/* RAM is mmap-ed with MAP_SHARED */
#define RAM_SHARED (1 << 1)
+/* Only a portion of RAM (used_length) is actually used, and migrated.
+ * This used_length size can change across reboots.
+ */
+#define RAM_RESIZEABLE (1 << 2)
+
#endif
struct CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
{
CPUState *cpu = opaque;
- cpu->exception_index = 0;
+ cpu->exception_index = -1;
return 0;
}
{
CPUState *cpu = opaque;
- return cpu->exception_index != 0;
+ return tcg_enabled() && cpu->exception_index != -1;
}
static const VMStateDescription vmstate_cpu_common_exception_index = {
}
}
-#if defined(TARGET_HAS_ICE)
#if defined(CONFIG_USER_ONLY)
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
{
}
}
#endif
-#endif /* TARGET_HAS_ICE */
#if defined(CONFIG_USER_ONLY)
void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
CPUBreakpoint **breakpoint)
{
-#if defined(TARGET_HAS_ICE)
CPUBreakpoint *bp;
bp = g_malloc(sizeof(*bp));
*breakpoint = bp;
}
return 0;
-#else
- return -ENOSYS;
-#endif
}
/* Remove a specific breakpoint. */
int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
{
-#if defined(TARGET_HAS_ICE)
CPUBreakpoint *bp;
QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
}
}
return -ENOENT;
-#else
- return -ENOSYS;
-#endif
}
/* Remove a specific breakpoint by reference. */
void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *breakpoint)
{
-#if defined(TARGET_HAS_ICE)
QTAILQ_REMOVE(&cpu->breakpoints, breakpoint, entry);
breakpoint_invalidate(cpu, breakpoint->pc);
g_free(breakpoint);
-#endif
}
/* Remove all matching breakpoints. */
void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
{
-#if defined(TARGET_HAS_ICE)
CPUBreakpoint *bp, *next;
QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
cpu_breakpoint_remove_by_ref(cpu, 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()) {
tb_flush(env);
}
}
-#endif
}
void cpu_abort(CPUState *cpu, const char *fmt, ...)
/* The list is protected by the iothread lock here. */
block = ram_list.mru_block;
- if (block && addr - block->offset < block->length) {
+ if (block && addr - block->offset < block->max_length) {
goto found;
}
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
- if (addr - block->offset < block->length) {
+ if (addr - block->offset < block->max_length) {
goto found;
}
}
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
ram_addr_t end, next = RAM_ADDR_MAX;
- end = block->offset + block->length;
+ end = block->offset + block->max_length;
QTAILQ_FOREACH(next_block, &ram_list.blocks, next) {
if (next_block->offset >= end) {
ram_addr_t last = 0;
QTAILQ_FOREACH(block, &ram_list.blocks, next)
- last = MAX(last, block->offset + block->length);
+ last = MAX(last, block->offset + block->max_length);
return last;
}
return qemu_madvise(addr, len, QEMU_MADV_MERGEABLE);
}
+/* Only legal before guest might have detected the memory size: e.g. on
+ * incoming migration, or right after reset.
+ *
+ * As memory core doesn't know how is memory accessed, it is up to
+ * resize callback to update device state and/or add assertions to detect
+ * misuse, if necessary.
+ */
+int qemu_ram_resize(ram_addr_t base, ram_addr_t newsize, Error **errp)
+{
+ RAMBlock *block = find_ram_block(base);
+
+ assert(block);
+
+ if (block->used_length == newsize) {
+ return 0;
+ }
+
+ if (!(block->flags & RAM_RESIZEABLE)) {
+ error_setg_errno(errp, EINVAL,
+ "Length mismatch: %s: 0x" RAM_ADDR_FMT
+ " in != 0x" RAM_ADDR_FMT, block->idstr,
+ newsize, block->used_length);
+ return -EINVAL;
+ }
+
+ if (block->max_length < newsize) {
+ error_setg_errno(errp, EINVAL,
+ "Length too large: %s: 0x" RAM_ADDR_FMT
+ " > 0x" RAM_ADDR_FMT, block->idstr,
+ newsize, block->max_length);
+ return -EINVAL;
+ }
+
+ cpu_physical_memory_clear_dirty_range(block->offset, block->used_length);
+ block->used_length = newsize;
+ cpu_physical_memory_set_dirty_range(block->offset, block->used_length);
+ memory_region_set_size(block->mr, newsize);
+ if (block->resized) {
+ block->resized(block->idstr, newsize, block->host);
+ }
+ return 0;
+}
+
static ram_addr_t ram_block_add(RAMBlock *new_block, Error **errp)
{
RAMBlock *block;
/* This assumes the iothread lock is taken here too. */
qemu_mutex_lock_ramlist();
- new_block->offset = find_ram_offset(new_block->length);
+ new_block->offset = find_ram_offset(new_block->max_length);
if (!new_block->host) {
if (xen_enabled()) {
- xen_ram_alloc(new_block->offset, new_block->length, new_block->mr);
+ xen_ram_alloc(new_block->offset, new_block->max_length,
+ new_block->mr);
} else {
- new_block->host = phys_mem_alloc(new_block->length,
+ new_block->host = phys_mem_alloc(new_block->max_length,
&new_block->mr->align);
if (!new_block->host) {
error_setg_errno(errp, errno,
qemu_mutex_unlock_ramlist();
return -1;
}
- memory_try_enable_merging(new_block->host, new_block->length);
+ memory_try_enable_merging(new_block->host, new_block->max_length);
}
}
/* Keep the list sorted from biggest to smallest block. */
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
- if (block->length < new_block->length) {
+ if (block->max_length < new_block->max_length) {
break;
}
}
old_ram_size, new_ram_size);
}
}
- cpu_physical_memory_set_dirty_range(new_block->offset, new_block->length);
-
- qemu_ram_setup_dump(new_block->host, new_block->length);
- qemu_madvise(new_block->host, new_block->length, QEMU_MADV_HUGEPAGE);
- qemu_madvise(new_block->host, new_block->length, QEMU_MADV_DONTFORK);
+ cpu_physical_memory_set_dirty_range(new_block->offset,
+ new_block->used_length);
- if (kvm_enabled()) {
- kvm_setup_guest_memory(new_block->host, new_block->length);
+ if (new_block->host) {
+ qemu_ram_setup_dump(new_block->host, new_block->max_length);
+ qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUGEPAGE);
+ qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_DONTFORK);
+ if (kvm_enabled()) {
+ kvm_setup_guest_memory(new_block->host, new_block->max_length);
+ }
}
return new_block->offset;
size = TARGET_PAGE_ALIGN(size);
new_block = g_malloc0(sizeof(*new_block));
new_block->mr = mr;
- new_block->length = size;
+ new_block->used_length = size;
+ new_block->max_length = size;
new_block->flags = share ? RAM_SHARED : 0;
new_block->host = file_ram_alloc(new_block, size,
mem_path, errp);
}
#endif
-ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
+static
+ram_addr_t qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size,
+ void (*resized)(const char*,
+ uint64_t length,
+ void *host),
+ void *host, bool resizeable,
MemoryRegion *mr, Error **errp)
{
RAMBlock *new_block;
Error *local_err = NULL;
size = TARGET_PAGE_ALIGN(size);
+ max_size = TARGET_PAGE_ALIGN(max_size);
new_block = g_malloc0(sizeof(*new_block));
new_block->mr = mr;
- new_block->length = size;
+ new_block->resized = resized;
+ new_block->used_length = size;
+ new_block->max_length = max_size;
+ assert(max_size >= size);
new_block->fd = -1;
new_block->host = host;
if (host) {
new_block->flags |= RAM_PREALLOC;
}
+ if (resizeable) {
+ new_block->flags |= RAM_RESIZEABLE;
+ }
addr = ram_block_add(new_block, &local_err);
if (local_err) {
g_free(new_block);
return addr;
}
+ram_addr_t qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
+ MemoryRegion *mr, Error **errp)
+{
+ return qemu_ram_alloc_internal(size, size, NULL, host, false, mr, errp);
+}
+
ram_addr_t qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp)
{
- return qemu_ram_alloc_from_ptr(size, NULL, mr, errp);
+ return qemu_ram_alloc_internal(size, size, NULL, NULL, false, mr, errp);
+}
+
+ram_addr_t qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t maxsz,
+ void (*resized)(const char*,
+ uint64_t length,
+ void *host),
+ MemoryRegion *mr, Error **errp)
+{
+ return qemu_ram_alloc_internal(size, maxsz, resized, NULL, true, mr, errp);
}
void qemu_ram_free_from_ptr(ram_addr_t addr)
xen_invalidate_map_cache_entry(block->host);
#ifndef _WIN32
} else if (block->fd >= 0) {
- munmap(block->host, block->length);
+ munmap(block->host, block->max_length);
close(block->fd);
#endif
} else {
- qemu_anon_ram_free(block->host, block->length);
+ qemu_anon_ram_free(block->host, block->max_length);
}
g_free(block);
break;
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
offset = addr - block->offset;
- if (offset < block->length) {
+ if (offset < block->max_length) {
vaddr = ramblock_ptr(block, offset);
if (block->flags & RAM_PREALLOC) {
;
return xen_map_cache(addr, 0, 0);
} else if (block->host == NULL) {
block->host =
- xen_map_cache(block->offset, block->length, 1);
+ xen_map_cache(block->offset, block->max_length, 1);
}
}
return ramblock_ptr(block, addr - block->offset);
RAMBlock *block;
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
- if (addr - block->offset < block->length) {
- if (addr - block->offset + *size > block->length)
- *size = block->length - addr + block->offset;
+ if (addr - block->offset < block->max_length) {
+ if (addr - block->offset + *size > block->max_length)
+ *size = block->max_length - addr + block->offset;
return ramblock_ptr(block, addr - block->offset);
}
}
}
block = ram_list.mru_block;
- if (block && block->host && host - block->host < block->length) {
+ if (block && block->host && host - block->host < block->max_length) {
goto found;
}
if (block->host == NULL) {
continue;
}
- if (host - block->host < block->length) {
+ if (host - block->host < block->max_length) {
goto found;
}
}
unsigned len)
{
subpage_t *subpage = opaque;
- uint8_t buf[4];
+ uint8_t buf[8];
#if defined(DEBUG_SUBPAGE)
printf("%s: subpage %p len %u addr " TARGET_FMT_plx "\n", __func__,
return lduw_p(buf);
case 4:
return ldl_p(buf);
+ case 8:
+ return ldq_p(buf);
default:
abort();
}
uint64_t value, unsigned len)
{
subpage_t *subpage = opaque;
- uint8_t buf[4];
+ uint8_t buf[8];
#if defined(DEBUG_SUBPAGE)
printf("%s: subpage %p len %u addr " TARGET_FMT_plx
case 4:
stl_p(buf, value);
break;
+ case 8:
+ stq_p(buf, value);
+ break;
default:
abort();
}
static const MemoryRegionOps subpage_ops = {
.read = subpage_read,
.write = subpage_write,
+ .impl.min_access_size = 1,
+ .impl.max_access_size = 8,
+ .valid.min_access_size = 1,
+ .valid.max_access_size = 8,
.valid.accepts = subpage_accepts,
.endianness = DEVICE_NATIVE_ENDIAN,
};
RAMBlock *block;
QTAILQ_FOREACH(block, &ram_list.blocks, next) {
- func(block->host, block->offset, block->length, opaque);
+ func(block->host, block->offset, block->used_length, opaque);
}
}
#endif
projects / qemu.git / blobdiff