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qemu/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 "qemu/osdep.h"
#include "qapi/error.h"
#ifndef _WIN32
#endif
#include "qemu/cutils.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "tcg.h"
#include "hw/qdev-core.h"
#if !defined(CONFIG_USER_ONLY)
#include "hw/boards.h"
#include "hw/xen/xen.h"
#endif
#include "sysemu/kvm.h"
#include "sysemu/sysemu.h"
#include "qemu/timer.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
#else /* !CONFIG_USER_ONLY */
#include "hw/hw.h"
#include "exec/memory.h"
#include "exec/ioport.h"
#include "sysemu/dma.h"
#include "exec/address-spaces.h"
#include "sysemu/xen-mapcache.h"
#include "trace-root.h"
#endif
#include "exec/cpu-all.h"
#include "qemu/rcu_queue.h"
#include "qemu/main-loop.h"
#include "translate-all.h"
#include "sysemu/replay.h"
#include "exec/memory-internal.h"
#include "exec/ram_addr.h"
#include "exec/log.h"
#include "migration/vmstate.h"
#include "qemu/range.h"
#ifndef _WIN32
#include "qemu/mmap-alloc.h"
#endif
//#define DEBUG_SUBPAGE
#if !defined(CONFIG_USER_ONLY)
/* ram_list is read under rcu_read_lock()/rcu_read_unlock(). Writes
* are protected by the ramlist lock.
*/
RAMList ram_list = { .blocks = QLIST_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;
/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */
#define RAM_PREALLOC (1 << 0)
/* 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
#ifdef TARGET_PAGE_BITS_VARY
int target_page_bits;
bool target_page_bits_decided;
#endif
struct CPUTailQ cpus = QTAILQ_HEAD_INITIALIZER(cpus);
/* current CPU in the current thread. It is only valid inside
cpu_exec() */
__thread CPUState *current_cpu;
/* 0 = Do not count executed instructions.
1 = Precise instruction counting.
2 = Adaptive rate instruction counting. */
int use_icount;
bool set_preferred_target_page_bits(int bits)
{
/* The target page size is the lowest common denominator for all
* the CPUs in the system, so we can only make it smaller, never
* larger. And we can't make it smaller once we've committed to
* a particular size.
*/
#ifdef TARGET_PAGE_BITS_VARY
assert(bits >= TARGET_PAGE_BITS_MIN);
if (target_page_bits == 0 || target_page_bits > bits) {
if (target_page_bits_decided) {
return false;
}
target_page_bits = bits;
}
#endif
return true;
}
#if !defined(CONFIG_USER_ONLY)
static void finalize_target_page_bits(void)
{
#ifdef TARGET_PAGE_BITS_VARY
if (target_page_bits == 0) {
target_page_bits = TARGET_PAGE_BITS_MIN;
}
target_page_bits_decided = true;
#endif
}
typedef struct PhysPageEntry PhysPageEntry;
struct PhysPageEntry {
/* How many bits skip to next level (in units of L2_SIZE). 0 for a leaf. */
uint32_t skip : 6;
/* index into phys_sections (!skip) or phys_map_nodes (skip) */
uint32_t ptr : 26;
};
#define PHYS_MAP_NODE_NIL (((uint32_t)~0) >> 6)
/* Size of the L2 (and L3, etc) page tables. */
#define ADDR_SPACE_BITS 64
#define P_L2_BITS 9
#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 {
struct rcu_head rcu;
unsigned sections_nb;
unsigned sections_nb_alloc;
unsigned nodes_nb;
unsigned nodes_nb_alloc;
Node *nodes;
MemoryRegionSection *sections;
} PhysPageMap;
struct AddressSpaceDispatch {
struct rcu_head rcu;
MemoryRegionSection *mru_section;
/* 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[];
} subpage_t;
#define PHYS_SECTION_UNASSIGNED 0
#define PHYS_SECTION_NOTDIRTY 1
#define PHYS_SECTION_ROM 2
#define PHYS_SECTION_WATCH 3
static void io_mem_init(void);
static void memory_map_init(void);
static void tcg_commit(MemoryListener *listener);
static MemoryRegion io_mem_watch;
/**
* CPUAddressSpace: all the information a CPU needs about an AddressSpace
* @cpu: the CPU whose AddressSpace this is
* @as: the AddressSpace itself
* @memory_dispatch: its dispatch pointer (cached, RCU protected)
* @tcg_as_listener: listener for tracking changes to the AddressSpace
*/
struct CPUAddressSpace {
CPUState *cpu;
AddressSpace *as;
struct AddressSpaceDispatch *memory_dispatch;
MemoryListener tcg_as_listener;
};
#endif
#if !defined(CONFIG_USER_ONLY)
static void phys_map_node_reserve(PhysPageMap *map, unsigned nodes)
{
static unsigned alloc_hint = 16;
if (map->nodes_nb + nodes > map->nodes_nb_alloc) {
map->nodes_nb_alloc = MAX(map->nodes_nb_alloc, alloc_hint);
map->nodes_nb_alloc = MAX(map->nodes_nb_alloc, map->nodes_nb + nodes);
map->nodes = g_renew(Node, map->nodes, map->nodes_nb_alloc);
alloc_hint = map->nodes_nb_alloc;
}
}
static uint32_t phys_map_node_alloc(PhysPageMap *map, bool leaf)
{
unsigned i;
uint32_t ret;
PhysPageEntry e;
PhysPageEntry *p;
ret = map->nodes_nb++;
p = map->nodes[ret];
assert(ret != PHYS_MAP_NODE_NIL);
assert(ret != map->nodes_nb_alloc);
e.skip = leaf ? 0 : 1;
e.ptr = leaf ? PHYS_SECTION_UNASSIGNED : PHYS_MAP_NODE_NIL;
for (i = 0; i < P_L2_SIZE; ++i) {
memcpy(&p[i], &e, sizeof(e));
}
return ret;
}
static void phys_page_set_level(PhysPageMap *map, PhysPageEntry *lp,
hwaddr *index, hwaddr *nb, uint16_t leaf,
int level)
{
PhysPageEntry *p;
hwaddr step = (hwaddr)1 << (level * P_L2_BITS);
if (lp->skip && lp->ptr == PHYS_MAP_NODE_NIL) {
lp->ptr = phys_map_node_alloc(map, level == 0);
}
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);
}
/* Compact a non leaf page entry. Simply detect that the entry has a single child,
* and update our entry so we can skip it and go directly to the destination.
*/
static void phys_page_compact(PhysPageEntry *lp, Node *nodes)
{
unsigned valid_ptr = P_L2_SIZE;
int valid = 0;
PhysPageEntry *p;
int i;
if (lp->ptr == PHYS_MAP_NODE_NIL) {
return;
}
p = nodes[lp->ptr];
for (i = 0; i < P_L2_SIZE; i++) {
if (p[i].ptr == PHYS_MAP_NODE_NIL) {
continue;
}
valid_ptr = i;
valid++;
if (p[i].skip) {
phys_page_compact(&p[i], nodes);
}
}
/* We can only compress if there's only one child. */
if (valid != 1) {
return;
}
assert(valid_ptr < P_L2_SIZE);
/* Don't compress if it won't fit in the # of bits we have. */
if (lp->skip + p[valid_ptr].skip >= (1 << 3)) {
return;
}
lp->ptr = p[valid_ptr].ptr;
if (!p[valid_ptr].skip) {
/* If our only child is a leaf, make this a leaf. */
/* By design, we should have made this node a leaf to begin with so we
* should never reach here.
* But since it's so simple to handle this, let's do it just in case we
* change this rule.
*/
lp->skip = 0;
} else {
lp->skip += p[valid_ptr].skip;
}
}
static void phys_page_compact_all(AddressSpaceDispatch *d, int nodes_nb)
{
if (d->phys_map.skip) {
phys_page_compact(&d->phys_map, d->map.nodes);
}
}
static inline bool section_covers_addr(const MemoryRegionSection *section,
hwaddr addr)
{
/* Memory topology clips a memory region to [0, 2^64); size.hi > 0 means
* the section must cover the entire address space.
*/
return int128_gethi(section->size) ||
range_covers_byte(section->offset_within_address_space,
int128_getlo(section->size), addr);
}
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 &sections[PHYS_SECTION_UNASSIGNED];
}
p = nodes[lp.ptr];
lp = p[(index >> (i * P_L2_BITS)) & (P_L2_SIZE - 1)];
}
if (section_covers_addr(&sections[lp.ptr], addr)) {
return &sections[lp.ptr];
} else {
return &sections[PHYS_SECTION_UNASSIGNED];
}
}
bool memory_region_is_unassigned(MemoryRegion *mr)
{
return mr != &io_mem_rom && mr != &io_mem_notdirty && !mr->rom_device
&& mr != &io_mem_watch;
}
/* Called from RCU critical section */
static MemoryRegionSection *address_space_lookup_region(AddressSpaceDispatch *d,
hwaddr addr,
bool resolve_subpage)
{
MemoryRegionSection *section = atomic_read(&d->mru_section);
subpage_t *subpage;
bool update;
if (section && section != &d->map.sections[PHYS_SECTION_UNASSIGNED] &&
section_covers_addr(section, addr)) {
update = false;
} else {
section = phys_page_find(d->phys_map, addr, d->map.nodes,
d->map.sections);
update = true;
}
if (resolve_subpage && section->mr->subpage) {
subpage = container_of(section->mr, subpage_t, iomem);
section = &d->map.sections[subpage->sub_section[SUBPAGE_IDX(addr)]];
}
if (update) {
atomic_set(&d->mru_section, section);
}
return section;
}
/* Called from RCU critical section */
static MemoryRegionSection *
address_space_translate_internal(AddressSpaceDispatch *d, hwaddr addr, hwaddr *xlat,
hwaddr *plen, bool resolve_subpage)
{
MemoryRegionSection *section;
MemoryRegion *mr;
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;
mr = section->mr;
/* MMIO registers can be expected to perform full-width accesses based only
* on their address, without considering adjacent registers that could
* decode to completely different MemoryRegions. When such registers
* exist (e.g. I/O ports 0xcf8 and 0xcf9 on most PC chipsets), MMIO
* regions overlap wildly. For this reason we cannot clamp the accesses
* here.
*
* If the length is small (as is the case for address_space_ldl/stl),
* everything works fine. If the incoming length is large, however,
* the caller really has to do the clamping through memory_access_size.
*/
if (memory_region_is_ram(mr)) {
diff = int128_sub(section->size, int128_make64(addr));
*plen = int128_get64(int128_min(diff, int128_make64(*plen)));
}
return section;
}
/* Called from RCU critical section */
IOMMUTLBEntry address_space_get_iotlb_entry(AddressSpace *as, hwaddr addr,
bool is_write)
{
IOMMUTLBEntry iotlb = {0};
MemoryRegionSection *section;
MemoryRegion *mr;
for (;;) {
AddressSpaceDispatch *d = atomic_rcu_read(&as->dispatch);
section = address_space_lookup_region(d, addr, false);
addr = addr - section->offset_within_address_space
+ section->offset_within_region;
mr = section->mr;
if (!mr->iommu_ops) {
break;
}
iotlb = mr->iommu_ops->translate(mr, addr, is_write);
if (!(iotlb.perm & (1 << is_write))) {
iotlb.target_as = NULL;
break;
}
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
as = iotlb.target_as;
}
return iotlb;
}
/* Called from RCU critical section */
MemoryRegion *address_space_translate(AddressSpace *as, hwaddr addr,
hwaddr *xlat, hwaddr *plen,
bool is_write)
{
IOMMUTLBEntry iotlb;
MemoryRegionSection *section;
MemoryRegion *mr;
for (;;) {
AddressSpaceDispatch *d = atomic_rcu_read(&as->dispatch);
section = address_space_translate_internal(d, addr, &addr, plen, true);
mr = section->mr;
if (!mr->iommu_ops) {
break;
}
iotlb = mr->iommu_ops->translate(mr, addr, is_write);
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
*plen = MIN(*plen, (addr | iotlb.addr_mask) - addr + 1);
if (!(iotlb.perm & (1 << is_write))) {
mr = &io_mem_unassigned;
break;
}
as = iotlb.target_as;
}
if (xen_enabled() && memory_access_is_direct(mr, is_write)) {
hwaddr page = ((addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE) - addr;
*plen = MIN(page, *plen);
}
*xlat = addr;
return mr;
}
/* Called from RCU critical section */
MemoryRegionSection *
address_space_translate_for_iotlb(CPUState *cpu, int asidx, hwaddr addr,
hwaddr *xlat, hwaddr *plen)
{
MemoryRegionSection *section;
AddressSpaceDispatch *d = atomic_rcu_read(&cpu->cpu_ases[asidx].memory_dispatch);
section = address_space_translate_internal(d, addr, xlat, plen, false);
assert(!section->mr->iommu_ops);
return section;
}
#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);
return 0;
}
static int cpu_common_pre_load(void *opaque)
{
CPUState *cpu = opaque;
cpu->exception_index = -1;
return 0;
}
static bool cpu_common_exception_index_needed(void *opaque)
{
CPUState *cpu = opaque;
return tcg_enabled() && cpu->exception_index != -1;
}
static const VMStateDescription vmstate_cpu_common_exception_index = {
.name = "cpu_common/exception_index",
.version_id = 1,
.minimum_version_id = 1,
.needed = cpu_common_exception_index_needed,
.fields = (VMStateField[]) {
VMSTATE_INT32(exception_index, CPUState),
VMSTATE_END_OF_LIST()
}
};
static bool cpu_common_crash_occurred_needed(void *opaque)
{
CPUState *cpu = opaque;
return cpu->crash_occurred;
}
static const VMStateDescription vmstate_cpu_common_crash_occurred = {
.name = "cpu_common/crash_occurred",
.version_id = 1,
.minimum_version_id = 1,
.needed = cpu_common_crash_occurred_needed,
.fields = (VMStateField[]) {
VMSTATE_BOOL(crash_occurred, CPUState),
VMSTATE_END_OF_LIST()
}
};
const VMStateDescription vmstate_cpu_common = {
.name = "cpu_common",
.version_id = 1,
.minimum_version_id = 1,
.pre_load = cpu_common_pre_load,
.post_load = cpu_common_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT32(halted, CPUState),
VMSTATE_UINT32(interrupt_request, CPUState),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_cpu_common_exception_index,
&vmstate_cpu_common_crash_occurred,
NULL
}
};
#endif
CPUState *qemu_get_cpu(int index)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (cpu->cpu_index == index) {
return cpu;
}
}
return NULL;
}
#if !defined(CONFIG_USER_ONLY)
void cpu_address_space_init(CPUState *cpu, AddressSpace *as, int asidx)
{
CPUAddressSpace *newas;
/* Target code should have set num_ases before calling us */
assert(asidx < cpu->num_ases);
if (asidx == 0) {
/* address space 0 gets the convenience alias */
cpu->as = as;
}
/* KVM cannot currently support multiple address spaces. */
assert(asidx == 0 || !kvm_enabled());
if (!cpu->cpu_ases) {
cpu->cpu_ases = g_new0(CPUAddressSpace, cpu->num_ases);
}
newas = &cpu->cpu_ases[asidx];
newas->cpu = cpu;
newas->as = as;
if (tcg_enabled()) {
newas->tcg_as_listener.commit = tcg_commit;
memory_listener_register(&newas->tcg_as_listener, as);
}
}
AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx)
{
/* Return the AddressSpace corresponding to the specified index */
return cpu->cpu_ases[asidx].as;
}
#endif
void cpu_exec_unrealizefn(CPUState *cpu)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
cpu_list_remove(cpu);
if (cc->vmsd != NULL) {
vmstate_unregister(NULL, cc->vmsd, cpu);
}
if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
}
}
void cpu_exec_initfn(CPUState *cpu)
{
cpu->as = NULL;
cpu->num_ases = 0;
#ifndef CONFIG_USER_ONLY
cpu->thread_id = qemu_get_thread_id();
/* This is a softmmu CPU object, so create a property for it
* so users can wire up its memory. (This can't go in qom/cpu.c
* because that file is compiled only once for both user-mode
* and system builds.) The default if no link is set up is to use
* the system address space.
*/
object_property_add_link(OBJECT(cpu), "memory", TYPE_MEMORY_REGION,
(Object **)&cpu->memory,
qdev_prop_allow_set_link_before_realize,
OBJ_PROP_LINK_UNREF_ON_RELEASE,
&error_abort);
cpu->memory = system_memory;
object_ref(OBJECT(cpu->memory));
#endif
}
void cpu_exec_realizefn(CPUState *cpu, Error **errp)
{
CPUClass *cc ATTRIBUTE_UNUSED = CPU_GET_CLASS(cpu);
cpu_list_add(cpu);
#ifndef CONFIG_USER_ONLY
if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
}
if (cc->vmsd != NULL) {
vmstate_register(NULL, cpu->cpu_index, cc->vmsd, cpu);
}
#endif
}
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
{
/* Flush the whole TB as this will not have race conditions
* even if we don't have proper locking yet.
* Ideally we would just invalidate the TBs for the
* specified PC.
*/
tb_flush(cpu);
}
#if defined(CONFIG_USER_ONLY)
void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
{
}
int cpu_watchpoint_remove(CPUState *cpu, vaddr addr, vaddr len,
int flags)
{
return -ENOSYS;
}
void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint)
{
}
int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
int flags, CPUWatchpoint **watchpoint)
{
return -ENOSYS;
}
#else
/* Add a watchpoint. */
int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
int flags, CPUWatchpoint **watchpoint)
{
CPUWatchpoint *wp;
/* forbid ranges which are empty or run off the end of the address space */
if (len == 0 || (addr + len - 1) < addr) {
error_report("tried to set invalid watchpoint at %"
VADDR_PRIx ", len=%" VADDR_PRIu, addr, len);
return -EINVAL;
}
wp = g_malloc(sizeof(*wp));
wp->vaddr = addr;
wp->len = len;
wp->flags = flags;
/* keep all GDB-injected watchpoints in front */
if (flags & BP_GDB) {
QTAILQ_INSERT_HEAD(&cpu->watchpoints, wp, entry);
} else {
QTAILQ_INSERT_TAIL(&cpu->watchpoints, wp, entry);
}
tlb_flush_page(cpu, addr);
if (watchpoint)
*watchpoint = wp;
return 0;
}
/* Remove a specific watchpoint. */
int cpu_watchpoint_remove(CPUState *cpu, vaddr addr, vaddr len,
int flags)
{
CPUWatchpoint *wp;
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
if (addr == wp->vaddr && len == wp->len
&& flags == (wp->flags & ~BP_WATCHPOINT_HIT)) {
cpu_watchpoint_remove_by_ref(cpu, wp);
return 0;
}
}
return -ENOENT;
}
/* Remove a specific watchpoint by reference. */
void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint)
{
QTAILQ_REMOVE(&cpu->watchpoints, watchpoint, entry);
tlb_flush_page(cpu, watchpoint->vaddr);
g_free(watchpoint);
}
/* Remove all matching watchpoints. */
void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
{
CPUWatchpoint *wp, *next;
QTAILQ_FOREACH_SAFE(wp, &cpu->watchpoints, entry, next) {
if (wp->flags & mask) {
cpu_watchpoint_remove_by_ref(cpu, wp);
}
}
}
/* Return true if this watchpoint address matches the specified
* access (ie the address range covered by the watchpoint overlaps
* partially or completely with the address range covered by the
* access).
*/
static inline bool cpu_watchpoint_address_matches(CPUWatchpoint *wp,
vaddr addr,
vaddr len)
{
/* We know the lengths are non-zero, but a little caution is
* required to avoid errors in the case where the range ends
* exactly at the top of the address space and so addr + len
* wraps round to zero.
*/
vaddr wpend = wp->vaddr + wp->len - 1;
vaddr addrend = addr + len - 1;
return !(addr > wpend || wp->vaddr > addrend);
}
#endif
/* Add a breakpoint. */
int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
CPUBreakpoint **breakpoint)
{
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(&cpu->breakpoints, bp, entry);
} else {
QTAILQ_INSERT_TAIL(&cpu->breakpoints, bp, entry);
}
breakpoint_invalidate(cpu, pc);
if (breakpoint) {
*breakpoint = bp;
}
return 0;
}
/* Remove a specific breakpoint. */
int cpu_breakpoint_remove(CPUState *cpu, vaddr pc, int flags)
{
CPUBreakpoint *bp;
QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
if (bp->pc == pc && bp->flags == flags) {
cpu_breakpoint_remove_by_ref(cpu, bp);
return 0;
}
}
return -ENOENT;
}
/* Remove a specific breakpoint by reference. */
void cpu_breakpoint_remove_by_ref(CPUState *cpu, CPUBreakpoint *breakpoint)
{
QTAILQ_REMOVE(&cpu->breakpoints, breakpoint, entry);
breakpoint_invalidate(cpu, breakpoint->pc);
g_free(breakpoint);
}
/* Remove all matching breakpoints. */
void cpu_breakpoint_remove_all(CPUState *cpu, int mask)
{
CPUBreakpoint *bp, *next;
QTAILQ_FOREACH_SAFE(bp, &cpu->breakpoints, entry, next) {
if (bp->flags & mask) {
cpu_breakpoint_remove_by_ref(cpu, bp);
}
}
}
/* 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 (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 */
tb_flush(cpu);
}
}
}
void cpu_abort(CPUState *cpu, const char *fmt, ...)
{
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_separate()) {
qemu_log_lock();
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_unlock();
qemu_log_close();
}
va_end(ap2);
va_end(ap);
replay_finish();
#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)
/* Called from RCU critical section */
static RAMBlock *qemu_get_ram_block(ram_addr_t addr)
{
RAMBlock *block;
block = atomic_rcu_read(&ram_list.mru_block);
if (block && addr - block->offset < block->max_length) {
return block;
}
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
if (addr - block->offset < block->max_length) {
goto found;
}
}
fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr);
abort();
found:
/* It is safe to write mru_block outside the iothread lock. This
* is what happens:
*
* mru_block = xxx
* rcu_read_unlock()
* xxx removed from list
* rcu_read_lock()
* read mru_block
* mru_block = NULL;
* call_rcu(reclaim_ramblock, xxx);
* rcu_read_unlock()
*
* atomic_rcu_set is not needed here. The block was already published
* when it was placed into the list. Here we're just making an extra
* copy of the pointer.
*/
ram_list.mru_block = block;
return block;
}
static void tlb_reset_dirty_range_all(ram_addr_t start, ram_addr_t length)
{
CPUState *cpu;
ram_addr_t start1;
RAMBlock *block;
ram_addr_t end;
end = TARGET_PAGE_ALIGN(start + length);
start &= TARGET_PAGE_MASK;
rcu_read_lock();
block = qemu_get_ram_block(start);
assert(block == qemu_get_ram_block(end - 1));
start1 = (uintptr_t)ramblock_ptr(block, start - block->offset);
CPU_FOREACH(cpu) {
tlb_reset_dirty(cpu, start1, length);
}
rcu_read_unlock();
}
/* Note: start and end must be within the same ram block. */
bool cpu_physical_memory_test_and_clear_dirty(ram_addr_t start,
ram_addr_t length,
unsigned client)
{
DirtyMemoryBlocks *blocks;
unsigned long end, page;
bool dirty = false;
if (length == 0) {
return false;
}
end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
page = start >> TARGET_PAGE_BITS;
rcu_read_lock();
blocks = atomic_rcu_read(&ram_list.dirty_memory[client]);
while (page < end) {
unsigned long idx = page / DIRTY_MEMORY_BLOCK_SIZE;
unsigned long offset = page % DIRTY_MEMORY_BLOCK_SIZE;
unsigned long num = MIN(end - page, DIRTY_MEMORY_BLOCK_SIZE - offset);
dirty |= bitmap_test_and_clear_atomic(blocks->blocks[idx],
offset, num);
page += num;
}
rcu_read_unlock();
if (dirty && tcg_enabled()) {
tlb_reset_dirty_range_all(start, length);
}
return dirty;
}
/* Called from RCU critical section */
hwaddr memory_region_section_get_iotlb(CPUState *cpu,
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) + xlat;
if (!section->readonly) {
iotlb |= PHYS_SECTION_NOTDIRTY;
} else {
iotlb |= PHYS_SECTION_ROM;
}
} else {
AddressSpaceDispatch *d;
d = atomic_rcu_read(&section->address_space->dispatch);
iotlb = section - d->map.sections;
iotlb += xlat;
}
/* Make accesses to pages with watchpoints go via the
watchpoint trap routines. */
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
if (cpu_watchpoint_address_matches(wp, vaddr, TARGET_PAGE_SIZE)) {
/* 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, uint64_t *align) =
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, uint64_t *align))
{
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)
{
bool have_sub_page = mr->subpage;
memory_region_unref(mr);
if (have_sub_page) {
subpage_t *subpage = container_of(mr, subpage_t, iomem);
object_unref(OBJECT(&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.address_space = d->as;
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__
static int64_t get_file_size(int fd)
{
int64_t size = lseek(fd, 0, SEEK_END);
if (size < 0) {
return -errno;
}
return size;
}
static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
const char *path,
Error **errp)
{
bool unlink_on_error = false;
char *filename;
char *sanitized_name;
char *c;
void *area = MAP_FAILED;
int fd = -1;
int64_t file_size;
if (kvm_enabled() && !kvm_has_sync_mmu()) {
error_setg(errp,
"host lacks kvm mmu notifiers, -mem-path unsupported");
return NULL;
}
for (;;) {
fd = open(path, O_RDWR);
if (fd >= 0) {
/* @path names an existing file, use it */
break;
}
if (errno == ENOENT) {
/* @path names a file that doesn't exist, create it */
fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0644);
if (fd >= 0) {
unlink_on_error = true;
break;
}
} else if (errno == EISDIR) {
/* @path names a directory, create a file there */
/* Make name safe to use with mkstemp by replacing '/' with '_'. */
sanitized_name = g_strdup(memory_region_name(block->mr));
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) {
unlink(filename);
g_free(filename);
break;
}
g_free(filename);
}
if (errno != EEXIST && errno != EINTR) {
error_setg_errno(errp, errno,
"can't open backing store %s for guest RAM",
path);
goto error;
}
/*
* Try again on EINTR and EEXIST. The latter happens when
* something else creates the file between our two open().
*/
}
block->page_size = qemu_fd_getpagesize(fd);
block->mr->align = block->page_size;
#if defined(__s390x__)
if (kvm_enabled()) {
block->mr->align = MAX(block->mr->align, QEMU_VMALLOC_ALIGN);
}
#endif
file_size = get_file_size(fd);
if (memory < block->page_size) {
error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to "
"or larger than page size 0x%zx",
memory, block->page_size);
goto error;
}
if (file_size > 0 && file_size < memory) {
error_setg(errp, "backing store %s size 0x%" PRIx64
" does not match 'size' option 0x" RAM_ADDR_FMT,
path, file_size, memory);
goto error;
}
memory = ROUND_UP(memory, block->page_size);
/*
* 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.
*
* Do not truncate the non-empty backend file to avoid corrupting
* the existing data in the file. Disabling shrinking is not
* enough. For example, the current vNVDIMM implementation stores
* the guest NVDIMM labels at the end of the backend file. If the
* backend file is later extended, QEMU will not be able to find
* those labels. Therefore, extending the non-empty backend file
* is disabled as well.
*/
if (!file_size && ftruncate(fd, memory)) {
perror("ftruncate");
}
area = qemu_ram_mmap(fd, memory, block->mr->align,
block->flags & RAM_SHARED);
if (area == MAP_FAILED) {
error_setg_errno(errp, errno,
"unable to map backing store for guest RAM");
goto error;
}
if (mem_prealloc) {
os_mem_prealloc(fd, area, memory, errp);
if (errp && *errp) {
goto error;
}
}
block->fd = fd;
return area;
error:
if (area != MAP_FAILED) {
qemu_ram_munmap(area, memory);
}
if (unlink_on_error) {
unlink(path);
}
if (fd != -1) {
close(fd);
}
return NULL;
}
#endif
/* Called with the ramlist lock held. */
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 (QLIST_EMPTY_RCU(&ram_list.blocks)) {
return 0;
}
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
ram_addr_t end, next = RAM_ADDR_MAX;
end = block->offset + block->max_length;
QLIST_FOREACH_RCU(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;
rcu_read_lock();
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
last = MAX(last, block->offset + block->max_length);
}
rcu_read_unlock();
return last;
}
static void qemu_ram_setup_dump(void *addr, ram_addr_t size)
{
int ret;
/* Use MADV_DONTDUMP, if user doesn't want the guest memory in the core */
if (!machine_dump_guest_core(current_machine)) {
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");
}
}
}
const char *qemu_ram_get_idstr(RAMBlock *rb)
{
return rb->idstr;
}
/* Called with iothread lock held. */
void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev)
{
RAMBlock *block;
assert(new_block);
assert(!new_block->idstr[0]);
if (dev) {
char *id = qdev_get_dev_path(dev);
if (id) {
snprintf(new_block->idstr, sizeof(new_block->idstr), "%s/", id);
g_free(id);
}
}
pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
rcu_read_lock();
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
if (block != new_block &&
!strcmp(block->idstr, new_block->idstr)) {
fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
new_block->idstr);
abort();
}
}
rcu_read_unlock();
}
/* Called with iothread lock held. */
void qemu_ram_unset_idstr(RAMBlock *block)
{
/* FIXME: arch_init.c assumes that this is not called throughout
* migration. Ignore the problem since hot-unplug during migration
* does not work anyway.
*/
if (block) {
memset(block->idstr, 0, sizeof(block->idstr));
}
}
size_t qemu_ram_pagesize(RAMBlock *rb)
{
return rb->page_size;
}
static int memory_try_enable_merging(void *addr, size_t len)
{
if (!machine_mem_merge(current_machine)) {
/* disabled by the user */
return 0;
}
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(RAMBlock *block, ram_addr_t newsize, Error **errp)
{
assert(block);
newsize = HOST_PAGE_ALIGN(newsize);
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,
DIRTY_CLIENTS_ALL);
memory_region_set_size(block->mr, newsize);
if (block->resized) {
block->resized(block->idstr, newsize, block->host);
}
return 0;
}
/* Called with ram_list.mutex held */
static void dirty_memory_extend(ram_addr_t old_ram_size,
ram_addr_t new_ram_size)
{
ram_addr_t old_num_blocks = DIV_ROUND_UP(old_ram_size,
DIRTY_MEMORY_BLOCK_SIZE);
ram_addr_t new_num_blocks = DIV_ROUND_UP(new_ram_size,
DIRTY_MEMORY_BLOCK_SIZE);
int i;
/* Only need to extend if block count increased */
if (new_num_blocks <= old_num_blocks) {
return;
}
for (i = 0; i < DIRTY_MEMORY_NUM; i++) {
DirtyMemoryBlocks *old_blocks;
DirtyMemoryBlocks *new_blocks;
int j;
old_blocks = atomic_rcu_read(&ram_list.dirty_memory[i]);
new_blocks = g_malloc(sizeof(*new_blocks) +
sizeof(new_blocks->blocks[0]) * new_num_blocks);
if (old_num_blocks) {
memcpy(new_blocks->blocks, old_blocks->blocks,
old_num_blocks * sizeof(old_blocks->blocks[0]));
}
for (j = old_num_blocks; j < new_num_blocks; j++) {
new_blocks->blocks[j] = bitmap_new(DIRTY_MEMORY_BLOCK_SIZE);
}
atomic_rcu_set(&ram_list.dirty_memory[i], new_blocks);
if (old_blocks) {
g_free_rcu(old_blocks, rcu);
}
}
}
static void ram_block_add(RAMBlock *new_block, Error **errp)
{
RAMBlock *block;
RAMBlock *last_block = NULL;
ram_addr_t old_ram_size, new_ram_size;
Error *err = NULL;
old_ram_size = last_ram_offset() >> TARGET_PAGE_BITS;
qemu_mutex_lock_ramlist();
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->max_length,
new_block->mr, &err);
if (err) {
error_propagate(errp, err);
qemu_mutex_unlock_ramlist();
return;
}
} else {
new_block->host = phys_mem_alloc(new_block->max_length,
&new_block->mr->align);
if (!new_block->host) {
error_setg_errno(errp, errno,
"cannot set up guest memory '%s'",
memory_region_name(new_block->mr));
qemu_mutex_unlock_ramlist();
return;
}
memory_try_enable_merging(new_block->host, new_block->max_length);
}
}
new_ram_size = MAX(old_ram_size,
(new_block->offset + new_block->max_length) >> TARGET_PAGE_BITS);
if (new_ram_size > old_ram_size) {
migration_bitmap_extend(old_ram_size, new_ram_size);
dirty_memory_extend(old_ram_size, new_ram_size);
}
/* Keep the list sorted from biggest to smallest block. Unlike QTAILQ,
* QLIST (which has an RCU-friendly variant) does not have insertion at
* tail, so save the last element in last_block.
*/
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
last_block = block;
if (block->max_length < new_block->max_length) {
break;
}
}
if (block) {
QLIST_INSERT_BEFORE_RCU(block, new_block, next);
} else if (last_block) {
QLIST_INSERT_AFTER_RCU(last_block, new_block, next);
} else { /* list is empty */
QLIST_INSERT_HEAD_RCU(&ram_list.blocks, new_block, next);
}
ram_list.mru_block = NULL;
/* Write list before version */
smp_wmb();
ram_list.version++;
qemu_mutex_unlock_ramlist();
cpu_physical_memory_set_dirty_range(new_block->offset,
new_block->used_length,
DIRTY_CLIENTS_ALL);
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);
/* MADV_DONTFORK is also needed by KVM in absence of synchronous MMU */
qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_DONTFORK);
ram_block_notify_add(new_block->host, new_block->max_length);
}
}
#ifdef __linux__
RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
bool share, const char *mem_path,
Error **errp)
{
RAMBlock *new_block;
Error *local_err = NULL;
if (xen_enabled()) {
error_setg(errp, "-mem-path not supported with Xen");
return NULL;
}
if (phys_mem_alloc != qemu_anon_ram_alloc) {
/*
* file_ram_alloc() needs to allocate just like
* phys_mem_alloc, but we haven't bothered to provide
* a hook there.
*/
error_setg(errp,
"-mem-path not supported with this accelerator");
return NULL;
}
size = HOST_PAGE_ALIGN(size);
new_block = g_malloc0(sizeof(*new_block));
new_block->mr = mr;
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);
if (!new_block->host) {
g_free(new_block);
return NULL;
}
ram_block_add(new_block, &local_err);
if (local_err) {
g_free(new_block);
error_propagate(errp, local_err);
return NULL;
}
return new_block;
}
#endif
static
RAMBlock *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 = HOST_PAGE_ALIGN(size);
max_size = HOST_PAGE_ALIGN(max_size);
new_block = g_malloc0(sizeof(*new_block));
new_block->mr = mr;
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->page_size = getpagesize();
new_block->host = host;
if (host) {
new_block->flags |= RAM_PREALLOC;
}
if (resizeable) {
new_block->flags |= RAM_RESIZEABLE;
}
ram_block_add(new_block, &local_err);
if (local_err) {
g_free(new_block);
error_propagate(errp, local_err);
return NULL;
}
return new_block;
}
RAMBlock *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);
}
RAMBlock *qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp)
{
return qemu_ram_alloc_internal(size, size, NULL, NULL, false, mr, errp);
}
RAMBlock *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);
}
static void reclaim_ramblock(RAMBlock *block)
{
if (block->flags & RAM_PREALLOC) {
;
} else if (xen_enabled()) {
xen_invalidate_map_cache_entry(block->host);
#ifndef _WIN32
} else if (block->fd >= 0) {
qemu_ram_munmap(block->host, block->max_length);
close(block->fd);
#endif
} else {
qemu_anon_ram_free(block->host, block->max_length);
}
g_free(block);
}
void qemu_ram_free(RAMBlock *block)
{
if (!block) {
return;
}
if (block->host) {
ram_block_notify_remove(block->host, block->max_length);
}
qemu_mutex_lock_ramlist();
QLIST_REMOVE_RCU(block, next);
ram_list.mru_block = NULL;
/* Write list before version */
smp_wmb();
ram_list.version++;
call_rcu(block, reclaim_ramblock, rcu);
qemu_mutex_unlock_ramlist();
}
#ifndef _WIN32
void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
{
RAMBlock *block;
ram_addr_t offset;
int flags;
void *area, *vaddr;
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
offset = addr - block->offset;
if (offset < block->max_length) {
vaddr = ramblock_ptr(block, offset);
if (block->flags & RAM_PREALLOC) {
;
} else if (xen_enabled()) {
abort();
} else {
flags = MAP_FIXED;
if (block->fd >= 0) {
flags |= (block->flags & RAM_SHARED ?
MAP_SHARED : MAP_PRIVATE);
area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
flags, block->fd, offset);
} else {
/*
* Remap needs to match alloc. Accelerators that
* set phys_mem_alloc never remap. If they did,
* we'd need a remap hook here.
*/
assert(phys_mem_alloc == qemu_anon_ram_alloc);
flags |= MAP_PRIVATE | MAP_ANONYMOUS;
area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
flags, -1, 0);
}
if (area != vaddr) {
fprintf(stderr, "Could not remap addr: "
RAM_ADDR_FMT "@" RAM_ADDR_FMT "\n",
length, addr);
exit(1);
}
memory_try_enable_merging(vaddr, length);
qemu_ram_setup_dump(vaddr, length);
}
}
}
}
#endif /* !_WIN32 */
/* Return a host pointer to ram allocated with qemu_ram_alloc.
* This should not be used for general purpose DMA. Use address_space_map
* or address_space_rw instead. For local memory (e.g. video ram) that the
* device owns, use memory_region_get_ram_ptr.
*
* Called within RCU critical section.
*/
void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr)
{
RAMBlock *block = ram_block;
if (block == NULL) {
block = qemu_get_ram_block(addr);
addr -= block->offset;
}
if (xen_enabled() && block->host == NULL) {
/* We need to check if the requested address is in the RAM
* because we don't want to map the entire memory in QEMU.
* In that case just map until the end of the page.
*/
if (block->offset == 0) {
return xen_map_cache(addr, 0, 0);
}
block->host = xen_map_cache(block->offset, block->max_length, 1);
}
return ramblock_ptr(block, addr);
}
/* Return a host pointer to guest's ram. Similar to qemu_map_ram_ptr
* but takes a size argument.
*
* Called within RCU critical section.
*/
static void *qemu_ram_ptr_length(RAMBlock *ram_block, ram_addr_t addr,
hwaddr *size)
{
RAMBlock *block = ram_block;
if (*size == 0) {
return NULL;
}
if (block == NULL) {
block = qemu_get_ram_block(addr);
addr -= block->offset;
}
*size = MIN(*size, block->max_length - addr);
if (xen_enabled() && block->host == NULL) {
/* We need to check if the requested address is in the RAM
* because we don't want to map the entire memory in QEMU.
* In that case just map the requested area.
*/
if (block->offset == 0) {
return xen_map_cache(addr, *size, 1);
}
block->host = xen_map_cache(block->offset, block->max_length, 1);
}
return ramblock_ptr(block, addr);
}
/*
* Translates a host ptr back to a RAMBlock, a ram_addr and an offset
* in that RAMBlock.
*
* ptr: Host pointer to look up
* round_offset: If true round the result offset down to a page boundary
* *ram_addr: set to result ram_addr
* *offset: set to result offset within the RAMBlock
*
* Returns: RAMBlock (or NULL if not found)
*
* By the time this function returns, the returned pointer is not protected
* by RCU anymore. If the caller is not within an RCU critical section and
* does not hold the iothread lock, it must have other means of protecting the
* pointer, such as a reference to the region that includes the incoming
* ram_addr_t.
*/
RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
ram_addr_t *offset)
{
RAMBlock *block;
uint8_t *host = ptr;
if (xen_enabled()) {
ram_addr_t ram_addr;
rcu_read_lock();
ram_addr = xen_ram_addr_from_mapcache(ptr);
block = qemu_get_ram_block(ram_addr);
if (block) {
*offset = ram_addr - block->offset;
}
rcu_read_unlock();
return block;
}
rcu_read_lock();
block = atomic_rcu_read(&ram_list.mru_block);
if (block && block->host && host - block->host < block->max_length) {
goto found;
}
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
/* This case append when the block is not mapped. */
if (block->host == NULL) {
continue;
}
if (host - block->host < block->max_length) {
goto found;
}
}
rcu_read_unlock();
return NULL;
found:
*offset = (host - block->host);
if (round_offset) {
*offset &= TARGET_PAGE_MASK;
}
rcu_read_unlock();
return block;
}
/*
* Finds the named RAMBlock
*
* name: The name of RAMBlock to find
*
* Returns: RAMBlock (or NULL if not found)
*/
RAMBlock *qemu_ram_block_by_name(const char *name)
{
RAMBlock *block;
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
if (!strcmp(name, block->idstr)) {
return block;
}
}
return NULL;
}
/* Some of the softmmu routines need to translate from a host pointer
(typically a TLB entry) back to a ram offset. */
ram_addr_t qemu_ram_addr_from_host(void *ptr)
{
RAMBlock *block;
ram_addr_t offset;
block = qemu_ram_block_from_host(ptr, false, &offset);
if (!block) {
return RAM_ADDR_INVALID;
}
return block->offset + offset;
}
/* Called within RCU critical section. */
static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
uint64_t val, unsigned size)
{
bool locked = false;
if (!cpu_physical_memory_get_dirty_flag(ram_addr, DIRTY_MEMORY_CODE)) {
locked = true;
tb_lock();
tb_invalidate_phys_page_fast(ram_addr, size);
}
switch (size) {
case 1:
stb_p(qemu_map_ram_ptr(NULL, ram_addr), val);
break;
case 2:
stw_p(qemu_map_ram_ptr(NULL, ram_addr), val);
break;
case 4:
stl_p(qemu_map_ram_ptr(NULL, ram_addr), val);
break;
default:
abort();
}
if (locked) {
tb_unlock();
}
/* Set both VGA and migration bits for simplicity and to remove
* the notdirty callback faster.
*/
cpu_physical_memory_set_dirty_range(ram_addr, size,
DIRTY_CLIENTS_NOCODE);
/* we remove the notdirty callback only if the code has been
flushed */
if (!cpu_physical_memory_is_clean(ram_addr)) {
tlb_set_dirty(current_cpu, current_cpu->mem_io_vaddr);
}
}
static bool notdirty_mem_accepts(void *opaque, hwaddr addr,
unsigned size, bool is_write)
{
return is_write;
}
static const MemoryRegionOps notdirty_mem_ops = {
.write = notdirty_mem_write,
.valid.accepts = notdirty_mem_accepts,
.endianness = DEVICE_NATIVE_ENDIAN,
};
/* Generate a debug exception if a watchpoint has been hit. */
static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
{
CPUState *cpu = current_cpu;
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUArchState *env = cpu->env_ptr;
target_ulong pc, cs_base;
target_ulong vaddr;
CPUWatchpoint *wp;
uint32_t cpu_flags;
if (cpu->watchpoint_hit) {
/* We re-entered the check after replacing the TB. Now raise
* the debug interrupt so that is will trigger after the
* current instruction. */
cpu_interrupt(cpu, CPU_INTERRUPT_DEBUG);
return;
}
vaddr = (cpu->mem_io_vaddr & TARGET_PAGE_MASK) + offset;
vaddr = cc->adjust_watchpoint_address(cpu, vaddr, len);
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
if (cpu_watchpoint_address_matches(wp, vaddr, len)
&& (wp->flags & flags)) {
if (flags == BP_MEM_READ) {
wp->flags |= BP_WATCHPOINT_HIT_READ;
} else {
wp->flags |= BP_WATCHPOINT_HIT_WRITE;
}
wp->hitaddr = vaddr;
wp->hitattrs = attrs;
if (!cpu->watchpoint_hit) {
if (wp->flags & BP_CPU &&
!cc->debug_check_watchpoint(cpu, wp)) {
wp->flags &= ~BP_WATCHPOINT_HIT;
continue;
}
cpu->watchpoint_hit = wp;
/* The tb_lock will be reset when cpu_loop_exit or
* cpu_loop_exit_noexc longjmp back into the cpu_exec
* main loop.
*/
tb_lock();
tb_check_watchpoint(cpu);
if (wp->flags & BP_STOP_BEFORE_ACCESS) {
cpu->exception_index = EXCP_DEBUG;
cpu_loop_exit(cpu);
} else {
cpu_get_tb_cpu_state(env, &pc, &cs_base, &cpu_flags);
tb_gen_code(cpu, pc, cs_base, cpu_flags, 1);
cpu_loop_exit_noexc(cpu);
}
}
} else {
wp->flags &= ~BP_WATCHPOINT_HIT;
}
}
}
/* Watchpoint access routines. Watchpoints are inserted using TLB tricks,
so these check for a hit then pass through to the normal out-of-line
phys routines. */
static MemTxResult watch_mem_read(void *opaque, hwaddr addr, uint64_t *pdata,
unsigned size, MemTxAttrs attrs)
{
MemTxResult res;
uint64_t data;
int asidx = cpu_asidx_from_attrs(current_cpu, attrs);
AddressSpace *as = current_cpu->cpu_ases[asidx].as;
check_watchpoint(addr & ~TARGET_PAGE_MASK, size, attrs, BP_MEM_READ);
switch (size) {
case 1:
data = address_space_ldub(as, addr, attrs, &res);
break;
case 2:
data = address_space_lduw(as, addr, attrs, &res);
break;
case 4:
data = address_space_ldl(as, addr, attrs, &res);
break;
default: abort();
}
*pdata = data;
return res;
}
static MemTxResult watch_mem_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size,
MemTxAttrs attrs)
{
MemTxResult res;
int asidx = cpu_asidx_from_attrs(current_cpu, attrs);
AddressSpace *as = current_cpu->cpu_ases[asidx].as;
check_watchpoint(addr & ~TARGET_PAGE_MASK, size, attrs, BP_MEM_WRITE);
switch (size) {
case 1:
address_space_stb(as, addr, val, attrs, &res);
break;
case 2:
address_space_stw(as, addr, val, attrs, &res);
break;
case 4:
address_space_stl(as, addr, val, attrs, &res);
break;
default: abort();
}
return res;
}
static const MemoryRegionOps watch_mem_ops = {
.read_with_attrs = watch_mem_read,
.write_with_attrs = watch_mem_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static MemTxResult subpage_read(void *opaque, hwaddr addr, uint64_t *data,
unsigned len, MemTxAttrs attrs)
{
subpage_t *subpage = opaque;
uint8_t buf[8];
MemTxResult res;
#if defined(DEBUG_SUBPAGE)
printf("%s: subpage %p len %u addr " TARGET_FMT_plx "\n", __func__,
subpage, len, addr);
#endif
res = address_space_read(subpage->as, addr + subpage->base,
attrs, buf, len);
if (res) {
return res;
}
switch (len) {
case 1:
*data = ldub_p(buf);
return MEMTX_OK;
case 2:
*data = lduw_p(buf);
return MEMTX_OK;
case 4:
*data = ldl_p(buf);
return MEMTX_OK;
case 8:
*data = ldq_p(buf);
return MEMTX_OK;
default:
abort();
}
}
static MemTxResult subpage_write(void *opaque, hwaddr addr,
uint64_t value, unsigned len, MemTxAttrs attrs)
{
subpage_t *subpage = opaque;
uint8_t buf[8];
#if defined(DEBUG_SUBPAGE)
printf("%s: subpage %p len %u addr " TARGET_FMT_plx
" value %"PRIx64"\n",
__func__, subpage, len, addr, value);
#endif
switch (len) {
case 1:
stb_p(buf, value);
break;
case 2:
stw_p(buf, value);
break;
case 4:
stl_p(buf, value);
break;
case 8:
stq_p(buf, value);
break;
default:
abort();
}
return address_space_write(subpage->as, addr + subpage->base,
attrs, buf, len);
}
static bool subpage_accepts(void *opaque, hwaddr addr,
unsigned len, bool is_write)
{
subpage_t *subpage = opaque;
#if defined(DEBUG_SUBPAGE)
printf("%s: subpage %p %c len %u addr " TARGET_FMT_plx "\n",
__func__, subpage, is_write ? 'w' : 'r', len, addr);
#endif
return address_space_access_valid(subpage->as, addr + subpage->base,
len, is_write);
}
static const MemoryRegionOps subpage_ops = {
.read_with_attrs = subpage_read,
.write_with_attrs = 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,
};
static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
uint16_t section)
{
int idx, eidx;
if (start >= TARGET_PAGE_SIZE || end >= TARGET_PAGE_SIZE)
return -1;
idx = SUBPAGE_IDX(start);
eidx = SUBPAGE_IDX(end);
#if defined(DEBUG_SUBPAGE)
printf("%s: %p start %08x end %08x idx %08x eidx %08x section %d\n",
__func__, mmio, start, end, idx, eidx, section);
#endif
for (; idx <= eidx; idx++) {
mmio->sub_section[idx] = section;
}
return 0;
}
static subpage_t *subpage_init(AddressSpace *as, hwaddr base)
{
subpage_t *mmio;
mmio = g_malloc0(sizeof(subpage_t) + TARGET_PAGE_SIZE * sizeof(uint16_t));
mmio->as = as;
mmio->base = base;
memory_region_init_io(&mmio->iomem, NULL, &subpage_ops, mmio,
NULL, TARGET_PAGE_SIZE);
mmio->iomem.subpage = true;
#if defined(DEBUG_SUBPAGE)
printf("%s: %p base " TARGET_FMT_plx " len %08x\n", __func__,
mmio, base, TARGET_PAGE_SIZE);
#endif
subpage_register(mmio, 0, TARGET_PAGE_SIZE-1, PHYS_SECTION_UNASSIGNED);
return mmio;
}
static uint16_t dummy_section(PhysPageMap *map, AddressSpace *as,
MemoryRegion *mr)
{
assert(as);
MemoryRegionSection section = {
.address_space = as,
.mr = mr,
.offset_within_address_space = 0,
.offset_within_region = 0,
.size = int128_2_64(),
};
return phys_section_add(map, &section);
}
MemoryRegion *iotlb_to_region(CPUState *cpu, hwaddr index, MemTxAttrs attrs)
{
int asidx = cpu_asidx_from_attrs(cpu, attrs);
CPUAddressSpace *cpuas = &cpu->cpu_ases[asidx];
AddressSpaceDispatch *d = atomic_rcu_read(&cpuas->memory_dispatch);
MemoryRegionSection *sections = d->map.sections;
return sections[index & ~TARGET_PAGE_MASK].mr;
}
static void io_mem_init(void)
{
memory_region_init_io(&io_mem_rom, NULL, &unassigned_mem_ops, NULL, NULL, UINT64_MAX);
memory_region_init_io(&io_mem_unassigned, NULL, &unassigned_mem_ops, NULL,
NULL, UINT64_MAX);
memory_region_init_io(&io_mem_notdirty, NULL, &notdirty_mem_ops, NULL,
NULL, UINT64_MAX);
memory_region_init_io(&io_mem_watch, NULL, &watch_mem_ops, NULL,
NULL, UINT64_MAX);
}
static void mem_begin(MemoryListener *listener)
{
AddressSpace *as = container_of(listener, AddressSpace, dispatch_listener);
AddressSpaceDispatch *d = g_new0(AddressSpaceDispatch, 1);
uint16_t n;
n = dummy_section(&d->map, as, &io_mem_unassigned);
assert(n == PHYS_SECTION_UNASSIGNED);
n = dummy_section(&d->map, as, &io_mem_notdirty);
assert(n == PHYS_SECTION_NOTDIRTY);
n = dummy_section(&d->map, as, &io_mem_rom);
assert(n == PHYS_SECTION_ROM);
n = dummy_section(&d->map, as, &io_mem_watch);
assert(n == PHYS_SECTION_WATCH);
d->phys_map = (PhysPageEntry) { .ptr = PHYS_MAP_NODE_NIL, .skip = 1 };
d->as = as;
as->next_dispatch = d;
}
static void address_space_dispatch_free(AddressSpaceDispatch *d)
{
phys_sections_free(&d->map);
g_free(d);
}
static void mem_commit(MemoryListener *listener)
{
AddressSpace *as = container_of(listener, AddressSpace, dispatch_listener);
AddressSpaceDispatch *cur = as->dispatch;
AddressSpaceDispatch *next = as->next_dispatch;
phys_page_compact_all(next, next->map.nodes_nb);
atomic_rcu_set(&as->dispatch, next);
if (cur) {
call_rcu(cur, address_space_dispatch_free, rcu);
}
}
static void tcg_commit(MemoryListener *listener)
{
CPUAddressSpace *cpuas;
AddressSpaceDispatch *d;
/* since each CPU stores ram addresses in its TLB cache, we must
reset the modified entries */
cpuas = container_of(listener, CPUAddressSpace, tcg_as_listener);
cpu_reloading_memory_map();
/* The CPU and TLB are protected by the iothread lock.
* We reload the dispatch pointer now because cpu_reloading_memory_map()
* may have split the RCU critical section.
*/
d = atomic_rcu_read(&cpuas->as->dispatch);
atomic_rcu_set(&cpuas->memory_dispatch, d);
tlb_flush(cpuas->cpu);
}
void address_space_init_dispatch(AddressSpace *as)
{
as->dispatch = NULL;
as->dispatch_listener = (MemoryListener) {
.begin = mem_begin,
.commit = mem_commit,
.region_add = mem_add,
.region_nop = mem_add,
.priority = 0,
};
memory_listener_register(&as->dispatch_listener, as);
}
void address_space_unregister(AddressSpace *as)
{
memory_listener_unregister(&as->dispatch_listener);
}
void address_space_destroy_dispatch(AddressSpace *as)
{
AddressSpaceDispatch *d = as->dispatch;
atomic_rcu_set(&as->dispatch, NULL);
if (d) {
call_rcu(d, address_space_dispatch_free, rcu);
}
}
static void memory_map_init(void)
{
system_memory = g_malloc(sizeof(*system_memory));
memory_region_init(system_memory, NULL, "system", UINT64_MAX);
address_space_init(&address_space_memory, system_memory, "memory");
system_io = g_malloc(sizeof(*system_io));
memory_region_init_io(system_io, NULL, &unassigned_io_ops, NULL, "io",
65536);
address_space_init(&address_space_io, system_io, "I/O");
}
MemoryRegion *get_system_memory(void)
{
return system_memory;
}
MemoryRegion *get_system_io(void)
{
return system_io;
}
#endif /* !defined(CONFIG_USER_ONLY) */
/* physical memory access (slow version, mainly for debug) */
#if defined(CONFIG_USER_ONLY)
int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, int is_write)
{
int l, flags;
target_ulong page;
void * p;
while (len > 0) {
page = addr & TARGET_PAGE_MASK;
l = (page + TARGET_PAGE_SIZE) - addr;
if (l > len)
l = len;
flags = page_get_flags(page);
if (!(flags & PAGE_VALID))
return -1;
if (is_write) {
if (!(flags & PAGE_WRITE))
return -1;
/* XXX: this code should not depend on lock_user */
if (!(p = lock_user(VERIFY_WRITE, addr, l, 0)))
return -1;
memcpy(p, buf, l);
unlock_user(p, addr, l);
} else {
if (!(flags & PAGE_READ))
return -1;
/* XXX: this code should not depend on lock_user */
if (!(p = lock_user(VERIFY_READ, addr, l, 1)))
return -1;
memcpy(buf, p, l);
unlock_user(p, addr, 0);
}
len -= l;
buf += l;
addr += l;
}
return 0;
}
#else
static void invalidate_and_set_dirty(MemoryRegion *mr, hwaddr addr,
hwaddr length)
{
uint8_t dirty_log_mask = memory_region_get_dirty_log_mask(mr);
addr += memory_region_get_ram_addr(mr);
/* No early return if dirty_log_mask is or becomes 0, because
* cpu_physical_memory_set_dirty_range will still call
* xen_modified_memory.
*/
if (dirty_log_mask) {
dirty_log_mask =
cpu_physical_memory_range_includes_clean(addr, length, dirty_log_mask);
}
if (dirty_log_mask & (1 << DIRTY_MEMORY_CODE)) {
tb_lock();
tb_invalidate_phys_range(addr, addr + length);
tb_unlock();
dirty_log_mask &= ~(1 << DIRTY_MEMORY_CODE);
}
cpu_physical_memory_set_dirty_range(addr, length, dirty_log_mask);
}
static int memory_access_size(MemoryRegion *mr, unsigned l, hwaddr addr)
{
unsigned access_size_max = mr->ops->valid.max_access_size;
/* Regions are assumed to support 1-4 byte accesses unless
otherwise specified. */
if (access_size_max == 0) {
access_size_max = 4;
}
/* Bound the maximum access by the alignment of the address. */
if (!mr->ops->impl.unaligned) {
unsigned align_size_max = addr & -addr;
if (align_size_max != 0 && align_size_max < access_size_max) {
access_size_max = align_size_max;
}
}
/* Don't attempt accesses larger than the maximum. */
if (l > access_size_max) {
l = access_size_max;
}
l = pow2floor(l);
return l;
}
static bool prepare_mmio_access(MemoryRegion *mr)
{
bool unlocked = !qemu_mutex_iothread_locked();
bool release_lock = false;
if (unlocked && mr->global_locking) {
qemu_mutex_lock_iothread();
unlocked = false;
release_lock = true;
}
if (mr->flush_coalesced_mmio) {
if (unlocked) {
qemu_mutex_lock_iothread();
}
qemu_flush_coalesced_mmio_buffer();
if (unlocked) {
qemu_mutex_unlock_iothread();
}
}
return release_lock;
}
/* Called within RCU critical section. */
static MemTxResult address_space_write_continue(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs,
const uint8_t *buf,
int len, hwaddr addr1,
hwaddr l, MemoryRegion *mr)
{
uint8_t *ptr;
uint64_t val;
MemTxResult result = MEMTX_OK;
bool release_lock = false;
for (;;) {
if (!memory_access_is_direct(mr, true)) {
release_lock |= prepare_mmio_access(mr);
l = memory_access_size(mr, l, addr1);
/* XXX: could force current_cpu to NULL to avoid
potential bugs */
switch (l) {
case 8:
/* 64 bit write access */
val = ldq_p(buf);
result |= memory_region_dispatch_write(mr, addr1, val, 8,
attrs);
break;
case 4:
/* 32 bit write access */
val = (uint32_t)ldl_p(buf);
result |= memory_region_dispatch_write(mr, addr1, val, 4,
attrs);
break;
case 2:
/* 16 bit write access */
val = lduw_p(buf);
result |= memory_region_dispatch_write(mr, addr1, val, 2,
attrs);
break;
case 1:
/* 8 bit write access */
val = ldub_p(buf);
result |= memory_region_dispatch_write(mr, addr1, val, 1,
attrs);
break;
default:
abort();
}
} else {
/* RAM case */
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
memcpy(ptr, buf, l);
invalidate_and_set_dirty(mr, addr1, l);
}
if (release_lock) {
qemu_mutex_unlock_iothread();
release_lock = false;
}
len -= l;
buf += l;
addr += l;
if (!len) {
break;
}
l = len;
mr = address_space_translate(as, addr, &addr1, &l, true);
}
return result;
}
MemTxResult address_space_write(AddressSpace *as, hwaddr addr, MemTxAttrs attrs,
const uint8_t *buf, int len)
{
hwaddr l;
hwaddr addr1;
MemoryRegion *mr;
MemTxResult result = MEMTX_OK;
if (len > 0) {
rcu_read_lock();
l = len;
mr = address_space_translate(as, addr, &addr1, &l, true);
result = address_space_write_continue(as, addr, attrs, buf, len,
addr1, l, mr);
rcu_read_unlock();
}
return result;
}
/* Called within RCU critical section. */
MemTxResult address_space_read_continue(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, uint8_t *buf,
int len, hwaddr addr1, hwaddr l,
MemoryRegion *mr)
{
uint8_t *ptr;
uint64_t val;
MemTxResult result = MEMTX_OK;
bool release_lock = false;
for (;;) {
if (!memory_access_is_direct(mr, false)) {
/* I/O case */
release_lock |= prepare_mmio_access(mr);
l = memory_access_size(mr, l, addr1);
switch (l) {
case 8:
/* 64 bit read access */
result |= memory_region_dispatch_read(mr, addr1, &val, 8,
attrs);
stq_p(buf, val);
break;
case 4:
/* 32 bit read access */
result |= memory_region_dispatch_read(mr, addr1, &val, 4,
attrs);
stl_p(buf, val);
break;
case 2:
/* 16 bit read access */
result |= memory_region_dispatch_read(mr, addr1, &val, 2,
attrs);
stw_p(buf, val);
break;
case 1:
/* 8 bit read access */
result |= memory_region_dispatch_read(mr, addr1, &val, 1,
attrs);
stb_p(buf, val);
break;
default:
abort();
}
} else {
/* RAM case */
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
memcpy(buf, ptr, l);
}
if (release_lock) {
qemu_mutex_unlock_iothread();
release_lock = false;
}
len -= l;
buf += l;
addr += l;
if (!len) {
break;
}
l = len;
mr = address_space_translate(as, addr, &addr1, &l, false);
}
return result;
}
MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, uint8_t *buf, int len)
{
hwaddr l;
hwaddr addr1;
MemoryRegion *mr;
MemTxResult result = MEMTX_OK;
if (len > 0) {
rcu_read_lock();
l = len;
mr = address_space_translate(as, addr, &addr1, &l, false);
result = address_space_read_continue(as, addr, attrs, buf, len,
addr1, l, mr);
rcu_read_unlock();
}
return result;
}
MemTxResult address_space_rw(AddressSpace *as, hwaddr addr, MemTxAttrs attrs,
uint8_t *buf, int len, bool is_write)
{
if (is_write) {
return address_space_write(as, addr, attrs, (uint8_t *)buf, len);
} else {
return address_space_read(as, addr, attrs, (uint8_t *)buf, len);
}
}
void cpu_physical_memory_rw(hwaddr addr, uint8_t *buf,
int len, int is_write)
{
address_space_rw(&address_space_memory, addr, MEMTXATTRS_UNSPECIFIED,
buf, len, is_write);
}
enum write_rom_type {
WRITE_DATA,
FLUSH_CACHE,
};
static inline void cpu_physical_memory_write_rom_internal(AddressSpace *as,
hwaddr addr, const uint8_t *buf, int len, enum write_rom_type type)
{
hwaddr l;
uint8_t *ptr;
hwaddr addr1;
MemoryRegion *mr;
rcu_read_lock();
while (len > 0) {
l = len;
mr = address_space_translate(as, addr, &addr1, &l, true);
if (!(memory_region_is_ram(mr) ||
memory_region_is_romd(mr))) {
l = memory_access_size(mr, l, addr1);
} else {
/* ROM/RAM case */
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
switch (type) {
case WRITE_DATA:
memcpy(ptr, buf, l);
invalidate_and_set_dirty(mr, addr1, l);
break;
case FLUSH_CACHE:
flush_icache_range((uintptr_t)ptr, (uintptr_t)ptr + l);
break;
}
}
len -= l;
buf += l;
addr += l;
}
rcu_read_unlock();
}
/* used for ROM loading : can write in RAM and ROM */
void cpu_physical_memory_write_rom(AddressSpace *as, hwaddr addr,
const uint8_t *buf, int len)
{
cpu_physical_memory_write_rom_internal(as, addr, buf, len, WRITE_DATA);
}
void cpu_flush_icache_range(hwaddr start, int len)
{
/*
* This function should do the same thing as an icache flush that was
* triggered from within the guest. For TCG we are always cache coherent,
* so there is no need to flush anything. For KVM / Xen we need to flush
* the host's instruction cache at least.
*/
if (tcg_enabled()) {
return;
}
cpu_physical_memory_write_rom_internal(&address_space_memory,
start, NULL, len, FLUSH_CACHE);
}
typedef struct {
MemoryRegion *mr;
void *buffer;
hwaddr addr;
hwaddr len;
bool in_use;
} BounceBuffer;
static BounceBuffer bounce;
typedef struct MapClient {
QEMUBH *bh;
QLIST_ENTRY(MapClient) link;
} MapClient;
QemuMutex map_client_list_lock;
static QLIST_HEAD(map_client_list, MapClient) map_client_list
= QLIST_HEAD_INITIALIZER(map_client_list);
static void cpu_unregister_map_client_do(MapClient *client)
{
QLIST_REMOVE(client, link);
g_free(client);
}
static void cpu_notify_map_clients_locked(void)
{
MapClient *client;
while (!QLIST_EMPTY(&map_client_list)) {
client = QLIST_FIRST(&map_client_list);
qemu_bh_schedule(client->bh);
cpu_unregister_map_client_do(client);
}
}
void cpu_register_map_client(QEMUBH *bh)
{
MapClient *client = g_malloc(sizeof(*client));
qemu_mutex_lock(&map_client_list_lock);
client->bh = bh;
QLIST_INSERT_HEAD(&map_client_list, client, link);
if (!atomic_read(&bounce.in_use)) {
cpu_notify_map_clients_locked();
}
qemu_mutex_unlock(&map_client_list_lock);
}
void cpu_exec_init_all(void)
{
qemu_mutex_init(&ram_list.mutex);
/* The data structures we set up here depend on knowing the page size,
* so no more changes can be made after this point.
* In an ideal world, nothing we did before we had finished the
* machine setup would care about the target page size, and we could
* do this much later, rather than requiring board models to state
* up front what their requirements are.
*/
finalize_target_page_bits();
io_mem_init();
memory_map_init();
qemu_mutex_init(&map_client_list_lock);
}
void cpu_unregister_map_client(QEMUBH *bh)
{
MapClient *client;
qemu_mutex_lock(&map_client_list_lock);
QLIST_FOREACH(client, &map_client_list, link) {
if (client->bh == bh) {
cpu_unregister_map_client_do(client);
break;
}
}
qemu_mutex_unlock(&map_client_list_lock);
}
static void cpu_notify_map_clients(void)
{
qemu_mutex_lock(&map_client_list_lock);
cpu_notify_map_clients_locked();
qemu_mutex_unlock(&map_client_list_lock);
}
bool address_space_access_valid(AddressSpace *as, hwaddr addr, int len, bool is_write)
{
MemoryRegion *mr;
hwaddr l, xlat;
rcu_read_lock();
while (len > 0) {
l = len;
mr = address_space_translate(as, addr, &xlat, &l, is_write);
if (!memory_access_is_direct(mr, is_write)) {
l = memory_access_size(mr, l, addr);
if (!memory_region_access_valid(mr, xlat, l, is_write)) {
rcu_read_unlock();
return false;
}
}
len -= l;
addr += l;
}
rcu_read_unlock();
return true;
}
static hwaddr
address_space_extend_translation(AddressSpace *as, hwaddr addr, hwaddr target_len,
MemoryRegion *mr, hwaddr base, hwaddr len,
bool is_write)
{
hwaddr done = 0;
hwaddr xlat;
MemoryRegion *this_mr;
for (;;) {
target_len -= len;
addr += len;
done += len;
if (target_len == 0) {
return done;
}
len = target_len;
this_mr = address_space_translate(as, addr, &xlat, &len, is_write);
if (this_mr != mr || xlat != base + done) {
return done;
}
}
}
/* Map a physical memory region into a host virtual address.
* May map a subset of the requested range, given by and returned in *plen.
* May return NULL if resources needed to perform the mapping are exhausted.
* Use only for reads OR writes - not for read-modify-write operations.
* Use cpu_register_map_client() to know when retrying the map operation is
* likely to succeed.
*/
void *address_space_map(AddressSpace *as,
hwaddr addr,
hwaddr *plen,
bool is_write)
{
hwaddr len = *plen;
hwaddr l, xlat;
MemoryRegion *mr;
void *ptr;
if (len == 0) {
return NULL;
}
l = len;
rcu_read_lock();
mr = address_space_translate(as, addr, &xlat, &l, is_write);
if (!memory_access_is_direct(mr, is_write)) {
if (atomic_xchg(&bounce.in_use, true)) {
rcu_read_unlock();
return NULL;
}
/* Avoid unbounded allocations */
l = MIN(l, TARGET_PAGE_SIZE);
bounce.buffer = qemu_memalign(TARGET_PAGE_SIZE, l);
bounce.addr = addr;
bounce.len = l;
memory_region_ref(mr);
bounce.mr = mr;
if (!is_write) {
address_space_read(as, addr, MEMTXATTRS_UNSPECIFIED,
bounce.buffer, l);
}
rcu_read_unlock();
*plen = l;
return bounce.buffer;
}
memory_region_ref(mr);
*plen = address_space_extend_translation(as, addr, len, mr, xlat, l, is_write);
ptr = qemu_ram_ptr_length(mr->ram_block, xlat, plen);
rcu_read_unlock();
return ptr;
}
/* Unmaps a memory region previously mapped by address_space_map().
* Will also mark the memory as dirty if is_write == 1. access_len gives
* the amount of memory that was actually read or written by the caller.
*/
void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
int is_write, hwaddr access_len)
{
if (buffer != bounce.buffer) {
MemoryRegion *mr;
ram_addr_t addr1;
mr = memory_region_from_host(buffer, &addr1);
assert(mr != NULL);
if (is_write) {
invalidate_and_set_dirty(mr, addr1, access_len);
}
if (xen_enabled()) {
xen_invalidate_map_cache_entry(buffer);
}
memory_region_unref(mr);
return;
}
if (is_write) {
address_space_write(as, bounce.addr, MEMTXATTRS_UNSPECIFIED,
bounce.buffer, access_len);
}
qemu_vfree(bounce.buffer);
bounce.buffer = NULL;
memory_region_unref(bounce.mr);
atomic_mb_set(&bounce.in_use, false);
cpu_notify_map_clients();
}
void *cpu_physical_memory_map(hwaddr addr,
hwaddr *plen,
int is_write)
{
return address_space_map(&address_space_memory, addr, plen, is_write);
}
void cpu_physical_memory_unmap(void *buffer, hwaddr len,
int is_write, hwaddr access_len)
{
return address_space_unmap(&address_space_memory, buffer, len, is_write, access_len);
}
#define ARG1_DECL AddressSpace *as
#define ARG1 as
#define SUFFIX
#define TRANSLATE(...) address_space_translate(as, __VA_ARGS__)
#define IS_DIRECT(mr, is_write) memory_access_is_direct(mr, is_write)
#define MAP_RAM(mr, ofs) qemu_map_ram_ptr((mr)->ram_block, ofs)
#define INVALIDATE(mr, ofs, len) invalidate_and_set_dirty(mr, ofs, len)
#define RCU_READ_LOCK(...) rcu_read_lock()
#define RCU_READ_UNLOCK(...) rcu_read_unlock()
#include "memory_ldst.inc.c"
int64_t address_space_cache_init(MemoryRegionCache *cache,
AddressSpace *as,
hwaddr addr,
hwaddr len,
bool is_write)
{
hwaddr l, xlat;
MemoryRegion *mr;
void *ptr;
assert(len > 0);
l = len;
mr = address_space_translate(as, addr, &xlat, &l, is_write);
if (!memory_access_is_direct(mr, is_write)) {
return -EINVAL;
}
l = address_space_extend_translation(as, addr, len, mr, xlat, l, is_write);
ptr = qemu_ram_ptr_length(mr->ram_block, xlat, &l);
cache->xlat = xlat;
cache->is_write = is_write;
cache->mr = mr;
cache->ptr = ptr;
cache->len = l;
memory_region_ref(cache->mr);
return l;
}
void address_space_cache_invalidate(MemoryRegionCache *cache,
hwaddr addr,
hwaddr access_len)
{
assert(cache->is_write);
invalidate_and_set_dirty(cache->mr, addr + cache->xlat, access_len);
}
void address_space_cache_destroy(MemoryRegionCache *cache)
{
if (!cache->mr) {
return;
}
if (xen_enabled()) {
xen_invalidate_map_cache_entry(cache->ptr);
}
memory_region_unref(cache->mr);
cache->mr = NULL;
}
/* Called from RCU critical section. This function has the same
* semantics as address_space_translate, but it only works on a
* predefined range of a MemoryRegion that was mapped with
* address_space_cache_init.
*/
static inline MemoryRegion *address_space_translate_cached(
MemoryRegionCache *cache, hwaddr addr, hwaddr *xlat,
hwaddr *plen, bool is_write)
{
assert(addr < cache->len && *plen <= cache->len - addr);
*xlat = addr + cache->xlat;
return cache->mr;
}
#define ARG1_DECL MemoryRegionCache *cache
#define ARG1 cache
#define SUFFIX _cached
#define TRANSLATE(...) address_space_translate_cached(cache, __VA_ARGS__)
#define IS_DIRECT(mr, is_write) true
#define MAP_RAM(mr, ofs) (cache->ptr + (ofs - cache->xlat))
#define INVALIDATE(mr, ofs, len) ((void)0)
#define RCU_READ_LOCK() ((void)0)
#define RCU_READ_UNLOCK() ((void)0)
#include "memory_ldst.inc.c"
/* virtual memory access for debug (includes writing to ROM) */
int cpu_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, int is_write)
{
int l;
hwaddr phys_addr;
target_ulong page;
while (len > 0) {
int asidx;
MemTxAttrs attrs;
page = addr & TARGET_PAGE_MASK;
phys_addr = cpu_get_phys_page_attrs_debug(cpu, page, &attrs);
asidx = cpu_asidx_from_attrs(cpu, attrs);
/* if no physical page mapped, return an error */
if (phys_addr == -1)
return -1;
l = (page + TARGET_PAGE_SIZE) - addr;
if (l > len)
l = len;
phys_addr += (addr & ~TARGET_PAGE_MASK);
if (is_write) {
cpu_physical_memory_write_rom(cpu->cpu_ases[asidx].as,
phys_addr, buf, l);
} else {
address_space_rw(cpu->cpu_ases[asidx].as, phys_addr,
MEMTXATTRS_UNSPECIFIED,
buf, l, 0);
}
len -= l;
buf += l;
addr += l;
}
return 0;
}
/*
* Allows code that needs to deal with migration bitmaps etc to still be built
* target independent.
*/
size_t qemu_target_page_bits(void)
{
return TARGET_PAGE_BITS;
}
#endif
/*
* A helper function for the _utterly broken_ virtio device model to find out if
* it's running on a big endian machine. Don't do this at home kids!
*/
bool target_words_bigendian(void);
bool target_words_bigendian(void)
{
#if defined(TARGET_WORDS_BIGENDIAN)
return true;
#else
return false;
#endif
}
#ifndef CONFIG_USER_ONLY
bool cpu_physical_memory_is_io(hwaddr phys_addr)
{
MemoryRegion*mr;
hwaddr l = 1;
bool res;
rcu_read_lock();
mr = address_space_translate(&address_space_memory,
phys_addr, &phys_addr, &l, false);
res = !(memory_region_is_ram(mr) || memory_region_is_romd(mr));
rcu_read_unlock();
return res;
}
int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque)
{
RAMBlock *block;
int ret = 0;
rcu_read_lock();
QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
ret = func(block->idstr, block->host, block->offset,
block->used_length, opaque);
if (ret) {
break;
}
}
rcu_read_unlock();
return ret;
}
#endif
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