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exec.c
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exec.c
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/*
* virtual page mapping and translated block handling
*
* 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
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <sys/types.h>
#include <sys/mman.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <inttypes.h>
#include "cpu.h"
#include "exec/exec-all.h"
#include "qemu-common.h"
#include "tcg.h"
#include "hw/hw.h"
#include "hw/qdev.h"
#include "hw/xen/xen.h"
#include "qemu/bitmap.h"
#include "qemu/osdep.h"
#include "qemu/tls.h"
#include "sysemu/kvm.h"
#include "exec/cputlb.h"
#include "exec/hax.h"
#include "exec/ram_addr.h"
#include "qemu/timer.h"
#if defined(CONFIG_USER_ONLY)
#include <qemu.h>
#endif
#include "translate-all.h"
//#define DEBUG_SUBPAGE
#if !defined(CONFIG_USER_ONLY)
int phys_ram_fd;
static int in_migration;
RAMList ram_list = { .blocks = QTAILQ_HEAD_INITIALIZER(ram_list.blocks) };
#endif
struct CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
DEFINE_TLS(CPUState *, current_cpu);
/* 0 = Do not count executed instructions.
1 = Precise instruction counting.
2 = Adaptive rate instruction counting. */
int use_icount = 0;
/* Current instruction counter. While executing translated code this may
include some instructions that have not yet been executed. */
int64_t qemu_icount;
#if !defined(CONFIG_USER_ONLY)
static void io_mem_init(void);
/* io memory support */
CPUWriteMemoryFunc *_io_mem_write[IO_MEM_NB_ENTRIES][4];
CPUReadMemoryFunc *_io_mem_read[IO_MEM_NB_ENTRIES][4];
void *io_mem_opaque[IO_MEM_NB_ENTRIES];
static char io_mem_used[IO_MEM_NB_ENTRIES];
int io_mem_watch;
#endif
/* log support */
#ifdef WIN32
static const char *logfilename = "qemu.log";
#else
static const char *logfilename = "/tmp/qemu.log";
#endif
FILE *logfile;
int loglevel;
static int log_append = 0;
#define SUBPAGE_IDX(addr) ((addr) & ~TARGET_PAGE_MASK)
typedef struct subpage_t {
hwaddr base;
CPUReadMemoryFunc **mem_read[TARGET_PAGE_SIZE][4];
CPUWriteMemoryFunc **mem_write[TARGET_PAGE_SIZE][4];
void *opaque[TARGET_PAGE_SIZE][2][4];
ram_addr_t region_offset[TARGET_PAGE_SIZE][2][4];
} subpage_t;
/* Must be called before using the QEMU cpus. 'tb_size' is the size
(in bytes) allocated to the translation buffer. Zero means default
size. */
void cpu_exec_init_all(unsigned long tb_size)
{
//cpu_gen_init();
//code_gen_alloc(tb_size);
//code_gen_ptr = code_gen_buffer;
//page_init();
tcg_exec_init(tb_size);
#if !defined(CONFIG_USER_ONLY)
qemu_mutex_init(&ram_list.mutex);
io_mem_init();
#endif
}
#if defined(CPU_SAVE_VERSION) && !defined(CONFIG_USER_ONLY)
#define CPU_COMMON_SAVE_VERSION 1
static void cpu_common_save(QEMUFile *f, void *opaque)
{
CPUOldState *env = opaque;
CPUState *cpu = ENV_GET_CPU(env);
cpu_synchronize_state(cpu, 0);
qemu_put_be32s(f, &cpu->halted);
qemu_put_be32s(f, &cpu->interrupt_request);
}
static int cpu_common_load(QEMUFile *f, void *opaque, int version_id)
{
CPUOldState *env = opaque;
CPUState *cpu = ENV_GET_CPU(env);
if (version_id != CPU_COMMON_SAVE_VERSION)
return -EINVAL;
qemu_get_be32s(f, &cpu->halted);
qemu_get_be32s(f, &cpu->interrupt_request);
/* 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
version_id is increased. */
cpu->interrupt_request &= ~0x01;
tlb_flush(env, 1);
cpu_synchronize_state(cpu, 1);
return 0;
}
#endif
CPUState *qemu_get_cpu(int cpu_index)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (cpu->cpu_index == cpu_index)
return cpu;
}
return NULL;
}
void cpu_exec_init(CPUArchState *env)
{
CPUState *cpu = ENV_GET_CPU(env);
#if defined(CONFIG_USER_ONLY)
cpu_list_lock();
#endif
// Compute CPU index from list position.
int cpu_index = 0;
CPUState *cpu1;
CPU_FOREACH(cpu1) {
cpu_index++;
}
cpu->cpu_index = cpu_index;
QTAILQ_INSERT_TAIL(&cpus, cpu, node);
cpu->numa_node = 0;
QTAILQ_INIT(&env->breakpoints);
QTAILQ_INIT(&env->watchpoints);
#if defined(CONFIG_USER_ONLY)
cpu_list_unlock();
#endif
#if defined(CPU_SAVE_VERSION) && !defined(CONFIG_USER_ONLY)
register_savevm(NULL,
"cpu_common",
cpu_index,
CPU_COMMON_SAVE_VERSION,
cpu_common_save,
cpu_common_load,
env);
register_savevm(NULL,
"cpu",
cpu_index,
CPU_SAVE_VERSION,
cpu_save,
cpu_load,
env);
#endif
}
#if defined(TARGET_HAS_ICE)
static void breakpoint_invalidate(CPUArchState *env, target_ulong pc)
{
hwaddr addr;
target_ulong pd;
ram_addr_t ram_addr;
PhysPageDesc *p;
addr = cpu_get_phys_page_debug(env, pc);
p = phys_page_find(addr >> TARGET_PAGE_BITS);
if (!p) {
pd = IO_MEM_UNASSIGNED;
} else {
pd = p->phys_offset;
}
ram_addr = (pd & TARGET_PAGE_MASK) | (pc & ~TARGET_PAGE_MASK);
tb_invalidate_phys_page_range(ram_addr, ram_addr + 1, 0);
}
#endif
#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, 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, 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->env_ptr, 0);
} else {
/* must flush all the translated code to avoid inconsistencies */
/* XXX: only flush what is necessary */
tb_flush(cpu->env_ptr);
}
}
#endif
}
/* enable or disable low levels log */
void cpu_set_log(int log_flags)
{
loglevel = log_flags;
if (loglevel && !logfile) {
logfile = fopen(logfilename, log_append ? "a" : "w");
if (!logfile) {
perror(logfilename);
exit(1);
}
#if !defined(CONFIG_SOFTMMU)
/* must avoid mmap() usage of glibc by setting a buffer "by hand" */
{
static char logfile_buf[4096];
setvbuf(logfile, logfile_buf, _IOLBF, sizeof(logfile_buf));
}
#elif !defined(_WIN32)
/* Win32 doesn't support line-buffering and requires size >= 2 */
setvbuf(logfile, NULL, _IOLBF, 0);
#endif
log_append = 1;
}
if (!loglevel && logfile) {
fclose(logfile);
logfile = NULL;
}
}
void cpu_set_log_filename(const char *filename)
{
logfilename = strdup(filename);
if (logfile) {
fclose(logfile);
logfile = NULL;
}
cpu_set_log(loglevel);
}
void cpu_reset_interrupt(CPUState *cpu, int mask)
{
cpu->interrupt_request &= ~mask;
}
void cpu_exit(CPUState *cpu)
{
cpu->exit_request = 1;
cpu->tcg_exit_req = 1;
}
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");
#ifdef TARGET_I386
cpu_dump_state(cpu, stderr, fprintf, X86_DUMP_FPU | X86_DUMP_CCOP);
#else
cpu_dump_state(cpu, stderr, fprintf, 0);
#endif
if (qemu_log_enabled()) {
qemu_log("qemu: fatal: ");
qemu_log_vprintf(fmt, ap2);
qemu_log("\n");
#ifdef TARGET_I386
log_cpu_state(cpu, X86_DUMP_FPU | X86_DUMP_CCOP);
#else
log_cpu_state(cpu, 0);
#endif
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 length)
{
ram_addr_t end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
RAMBlock* block = qemu_get_ram_block(start);
assert(block == qemu_get_ram_block(end - 1));
uintptr_t 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 length,
unsigned client)
{
if (length == 0)
return;
cpu_physical_memory_clear_dirty_range(start, length, client);
if (tcg_enabled()) {
tlb_reset_dirty_range_all(start, length);
}
}
int cpu_physical_memory_set_dirty_tracking(int enable)
{
in_migration = enable;
if (kvm_enabled()) {
return kvm_set_migration_log(enable);
}
return 0;
}
int cpu_physical_memory_get_dirty_tracking(void)
{
return in_migration;
}
int cpu_physical_sync_dirty_bitmap(hwaddr start_addr,
hwaddr end_addr)
{
int ret = 0;
if (kvm_enabled())
ret = kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
return ret;
}
static inline void tlb_update_dirty(CPUTLBEntry *tlb_entry)
{
ram_addr_t ram_addr;
void *p;
if ((tlb_entry->addr_write & ~TARGET_PAGE_MASK) == IO_MEM_RAM) {
p = (void *)(uintptr_t)((tlb_entry->addr_write & TARGET_PAGE_MASK)
+ tlb_entry->addend);
ram_addr = qemu_ram_addr_from_host_nofail(p);
if (cpu_physical_memory_is_clean(ram_addr)) {
tlb_entry->addr_write |= TLB_NOTDIRTY;
}
}
}
/* update the TLB according to the current state of the dirty bits */
void cpu_tlb_update_dirty(CPUArchState *env)
{
int i;
int mmu_idx;
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
for(i = 0; i < CPU_TLB_SIZE; i++)
tlb_update_dirty(&env->tlb_table[mmu_idx][i]);
}
}
#else
void tlb_flush(CPUArchState *env, int flush_global)
{
}
void tlb_flush_page(CPUArchState *env, target_ulong addr)
{
}
int tlb_set_page_exec(CPUArchState *env, target_ulong vaddr,
hwaddr paddr, int prot,
int mmu_idx, int is_softmmu)
{
return 0;
}
static inline void tlb_set_dirty(CPUOldState *env,
unsigned long addr, target_ulong vaddr)
{
}
#endif /* defined(CONFIG_USER_ONLY) */
#if !defined(CONFIG_USER_ONLY)
static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
ram_addr_t memory, ram_addr_t region_offset);
static void *subpage_init (hwaddr base, ram_addr_t *phys,
ram_addr_t orig_memory, ram_addr_t region_offset);
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;
}
#define CHECK_SUBPAGE(addr, start_addr, start_addr2, end_addr, end_addr2, \
need_subpage) \
do { \
if (addr > start_addr) \
start_addr2 = 0; \
else { \
start_addr2 = start_addr & ~TARGET_PAGE_MASK; \
if (start_addr2 > 0) \
need_subpage = 1; \
} \
\
if ((start_addr + orig_size) - addr >= TARGET_PAGE_SIZE) \
end_addr2 = TARGET_PAGE_SIZE - 1; \
else { \
end_addr2 = (start_addr + orig_size - 1) & ~TARGET_PAGE_MASK; \
if (end_addr2 < TARGET_PAGE_SIZE - 1) \
need_subpage = 1; \
} \
} while (0)
/* register physical memory.
For RAM, 'size' must be a multiple of the target page size.
If (phys_offset & ~TARGET_PAGE_MASK) != 0, then it is an
io memory page. The address used when calling the IO function is
the offset from the start of the region, plus region_offset. Both
start_addr and region_offset are rounded down to a page boundary
before calculating this offset. This should not be a problem unless
the low bits of start_addr and region_offset differ. */
void cpu_register_physical_memory_log(hwaddr start_addr,
ram_addr_t size,
ram_addr_t phys_offset,
ram_addr_t region_offset,
bool log_dirty)
{
hwaddr addr, end_addr;
PhysPageDesc *p;
CPUState *cpu;
ram_addr_t orig_size = size;
subpage_t *subpage;
if (kvm_enabled())
kvm_set_phys_mem(start_addr, size, phys_offset);
#ifdef CONFIG_HAX
if (hax_enabled())
hax_set_phys_mem(start_addr, size, phys_offset);
#endif
if (phys_offset == IO_MEM_UNASSIGNED) {
region_offset = start_addr;
}
region_offset &= TARGET_PAGE_MASK;
size = (size + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK;
end_addr = start_addr + (hwaddr)size;
addr = start_addr;
do {
p = phys_page_find(addr >> TARGET_PAGE_BITS);
if (p && p->phys_offset != IO_MEM_UNASSIGNED) {
ram_addr_t orig_memory = p->phys_offset;
hwaddr start_addr2, end_addr2;
int need_subpage = 0;
CHECK_SUBPAGE(addr, start_addr, start_addr2, end_addr, end_addr2,
need_subpage);
if (need_subpage) {
if (!(orig_memory & IO_MEM_SUBPAGE)) {
subpage = subpage_init((addr & TARGET_PAGE_MASK),
&p->phys_offset, orig_memory,
p->region_offset);
} else {
subpage = io_mem_opaque[(orig_memory & ~TARGET_PAGE_MASK)
>> IO_MEM_SHIFT];
}
subpage_register(subpage, start_addr2, end_addr2, phys_offset,
region_offset);
p->region_offset = 0;
} else {
p->phys_offset = phys_offset;
if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM ||
(phys_offset & IO_MEM_ROMD))
phys_offset += TARGET_PAGE_SIZE;
}
} else {
p = phys_page_find_alloc(addr >> TARGET_PAGE_BITS, 1);
p->phys_offset = phys_offset;
p->region_offset = region_offset;
if ((phys_offset & ~TARGET_PAGE_MASK) <= IO_MEM_ROM ||
(phys_offset & IO_MEM_ROMD)) {
phys_offset += TARGET_PAGE_SIZE;
} else {
hwaddr start_addr2, end_addr2;
int need_subpage = 0;
CHECK_SUBPAGE(addr, start_addr, start_addr2, end_addr,
end_addr2, need_subpage);
if (need_subpage) {
subpage = subpage_init((addr & TARGET_PAGE_MASK),
&p->phys_offset, IO_MEM_UNASSIGNED,
addr & TARGET_PAGE_MASK);
subpage_register(subpage, start_addr2, end_addr2,
phys_offset, region_offset);
p->region_offset = 0;
}
}
}
region_offset += TARGET_PAGE_SIZE;
addr += TARGET_PAGE_SIZE;
} while (addr != end_addr);
/* since each CPU stores ram addresses in its TLB cache, we must
reset the modified entries */
/* XXX: slow ! */
CPU_FOREACH(cpu) {
tlb_flush(cpu->env_ptr, 1);
}
}
/* XXX: temporary until new memory mapping API */
ram_addr_t cpu_get_physical_page_desc(hwaddr addr)
{
PhysPageDesc *p;
p = phys_page_find(addr >> TARGET_PAGE_BITS);
if (!p)
return IO_MEM_UNASSIGNED;
return p->phys_offset;
}
void qemu_register_coalesced_mmio(hwaddr addr, ram_addr_t size)
{
if (kvm_enabled())
kvm_coalesce_mmio_region(addr, size);
}
void qemu_unregister_coalesced_mmio(hwaddr addr, ram_addr_t size)
{
if (kvm_enabled())
kvm_uncoalesce_mmio_region(addr, size);
}
void qemu_mutex_lock_ramlist(void)
{
qemu_mutex_lock(&ram_list.mutex);
}
void qemu_mutex_unlock_ramlist(void)
{
qemu_mutex_unlock(&ram_list.mutex);
}
#if defined(__linux__) && !defined(CONFIG_ANDROID)
#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 sigjmp_buf sigjump;
static void sigbus_handler(int signal)
{
siglongjmp(sigjump, 1);
}
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;
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");
area = mmap(0, memory, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
if (area == MAP_FAILED) {
perror("file_ram_alloc: can't mmap RAM pages");
close(fd);
return (NULL);
}
if (mem_prealloc) {
int ret, i;
struct sigaction act, oldact;
sigset_t set, oldset;
memset(&act, 0, sizeof(act));
act.sa_handler = &sigbus_handler;
act.sa_flags = 0;
ret = sigaction(SIGBUS, &act, &oldact);
if (ret) {
perror("file_ram_alloc: failed to install signal handler");
exit(1);
}
/* unblock SIGBUS */
sigemptyset(&set);
sigaddset(&set, SIGBUS);
pthread_sigmask(SIG_UNBLOCK, &set, &oldset);
if (sigsetjmp(sigjump, 1)) {
fprintf(stderr, "file_ram_alloc: failed to preallocate pages\n");
exit(1);
}
/* MAP_POPULATE silently ignores failures */
for (i = 0; i < (memory/hpagesize)-1; i++) {
memset(area + (hpagesize*i), 0, 1);
}
ret = sigaction(SIGBUS, &oldact, NULL);
if (ret) {
perror("file_ram_alloc: failed to reinstall signal handler");
exit(1);
}
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
}
block->fd = fd;
return area;
}
#else
static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
const char *path)
{
fprintf(stderr, "-mem-path not supported on this host\n");
exit(1);
}
#endif
static ram_addr_t find_ram_offset(ram_addr_t size)
{
RAMBlock *block, *next_block;
ram_addr_t offset = RAM_ADDR_MAX, mingap = RAM_ADDR_MAX;
assert(size != 0); /* it would hand out same offset multiple times */
if (QTAILQ_EMPTY(&ram_list.blocks))
return 0;
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
ram_addr_t end, next = RAM_ADDR_MAX;
end = block->offset + block->length;
QTAILQ_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;
}
}
if (offset == RAM_ADDR_MAX) {
fprintf(stderr, "Failed to find gap of requested size: %" PRIu64 "\n",
(uint64_t)size);
abort();
}
return offset;
}
ram_addr_t last_ram_offset(void)
{
RAMBlock *block;
ram_addr_t last = 0;
QTAILQ_FOREACH(block, &ram_list.blocks, next)
last = MAX(last, block->offset + block->length);
return last;
}
static void qemu_ram_setup_dump(void *addr, ram_addr_t size)
{
#ifndef CONFIG_ANDROID
int ret;
/* Use MADV_DONTDUMP, if user doesn't want the guest memory in the core */
if (!qemu_opt_get_bool(qemu_get_machine_opts(),
"dump-guest-core", true)) {
ret = qemu_madvise(addr, size, QEMU_MADV_DONTDUMP);
if (ret) {
perror("qemu_madvise");
fprintf(stderr, "madvise doesn't support MADV_DONTDUMP, "
"but dump_guest_core=off specified\n");
}
}
#endif // !CONFIG_ANDROID
}
void qemu_ram_set_idstr(ram_addr_t addr, const char *name, DeviceState *dev)
{
RAMBlock *new_block, *block;