int128_ne(remain.size, now.size)) {
remain.size = int128_sub(remain.size, now.size);
remain.offset_within_address_space += int128_get64(now.size);
remain.offset_within_region += int128_get64(now.size);
now = remain;
if (int128_lt(remain.size, page_size)) {
register_subpage(d, &now);
} else if (remain.offset_within_address_space & ~TARGET_PAGE_MASK) {
now.size = page_size;
register_subpage(d, &now);
} else {
now.size = int128_and(now.size, int128_neg(page_size));
register_multipage(d, &now);
}
}
}
void qemu_flush_coalesced_mmio_buffer(void)
{
if (kvm_enabled())
kvm_flush_coalesced_mmio_buffer();
}
void qemu_mutex_lock_ramlist(void)
{
qemu_mutex_lock(&ram_list.mutex);
}
void qemu_mutex_unlock_ramlist(void)
{
qemu_mutex_unlock(&ram_list.mutex);
}
#ifdef __linux__
#include <sys/vfs.h>
#define HUGETLBFS_MAGIC 0x958458f6
static long gethugepagesize(const char *path)
{
struct statfs fs;
int ret;
do {
ret = statfs(path, &fs);
} while (ret != 0 && errno == EINTR);
if (ret != 0) {
perror(path);
return 0;
}
if (fs.f_type != HUGETLBFS_MAGIC)
fprintf(stderr, "Warning: path not on HugeTLBFS: %s\n", path);
return fs.f_bsize;
}
static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
const char *path)
{
char *filename;
char *sanitized_name;
char *c;
void *area;
int fd;
#ifdef MAP_POPULATE
int flags;
#endif
unsigned long hpagesize;
hpagesize = gethugepagesize(path);
if (!hpagesize) {
return NULL;
}
if (memory < hpagesize) {
return NULL;
}
if (kvm_enabled() && !kvm_has_sync_mmu()) {
fprintf(stderr, "host lacks kvm mmu notifiers, -mem-path unsupported\n");
return NULL;
}
/* Make name safe to use with mkstemp by replacing '/' with '_'. */
sanitized_name = g_strdup(block->mr->name);
for (c = sanitized_name; *c != '\0'; c++) {
if (*c == '/')
*c = '_';
}
filename = g_strdup_printf("%s/qemu_back_mem.%s.XXXXXX", path,
sanitized_name);
g_free(sanitized_name);
fd = mkstemp(filename);
if (fd < 0) {
perror("unable to create backing store for hugepages");
g_free(filename);
return NULL;
}
unlink(filename);
g_free(filename);
memory = (memory+hpagesize-1) & ~(hpagesize-1);
/*
* ftruncate is not supported by hugetlbfs in older
* hosts, so don't bother bailing out on errors.
* If anything goes wrong with it under other filesystems,
* mmap will fail.
*/
if (ftruncate(fd, memory))
perror("ftruncate");
#ifdef MAP_POPULATE
/* NB: MAP_POPULATE won't exhaustively alloc all phys pages in the case
* MAP_PRIVATE is requested. For mem_prealloc we mmap as MAP_SHARED
* to sidestep this quirk.
*/
flags = mem_prealloc ? MAP_POPULATE | MAP_SHARED : MAP_PRIVATE;
area = mmap(0, memory, PROT_READ | PROT_WRITE, flags, fd, 0);
#else
area = mmap(0, memory, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
#endif
if (area == MAP_FAILED) {
perror("file_ram_alloc: can't mmap RAM pages");
close(fd);
return (NULL);
}
block->fd = fd;