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xemu/exec.c
Marcel Apfelbaum 06329ccecf mem: add share parameter to memory-backend-ram 
Currently only file backed memory backend can
be created with a "share" flag in order to allow
sharing guest RAM with other processes in the host.

Add the "share" flag also to RAM Memory Backend
in order to allow remapping parts of the guest RAM
to different host virtual addresses. This is needed
by the RDMA devices in order to remap non-contiguous
QEMU virtual addresses to a contiguous virtual address range.

Moved the "share" flag to the Host Memory base class,
modified phys_mem_alloc to include the new parameter
and a new interface memory_region_init_ram_shared_nomigrate.

There are no functional changes if the new flag is not used.

Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
2018-02-19 13:03:24 +02:00

3849 lines
110 KiB
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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"
#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/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 "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
#include "monitor/monitor.h"
//#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;
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;
}
/**
* 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)
{
IOMMUTLBEntry iotlb;
MemoryRegionSection *section;
IOMMUMemoryRegion *iommu_mr;
IOMMUMemoryRegionClass *imrc;
hwaddr page_mask = (hwaddr)(-1);
hwaddr plen = (hwaddr)(-1);
if (plen_out) {
plen = *plen_out;
}
for (;;) {
section = address_space_translate_internal(
flatview_to_dispatch(fv), addr, &addr,
&plen, is_mmio);
iommu_mr = memory_region_get_iommu(section->mr);
if (!iommu_mr) {
break;
}
imrc = memory_region_get_iommu_class_nocheck(iommu_mr);
iotlb = imrc->translate(iommu_mr, addr, is_write ?
IOMMU_WO : IOMMU_RO);
addr = ((iotlb.translated_addr & ~iotlb.addr_mask)
| (addr & iotlb.addr_mask));
page_mask &= iotlb.addr_mask;
plen = MIN(plen, (addr | iotlb.addr_mask) - addr + 1);
if (!(iotlb.perm & (1 << is_write))) {
goto translate_fail;
}
fv = address_space_to_flatview(iotlb.target_as);
*target_as = iotlb.target_as;
}
*xlat = addr;
if (page_mask == (hwaddr)(-1)) {
/* Not behind an IOMMU, use default page size. */
page_mask = ~TARGET_PAGE_MASK;
}
if (page_mask_out) {
*page_mask_out = page_mask;
}
if (plen_out) {
*plen_out = plen;
}
return *section;
translate_fail:
return (MemoryRegionSection) { .mr = &io_mem_unassigned };
}
/* 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
}
#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->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;
}
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));
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(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);
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
#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 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 = 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) {
*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;
return area;
}
#endif
/* 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_shared(RAMBlock *rb)
{
return rb->flags & RAM_SHARED;
}
/* 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));
}
}
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) {
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) {
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);
}
}
#ifdef __linux__
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 = 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);
}
close(fd);
return NULL;
}
return 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, 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);
}
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;
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 */
/* 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);
}
/*
* 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) {
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;
case 8:
stq_p(qemu_map_ram_ptr(NULL, ram_addr), val);
break;
default:
abort();
}
memory_notdirty_write_complete(&ndi);
}
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,
.valid = {
.min_access_size = 1,
.max_access_size = 8,
.unaligned = false,
},
.impl = {
.min_access_size = 1,
.max_access_size = 8,
.unaligned = false,
},
};
/* 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);
target_ulong vaddr;
CPUWatchpoint *wp;
assert(tcg_enabled());
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;
/* Both tb_lock and iothread_mutex 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 {
/* Force execution of one insn next time. */
cpu->cflags_next_tb = 1 | curr_cflags();
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;
case 8:
data = address_space_ldq(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;
case 8:
address_space_stq(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,
.valid = {
.min_access_size = 1,
.max_access_size = 8,
.unaligned = false,
},
.impl = {
.min_access_size = 1,
.max_access_size = 8,
.unaligned = false,
},
};
static MemTxResult flatview_write(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
const uint8_t *buf, int len);
static bool flatview_access_valid(FlatView *fv, hwaddr addr, int len,
bool is_write);
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 = flatview_read(subpage->fv, 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 flatview_write(subpage->fv, 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 flatview_access_valid(subpage->fv, 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(FlatView *fv, hwaddr base)
{
subpage_t *mmio;
mmio = g_malloc0(sizeof(subpage_t) + TARGET_PAGE_SIZE * sizeof(uint16_t));
mmio->fv = fv;
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, FlatView *fv, MemoryRegion *mr)
{
assert(fv);
MemoryRegionSection section = {
.fv = fv,
.mr = mr,
.offset_within_address_space = 0,
.offset_within_region = 0,
.size = int128_2_64(),
};
return phys_section_add(map, &section);
}
static void readonly_mem_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
/* Ignore any write to ROM. */
}
static bool readonly_mem_accepts(void *opaque, hwaddr addr,
unsigned size, bool is_write)
{
return is_write;
}
/* This will only be used for writes, because reads are special cased
* to directly access the underlying host ram.
*/
static const MemoryRegionOps readonly_mem_ops = {
.write = readonly_mem_write,
.valid.accepts = readonly_mem_accepts,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 8,
.unaligned = false,
},
.impl = {
.min_access_size = 1,
.max_access_size = 8,
.unaligned = false,
},
};
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, &readonly_mem_ops,
NULL, NULL, UINT64_MAX);
memory_region_init_io(&io_mem_unassigned, NULL, &unassigned_mem_ops, NULL,
NULL, UINT64_MAX);
/* io_mem_notdirty calls tb_invalidate_phys_page_fast,
* which can be called without the iothread mutex.
*/
memory_region_init_io(&io_mem_notdirty, NULL, &notdirty_mem_ops, NULL,
NULL, UINT64_MAX);
memory_region_clear_global_locking(&io_mem_notdirty);
memory_region_init_io(&io_mem_watch, NULL, &watch_mem_ops, NULL,
NULL, UINT64_MAX);
}
AddressSpaceDispatch *address_space_dispatch_new(FlatView *fv)
{
AddressSpaceDispatch *d = g_new0(AddressSpaceDispatch, 1);
uint16_t n;
n = dummy_section(&d->map, fv, &io_mem_unassigned);
assert(n == PHYS_SECTION_UNASSIGNED);
n = dummy_section(&d->map, fv, &io_mem_notdirty);
assert(n == PHYS_SECTION_NOTDIRTY);
n = dummy_section(&d->map, fv, &io_mem_rom);
assert(n == PHYS_SECTION_ROM);
n = dummy_section(&d->map, fv, &io_mem_watch);
assert(n == PHYS_SECTION_WATCH);
d->phys_map = (PhysPageEntry) { .ptr = PHYS_MAP_NODE_NIL, .skip = 1 };
return d;
}
void address_space_dispatch_free(AddressSpaceDispatch *d)
{
phys_sections_free(&d->map);
g_free(d);
}
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 = address_space_to_dispatch(cpuas->as);
atomic_rcu_set(&cpuas->memory_dispatch, d);
tlb_flush(cpuas->cpu);
}
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)) {
assert(tcg_enabled());
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 flatview_write_continue(FlatView *fv, 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_ram_ptr_length(mr->ram_block, addr1, &l, false);
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 = flatview_translate(fv, addr, &addr1, &l, true);
}
return result;
}
static MemTxResult flatview_write(FlatView *fv, 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 = flatview_translate(fv, addr, &addr1, &l, true);
result = flatview_write_continue(fv, addr, attrs, buf, len,
addr1, l, mr);
rcu_read_unlock();
}
return result;
}
MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs,
const uint8_t *buf, int len)
{
return flatview_write(address_space_to_flatview(as), addr, attrs, buf, len);
}
/* Called within RCU critical section. */
MemTxResult flatview_read_continue(FlatView *fv, 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_ram_ptr_length(mr->ram_block, addr1, &l, false);
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 = flatview_translate(fv, addr, &addr1, &l, false);
}
return result;
}
MemTxResult flatview_read_full(FlatView *fv, 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 = flatview_translate(fv, addr, &addr1, &l, false);
result = flatview_read_continue(fv, addr, attrs, buf, len,
addr1, l, mr);
rcu_read_unlock();
}
return result;
}
static MemTxResult flatview_rw(FlatView *fv, hwaddr addr, MemTxAttrs attrs,
uint8_t *buf, int len, bool is_write)
{
if (is_write) {
return flatview_write(fv, addr, attrs, (uint8_t *)buf, len);
} else {
return flatview_read(fv, addr, attrs, (uint8_t *)buf, len);
}
}
MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, uint8_t *buf,
int len, bool is_write)
{
return flatview_rw(address_space_to_flatview(as),
addr, attrs, buf, len, is_write);
}
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);
}
static bool flatview_access_valid(FlatView *fv, hwaddr addr, int len,
bool is_write)
{
MemoryRegion *mr;
hwaddr l, xlat;
rcu_read_lock();
while (len > 0) {
l = len;
mr = flatview_translate(fv, 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;
}
bool address_space_access_valid(AddressSpace *as, hwaddr addr,
int len, bool is_write)
{
return flatview_access_valid(address_space_to_flatview(as),
addr, len, is_write);
}
static hwaddr
flatview_extend_translation(FlatView *fv, 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 = flatview_translate(fv, 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;
FlatView *fv = address_space_to_flatview(as);
if (len == 0) {
return NULL;
}
l = len;
rcu_read_lock();
mr = flatview_translate(fv, 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) {
flatview_read(fv, addr, MEMTXATTRS_UNSPECIFIED,
bounce.buffer, l);
}
rcu_read_unlock();
*plen = l;
return bounce.buffer;
}
memory_region_ref(mr);
*plen = flatview_extend_translation(fv, addr, len, mr, xlat,
l, is_write);
ptr = qemu_ram_ptr_length(mr->ram_block, xlat, plen, true);
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)
{
cache->len = len;
cache->as = as;
cache->xlat = addr;
return len;
}
void address_space_cache_invalidate(MemoryRegionCache *cache,
hwaddr addr,
hwaddr access_len)
{
}
void address_space_cache_destroy(MemoryRegionCache *cache)
{
cache->as = NULL;
}
#define ARG1_DECL MemoryRegionCache *cache
#define ARG1 cache
#define SUFFIX _cached
#define TRANSLATE(addr, ...) \
address_space_translate(cache->as, cache->xlat + (addr), __VA_ARGS__)
#define IS_DIRECT(mr, is_write) true
#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"
/* 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;
cpu_synchronize_state(cpu);
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_size(void)
{
return TARGET_PAGE_SIZE;
}
int qemu_target_page_bits(void)
{
return TARGET_PAGE_BITS;
}
int qemu_target_page_bits_min(void)
{
return TARGET_PAGE_BITS_MIN;
}
#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();
RAMBLOCK_FOREACH(block) {
ret = func(block->idstr, block->host, block->offset,
block->used_length, opaque);
if (ret) {
break;
}
}
rcu_read_unlock();
return ret;
}
/*
* Unmap pages of memory from start to start+length such that
* they a) read as 0, b) Trigger whatever fault mechanism
* the OS provides for postcopy.
* The pages must be unmapped by the end of the function.
* Returns: 0 on success, none-0 on failure
*
*/
int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length)
{
int ret = -1;
uint8_t *host_startaddr = rb->host + start;
if ((uintptr_t)host_startaddr & (rb->page_size - 1)) {
error_report("ram_block_discard_range: Unaligned start address: %p",
host_startaddr);
goto err;
}
if ((start + length) <= rb->used_length) {
uint8_t *host_endaddr = host_startaddr + length;
if ((uintptr_t)host_endaddr & (rb->page_size - 1)) {
error_report("ram_block_discard_range: Unaligned end address: %p",
host_endaddr);
goto err;
}
errno = ENOTSUP; /* If we are missing MADVISE etc */
if (rb->page_size == qemu_host_page_size) {
#if defined(CONFIG_MADVISE)
/* Note: We need the madvise MADV_DONTNEED behaviour of definitely
* freeing the page.
*/
ret = madvise(host_startaddr, length, MADV_DONTNEED);
#endif
} else {
/* Huge page case - unfortunately it can't do DONTNEED, but
* it can do the equivalent by FALLOC_FL_PUNCH_HOLE in the
* huge page file.
*/
#ifdef CONFIG_FALLOCATE_PUNCH_HOLE
ret = fallocate(rb->fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
start, length);
#endif
}
if (ret) {
ret = -errno;
error_report("ram_block_discard_range: Failed to discard range "
"%s:%" PRIx64 " +%zx (%d)",
rb->idstr, start, length, ret);
}
} else {
error_report("ram_block_discard_range: Overrun block '%s' (%" PRIu64
"/%zx/" RAM_ADDR_FMT")",
rb->idstr, start, length, rb->used_length);
}
err:
return ret;
}
#endif
void page_size_init(void)
{
/* NOTE: we can always suppose that qemu_host_page_size >=
TARGET_PAGE_SIZE */
if (qemu_host_page_size == 0) {
qemu_host_page_size = qemu_real_host_page_size;
}
if (qemu_host_page_size < TARGET_PAGE_SIZE) {
qemu_host_page_size = TARGET_PAGE_SIZE;
}
qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
}
#if !defined(CONFIG_USER_ONLY)
static void mtree_print_phys_entries(fprintf_function mon, void *f,
int start, int end, int skip, int ptr)
{
if (start == end - 1) {
mon(f, "\t%3d ", start);
} else {
mon(f, "\t%3d..%-3d ", start, end - 1);
}
mon(f, " skip=%d ", skip);
if (ptr == PHYS_MAP_NODE_NIL) {
mon(f, " ptr=NIL");
} else if (!skip) {
mon(f, " ptr=#%d", ptr);
} else {
mon(f, " ptr=[%d]", ptr);
}
mon(f, "\n");
}
#define MR_SIZE(size) (int128_nz(size) ? (hwaddr)int128_get64( \
int128_sub((size), int128_one())) : 0)
void mtree_print_dispatch(fprintf_function mon, void *f,
AddressSpaceDispatch *d, MemoryRegion *root)
{
int i;
mon(f, " Dispatch\n");
mon(f, " Physical sections\n");
for (i = 0; i < d->map.sections_nb; ++i) {
MemoryRegionSection *s = d->map.sections + i;
const char *names[] = { " [unassigned]", " [not dirty]",
" [ROM]", " [watch]" };
mon(f, " #%d @" TARGET_FMT_plx ".." TARGET_FMT_plx " %s%s%s%s%s",
i,
s->offset_within_address_space,
s->offset_within_address_space + MR_SIZE(s->mr->size),
s->mr->name ? s->mr->name : "(noname)",
i < ARRAY_SIZE(names) ? names[i] : "",
s->mr == root ? " [ROOT]" : "",
s == d->mru_section ? " [MRU]" : "",
s->mr->is_iommu ? " [iommu]" : "");
if (s->mr->alias) {
mon(f, " alias=%s", s->mr->alias->name ?
s->mr->alias->name : "noname");
}
mon(f, "\n");
}
mon(f, " Nodes (%d bits per level, %d levels) ptr=[%d] skip=%d\n",
P_L2_BITS, P_L2_LEVELS, d->phys_map.ptr, d->phys_map.skip);
for (i = 0; i < d->map.nodes_nb; ++i) {
int j, jprev;
PhysPageEntry prev;
Node *n = d->map.nodes + i;
mon(f, " [%d]\n", i);
for (j = 0, jprev = 0, prev = *n[0]; j < ARRAY_SIZE(*n); ++j) {
PhysPageEntry *pe = *n + j;
if (pe->ptr == prev.ptr && pe->skip == prev.skip) {
continue;
}
mtree_print_phys_entries(mon, f, jprev, j, prev.skip, prev.ptr);
jprev = j;
prev = *pe;
}
if (jprev != ARRAY_SIZE(*n)) {
mtree_print_phys_entries(mon, f, jprev, j, prev.skip, prev.ptr);
}
}
}
#endif
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