blob: 2e3e131992a84ed1629f23a34b46f5c4bf1006bb [file] [log] [blame]
/*
* 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"
#include "qemu/abort.h"
#include "qemu/cutils.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/target_page.h"
#include "tcg.h"
#include "hw/qdev-core.h"
#include "hw/qdev-properties.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/memory-remap.h"
#include "exec/ioport.h"
#include "sysemu/dma.h"
#include "sysemu/numa.h"
#include "sysemu/hw_accel.h"
#include "exec/address-spaces.h"
#include "sysemu/xen-mapcache.h"
#include "trace-root.h"
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
#include <linux/falloc.h>
#endif
#endif
#include "qemu/rcu_queue.h"
#include "qemu/main-loop.h"
#include "accel/tcg/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"
#include "qemu/mmap-alloc.h"
#include "monitor/monitor.h"
//#define DEBUG_SUBPAGE
#define FLATVIEW_UNUSUAL_ITER_COUNT 128
#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;
static bool ram_blocks_exiting = false;
/* 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)
/* RAM is a mapped file */
#define RAM_MAPPED (1 << 3)
/* RAM backing is managed by user */
#define RAM_USER_BACKED (1 << 4)
/* UFFDIO_ZEROPAGE is available on this RAMBlock to atomically
* zero the page and wake waiting processes.
* (Set during postcopy)
*/
#define RAM_UF_ZEROPAGE (1 << 3)
#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;
uintptr_t qemu_host_page_size;
intptr_t qemu_host_page_mask;
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 {
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;
};
#define SUBPAGE_IDX(addr) ((addr) & ~TARGET_PAGE_MASK)
typedef struct subpage_t {
MemoryRegion iomem;
FlatView *fv;
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;
};
struct DirtyBitmapSnapshot {
ram_addr_t start;
ram_addr_t end;
unsigned long dirty[];
};
#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;
}
}
void address_space_dispatch_compact(AddressSpaceDispatch *d)
{
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(AddressSpaceDispatch *d, hwaddr addr)
{
PhysPageEntry lp = d->phys_map, *p;
Node *nodes = d->map.nodes;
MemoryRegionSection *sections = d->map.sections;
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;
if (!section || section == &d->map.sections[PHYS_SECTION_UNASSIGNED] ||
!section_covers_addr(section, addr)) {
section = phys_page_find(d, addr);
atomic_set(&d->mru_section, section);
}
if (resolve_subpage && section->mr->subpage) {
subpage = container_of(section->mr, subpage_t, iomem);
section = &d->map.sections[subpage->sub_section[SUBPAGE_IDX(addr)]];
}
return section;
}
/* 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;
}
static const char* memory_region_get_name_safe(MemoryRegion* mr) {
if (!mr) {
return "(null region)";
}
if (!mr->name) {
return "(none)";
}
return mr->name;
}
static void flatview_spin_warning(
const char* label,
uint32_t iters,
hwaddr first_addr,
hwaddr addr,
MemoryRegion* first_mr,
MemoryRegion* mr) {
qemu_spin_warning(
iters, FLATVIEW_UNUSUAL_ITER_COUNT,
"Warning: %s has iterated %u times. "
"First addr: 0x%llx. Last addr: 0x%llx. "
"First mr: %p (%s). Last mr: %p (%s)\n",
label,
iters,
(unsigned long long)first_addr,
(unsigned long long)addr,
first_mr, memory_region_get_name_safe(first_mr),
mr, memory_region_get_name_safe(mr));
}
/**
* address_space_translate_iommu - translate an address through an IOMMU
* memory region and then through the target address space.
*
* @iommu_mr: the IOMMU memory region that we start the translation from
* @addr: the address to be translated through the MMU
* @xlat: the translated address offset within the destination memory region.
* It cannot be %NULL.
* @plen_out: valid read/write length of the translated address. It
* cannot be %NULL.
* @page_mask_out: page mask for the translated address. This
* should only be meaningful for IOMMU translated
* addresses, since there may be huge pages that this bit
* would tell. It can be %NULL if we don't care about it.
* @is_write: whether the translation operation is for write
* @is_mmio: whether this can be MMIO, set true if it can
* @target_as: the address space targeted by the IOMMU
*
* This function is called from RCU critical section. It is the common
* part of flatview_do_translate and address_space_translate_cached.
*/
static MemoryRegionSection address_space_translate_iommu(IOMMUMemoryRegion *iommu_mr,
hwaddr *xlat,
hwaddr *plen_out,
hwaddr *page_mask_out,
bool is_write,
bool is_mmio,
AddressSpace **target_as)
{
MemoryRegionSection *section;
hwaddr page_mask = (hwaddr)-1;
uint32_t iters = 0;
hwaddr first_addr = *xlat;
do {
hwaddr addr = *xlat;
++iters;
flatview_spin_warning(
"address_space_translate_iommu",
iters,
first_addr, addr,
NULL, section ? section->mr : NULL);
IOMMUMemoryRegionClass *imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
IOMMUTLBEntry iotlb = imrc->translate(iommu_mr, addr, is_write ?
IOMMU_WO : IOMMU_RO);
if (!(iotlb.perm & (1 << is_write))) {
goto unassigned;
}
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
page_mask &= iotlb.addr_mask;
*plen_out = MIN(*plen_out, (addr | iotlb.addr_mask) - addr + 1);
*target_as = iotlb.target_as;
section = address_space_translate_internal(
address_space_to_dispatch(iotlb.target_as), addr, xlat,
plen_out, is_mmio);
iommu_mr = memory_region_get_iommu(section->mr);
} while (unlikely(iommu_mr));
if (page_mask_out) {
*page_mask_out = page_mask;
}
return *section;
unassigned:
return (MemoryRegionSection) { .mr = &io_mem_unassigned };
}
/**
* flatview_do_translate - translate an address in FlatView
*
* @fv: the flat view that we want to translate on
* @addr: the address to be translated in above address space
* @xlat: the translated address offset within memory region. It
* cannot be @NULL.
* @plen_out: valid read/write length of the translated address. It
* can be @NULL when we don't care about it.
* @page_mask_out: page mask for the translated address. This
* should only be meaningful for IOMMU translated
* addresses, since there may be huge pages that this bit
* would tell. It can be @NULL if we don't care about it.
* @is_write: whether the translation operation is for write
* @is_mmio: whether this can be MMIO, set true if it can
*
* This function is called from RCU critical section
*/
static MemoryRegionSection flatview_do_translate(FlatView *fv,
hwaddr addr,
hwaddr *xlat,
hwaddr *plen_out,
hwaddr *page_mask_out,
bool is_write,
bool is_mmio,
AddressSpace **target_as)
{
MemoryRegionSection *section = NULL;
IOMMUMemoryRegion *iommu_mr;
hwaddr plen = (hwaddr)(-1);
if (!plen_out) {
plen_out = &plen;
}
section = address_space_translate_internal(
flatview_to_dispatch(fv), addr, xlat,
plen_out, is_mmio);
iommu_mr = memory_region_get_iommu(section->mr);
if (unlikely(iommu_mr)) {
return address_space_translate_iommu(iommu_mr, xlat,
plen_out, page_mask_out,
is_write, is_mmio,
target_as);
}
if (page_mask_out) {
/* Not behind an IOMMU, use default page size. */
*page_mask_out = ~TARGET_PAGE_MASK;
}
return *section;
}
/* Called from RCU critical section */
IOMMUTLBEntry address_space_get_iotlb_entry(AddressSpace *as, hwaddr addr,
bool is_write)
{
MemoryRegionSection section;
hwaddr xlat, page_mask;
/*
* This can never be MMIO, and we don't really care about plen,
* but page mask.
*/
section = flatview_do_translate(address_space_to_flatview(as), addr, &xlat,
NULL, &page_mask, is_write, false, &as);
/* Illegal translation */
if (section.mr == &io_mem_unassigned) {
goto iotlb_fail;
}
/* Convert memory region offset into address space offset */
xlat += section.offset_within_address_space -
section.offset_within_region;
return (IOMMUTLBEntry) {
.target_as = as,
.iova = addr & ~page_mask,
.translated_addr = xlat & ~page_mask,
.addr_mask = page_mask,
/* IOTLBs are for DMAs, and DMA only allows on RAMs. */
.perm = IOMMU_RW,
};
iotlb_fail:
return (IOMMUTLBEntry) {0};
}
/* Called from RCU critical section */
MemoryRegion *flatview_translate(FlatView *fv, hwaddr addr, hwaddr *xlat,
hwaddr *plen, bool is_write)
{
MemoryRegion *mr;
MemoryRegionSection section;
AddressSpace *as = NULL;
/* This can be MMIO, so setup MMIO bit. */
section = flatview_do_translate(fv, addr, xlat, plen, NULL,
is_write, true, &as);
mr = section.mr;
if (xen_enabled() && memory_access_is_direct(mr, is_write)) {
hwaddr page = ((addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE) - addr;
*plen = MIN(page, *plen);
}
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(!memory_region_is_iommu(section->mr));
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);
/* loadvm has just updated the content of RAM, bypassing the
* usual mechanisms that ensure we flush TBs for writes to
* memory we've translated code from. So we must flush all TBs,
* which will now be stale.
*/
tb_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, int asidx,
const char *prefix, MemoryRegion *mr)
{
CPUAddressSpace *newas;
AddressSpace *as = g_new0(AddressSpace, 1);
char *as_name;
assert(mr);
as_name = g_strdup_printf("%s-%d", prefix, cpu->cpu_index);
address_space_init(as, mr, as_name);
g_free(as_name);
/* 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);
}
}
Property cpu_common_props[] = {
#ifndef CONFIG_USER_ONLY
/* Create a memory property for softmmu CPU object,
* 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.
*/
DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
MemoryRegion *),
#endif
DEFINE_PROP_END_OF_LIST(),
};
void cpu_exec_initfn(CPUState *cpu)
{
cpu->as = NULL;
cpu->num_ases = 0;
#ifndef CONFIG_USER_ONLY
cpu->thread_id = qemu_get_thread_id();
cpu->memory = system_memory;
object_ref(OBJECT(cpu->memory));
#endif
}
void cpu_exec_realizefn(CPUState *cpu, Error **errp)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
static bool tcg_target_initialized;
cpu_list_add(cpu);
if (tcg_enabled() && !tcg_target_initialized) {
tcg_target_initialized = true;
cc->tcg_initialize();
}
#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
}
const char *parse_cpu_model(const char *cpu_model)
{
ObjectClass *oc;
CPUClass *cc;
gchar **model_pieces;
const char *cpu_type;
model_pieces = g_strsplit(cpu_model, ",", 2);
oc = cpu_class_by_name(CPU_RESOLVING_TYPE, model_pieces[0]);
if (oc == NULL) {
error_report("unable to find CPU model '%s'", model_pieces[0]);
g_strfreev(model_pieces);
exit(EXIT_FAILURE);
}
cpu_type = object_class_get_name(oc);
cc = CPU_CLASS(oc);
cc->parse_features(cpu_type, model_pieces[1], &error_fatal);
g_strfreev(model_pieces);
return cpu_type;
}
#if defined(CONFIG_USER_ONLY)
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
{
mmap_lock();
tb_lock();
tb_invalidate_phys_page_range(pc, pc + 1, 0);
tb_unlock();
mmap_unlock();
}
#else
static void breakpoint_invalidate(CPUState *cpu, target_ulong pc)
{
MemTxAttrs attrs;
hwaddr phys = cpu_get_phys_page_attrs_debug(cpu, pc, &attrs);
int asidx = cpu_asidx_from_attrs(cpu, attrs);
if (phys != -1) {
/* Locks grabbed by tb_invalidate_phys_addr */
tb_invalidate_phys_addr(cpu->cpu_ases[asidx].as,
phys | (pc & ~TARGET_PAGE_MASK));
}
}
#endif
#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->vaddress = 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->vaddress && 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->vaddress);
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->vaddress + wp->len - 1;
vaddr addrend = addr + len - 1;
return !(addr > wpend || wp->vaddress > 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;
}
RAMBLOCK_FOREACH(block) {
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));
(void)end;
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;
}
DirtyBitmapSnapshot *cpu_physical_memory_snapshot_and_clear_dirty
(ram_addr_t start, ram_addr_t length, unsigned client)
{
DirtyMemoryBlocks *blocks;
unsigned long align = 1UL << (TARGET_PAGE_BITS + BITS_PER_LEVEL);
ram_addr_t first = QEMU_ALIGN_DOWN(start, align);
ram_addr_t last = QEMU_ALIGN_UP(start + length, align);
DirtyBitmapSnapshot *snap;
unsigned long page, end, dest;
snap = g_malloc0(sizeof(*snap) +
((last - first) >> (TARGET_PAGE_BITS + 3)));
snap->start = first;
snap->end = last;
page = first >> TARGET_PAGE_BITS;
end = last >> TARGET_PAGE_BITS;
dest = 0;
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);
assert(QEMU_IS_ALIGNED(offset, (1 << BITS_PER_LEVEL)));
assert(QEMU_IS_ALIGNED(num, (1 << BITS_PER_LEVEL)));
offset >>= BITS_PER_LEVEL;
bitmap_copy_and_clear_atomic(snap->dirty + dest,
blocks->blocks[idx] + offset,
num);
page += num;
dest += num >> BITS_PER_LEVEL;
}
rcu_read_unlock();
if (tcg_enabled()) {
tlb_reset_dirty_range_all(start, length);
}
return snap;
}
bool cpu_physical_memory_snapshot_get_dirty(DirtyBitmapSnapshot *snap,
ram_addr_t start,
ram_addr_t length)
{
unsigned long page, end;
assert(start >= snap->start);
assert(start + length <= snap->end);
end = TARGET_PAGE_ALIGN(start + length - snap->start) >> TARGET_PAGE_BITS;
page = (start - snap->start) >> TARGET_PAGE_BITS;
while (page < end) {
if (test_bit(page, snap->dirty)) {
return true;
}
page++;
}
return false;
}
/* 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 = flatview_to_dispatch(section->fv);
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(FlatView *fv, hwaddr base);
static void *(*phys_mem_alloc)(size_t size, uint64_t *align, bool shared) =
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, bool shared))
{
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(FlatView *fv, MemoryRegionSection *section)
{
AddressSpaceDispatch *d = flatview_to_dispatch(fv);
subpage_t *subpage;
hwaddr base = section->offset_within_address_space
& TARGET_PAGE_MASK;
MemoryRegionSection *existing = phys_page_find(d, base);
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(fv, base);
subsection.fv = fv;
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(FlatView *fv,
MemoryRegionSection *section)
{
AddressSpaceDispatch *d = flatview_to_dispatch(fv);
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);
}
void flatview_add_to_dispatch(struct FlatView *fv, MemoryRegionSection *section)
{
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(fv, &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(fv, &now);
} else if (remain.offset_within_address_space & ~TARGET_PAGE_MASK) {
now.size = page_size;
register_subpage(fv, &now);
} else {
now.size = int128_and(now.size, int128_neg(page_size));
register_multipage(fv, &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);
}
void ram_block_dump(Monitor *mon)
{
RAMBlock *block;
char *psize;
rcu_read_lock();
monitor_printf(mon, "%24s %8s %18s %18s %18s\n",
"Block Name", "PSize", "Offset", "Used", "Total");
RAMBLOCK_FOREACH(block) {
psize = size_to_str(block->page_size);
monitor_printf(mon, "%24s %8s 0x%016" PRIx64 " 0x%016" PRIx64
" 0x%016" PRIx64 "\n", block->idstr, psize,
(uint64_t)block->offset,
(uint64_t)block->used_length,
(uint64_t)block->max_length);
g_free(psize);
}
rcu_read_unlock();
}
#ifdef __linux__
/*
* FIXME TOCTTOU: this iterates over memory backends' mem-path, which
* may or may not name the same files / on the same filesystem now as
* when we actually open and map them. Iterate over the file
* descriptors instead, and use qemu_fd_getpagesize().
*/
static int find_max_supported_pagesize(Object *obj, void *opaque)
{
char *mem_path;
long *hpsize_min = opaque;
if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
mem_path = object_property_get_str(obj, "mem-path", NULL);
if (mem_path) {
long hpsize = qemu_mempath_getpagesize(mem_path);
g_free(mem_path);
if (hpsize < *hpsize_min) {
*hpsize_min = hpsize;
}
} else {
*hpsize_min = getpagesize();
}
}
return 0;
}
long qemu_getrampagesize(void)
{
long hpsize = LONG_MAX;
long mainrampagesize;
Object *memdev_root;
if (mem_path) {
mainrampagesize = qemu_mempath_getpagesize(mem_path);
} else {
mainrampagesize = getpagesize();
}
/* it's possible we have memory-backend objects with
* hugepage-backed RAM. these may get mapped into system
* address space via -numa parameters or memory hotplug
* hooks. we want to take these into account, but we
* also want to make sure these supported hugepage
* sizes are applicable across the entire range of memory
* we may boot from, so we take the min across all
* backends, and assume normal pages in cases where a
* backend isn't backed by hugepages.
*/
memdev_root = object_resolve_path("/objects", NULL);
if (memdev_root) {
object_child_foreach(memdev_root, find_max_supported_pagesize, &hpsize);
}
if (hpsize == LONG_MAX) {
/* No additional memory regions found ==> Report main RAM page size */
return mainrampagesize;
}
/* If NUMA is disabled or the NUMA nodes are not backed with a
* memory-backend, then there is at least one node using "normal" RAM,
* so if its page size is smaller we have got to report that size instead.
*/
if (hpsize > mainrampagesize &&
(nb_numa_nodes == 0 || numa_info[0].node_memdev == NULL)) {
static bool warned;
if (!warned) {
error_report("Huge page support disabled (n/a for main memory).");
warned = true;
}
return mainrampagesize;
}
return hpsize;
}
#else
long qemu_getrampagesize(void)
{
return getpagesize();
}
#endif
static int64_t get_file_size(int fd)
{
int64_t size = lseek(fd, 0, SEEK_END);
if (size < 0) {
return -errno;
}
return size;
}
static int try_open_existing_ram_file(const char* path) {
int fd = -1;
// If an existing file is 4GB, Windows open() by itself fails.
// So use CreateFile() instead.
#ifdef _WIN32
HANDLE fh =
win32CreateFile(
path,
// Must be both, or we cannot CreateFileMapping with PAGE_READWRITE
GENERIC_READ | GENERIC_WRITE,
// Need both read and write sharing to enable multiple instances.
// Even though we will not really be writing to the RAM file with
// multiple instances, the file needs to be opened to allow us to
// proceed.
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
// Need to fail on file-not-found to follow the same path as QEMU
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
fd = _open_osfhandle((intptr_t)fh, _O_RDWR);
#else
fd = open(path, O_RDWR);
#endif
return fd;
}
static int file_ram_open(const char *path,
const char *region_name,
bool *created,
Error **errp)
{
char *filename;
char *sanitized_name;
char *c;
int fd = -1;
*created = false;
for (;;) {
fd = try_open_existing_ram_file(path);
if (fd >= 0) {
/* @path names an existing file, use it */
break;
}
#ifdef _WIN32
// CreateFile on a nonexistent file in Windows returns EBADF.
if (errno == ENOENT || errno == EBADF) {
#else
if (errno == ENOENT) {
#endif
/* @path names a file that doesn't exist, create it */
fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0644);
if (fd >= 0) {
*created = 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(region_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) {
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);
return -1;
}
/*
* Try again on EINTR and EEXIST. The latter happens when
* something else creates the file between our two open().
*/
}
return fd;
}
static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
int fd,
bool truncate,
Error **errp)
{
void *area;
block->page_size = qemu_fd_getpagesize(fd);
if (block->mr->align % block->page_size) {
error_setg(errp, "alignment 0x%" PRIx64
" must be multiples of page size 0x%zx",
block->mr->align, block->page_size);
return NULL;
}
block->mr->align = MAX(block->page_size, block->mr->align);
#if defined(__s390x__)
if (kvm_enabled()) {
block->mr->align = MAX(block->mr->align, QEMU_VMALLOC_ALIGN);
}
#endif
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);
return NULL;
}
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 (truncate && 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");
return NULL;
}
if (mem_prealloc) {
os_mem_prealloc(fd, area, memory, smp_cpus, errp);
if (errp && *errp) {
qemu_ram_munmap(area, memory);
return NULL;
}
}
block->fd = fd;
block->mapped_size = memory;
return area;
}
/* Allocate space within the ram_addr_t space that governs the
* dirty bitmaps.
* 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;
}
RAMBLOCK_FOREACH(block) {
ram_addr_t candidate, next = RAM_ADDR_MAX;
/* Align blocks to start on a 'long' in the bitmap
* which makes the bitmap sync'ing take the fast path.
*/
candidate = block->offset + block->max_length;
candidate = ROUND_UP(candidate, BITS_PER_LONG << TARGET_PAGE_BITS);
/* Search for the closest following block
* and find the gap.
*/
RAMBLOCK_FOREACH(next_block) {
if (next_block->offset >= candidate) {
next = MIN(next, next_block->offset);
}
}
/* If it fits remember our place and remember the size
* of gap, but keep going so that we might find a smaller
* gap to fill so avoiding fragmentation.
*/
if (next - candidate >= size && next - candidate < mingap) {
offset = candidate;
mingap = next - candidate;
}
trace_find_ram_offset_loop(size, candidate, offset, next, mingap);
}
if (offset == RAM_ADDR_MAX) {
fprintf(stderr, "Failed to find gap of requested size: %" PRIu64 "\n",
(uint64_t)size);
abort();
}
trace_find_ram_offset(size, offset);
return offset;
}
unsigned long last_ram_page(void)
{
RAMBlock *block;
ram_addr_t last = 0;
rcu_read_lock();
RAMBLOCK_FOREACH(block) {
last = MAX(last, block->offset + block->max_length);
}
rcu_read_unlock();
return last >> TARGET_PAGE_BITS;
}
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;
}
bool qemu_ram_is_migrate(RAMBlock* rb)
{
return rb->migrate;
}
bool qemu_ram_is_shared(RAMBlock *rb)
{
return rb->flags & RAM_SHARED;
}
bool qemu_ram_is_mapped(RAMBlock *rb)
{
return rb->flags & RAM_MAPPED;
}
/* Note: Only set at the start of postcopy */
bool qemu_ram_is_uf_zeroable(RAMBlock *rb)
{
return rb->flags & RAM_UF_ZEROPAGE;
}
void qemu_ram_set_uf_zeroable(RAMBlock *rb)
{
rb->flags |= RAM_UF_ZEROPAGE;
}
/* 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();
RAMBLOCK_FOREACH(block) {
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));
}
}
void qemu_ram_set_migrate(RAMBlock* block, bool migrate) {
block->migrate = migrate;
}
size_t qemu_ram_pagesize(RAMBlock *rb)
{
return rb->page_size;
}
/* Returns the largest size of page in use */
size_t qemu_ram_pagesize_largest(void)
{
RAMBlock *block;
size_t largest = 0;
RAMBLOCK_FOREACH(block) {
largest = MAX(largest, qemu_ram_pagesize(block));
}
return largest;
}
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, bool shared)
{
RAMBlock *block;
RAMBlock *last_block = NULL;
ram_addr_t old_ram_size, new_ram_size;
Error *err = NULL;
old_ram_size = last_ram_page();
qemu_mutex_lock_ramlist();
new_block->offset = find_ram_offset(new_block->max_length);
if (!new_block->host && !(new_block->flags & RAM_USER_BACKED)) {
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, shared);
if (!new_block->host) {
if (insufficientMemMessage) {
// We've messaged the user on insufficient memory,
// just exit instead of aborting.
qemu_mutex_unlock_ramlist();
_exit(1);
}
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) {
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.
*/
RAMBLOCK_FOREACH(block) {
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);
}
}
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
bool share, int fd,
Error **errp)
{
RAMBlock *new_block;
Error *local_err = NULL;
int64_t file_size;
if (xen_enabled()) {
error_setg(errp, "-mem-path not supported with Xen");
return NULL;
}
if (kvm_enabled() && !kvm_has_sync_mmu()) {
error_setg(errp,
"host lacks kvm mmu notifiers, -mem-path unsupported");
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);
file_size = get_file_size(fd);
if (file_size > 0 && file_size < size) {
error_setg(errp, "backing store %s size 0x%" PRIx64
" does not match 'size' option 0x" RAM_ADDR_FMT,
mem_path, file_size, size);
return NULL;
}
new_block = g_malloc0(sizeof(*new_block));
new_block->mr = mr;
new_block->used_length = size;
new_block->max_length = size;
new_block->flags = RAM_MAPPED | (share ? RAM_SHARED : 0);
new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
if (!new_block->host) {
g_free(new_block);
return NULL;
}
ram_block_add(new_block, &local_err, share);
if (local_err) {
g_free(new_block);
error_propagate(errp, local_err);
return NULL;
}
return new_block;
}
RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
bool share, const char *mem_path,
Error **errp)
{
int fd;
bool created;
RAMBlock *block;
fd = file_ram_open(mem_path, memory_region_name(mr), &created, errp);
if (fd < 0) {
return NULL;
}
block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
if (!block) {
if (created) {
unlink(mem_path);
}
#ifdef _WIN32
_close(fd);
#else
close(fd);
#endif
return NULL;
}
block->path = g_strdup(mem_path);
return block;
}
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, bool share,
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, share);
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,
false, mr, errp);
}
RAMBlock *qemu_ram_alloc(ram_addr_t size, bool share,
MemoryRegion *mr, Error **errp)
{
return qemu_ram_alloc_internal(size, size, NULL, NULL, false,
share, 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,
false, mr, errp);
}
RAMBlock *qemu_ram_alloc_user_backed(ram_addr_t size, MemoryRegion *mr,
Error **errp)
{
fprintf(stderr, "%s: call\n", __func__);
RAMBlock *new_block;
Error *local_err = NULL;
size = HOST_PAGE_ALIGN(size);
new_block = (RAMBlock*)g_malloc0(sizeof(*new_block));
new_block->mr = mr;
new_block->used_length = size;
new_block->max_length = size;
new_block->fd = -1;
new_block->page_size = getpagesize();
new_block->host = NULL;
new_block->flags |= RAM_PREALLOC;
new_block->flags |= RAM_USER_BACKED;
ram_block_add(new_block, &local_err, false /* not shared */);
if (local_err) {
g_free(new_block);
error_propagate(errp, local_err);
return NULL;
}
return new_block;
}
void qemu_user_backed_ram_map_empty(uint64_t gpa, void *hva, uint64_t size, int flags)
{
qemu_abort("FATAL: Did not set ram map function before mapping");
}
void qemu_user_backed_ram_unmap_empty(uint64_t gpa, uint64_t size)
{
qemu_abort("FATAL: Did not set ram unmap function before unmapping");
}
static QemuUserBackedRamMapFunc s_user_backed_ram_map = &qemu_user_backed_ram_map_empty;
static QemuUserBackedRamUnmapFunc s_user_backed_ram_unmap = &qemu_user_backed_ram_unmap_empty;
void qemu_set_user_backed_mapping_funcs(QemuUserBackedRamMapFunc mapFunc,
QemuUserBackedRamUnmapFunc unmapFunc)
{
s_user_backed_ram_map = mapFunc;
s_user_backed_ram_unmap = unmapFunc;
}
void qemu_user_backed_ram_map(uint64_t gpa, void *hva, uint64_t size, int flags)
{
s_user_backed_ram_map(gpa, hva, size, flags);
}
void qemu_user_backed_ram_unmap(uint64_t gpa, uint64_t size)
{
s_user_backed_ram_unmap(gpa, size);
}
static void reclaim_ramblock(RAMBlock *block)
{
if (block->flags & RAM_PREALLOC) {
;
} else if (xen_enabled()) {
xen_invalidate_map_cache_entry(block->host);
} else if (block->fd >= 0) {
qemu_ram_munmap(block->host, block->max_length);
#ifdef _WIN32
_close(block->fd);
#else
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_blocks_exiting) {
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++;
if (ram_blocks_exiting) {
reclaim_ramblock(block);
} else {
call_rcu(block, reclaim_ramblock, rcu);
}
qemu_mutex_unlock_ramlist();
}
void qemu_set_ram_blocks_exiting()
{
ram_blocks_exiting = true;
}
#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;
RAMBLOCK_FOREACH(block) {
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) {
error_report("Could not remap addr: "
RAM_ADDR_FMT "@" RAM_ADDR_FMT "",
length, addr);
exit(1);
}
memory_try_enable_merging(vaddr, length);
qemu_ram_setup_dump(vaddr, length);
}
}
}
}
#endif /* !_WIN32 */
static void ram_block_teardown_backing(RAMBlock* block) {
if (block->fd >= 0) {
qemu_ram_munmap(block->host, block->max_length);
#ifdef _WIN32
_close(block->fd);
#else
close(block->fd);
#endif
block->fd = -1;
} else {
qemu_anon_ram_free(block->host, block->max_length);
}
if (block->path) {
g_free((void*)block->path);
block->path = NULL;
}
block->flags = 0;
}
void ram_block_remap_backing(RAMBlock* block, const char* mem_path, int shared)
{
rcu_read_lock();
// Check against bad usage, since the first move of this function
// is to free |block->path|.
if (mem_path && block->path &&
(mem_path == block->path)) {
qemu_abort(
"%s: Not allowed to alias mem_path and block->path!\n",
__func__);
}
ram_block_teardown_backing(block);
if (mem_path) {
block->path = g_strdup(mem_path);
block->flags = RAM_MAPPED | (shared ? RAM_SHARED : 0);
// Assume it exists
block->fd = try_open_existing_ram_file(block->path);
if (block->fd < 0) {
rcu_read_unlock();
qemu_abort(
"error opening new ram file "
"for guest memory '%s' at %s\n",
memory_region_name(block->mr),
block->path);
abort();
}
// Assume the mapped size hasn't changed
block->host =
qemu_ram_mmap(
block->fd,
block->mapped_size,
block->mr->align,
block->flags & RAM_SHARED);
if (!block->host) {
rcu_read_unlock();
qemu_abort("cannot remap backing for guest memory '%s' "
"to new file (shared: %d)",
memory_region_name(block->mr),
shared);
}
} else {
block->host =
phys_mem_alloc(
block->max_length,
&block->mr->align,
shared);
if (!block->host) {
rcu_read_unlock();
if (insufficientMemMessage) {
// Insufficient for allocation; exit.
_exit(1);
}
// Fatal error in allocation.
qemu_abort(
"cannot remap backing for guest memory '%s' "
"to anonymous backing",
memory_region_name(block->mr));
abort();
}
}
rcu_read_unlock();
}
void ram_blocks_remap_shared(int shared)
{
RAMBlock *block;
RAMBLOCK_FOREACH(block) {
char* remap_path;
if (!block->path) continue;
remap_path = g_strdup(block->path);
ram_block_remap_backing(block, remap_path, shared);
g_free(remap_path);
}
memory_listeners_refresh_topology();
}
/* 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, false);
}
block->host = xen_map_cache(block->offset, block->max_length, 1, false);
}
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, bool lock)
{
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, lock, lock);
}
block->host = xen_map_cache(block->offset, block->max_length, 1, lock);
}
return ramblock_ptr(block, addr);
}
/* Return the offset of a hostpointer within a ramblock */
ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host)
{
ram_addr_t res = (uint8_t *)host - (uint8_t *)rb->host;
assert((uintptr_t)host >= (uintptr_t)rb->host);
assert(res < rb->max_length);
return res;
}
/*
* 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;
}
RAMBLOCK_FOREACH(block) {
/* 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;
RAMBLOCK_FOREACH(block) {
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. */
void memory_notdirty_write_prepare(NotDirtyInfo *ndi,
CPUState *cpu,
vaddr mem_vaddr,
ram_addr_t ram_addr,
unsigned size)
{
ndi->cpu = cpu;
ndi->ram_addr = ram_addr;
ndi->mem_vaddr = mem_vaddr;
ndi->size = size;
ndi->locked = false;
assert(tcg_enabled());
if (!cpu_physical_memory_get_dirty_flag(ram_addr, DIRTY_MEMORY_CODE)) {
ndi->locked = true;
tb_lock();
tb_invalidate_phys_page_fast(ram_addr, size);
}
}
/* Called within RCU critical section. */
void memory_notdirty_write_complete(NotDirtyInfo *ndi)
{
if (ndi->locked) {
tb_unlock();
}
/* Set both VGA and migration bits for simplicity and to remove
* the notdirty callback faster.
*/
cpu_physical_memory_set_dirty_range(ndi->ram_addr, ndi->size,
DIRTY_CLIENTS_NOCODE);
/* we remove the notdirty callback only if the code has been
flushed */
if (!cpu_physical_memory_is_clean(ndi->ram_addr)) {
tlb_set_dirty(ndi->cpu, ndi->mem_vaddr);
}
}
/* Called within RCU critical section. */
static void notdirty_mem_write(void *opaque, hwaddr ram_addr,
uint64_t val, unsigned size)
{
NotDirtyInfo ndi;
memory_notdirty_write_prepare(&ndi, current_cpu, current_cpu->mem_io_vaddr,
ram_addr, size);
switch (size) {