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qemu/include/exec/memory.h
Hyman Huang(黄勇) cc2b33eab0 softmmu/dirtylimit: Implement vCPU dirtyrate calculation periodically 
Introduce the third method GLOBAL_DIRTY_LIMIT of dirty
tracking for calculate dirtyrate periodly for dirty page
rate limit.

Add dirtylimit.c to implement dirtyrate calculation periodly,
which will be used for dirty page rate limit.

Add dirtylimit.h to export util functions for dirty page rate
limit implementation.

Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <5d0d641bffcb9b1c4cc3e323b6dfecb36050d948.1656177590.git.huangy81@chinatelecom.cn>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2022-07-20 12:15:08 +01:00

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/*
* Physical memory management API
*
* Copyright 2011 Red Hat, Inc. and/or its affiliates
*
* Authors:
* Avi Kivity <avi@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#ifndef MEMORY_H
#define MEMORY_H
#ifndef CONFIG_USER_ONLY
#include "exec/cpu-common.h"
#include "exec/hwaddr.h"
#include "exec/memattrs.h"
#include "exec/memop.h"
#include "exec/ramlist.h"
#include "qemu/bswap.h"
#include "qemu/queue.h"
#include "qemu/int128.h"
#include "qemu/notify.h"
#include "qom/object.h"
#include "qemu/rcu.h"
#define RAM_ADDR_INVALID (~(ram_addr_t)0)
#define MAX_PHYS_ADDR_SPACE_BITS 62
#define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
#define TYPE_MEMORY_REGION "memory-region"
DECLARE_INSTANCE_CHECKER(MemoryRegion, MEMORY_REGION,
TYPE_MEMORY_REGION)
#define TYPE_IOMMU_MEMORY_REGION "iommu-memory-region"
typedef struct IOMMUMemoryRegionClass IOMMUMemoryRegionClass;
DECLARE_OBJ_CHECKERS(IOMMUMemoryRegion, IOMMUMemoryRegionClass,
IOMMU_MEMORY_REGION, TYPE_IOMMU_MEMORY_REGION)
#define TYPE_RAM_DISCARD_MANAGER "qemu:ram-discard-manager"
typedef struct RamDiscardManagerClass RamDiscardManagerClass;
typedef struct RamDiscardManager RamDiscardManager;
DECLARE_OBJ_CHECKERS(RamDiscardManager, RamDiscardManagerClass,
RAM_DISCARD_MANAGER, TYPE_RAM_DISCARD_MANAGER);
#ifdef CONFIG_FUZZ
void fuzz_dma_read_cb(size_t addr,
size_t len,
MemoryRegion *mr);
#else
static inline void fuzz_dma_read_cb(size_t addr,
size_t len,
MemoryRegion *mr)
{
/* Do Nothing */
}
#endif
/* Possible bits for global_dirty_log_{start|stop} */
/* Dirty tracking enabled because migration is running */
#define GLOBAL_DIRTY_MIGRATION (1U << 0)
/* Dirty tracking enabled because measuring dirty rate */
#define GLOBAL_DIRTY_DIRTY_RATE (1U << 1)
/* Dirty tracking enabled because dirty limit */
#define GLOBAL_DIRTY_LIMIT (1U << 2)
#define GLOBAL_DIRTY_MASK (0x7)
extern unsigned int global_dirty_tracking;
typedef struct MemoryRegionOps MemoryRegionOps;
struct ReservedRegion {
hwaddr low;
hwaddr high;
unsigned type;
};
/**
* struct MemoryRegionSection: describes a fragment of a #MemoryRegion
*
* @mr: the region, or %NULL if empty
* @fv: the flat view of the address space the region is mapped in
* @offset_within_region: the beginning of the section, relative to @mr's start
* @size: the size of the section; will not exceed @mr's boundaries
* @offset_within_address_space: the address of the first byte of the section
* relative to the region's address space
* @readonly: writes to this section are ignored
* @nonvolatile: this section is non-volatile
*/
struct MemoryRegionSection {
Int128 size;
MemoryRegion *mr;
FlatView *fv;
hwaddr offset_within_region;
hwaddr offset_within_address_space;
bool readonly;
bool nonvolatile;
};
typedef struct IOMMUTLBEntry IOMMUTLBEntry;
/* See address_space_translate: bit 0 is read, bit 1 is write. */
typedef enum {
IOMMU_NONE = 0,
IOMMU_RO = 1,
IOMMU_WO = 2,
IOMMU_RW = 3,
} IOMMUAccessFlags;
#define IOMMU_ACCESS_FLAG(r, w) (((r) ? IOMMU_RO : 0) | ((w) ? IOMMU_WO : 0))
struct IOMMUTLBEntry {
AddressSpace *target_as;
hwaddr iova;
hwaddr translated_addr;
hwaddr addr_mask; /* 0xfff = 4k translation */
IOMMUAccessFlags perm;
};
/*
* Bitmap for different IOMMUNotifier capabilities. Each notifier can
* register with one or multiple IOMMU Notifier capability bit(s).
*/
typedef enum {
IOMMU_NOTIFIER_NONE = 0,
/* Notify cache invalidations */
IOMMU_NOTIFIER_UNMAP = 0x1,
/* Notify entry changes (newly created entries) */
IOMMU_NOTIFIER_MAP = 0x2,
/* Notify changes on device IOTLB entries */
IOMMU_NOTIFIER_DEVIOTLB_UNMAP = 0x04,
} IOMMUNotifierFlag;
#define IOMMU_NOTIFIER_IOTLB_EVENTS (IOMMU_NOTIFIER_MAP | IOMMU_NOTIFIER_UNMAP)
#define IOMMU_NOTIFIER_DEVIOTLB_EVENTS IOMMU_NOTIFIER_DEVIOTLB_UNMAP
#define IOMMU_NOTIFIER_ALL (IOMMU_NOTIFIER_IOTLB_EVENTS | \
IOMMU_NOTIFIER_DEVIOTLB_EVENTS)
struct IOMMUNotifier;
typedef void (*IOMMUNotify)(struct IOMMUNotifier *notifier,
IOMMUTLBEntry *data);
struct IOMMUNotifier {
IOMMUNotify notify;
IOMMUNotifierFlag notifier_flags;
/* Notify for address space range start <= addr <= end */
hwaddr start;
hwaddr end;
int iommu_idx;
QLIST_ENTRY(IOMMUNotifier) node;
};
typedef struct IOMMUNotifier IOMMUNotifier;
typedef struct IOMMUTLBEvent {
IOMMUNotifierFlag type;
IOMMUTLBEntry entry;
} IOMMUTLBEvent;
/* 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.
* Resizing RAM while migrating can result in the migration being canceled.
*/
#define RAM_RESIZEABLE (1 << 2)
/* 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)
/* RAM can be migrated */
#define RAM_MIGRATABLE (1 << 4)
/* RAM is a persistent kind memory */
#define RAM_PMEM (1 << 5)
/*
* UFFDIO_WRITEPROTECT is used on this RAMBlock to
* support 'write-tracking' migration type.
* Implies ram_state->ram_wt_enabled.
*/
#define RAM_UF_WRITEPROTECT (1 << 6)
/*
* RAM is mmap-ed with MAP_NORESERVE. When set, reserving swap space (or huge
* pages if applicable) is skipped: will bail out if not supported. When not
* set, the OS will do the reservation, if supported for the memory type.
*/
#define RAM_NORESERVE (1 << 7)
/* RAM that isn't accessible through normal means. */
#define RAM_PROTECTED (1 << 8)
static inline void iommu_notifier_init(IOMMUNotifier *n, IOMMUNotify fn,
IOMMUNotifierFlag flags,
hwaddr start, hwaddr end,
int iommu_idx)
{
n->notify = fn;
n->notifier_flags = flags;
n->start = start;
n->end = end;
n->iommu_idx = iommu_idx;
}
/*
* Memory region callbacks
*/
struct MemoryRegionOps {
/* Read from the memory region. @addr is relative to @mr; @size is
* in bytes. */
uint64_t (*read)(void *opaque,
hwaddr addr,
unsigned size);
/* Write to the memory region. @addr is relative to @mr; @size is
* in bytes. */
void (*write)(void *opaque,
hwaddr addr,
uint64_t data,
unsigned size);
MemTxResult (*read_with_attrs)(void *opaque,
hwaddr addr,
uint64_t *data,
unsigned size,
MemTxAttrs attrs);
MemTxResult (*write_with_attrs)(void *opaque,
hwaddr addr,
uint64_t data,
unsigned size,
MemTxAttrs attrs);
enum device_endian endianness;
/* Guest-visible constraints: */
struct {
/* If nonzero, specify bounds on access sizes beyond which a machine
* check is thrown.
*/
unsigned min_access_size;
unsigned max_access_size;
/* If true, unaligned accesses are supported. Otherwise unaligned
* accesses throw machine checks.
*/
bool unaligned;
/*
* If present, and returns #false, the transaction is not accepted
* by the device (and results in machine dependent behaviour such
* as a machine check exception).
*/
bool (*accepts)(void *opaque, hwaddr addr,
unsigned size, bool is_write,
MemTxAttrs attrs);
} valid;
/* Internal implementation constraints: */
struct {
/* If nonzero, specifies the minimum size implemented. Smaller sizes
* will be rounded upwards and a partial result will be returned.
*/
unsigned min_access_size;
/* If nonzero, specifies the maximum size implemented. Larger sizes
* will be done as a series of accesses with smaller sizes.
*/
unsigned max_access_size;
/* If true, unaligned accesses are supported. Otherwise all accesses
* are converted to (possibly multiple) naturally aligned accesses.
*/
bool unaligned;
} impl;
};
typedef struct MemoryRegionClass {
/* private */
ObjectClass parent_class;
} MemoryRegionClass;
enum IOMMUMemoryRegionAttr {
IOMMU_ATTR_SPAPR_TCE_FD
};
/*
* IOMMUMemoryRegionClass:
*
* All IOMMU implementations need to subclass TYPE_IOMMU_MEMORY_REGION
* and provide an implementation of at least the @translate method here
* to handle requests to the memory region. Other methods are optional.
*
* The IOMMU implementation must use the IOMMU notifier infrastructure
* to report whenever mappings are changed, by calling
* memory_region_notify_iommu() (or, if necessary, by calling
* memory_region_notify_iommu_one() for each registered notifier).
*
* Conceptually an IOMMU provides a mapping from input address
* to an output TLB entry. If the IOMMU is aware of memory transaction
* attributes and the output TLB entry depends on the transaction
* attributes, we represent this using IOMMU indexes. Each index
* selects a particular translation table that the IOMMU has:
*
* @attrs_to_index returns the IOMMU index for a set of transaction attributes
*
* @translate takes an input address and an IOMMU index
*
* and the mapping returned can only depend on the input address and the
* IOMMU index.
*
* Most IOMMUs don't care about the transaction attributes and support
* only a single IOMMU index. A more complex IOMMU might have one index
* for secure transactions and one for non-secure transactions.
*/
struct IOMMUMemoryRegionClass {
/* private: */
MemoryRegionClass parent_class;
/* public: */
/**
* @translate:
*
* Return a TLB entry that contains a given address.
*
* The IOMMUAccessFlags indicated via @flag are optional and may
* be specified as IOMMU_NONE to indicate that the caller needs
* the full translation information for both reads and writes. If
* the access flags are specified then the IOMMU implementation
* may use this as an optimization, to stop doing a page table
* walk as soon as it knows that the requested permissions are not
* allowed. If IOMMU_NONE is passed then the IOMMU must do the
* full page table walk and report the permissions in the returned
* IOMMUTLBEntry. (Note that this implies that an IOMMU may not
* return different mappings for reads and writes.)
*
* The returned information remains valid while the caller is
* holding the big QEMU lock or is inside an RCU critical section;
* if the caller wishes to cache the mapping beyond that it must
* register an IOMMU notifier so it can invalidate its cached
* information when the IOMMU mapping changes.
*
* @iommu: the IOMMUMemoryRegion
*
* @hwaddr: address to be translated within the memory region
*
* @flag: requested access permission
*
* @iommu_idx: IOMMU index for the translation
*/
IOMMUTLBEntry (*translate)(IOMMUMemoryRegion *iommu, hwaddr addr,
IOMMUAccessFlags flag, int iommu_idx);
/**
* @get_min_page_size:
*
* Returns minimum supported page size in bytes.
*
* If this method is not provided then the minimum is assumed to
* be TARGET_PAGE_SIZE.
*
* @iommu: the IOMMUMemoryRegion
*/
uint64_t (*get_min_page_size)(IOMMUMemoryRegion *iommu);
/**
* @notify_flag_changed:
*
* Called when IOMMU Notifier flag changes (ie when the set of
* events which IOMMU users are requesting notification for changes).
* Optional method -- need not be provided if the IOMMU does not
* need to know exactly which events must be notified.
*
* @iommu: the IOMMUMemoryRegion
*
* @old_flags: events which previously needed to be notified
*
* @new_flags: events which now need to be notified
*
* Returns 0 on success, or a negative errno; in particular
* returns -EINVAL if the new flag bitmap is not supported by the
* IOMMU memory region. In case of failure, the error object
* must be created
*/
int (*notify_flag_changed)(IOMMUMemoryRegion *iommu,
IOMMUNotifierFlag old_flags,
IOMMUNotifierFlag new_flags,
Error **errp);
/**
* @replay:
*
* Called to handle memory_region_iommu_replay().
*
* The default implementation of memory_region_iommu_replay() is to
* call the IOMMU translate method for every page in the address space
* with flag == IOMMU_NONE and then call the notifier if translate
* returns a valid mapping. If this method is implemented then it
* overrides the default behaviour, and must provide the full semantics
* of memory_region_iommu_replay(), by calling @notifier for every
* translation present in the IOMMU.
*
* Optional method -- an IOMMU only needs to provide this method
* if the default is inefficient or produces undesirable side effects.
*
* Note: this is not related to record-and-replay functionality.
*/
void (*replay)(IOMMUMemoryRegion *iommu, IOMMUNotifier *notifier);
/**
* @get_attr:
*
* Get IOMMU misc attributes. This is an optional method that
* can be used to allow users of the IOMMU to get implementation-specific
* information. The IOMMU implements this method to handle calls
* by IOMMU users to memory_region_iommu_get_attr() by filling in
* the arbitrary data pointer for any IOMMUMemoryRegionAttr values that
* the IOMMU supports. If the method is unimplemented then
* memory_region_iommu_get_attr() will always return -EINVAL.
*
* @iommu: the IOMMUMemoryRegion
*
* @attr: attribute being queried
*
* @data: memory to fill in with the attribute data
*
* Returns 0 on success, or a negative errno; in particular
* returns -EINVAL for unrecognized or unimplemented attribute types.
*/
int (*get_attr)(IOMMUMemoryRegion *iommu, enum IOMMUMemoryRegionAttr attr,
void *data);
/**
* @attrs_to_index:
*
* Return the IOMMU index to use for a given set of transaction attributes.
*
* Optional method: if an IOMMU only supports a single IOMMU index then
* the default implementation of memory_region_iommu_attrs_to_index()
* will return 0.
*
* The indexes supported by an IOMMU must be contiguous, starting at 0.
*
* @iommu: the IOMMUMemoryRegion
* @attrs: memory transaction attributes
*/
int (*attrs_to_index)(IOMMUMemoryRegion *iommu, MemTxAttrs attrs);
/**
* @num_indexes:
*
* Return the number of IOMMU indexes this IOMMU supports.
*
* Optional method: if this method is not provided, then
* memory_region_iommu_num_indexes() will return 1, indicating that
* only a single IOMMU index is supported.
*
* @iommu: the IOMMUMemoryRegion
*/
int (*num_indexes)(IOMMUMemoryRegion *iommu);
/**
* @iommu_set_page_size_mask:
*
* Restrict the page size mask that can be supported with a given IOMMU
* memory region. Used for example to propagate host physical IOMMU page
* size mask limitations to the virtual IOMMU.
*
* Optional method: if this method is not provided, then the default global
* page mask is used.
*
* @iommu: the IOMMUMemoryRegion
*
* @page_size_mask: a bitmask of supported page sizes. At least one bit,
* representing the smallest page size, must be set. Additional set bits
* represent supported block sizes. For example a host physical IOMMU that
* uses page tables with a page size of 4kB, and supports 2MB and 4GB
* blocks, will set mask 0x40201000. A granule of 4kB with indiscriminate
* block sizes is specified with mask 0xfffffffffffff000.
*
* Returns 0 on success, or a negative error. In case of failure, the error
* object must be created.
*/
int (*iommu_set_page_size_mask)(IOMMUMemoryRegion *iommu,
uint64_t page_size_mask,
Error **errp);
};
typedef struct RamDiscardListener RamDiscardListener;
typedef int (*NotifyRamPopulate)(RamDiscardListener *rdl,
MemoryRegionSection *section);
typedef void (*NotifyRamDiscard)(RamDiscardListener *rdl,
MemoryRegionSection *section);
struct RamDiscardListener {
/*
* @notify_populate:
*
* Notification that previously discarded memory is about to get populated.
* Listeners are able to object. If any listener objects, already
* successfully notified listeners are notified about a discard again.
*
* @rdl: the #RamDiscardListener getting notified
* @section: the #MemoryRegionSection to get populated. The section
* is aligned within the memory region to the minimum granularity
* unless it would exceed the registered section.
*
* Returns 0 on success. If the notification is rejected by the listener,
* an error is returned.
*/
NotifyRamPopulate notify_populate;
/*
* @notify_discard:
*
* Notification that previously populated memory was discarded successfully
* and listeners should drop all references to such memory and prevent
* new population (e.g., unmap).
*
* @rdl: the #RamDiscardListener getting notified
* @section: the #MemoryRegionSection to get populated. The section
* is aligned within the memory region to the minimum granularity
* unless it would exceed the registered section.
*/
NotifyRamDiscard notify_discard;
/*
* @double_discard_supported:
*
* The listener suppors getting @notify_discard notifications that span
* already discarded parts.
*/
bool double_discard_supported;
MemoryRegionSection *section;
QLIST_ENTRY(RamDiscardListener) next;
};
static inline void ram_discard_listener_init(RamDiscardListener *rdl,
NotifyRamPopulate populate_fn,
NotifyRamDiscard discard_fn,
bool double_discard_supported)
{
rdl->notify_populate = populate_fn;
rdl->notify_discard = discard_fn;
rdl->double_discard_supported = double_discard_supported;
}
typedef int (*ReplayRamPopulate)(MemoryRegionSection *section, void *opaque);
typedef void (*ReplayRamDiscard)(MemoryRegionSection *section, void *opaque);
/*
* RamDiscardManagerClass:
*
* A #RamDiscardManager coordinates which parts of specific RAM #MemoryRegion
* regions are currently populated to be used/accessed by the VM, notifying
* after parts were discarded (freeing up memory) and before parts will be
* populated (consuming memory), to be used/acessed by the VM.
*
* A #RamDiscardManager can only be set for a RAM #MemoryRegion while the
* #MemoryRegion isn't mapped yet; it cannot change while the #MemoryRegion is
* mapped.
*
* The #RamDiscardManager is intended to be used by technologies that are
* incompatible with discarding of RAM (e.g., VFIO, which may pin all
* memory inside a #MemoryRegion), and require proper coordination to only
* map the currently populated parts, to hinder parts that are expected to
* remain discarded from silently getting populated and consuming memory.
* Technologies that support discarding of RAM don't have to bother and can
* simply map the whole #MemoryRegion.
*
* An example #RamDiscardManager is virtio-mem, which logically (un)plugs
* memory within an assigned RAM #MemoryRegion, coordinated with the VM.
* Logically unplugging memory consists of discarding RAM. The VM agreed to not
* access unplugged (discarded) memory - especially via DMA. virtio-mem will
* properly coordinate with listeners before memory is plugged (populated),
* and after memory is unplugged (discarded).
*
* Listeners are called in multiples of the minimum granularity (unless it
* would exceed the registered range) and changes are aligned to the minimum
* granularity within the #MemoryRegion. Listeners have to prepare for memory
* becomming discarded in a different granularity than it was populated and the
* other way around.
*/
struct RamDiscardManagerClass {
/* private */
InterfaceClass parent_class;
/* public */
/**
* @get_min_granularity:
*
* Get the minimum granularity in which listeners will get notified
* about changes within the #MemoryRegion via the #RamDiscardManager.
*
* @rdm: the #RamDiscardManager
* @mr: the #MemoryRegion
*
* Returns the minimum granularity.
*/
uint64_t (*get_min_granularity)(const RamDiscardManager *rdm,
const MemoryRegion *mr);
/**
* @is_populated:
*
* Check whether the given #MemoryRegionSection is completely populated
* (i.e., no parts are currently discarded) via the #RamDiscardManager.
* There are no alignment requirements.
*
* @rdm: the #RamDiscardManager
* @section: the #MemoryRegionSection
*
* Returns whether the given range is completely populated.
*/
bool (*is_populated)(const RamDiscardManager *rdm,
const MemoryRegionSection *section);
/**
* @replay_populated:
*
* Call the #ReplayRamPopulate callback for all populated parts within the
* #MemoryRegionSection via the #RamDiscardManager.
*
* In case any call fails, no further calls are made.
*
* @rdm: the #RamDiscardManager
* @section: the #MemoryRegionSection
* @replay_fn: the #ReplayRamPopulate callback
* @opaque: pointer to forward to the callback
*
* Returns 0 on success, or a negative error if any notification failed.
*/
int (*replay_populated)(const RamDiscardManager *rdm,
MemoryRegionSection *section,
ReplayRamPopulate replay_fn, void *opaque);
/**
* @replay_discarded:
*
* Call the #ReplayRamDiscard callback for all discarded parts within the
* #MemoryRegionSection via the #RamDiscardManager.
*
* @rdm: the #RamDiscardManager
* @section: the #MemoryRegionSection
* @replay_fn: the #ReplayRamDiscard callback
* @opaque: pointer to forward to the callback
*/
void (*replay_discarded)(const RamDiscardManager *rdm,
MemoryRegionSection *section,
ReplayRamDiscard replay_fn, void *opaque);
/**
* @register_listener:
*
* Register a #RamDiscardListener for the given #MemoryRegionSection and
* immediately notify the #RamDiscardListener about all populated parts
* within the #MemoryRegionSection via the #RamDiscardManager.
*
* In case any notification fails, no further notifications are triggered
* and an error is logged.
*
* @rdm: the #RamDiscardManager
* @rdl: the #RamDiscardListener
* @section: the #MemoryRegionSection
*/
void (*register_listener)(RamDiscardManager *rdm,
RamDiscardListener *rdl,
MemoryRegionSection *section);
/**
* @unregister_listener:
*
* Unregister a previously registered #RamDiscardListener via the
* #RamDiscardManager after notifying the #RamDiscardListener about all
* populated parts becoming unpopulated within the registered
* #MemoryRegionSection.
*
* @rdm: the #RamDiscardManager
* @rdl: the #RamDiscardListener
*/
void (*unregister_listener)(RamDiscardManager *rdm,
RamDiscardListener *rdl);
};
uint64_t ram_discard_manager_get_min_granularity(const RamDiscardManager *rdm,
const MemoryRegion *mr);
bool ram_discard_manager_is_populated(const RamDiscardManager *rdm,
const MemoryRegionSection *section);
int ram_discard_manager_replay_populated(const RamDiscardManager *rdm,
MemoryRegionSection *section,
ReplayRamPopulate replay_fn,
void *opaque);
void ram_discard_manager_replay_discarded(const RamDiscardManager *rdm,
MemoryRegionSection *section,
ReplayRamDiscard replay_fn,
void *opaque);
void ram_discard_manager_register_listener(RamDiscardManager *rdm,
RamDiscardListener *rdl,
MemoryRegionSection *section);
void ram_discard_manager_unregister_listener(RamDiscardManager *rdm,
RamDiscardListener *rdl);
typedef struct CoalescedMemoryRange CoalescedMemoryRange;
typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
/** MemoryRegion:
*
* A struct representing a memory region.
*/
struct MemoryRegion {
Object parent_obj;
/* private: */
/* The following fields should fit in a cache line */
bool romd_mode;
bool ram;
bool subpage;
bool readonly; /* For RAM regions */
bool nonvolatile;
bool rom_device;
bool flush_coalesced_mmio;
uint8_t dirty_log_mask;
bool is_iommu;
RAMBlock *ram_block;
Object *owner;
const MemoryRegionOps *ops;
void *opaque;
MemoryRegion *container;
int mapped_via_alias; /* Mapped via an alias, container might be NULL */
Int128 size;
hwaddr addr;
void (*destructor)(MemoryRegion *mr);
uint64_t align;
bool terminates;
bool ram_device;
bool enabled;
bool warning_printed; /* For reservations */
uint8_t vga_logging_count;
MemoryRegion *alias;
hwaddr alias_offset;
int32_t priority;
QTAILQ_HEAD(, MemoryRegion) subregions;
QTAILQ_ENTRY(MemoryRegion) subregions_link;
QTAILQ_HEAD(, CoalescedMemoryRange) coalesced;
const char *name;
unsigned ioeventfd_nb;
MemoryRegionIoeventfd *ioeventfds;
RamDiscardManager *rdm; /* Only for RAM */
};
struct IOMMUMemoryRegion {
MemoryRegion parent_obj;
QLIST_HEAD(, IOMMUNotifier) iommu_notify;
IOMMUNotifierFlag iommu_notify_flags;
};
#define IOMMU_NOTIFIER_FOREACH(n, mr) \
QLIST_FOREACH((n), &(mr)->iommu_notify, node)
/**
* struct MemoryListener: callbacks structure for updates to the physical memory map
*
* Allows a component to adjust to changes in the guest-visible memory map.
* Use with memory_listener_register() and memory_listener_unregister().
*/
struct MemoryListener {
/**
* @begin:
*
* Called at the beginning of an address space update transaction.
* Followed by calls to #MemoryListener.region_add(),
* #MemoryListener.region_del(), #MemoryListener.region_nop(),
* #MemoryListener.log_start() and #MemoryListener.log_stop() in
* increasing address order.
*
* @listener: The #MemoryListener.
*/
void (*begin)(MemoryListener *listener);
/**
* @commit:
*
* Called at the end of an address space update transaction,
* after the last call to #MemoryListener.region_add(),
* #MemoryListener.region_del() or #MemoryListener.region_nop(),
* #MemoryListener.log_start() and #MemoryListener.log_stop().
*
* @listener: The #MemoryListener.
*/
void (*commit)(MemoryListener *listener);
/**
* @region_add:
*
* Called during an address space update transaction,
* for a section of the address space that is new in this address space
* space since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The new #MemoryRegionSection.
*/
void (*region_add)(MemoryListener *listener, MemoryRegionSection *section);
/**
* @region_del:
*
* Called during an address space update transaction,
* for a section of the address space that has disappeared in the address
* space since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The old #MemoryRegionSection.
*/
void (*region_del)(MemoryListener *listener, MemoryRegionSection *section);
/**
* @region_nop:
*
* Called during an address space update transaction,
* for a section of the address space that is in the same place in the address
* space as in the last transaction.
*
* @listener: The #MemoryListener.
* @section: The #MemoryRegionSection.
*/
void (*region_nop)(MemoryListener *listener, MemoryRegionSection *section);
/**
* @log_start:
*
* Called during an address space update transaction, after
* one of #MemoryListener.region_add(), #MemoryListener.region_del() or
* #MemoryListener.region_nop(), if dirty memory logging clients have
* become active since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The #MemoryRegionSection.
* @old: A bitmap of dirty memory logging clients that were active in
* the previous transaction.
* @new: A bitmap of dirty memory logging clients that are active in
* the current transaction.
*/
void (*log_start)(MemoryListener *listener, MemoryRegionSection *section,
int old, int new);
/**
* @log_stop:
*
* Called during an address space update transaction, after
* one of #MemoryListener.region_add(), #MemoryListener.region_del() or
* #MemoryListener.region_nop() and possibly after
* #MemoryListener.log_start(), if dirty memory logging clients have
* become inactive since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The #MemoryRegionSection.
* @old: A bitmap of dirty memory logging clients that were active in
* the previous transaction.
* @new: A bitmap of dirty memory logging clients that are active in
* the current transaction.
*/
void (*log_stop)(MemoryListener *listener, MemoryRegionSection *section,
int old, int new);
/**
* @log_sync:
*
* Called by memory_region_snapshot_and_clear_dirty() and
* memory_global_dirty_log_sync(), before accessing QEMU's "official"
* copy of the dirty memory bitmap for a #MemoryRegionSection.
*
* @listener: The #MemoryListener.
* @section: The #MemoryRegionSection.
*/
void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
/**
* @log_sync_global:
*
* This is the global version of @log_sync when the listener does
* not have a way to synchronize the log with finer granularity.
* When the listener registers with @log_sync_global defined, then
* its @log_sync must be NULL. Vice versa.
*
* @listener: The #MemoryListener.
*/
void (*log_sync_global)(MemoryListener *listener);
/**
* @log_clear:
*
* Called before reading the dirty memory bitmap for a
* #MemoryRegionSection.
*
* @listener: The #MemoryListener.
* @section: The #MemoryRegionSection.
*/
void (*log_clear)(MemoryListener *listener, MemoryRegionSection *section);
/**
* @log_global_start:
*
* Called by memory_global_dirty_log_start(), which
* enables the %DIRTY_LOG_MIGRATION client on all memory regions in
* the address space. #MemoryListener.log_global_start() is also
* called when a #MemoryListener is added, if global dirty logging is
* active at that time.
*
* @listener: The #MemoryListener.
*/
void (*log_global_start)(MemoryListener *listener);
/**
* @log_global_stop:
*
* Called by memory_global_dirty_log_stop(), which
* disables the %DIRTY_LOG_MIGRATION client on all memory regions in
* the address space.
*
* @listener: The #MemoryListener.
*/
void (*log_global_stop)(MemoryListener *listener);
/**
* @log_global_after_sync:
*
* Called after reading the dirty memory bitmap
* for any #MemoryRegionSection.
*
* @listener: The #MemoryListener.
*/
void (*log_global_after_sync)(MemoryListener *listener);
/**
* @eventfd_add:
*
* Called during an address space update transaction,
* for a section of the address space that has had a new ioeventfd
* registration since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The new #MemoryRegionSection.
* @match_data: The @match_data parameter for the new ioeventfd.
* @data: The @data parameter for the new ioeventfd.
* @e: The #EventNotifier parameter for the new ioeventfd.
*/
void (*eventfd_add)(MemoryListener *listener, MemoryRegionSection *section,
bool match_data, uint64_t data, EventNotifier *e);
/**
* @eventfd_del:
*
* Called during an address space update transaction,
* for a section of the address space that has dropped an ioeventfd
* registration since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The new #MemoryRegionSection.
* @match_data: The @match_data parameter for the dropped ioeventfd.
* @data: The @data parameter for the dropped ioeventfd.
* @e: The #EventNotifier parameter for the dropped ioeventfd.
*/
void (*eventfd_del)(MemoryListener *listener, MemoryRegionSection *section,
bool match_data, uint64_t data, EventNotifier *e);
/**
* @coalesced_io_add:
*
* Called during an address space update transaction,
* for a section of the address space that has had a new coalesced
* MMIO range registration since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The new #MemoryRegionSection.
* @addr: The starting address for the coalesced MMIO range.
* @len: The length of the coalesced MMIO range.
*/
void (*coalesced_io_add)(MemoryListener *listener, MemoryRegionSection *section,
hwaddr addr, hwaddr len);
/**
* @coalesced_io_del:
*
* Called during an address space update transaction,
* for a section of the address space that has dropped a coalesced
* MMIO range since the last transaction.
*
* @listener: The #MemoryListener.
* @section: The new #MemoryRegionSection.
* @addr: The starting address for the coalesced MMIO range.
* @len: The length of the coalesced MMIO range.
*/
void (*coalesced_io_del)(MemoryListener *listener, MemoryRegionSection *section,
hwaddr addr, hwaddr len);
/**
* @priority:
*
* Govern the order in which memory listeners are invoked. Lower priorities
* are invoked earlier for "add" or "start" callbacks, and later for "delete"
* or "stop" callbacks.
*/
unsigned priority;
/**
* @name:
*
* Name of the listener. It can be used in contexts where we'd like to
* identify one memory listener with the rest.
*/
const char *name;
/* private: */
AddressSpace *address_space;
QTAILQ_ENTRY(MemoryListener) link;
QTAILQ_ENTRY(MemoryListener) link_as;
};
/**
* struct AddressSpace: describes a mapping of addresses to #MemoryRegion objects
*/
struct AddressSpace {
/* private: */
struct rcu_head rcu;
char *name;
MemoryRegion *root;
/* Accessed via RCU. */
struct FlatView *current_map;
int ioeventfd_nb;
struct MemoryRegionIoeventfd *ioeventfds;
QTAILQ_HEAD(, MemoryListener) listeners;
QTAILQ_ENTRY(AddressSpace) address_spaces_link;
};
typedef struct AddressSpaceDispatch AddressSpaceDispatch;
typedef struct FlatRange FlatRange;
/* Flattened global view of current active memory hierarchy. Kept in sorted
* order.
*/
struct FlatView {
struct rcu_head rcu;
unsigned ref;
FlatRange *ranges;
unsigned nr;
unsigned nr_allocated;
struct AddressSpaceDispatch *dispatch;
MemoryRegion *root;
};
static inline FlatView *address_space_to_flatview(AddressSpace *as)
{
return qatomic_rcu_read(&as->current_map);
}
/**
* typedef flatview_cb: callback for flatview_for_each_range()
*
* @start: start address of the range within the FlatView
* @len: length of the range in bytes
* @mr: MemoryRegion covering this range
* @offset_in_region: offset of the first byte of the range within @mr
* @opaque: data pointer passed to flatview_for_each_range()
*
* Returns: true to stop the iteration, false to keep going.
*/
typedef bool (*flatview_cb)(Int128 start,
Int128 len,
const MemoryRegion *mr,
hwaddr offset_in_region,
void *opaque);
/**
* flatview_for_each_range: Iterate through a FlatView
* @fv: the FlatView to iterate through
* @cb: function to call for each range
* @opaque: opaque data pointer to pass to @cb
*
* A FlatView is made up of a list of non-overlapping ranges, each of
* which is a slice of a MemoryRegion. This function iterates through
* each range in @fv, calling @cb. The callback function can terminate
* iteration early by returning 'true'.
*/
void flatview_for_each_range(FlatView *fv, flatview_cb cb, void *opaque);
static inline bool MemoryRegionSection_eq(MemoryRegionSection *a,
MemoryRegionSection *b)
{
return a->mr == b->mr &&
a->fv == b->fv &&
a->offset_within_region == b->offset_within_region &&
a->offset_within_address_space == b->offset_within_address_space &&
int128_eq(a->size, b->size) &&
a->readonly == b->readonly &&
a->nonvolatile == b->nonvolatile;
}
/**
* memory_region_section_new_copy: Copy a memory region section
*
* Allocate memory for a new copy, copy the memory region section, and
* properly take a reference on all relevant members.
*
* @s: the #MemoryRegionSection to copy
*/
MemoryRegionSection *memory_region_section_new_copy(MemoryRegionSection *s);
/**
* memory_region_section_new_copy: Free a copied memory region section
*
* Free a copy of a memory section created via memory_region_section_new_copy().
* properly dropping references on all relevant members.
*
* @s: the #MemoryRegionSection to copy
*/
void memory_region_section_free_copy(MemoryRegionSection *s);
/**
* memory_region_init: Initialize a memory region
*
* The region typically acts as a container for other memory regions. Use
* memory_region_add_subregion() to add subregions.
*
* @mr: the #MemoryRegion to be initialized
* @owner: the object that tracks the region's reference count
* @name: used for debugging; not visible to the user or ABI
* @size: size of the region; any subregions beyond this size will be clipped
*/
void memory_region_init(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size);
/**
* memory_region_ref: Add 1 to a memory region's reference count
*
* Whenever memory regions are accessed outside the BQL, they need to be
* preserved against hot-unplug. MemoryRegions actually do not have their
* own reference count; they piggyback on a QOM object, their "owner".
* This function adds a reference to the owner.
*
* All MemoryRegions must have an owner if they can disappear, even if the
* device they belong to operates exclusively under the BQL. This is because
* the region could be returned at any time by memory_region_find, and this
* is usually under guest control.
*
* @mr: the #MemoryRegion
*/
void memory_region_ref(MemoryRegion *mr);
/**
* memory_region_unref: Remove 1 to a memory region's reference count
*
* Whenever memory regions are accessed outside the BQL, they need to be
* preserved against hot-unplug. MemoryRegions actually do not have their
* own reference count; they piggyback on a QOM object, their "owner".
* This function removes a reference to the owner and possibly destroys it.
*
* @mr: the #MemoryRegion
*/
void memory_region_unref(MemoryRegion *mr);
/**
* memory_region_init_io: Initialize an I/O memory region.
*
* Accesses into the region will cause the callbacks in @ops to be called.
* if @size is nonzero, subregions will be clipped to @size.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @ops: a structure containing read and write callbacks to be used when
* I/O is performed on the region.
* @opaque: passed to the read and write callbacks of the @ops structure.
* @name: used for debugging; not visible to the user or ABI
* @size: size of the region.
*/
void memory_region_init_io(MemoryRegion *mr,
Object *owner,
const MemoryRegionOps *ops,
void *opaque,
const char *name,
uint64_t size);
/**
* memory_region_init_ram_nomigrate: Initialize RAM memory region. Accesses
* into the region will modify memory
* directly.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @errp: pointer to Error*, to store an error if it happens.
*
* Note that this function does not do anything to cause the data in the
* RAM memory region to be migrated; that is the responsibility of the caller.
*/
void memory_region_init_ram_nomigrate(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
Error **errp);
/**
* memory_region_init_ram_flags_nomigrate: Initialize RAM memory region.
* Accesses into the region will
* modify memory directly.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_NORESERVE.
* @errp: pointer to Error*, to store an error if it happens.
*
* Note that this function does not do anything to cause the data in the
* RAM memory region to be migrated; that is the responsibility of the caller.
*/
void memory_region_init_ram_flags_nomigrate(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
uint32_t ram_flags,
Error **errp);
/**
* memory_region_init_resizeable_ram: Initialize memory region with resizeable
* RAM. Accesses into the region will
* modify memory directly. Only an initial
* portion of this RAM is actually used.
* Changing the size while migrating
* can result in the migration being
* canceled.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: used size of the region.
* @max_size: max size of the region.
* @resized: callback to notify owner about used size change.
* @errp: pointer to Error*, to store an error if it happens.
*
* Note that this function does not do anything to cause the data in the
* RAM memory region to be migrated; that is the responsibility of the caller.
*/
void memory_region_init_resizeable_ram(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
uint64_t max_size,
void (*resized)(const char*,
uint64_t length,
void *host),
Error **errp);
#ifdef CONFIG_POSIX
/**
* memory_region_init_ram_from_file: Initialize RAM memory region with a
* mmap-ed backend.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @align: alignment of the region base address; if 0, the default alignment
* (getpagesize()) will be used.
* @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM,
* RAM_NORESERVE,
* @path: the path in which to allocate the RAM.
* @readonly: true to open @path for reading, false for read/write.
* @errp: pointer to Error*, to store an error if it happens.
*
* Note that this function does not do anything to cause the data in the
* RAM memory region to be migrated; that is the responsibility of the caller.
*/
void memory_region_init_ram_from_file(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
uint64_t align,
uint32_t ram_flags,
const char *path,
bool readonly,
Error **errp);
/**
* memory_region_init_ram_from_fd: Initialize RAM memory region with a
* mmap-ed backend.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: the name of the region.
* @size: size of the region.
* @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM,
* RAM_NORESERVE, RAM_PROTECTED.
* @fd: the fd to mmap.
* @offset: offset within the file referenced by fd
* @errp: pointer to Error*, to store an error if it happens.
*
* Note that this function does not do anything to cause the data in the
* RAM memory region to be migrated; that is the responsibility of the caller.
*/
void memory_region_init_ram_from_fd(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
uint32_t ram_flags,
int fd,
ram_addr_t offset,
Error **errp);
#endif
/**
* memory_region_init_ram_ptr: Initialize RAM memory region from a
* user-provided pointer. Accesses into the
* region will modify memory directly.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @ptr: memory to be mapped; must contain at least @size bytes.
*
* Note that this function does not do anything to cause the data in the
* RAM memory region to be migrated; that is the responsibility of the caller.
*/
void memory_region_init_ram_ptr(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
void *ptr);
/**
* memory_region_init_ram_device_ptr: Initialize RAM device memory region from
* a user-provided pointer.
*
* A RAM device represents a mapping to a physical device, such as to a PCI
* MMIO BAR of an vfio-pci assigned device. The memory region may be mapped
* into the VM address space and access to the region will modify memory
* directly. However, the memory region should not be included in a memory
* dump (device may not be enabled/mapped at the time of the dump), and
* operations incompatible with manipulating MMIO should be avoided. Replaces
* skip_dump flag.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: the name of the region.
* @size: size of the region.
* @ptr: memory to be mapped; must contain at least @size bytes.
*
* Note that this function does not do anything to cause the data in the
* RAM memory region to be migrated; that is the responsibility of the caller.
* (For RAM device memory regions, migrating the contents rarely makes sense.)
*/
void memory_region_init_ram_device_ptr(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
void *ptr);
/**
* memory_region_init_alias: Initialize a memory region that aliases all or a
* part of another memory region.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: used for debugging; not visible to the user or ABI
* @orig: the region to be referenced; @mr will be equivalent to
* @orig between @offset and @offset + @size - 1.
* @offset: start of the section in @orig to be referenced.
* @size: size of the region.
*/
void memory_region_init_alias(MemoryRegion *mr,
Object *owner,
const char *name,
MemoryRegion *orig,
hwaddr offset,
uint64_t size);
/**
* memory_region_init_rom_nomigrate: Initialize a ROM memory region.
*
* This has the same effect as calling memory_region_init_ram_nomigrate()
* and then marking the resulting region read-only with
* memory_region_set_readonly().
*
* Note that this function does not do anything to cause the data in the
* RAM side of the memory region to be migrated; that is the responsibility
* of the caller.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @errp: pointer to Error*, to store an error if it happens.
*/
void memory_region_init_rom_nomigrate(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
Error **errp);
/**
* memory_region_init_rom_device_nomigrate: Initialize a ROM memory region.
* Writes are handled via callbacks.
*
* Note that this function does not do anything to cause the data in the
* RAM side of the memory region to be migrated; that is the responsibility
* of the caller.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @ops: callbacks for write access handling (must not be NULL).
* @opaque: passed to the read and write callbacks of the @ops structure.
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @errp: pointer to Error*, to store an error if it happens.
*/
void memory_region_init_rom_device_nomigrate(MemoryRegion *mr,
Object *owner,
const MemoryRegionOps *ops,
void *opaque,
const char *name,
uint64_t size,
Error **errp);
/**
* memory_region_init_iommu: Initialize a memory region of a custom type
* that translates addresses
*
* An IOMMU region translates addresses and forwards accesses to a target
* memory region.
*
* The IOMMU implementation must define a subclass of TYPE_IOMMU_MEMORY_REGION.
* @_iommu_mr should be a pointer to enough memory for an instance of
* that subclass, @instance_size is the size of that subclass, and
* @mrtypename is its name. This function will initialize @_iommu_mr as an
* instance of the subclass, and its methods will then be called to handle
* accesses to the memory region. See the documentation of
* #IOMMUMemoryRegionClass for further details.
*
* @_iommu_mr: the #IOMMUMemoryRegion to be initialized
* @instance_size: the IOMMUMemoryRegion subclass instance size
* @mrtypename: the type name of the #IOMMUMemoryRegion
* @owner: the object that tracks the region's reference count
* @name: used for debugging; not visible to the user or ABI
* @size: size of the region.
*/
void memory_region_init_iommu(void *_iommu_mr,
size_t instance_size,
const char *mrtypename,
Object *owner,
const char *name,
uint64_t size);
/**
* memory_region_init_ram - Initialize RAM memory region. Accesses into the
* region will modify memory directly.
*
* @mr: the #MemoryRegion to be initialized
* @owner: the object that tracks the region's reference count (must be
* TYPE_DEVICE or a subclass of TYPE_DEVICE, or NULL)
* @name: name of the memory region
* @size: size of the region in bytes
* @errp: pointer to Error*, to store an error if it happens.
*
* This function allocates RAM for a board model or device, and
* arranges for it to be migrated (by calling vmstate_register_ram()
* if @owner is a DeviceState, or vmstate_register_ram_global() if
* @owner is NULL).
*
* TODO: Currently we restrict @owner to being either NULL (for
* global RAM regions with no owner) or devices, so that we can
* give the RAM block a unique name for migration purposes.
* We should lift this restriction and allow arbitrary Objects.
* If you pass a non-NULL non-device @owner then we will assert.
*/
void memory_region_init_ram(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
Error **errp);
/**
* memory_region_init_rom: Initialize a ROM memory region.
*
* This has the same effect as calling memory_region_init_ram()
* and then marking the resulting region read-only with
* memory_region_set_readonly(). This includes arranging for the
* contents to be migrated.
*
* TODO: Currently we restrict @owner to being either NULL (for
* global RAM regions with no owner) or devices, so that we can
* give the RAM block a unique name for migration purposes.
* We should lift this restriction and allow arbitrary Objects.
* If you pass a non-NULL non-device @owner then we will assert.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @errp: pointer to Error*, to store an error if it happens.
*/
void memory_region_init_rom(MemoryRegion *mr,
Object *owner,
const char *name,
uint64_t size,
Error **errp);
/**
* memory_region_init_rom_device: Initialize a ROM memory region.
* Writes are handled via callbacks.
*
* This function initializes a memory region backed by RAM for reads
* and callbacks for writes, and arranges for the RAM backing to
* be migrated (by calling vmstate_register_ram()
* if @owner is a DeviceState, or vmstate_register_ram_global() if
* @owner is NULL).
*
* TODO: Currently we restrict @owner to being either NULL (for
* global RAM regions with no owner) or devices, so that we can
* give the RAM block a unique name for migration purposes.
* We should lift this restriction and allow arbitrary Objects.
* If you pass a non-NULL non-device @owner then we will assert.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @ops: callbacks for write access handling (must not be NULL).
* @opaque: passed to the read and write callbacks of the @ops structure.
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @errp: pointer to Error*, to store an error if it happens.
*/
void memory_region_init_rom_device(MemoryRegion *mr,
Object *owner,
const MemoryRegionOps *ops,
void *opaque,
const char *name,
uint64_t size,
Error **errp);
/**
* memory_region_owner: get a memory region's owner.
*
* @mr: the memory region being queried.
*/
Object *memory_region_owner(MemoryRegion *mr);
/**
* memory_region_size: get a memory region's size.
*
* @mr: the memory region being queried.
*/
uint64_t memory_region_size(MemoryRegion *mr);
/**
* memory_region_is_ram: check whether a memory region is random access
*
* Returns %true if a memory region is random access.
*
* @mr: the memory region being queried
*/
static inline bool memory_region_is_ram(MemoryRegion *mr)
{
return mr->ram;
}
/**
* memory_region_is_ram_device: check whether a memory region is a ram device
*
* Returns %true if a memory region is a device backed ram region
*
* @mr: the memory region being queried
*/
bool memory_region_is_ram_device(MemoryRegion *mr);
/**
* memory_region_is_romd: check whether a memory region is in ROMD mode
*
* Returns %true if a memory region is a ROM device and currently set to allow
* direct reads.
*
* @mr: the memory region being queried
*/
static inline bool memory_region_is_romd(MemoryRegion *mr)
{
return mr->rom_device && mr->romd_mode;
}
/**
* memory_region_is_protected: check whether a memory region is protected
*
* Returns %true if a memory region is protected RAM and cannot be accessed
* via standard mechanisms, e.g. DMA.
*
* @mr: the memory region being queried
*/
bool memory_region_is_protected(MemoryRegion *mr);
/**
* memory_region_get_iommu: check whether a memory region is an iommu
*
* Returns pointer to IOMMUMemoryRegion if a memory region is an iommu,
* otherwise NULL.
*
* @mr: the memory region being queried
*/
static inline IOMMUMemoryRegion *memory_region_get_iommu(MemoryRegion *mr)
{
if (mr->alias) {
return memory_region_get_iommu(mr->alias);
}
if (mr->is_iommu) {
return (IOMMUMemoryRegion *) mr;
}
return NULL;
}
/**
* memory_region_get_iommu_class_nocheck: returns iommu memory region class
* if an iommu or NULL if not
*
* Returns pointer to IOMMUMemoryRegionClass if a memory region is an iommu,
* otherwise NULL. This is fast path avoiding QOM checking, use with caution.
*
* @iommu_mr: the memory region being queried
*/
static inline IOMMUMemoryRegionClass *memory_region_get_iommu_class_nocheck(
IOMMUMemoryRegion *iommu_mr)
{
return (IOMMUMemoryRegionClass *) (((Object *)iommu_mr)->class);
}
#define memory_region_is_iommu(mr) (memory_region_get_iommu(mr) != NULL)
/**
* memory_region_iommu_get_min_page_size: get minimum supported page size
* for an iommu
*
* Returns minimum supported page size for an iommu.
*
* @iommu_mr: the memory region being queried
*/
uint64_t memory_region_iommu_get_min_page_size(IOMMUMemoryRegion *iommu_mr);
/**
* memory_region_notify_iommu: notify a change in an IOMMU translation entry.
*
* Note: for any IOMMU implementation, an in-place mapping change
* should be notified with an UNMAP followed by a MAP.
*
* @iommu_mr: the memory region that was changed
* @iommu_idx: the IOMMU index for the translation table which has changed
* @event: TLB event with the new entry in the IOMMU translation table.
* The entry replaces all old entries for the same virtual I/O address
* range.
*/
void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
int iommu_idx,
IOMMUTLBEvent event);
/**
* memory_region_notify_iommu_one: notify a change in an IOMMU translation
* entry to a single notifier
*
* This works just like memory_region_notify_iommu(), but it only
* notifies a specific notifier, not all of them.
*
* @notifier: the notifier to be notified
* @event: TLB event with the new entry in the IOMMU translation table.
* The entry replaces all old entries for the same virtual I/O address
* range.
*/
void memory_region_notify_iommu_one(IOMMUNotifier *notifier,
IOMMUTLBEvent *event);
/**
* memory_region_register_iommu_notifier: register a notifier for changes to
* IOMMU translation entries.
*
* Returns 0 on success, or a negative errno otherwise. In particular,
* -EINVAL indicates that at least one of the attributes of the notifier
* is not supported (flag/range) by the IOMMU memory region. In case of error
* the error object must be created.
*
* @mr: the memory region to observe
* @n: the IOMMUNotifier to be added; the notify callback receives a
* pointer to an #IOMMUTLBEntry as the opaque value; the pointer
* ceases to be valid on exit from the notifier.
* @errp: pointer to Error*, to store an error if it happens.
*/
int memory_region_register_iommu_notifier(MemoryRegion *mr,
IOMMUNotifier *n, Error **errp);
/**
* memory_region_iommu_replay: replay existing IOMMU translations to
* a notifier with the minimum page granularity returned by
* mr->iommu_ops->get_page_size().
*
* Note: this is not related to record-and-replay functionality.
*
* @iommu_mr: the memory region to observe
* @n: the notifier to which to replay iommu mappings
*/
void memory_region_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n);
/**
* memory_region_unregister_iommu_notifier: unregister a notifier for
* changes to IOMMU translation entries.
*
* @mr: the memory region which was observed and for which notity_stopped()
* needs to be called
* @n: the notifier to be removed.
*/
void memory_region_unregister_iommu_notifier(MemoryRegion *mr,
IOMMUNotifier *n);
/**
* memory_region_iommu_get_attr: return an IOMMU attr if get_attr() is
* defined on the IOMMU.
*
* Returns 0 on success, or a negative errno otherwise. In particular,
* -EINVAL indicates that the IOMMU does not support the requested
* attribute.
*
* @iommu_mr: the memory region
* @attr: the requested attribute
* @data: a pointer to the requested attribute data
*/
int memory_region_iommu_get_attr(IOMMUMemoryRegion *iommu_mr,
enum IOMMUMemoryRegionAttr attr,
void *data);
/**
* memory_region_iommu_attrs_to_index: return the IOMMU index to
* use for translations with the given memory transaction attributes.
*
* @iommu_mr: the memory region
* @attrs: the memory transaction attributes
*/
int memory_region_iommu_attrs_to_index(IOMMUMemoryRegion *iommu_mr,
MemTxAttrs attrs);
/**
* memory_region_iommu_num_indexes: return the total number of IOMMU
* indexes that this IOMMU supports.
*
* @iommu_mr: the memory region
*/
int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr);
/**
* memory_region_iommu_set_page_size_mask: set the supported page
* sizes for a given IOMMU memory region
*
* @iommu_mr: IOMMU memory region
* @page_size_mask: supported page size mask
* @errp: pointer to Error*, to store an error if it happens.
*/
int memory_region_iommu_set_page_size_mask(IOMMUMemoryRegion *iommu_mr,
uint64_t page_size_mask,
Error **errp);
/**
* memory_region_name: get a memory region's name
*
* Returns the string that was used to initialize the memory region.
*
* @mr: the memory region being queried
*/
const char *memory_region_name(const MemoryRegion *mr);
/**
* memory_region_is_logging: return whether a memory region is logging writes
*
* Returns %true if the memory region is logging writes for the given client
*
* @mr: the memory region being queried
* @client: the client being queried
*/
bool memory_region_is_logging(MemoryRegion *mr, uint8_t client);
/**
* memory_region_get_dirty_log_mask: return the clients for which a
* memory region is logging writes.
*
* Returns a bitmap of clients, in which the DIRTY_MEMORY_* constants
* are the bit indices.
*
* @mr: the memory region being queried
*/
uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr);
/**
* memory_region_is_rom: check whether a memory region is ROM
*
* Returns %true if a memory region is read-only memory.
*
* @mr: the memory region being queried
*/
static inline bool memory_region_is_rom(MemoryRegion *mr)
{
return mr->ram && mr->readonly;
}
/**
* memory_region_is_nonvolatile: check whether a memory region is non-volatile
*
* Returns %true is a memory region is non-volatile memory.
*
* @mr: the memory region being queried
*/
static inline bool memory_region_is_nonvolatile(MemoryRegion *mr)
{
return mr->nonvolatile;
}
/**
* memory_region_get_fd: Get a file descriptor backing a RAM memory region.
*
* Returns a file descriptor backing a file-based RAM memory region,
* or -1 if the region is not a file-based RAM memory region.
*
* @mr: the RAM or alias memory region being queried.
*/
int memory_region_get_fd(MemoryRegion *mr);
/**
* memory_region_from_host: Convert a pointer into a RAM memory region
* and an offset within it.
*
* Given a host pointer inside a RAM memory region (created with
* memory_region_init_ram() or memory_region_init_ram_ptr()), return
* the MemoryRegion and the offset within it.
*
* Use with care; 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.
*
* @ptr: the host pointer to be converted
* @offset: the offset within memory region
*/
MemoryRegion *memory_region_from_host(void *ptr, ram_addr_t *offset);
/**
* memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
*
* Returns a host pointer to a RAM memory region (created with
* memory_region_init_ram() or memory_region_init_ram_ptr()).
*
* Use with care; 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.
*
* @mr: the memory region being queried.
*/
void *memory_region_get_ram_ptr(MemoryRegion *mr);
/* memory_region_ram_resize: Resize a RAM region.
*
* Resizing RAM while migrating can result in the migration being canceled.
* Care has to be taken if the guest might have already detected the memory.
*
* @mr: a memory region created with @memory_region_init_resizeable_ram.
* @newsize: the new size the region
* @errp: pointer to Error*, to store an error if it happens.
*/
void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize,
Error **errp);
/**
* memory_region_msync: Synchronize selected address range of
* a memory mapped region
*
* @mr: the memory region to be msync
* @addr: the initial address of the range to be sync
* @size: the size of the range to be sync
*/
void memory_region_msync(MemoryRegion *mr, hwaddr addr, hwaddr size);
/**
* memory_region_writeback: Trigger cache writeback for
* selected address range
*
* @mr: the memory region to be updated
* @addr: the initial address of the range to be written back
* @size: the size of the range to be written back
*/
void memory_region_writeback(MemoryRegion *mr, hwaddr addr, hwaddr size);
/**
* memory_region_set_log: Turn dirty logging on or off for a region.
*
* Turns dirty logging on or off for a specified client (display, migration).
* Only meaningful for RAM regions.
*
* @mr: the memory region being updated.
* @log: whether dirty logging is to be enabled or disabled.
* @client: the user of the logging information; %DIRTY_MEMORY_VGA only.
*/
void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client);
/**
* memory_region_set_dirty: Mark a range of bytes as dirty in a memory region.
*
* Marks a range of bytes as dirty, after it has been dirtied outside
* guest code.
*
* @mr: the memory region being dirtied.
* @addr: the address (relative to the start of the region) being dirtied.
* @size: size of the range being dirtied.
*/
void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
hwaddr size);
/**
* memory_region_clear_dirty_bitmap - clear dirty bitmap for memory range
*
* This function is called when the caller wants to clear the remote
* dirty bitmap of a memory range within the memory region. This can
* be used by e.g. KVM to manually clear dirty log when
* KVM_CAP_MANUAL_DIRTY_LOG_PROTECT is declared support by the host
* kernel.
*
* @mr: the memory region to clear the dirty log upon
* @start: start address offset within the memory region
* @len: length of the memory region to clear dirty bitmap
*/
void memory_region_clear_dirty_bitmap(MemoryRegion *mr, hwaddr start,
hwaddr len);
/**
* memory_region_snapshot_and_clear_dirty: Get a snapshot of the dirty
* bitmap and clear it.
*
* Creates a snapshot of the dirty bitmap, clears the dirty bitmap and
* returns the snapshot. The snapshot can then be used to query dirty
* status, using memory_region_snapshot_get_dirty. Snapshotting allows
* querying the same page multiple times, which is especially useful for
* display updates where the scanlines often are not page aligned.
*
* The dirty bitmap region which gets copyed into the snapshot (and
* cleared afterwards) can be larger than requested. The boundaries
* are rounded up/down so complete bitmap longs (covering 64 pages on
* 64bit hosts) can be copied over into the bitmap snapshot. Which
* isn't a problem for display updates as the extra pages are outside
* the visible area, and in case the visible area changes a full
* display redraw is due anyway. Should other use cases for this
* function emerge we might have to revisit this implementation
* detail.
*
* Use g_free to release DirtyBitmapSnapshot.
*
* @mr: the memory region being queried.
* @addr: the address (relative to the start of the region) being queried.
* @size: the size of the range being queried.
* @client: the user of the logging information; typically %DIRTY_MEMORY_VGA.
*/
DirtyBitmapSnapshot *memory_region_snapshot_and_clear_dirty(MemoryRegion *mr,
hwaddr addr,
hwaddr size,
unsigned client);
/**
* memory_region_snapshot_get_dirty: Check whether a range of bytes is dirty
* in the specified dirty bitmap snapshot.
*
* @mr: the memory region being queried.
* @snap: the dirty bitmap snapshot
* @addr: the address (relative to the start of the region) being queried.
* @size: the size of the range being queried.
*/
bool memory_region_snapshot_get_dirty(MemoryRegion *mr,
DirtyBitmapSnapshot *snap,
hwaddr addr, hwaddr size);
/**
* memory_region_reset_dirty: Mark a range of pages as clean, for a specified
* client.
*
* Marks a range of pages as no longer dirty.
*
* @mr: the region being updated.
* @addr: the start of the subrange being cleaned.
* @size: the size of the subrange being cleaned.
* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
* %DIRTY_MEMORY_VGA.
*/
void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
hwaddr size, unsigned client);
/**
* memory_region_flush_rom_device: Mark a range of pages dirty and invalidate
* TBs (for self-modifying code).
*
* The MemoryRegionOps->write() callback of a ROM device must use this function
* to mark byte ranges that have been modified internally, such as by directly
* accessing the memory returned by memory_region_get_ram_ptr().
*
* This function marks the range dirty and invalidates TBs so that TCG can
* detect self-modifying code.
*
* @mr: the region being flushed.
* @addr: the start, relative to the start of the region, of the range being
* flushed.
* @size: the size, in bytes, of the range being flushed.
*/
void memory_region_flush_rom_device(MemoryRegion *mr, hwaddr addr, hwaddr size);
/**
* memory_region_set_readonly: Turn a memory region read-only (or read-write)
*
* Allows a memory region to be marked as read-only (turning it into a ROM).
* only useful on RAM regions.
*
* @mr: the region being updated.
* @readonly: whether rhe region is to be ROM or RAM.
*/
void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
/**
* memory_region_set_nonvolatile: Turn a memory region non-volatile
*
* Allows a memory region to be marked as non-volatile.
* only useful on RAM regions.
*
* @mr: the region being updated.
* @nonvolatile: whether rhe region is to be non-volatile.
*/
void memory_region_set_nonvolatile(MemoryRegion *mr, bool nonvolatile);
/**
* memory_region_rom_device_set_romd: enable/disable ROMD mode
*
* Allows a ROM device (initialized with memory_region_init_rom_device() to
* set to ROMD mode (default) or MMIO mode. When it is in ROMD mode, the
* device is mapped to guest memory and satisfies read access directly.
* When in MMIO mode, reads are forwarded to the #MemoryRegion.read function.
* Writes are always handled by the #MemoryRegion.write function.
*
* @mr: the memory region to be updated
* @romd_mode: %true to put the region into ROMD mode
*/
void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode);
/**
* memory_region_set_coalescing: Enable memory coalescing for the region.
*
* Enabled writes to a region to be queued for later processing. MMIO ->write
* callbacks may be delayed until a non-coalesced MMIO is issued.
* Only useful for IO regions. Roughly similar to write-combining hardware.
*
* @mr: the memory region to be write coalesced
*/
void memory_region_set_coalescing(MemoryRegion *mr);
/**
* memory_region_add_coalescing: Enable memory coalescing for a sub-range of
* a region.
*
* Like memory_region_set_coalescing(), but works on a sub-range of a region.
* Multiple calls can be issued coalesced disjoint ranges.
*
* @mr: the memory region to be updated.
* @offset: the start of the range within the region to be coalesced.
* @size: the size of the subrange to be coalesced.
*/
void memory_region_add_coalescing(MemoryRegion *mr,
hwaddr offset,
uint64_t size);
/**
* memory_region_clear_coalescing: Disable MMIO coalescing for the region.
*
* Disables any coalescing caused by memory_region_set_coalescing() or
* memory_region_add_coalescing(). Roughly equivalent to uncacheble memory
* hardware.
*
* @mr: the memory region to be updated.
*/
void memory_region_clear_coalescing(MemoryRegion *mr);
/**
* memory_region_set_flush_coalesced: Enforce memory coalescing flush before
* accesses.
*
* Ensure that pending coalesced MMIO request are flushed before the memory
* region is accessed. This property is automatically enabled for all regions
* passed to memory_region_set_coalescing() and memory_region_add_coalescing().
*
* @mr: the memory region to be updated.
*/
void memory_region_set_flush_coalesced(MemoryRegion *mr);
/**
* memory_region_clear_flush_coalesced: Disable memory coalescing flush before
* accesses.
*
* Clear the automatic coalesced MMIO flushing enabled via
* memory_region_set_flush_coalesced. Note that this service has no effect on
* memory regions that have MMIO coalescing enabled for themselves. For them,
* automatic flushing will stop once coalescing is disabled.
*
* @mr: the memory region to be updated.
*/
void memory_region_clear_flush_coalesced(MemoryRegion *mr);
/**
* memory_region_add_eventfd: Request an eventfd to be triggered when a word
* is written to a location.
*
* Marks a word in an IO region (initialized with memory_region_init_io())
* as a trigger for an eventfd event. The I/O callback will not be called.
* The caller must be prepared to handle failure (that is, take the required
* action if the callback _is_ called).
*
* @mr: the memory region being updated.
* @addr: the address within @mr that is to be monitored
* @size: the size of the access to trigger the eventfd
* @match_data: whether to match against @data, instead of just @addr
* @data: the data to match against the guest write
* @e: event notifier to be triggered when @addr, @size, and @data all match.
**/
void memory_region_add_eventfd(MemoryRegion *mr,
hwaddr addr,
unsigned size,
bool match_data,
uint64_t data,
EventNotifier *e);
/**
* memory_region_del_eventfd: Cancel an eventfd.
*
* Cancels an eventfd trigger requested by a previous
* memory_region_add_eventfd() call.
*
* @mr: the memory region being updated.
* @addr: the address within @mr that is to be monitored
* @size: the size of the access to trigger the eventfd
* @match_data: whether to match against @data, instead of just @addr
* @data: the data to match against the guest write
* @e: event notifier to be triggered when @addr, @size, and @data all match.
*/
void memory_region_del_eventfd(MemoryRegion *mr,
hwaddr addr,
unsigned size,
bool match_data,
uint64_t data,
EventNotifier *e);
/**
* memory_region_add_subregion: Add a subregion to a container.
*
* Adds a subregion at @offset. The subregion may not overlap with other
* subregions (except for those explicitly marked as overlapping). A region
* may only be added once as a subregion (unless removed with
* memory_region_del_subregion()); use memory_region_init_alias() if you
* want a region to be a subregion in multiple locations.
*
* @mr: the region to contain the new subregion; must be a container
* initialized with memory_region_init().
* @offset: the offset relative to @mr where @subregion is added.
* @subregion: the subregion to be added.
*/
void memory_region_add_subregion(MemoryRegion *mr,
hwaddr offset,
MemoryRegion *subregion);
/**
* memory_region_add_subregion_overlap: Add a subregion to a container
* with overlap.
*
* Adds a subregion at @offset. The subregion may overlap with other
* subregions. Conflicts are resolved by having a higher @priority hide a
* lower @priority. Subregions without priority are taken as @priority 0.
* A region may only be added once as a subregion (unless removed with
* memory_region_del_subregion()); use memory_region_init_alias() if you
* want a region to be a subregion in multiple locations.
*
* @mr: the region to contain the new subregion; must be a container
* initialized with memory_region_init().
* @offset: the offset relative to @mr where @subregion is added.
* @subregion: the subregion to be added.
* @priority: used for resolving overlaps; highest priority wins.
*/
void memory_region_add_subregion_overlap(MemoryRegion *mr,
hwaddr offset,
MemoryRegion *subregion,
int priority);
/**
* memory_region_get_ram_addr: Get the ram address associated with a memory
* region
*
* @mr: the region to be queried
*/
ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr);
uint64_t memory_region_get_alignment(const MemoryRegion *mr);
/**
* memory_region_del_subregion: Remove a subregion.
*
* Removes a subregion from its container.
*
* @mr: the container to be updated.
* @subregion: the region being removed; must be a current subregion of @mr.
*/
void memory_region_del_subregion(MemoryRegion *mr,
MemoryRegion *subregion);
/*
* memory_region_set_enabled: dynamically enable or disable a region
*
* Enables or disables a memory region. A disabled memory region
* ignores all accesses to itself and its subregions. It does not
* obscure sibling subregions with lower priority - it simply behaves as
* if it was removed from the hierarchy.
*
* Regions default to being enabled.
*
* @mr: the region to be updated
* @enabled: whether to enable or disable the region
*/
void memory_region_set_enabled(MemoryRegion *mr, bool enabled);
/*
* memory_region_set_address: dynamically update the address of a region
*
* Dynamically updates the address of a region, relative to its container.
* May be used on regions are currently part of a memory hierarchy.
*
* @mr: the region to be updated
* @addr: new address, relative to container region
*/
void memory_region_set_address(MemoryRegion *mr, hwaddr addr);
/*
* memory_region_set_size: dynamically update the size of a region.
*
* Dynamically updates the size of a region.
*
* @mr: the region to be updated
* @size: used size of the region.
*/
void memory_region_set_size(MemoryRegion *mr, uint64_t size);
/*
* memory_region_set_alias_offset: dynamically update a memory alias's offset
*
* Dynamically updates the offset into the target region that an alias points
* to, as if the fourth argument to memory_region_init_alias() has changed.
*
* @mr: the #MemoryRegion to be updated; should be an alias.
* @offset: the new offset into the target memory region
*/
void memory_region_set_alias_offset(MemoryRegion *mr,
hwaddr offset);
/**
* memory_region_present: checks if an address relative to a @container
* translates into #MemoryRegion within @container
*
* Answer whether a #MemoryRegion within @container covers the address
* @addr.
*
* @container: a #MemoryRegion within which @addr is a relative address
* @addr: the area within @container to be searched
*/
bool memory_region_present(MemoryRegion *container, hwaddr addr);
/**
* memory_region_is_mapped: returns true if #MemoryRegion is mapped
* into another memory region, which does not necessarily imply that it is
* mapped into an address space.
*
* @mr: a #MemoryRegion which should be checked if it's mapped
*/
bool memory_region_is_mapped(MemoryRegion *mr);
/**
* memory_region_get_ram_discard_manager: get the #RamDiscardManager for a
* #MemoryRegion
*
* The #RamDiscardManager cannot change while a memory region is mapped.
*
* @mr: the #MemoryRegion
*/
RamDiscardManager *memory_region_get_ram_discard_manager(MemoryRegion *mr);
/**
* memory_region_has_ram_discard_manager: check whether a #MemoryRegion has a
* #RamDiscardManager assigned
*
* @mr: the #MemoryRegion
*/
static inline bool memory_region_has_ram_discard_manager(MemoryRegion *mr)
{
return !!memory_region_get_ram_discard_manager(mr);
}
/**
* memory_region_set_ram_discard_manager: set the #RamDiscardManager for a
* #MemoryRegion
*
* This function must not be called for a mapped #MemoryRegion, a #MemoryRegion
* that does not cover RAM, or a #MemoryRegion that already has a
* #RamDiscardManager assigned.
*
* @mr: the #MemoryRegion
* @rdm: #RamDiscardManager to set
*/
void memory_region_set_ram_discard_manager(MemoryRegion *mr,
RamDiscardManager *rdm);
/**
* memory_region_find: translate an address/size relative to a
* MemoryRegion into a #MemoryRegionSection.
*
* Locates the first #MemoryRegion within @mr that overlaps the range
* given by @addr and @size.
*
* Returns a #MemoryRegionSection that describes a contiguous overlap.
* It will have the following characteristics:
* - @size = 0 iff no overlap was found
* - @mr is non-%NULL iff an overlap was found
*
* Remember that in the return value the @offset_within_region is
* relative to the returned region (in the .@mr field), not to the
* @mr argument.
*
* Similarly, the .@offset_within_address_space is relative to the
* address space that contains both regions, the passed and the
* returned one. However, in the special case where the @mr argument
* has no container (and thus is the root of the address space), the
* following will hold:
* - @offset_within_address_space >= @addr
* - @offset_within_address_space + .@size <= @addr + @size
*
* @mr: a MemoryRegion within which @addr is a relative address
* @addr: start of the area within @as to be searched
* @size: size of the area to be searched
*/
MemoryRegionSection memory_region_find(MemoryRegion *mr,
hwaddr addr, uint64_t size);
/**
* memory_global_dirty_log_sync: synchronize the dirty log for all memory
*
* Synchronizes the dirty page log for all address spaces.
*/
void memory_global_dirty_log_sync(void);
/**
* memory_global_dirty_log_sync: synchronize the dirty log for all memory
*
* Synchronizes the vCPUs with a thread that is reading the dirty bitmap.
* This function must be called after the dirty log bitmap is cleared, and
* before dirty guest memory pages are read. If you are using
* #DirtyBitmapSnapshot, memory_region_snapshot_and_clear_dirty() takes
* care of doing this.
*/
void memory_global_after_dirty_log_sync(void);
/**
* memory_region_transaction_begin: Start a transaction.
*
* During a transaction, changes will be accumulated and made visible
* only when the transaction ends (is committed).
*/
void memory_region_transaction_begin(void);
/**
* memory_region_transaction_commit: Commit a transaction and make changes
* visible to the guest.
*/
void memory_region_transaction_commit(void);
/**
* memory_listener_register: register callbacks to be called when memory
* sections are mapped or unmapped into an address
* space
*
* @listener: an object containing the callbacks to be called
* @filter: if non-%NULL, only regions in this address space will be observed
*/
void memory_listener_register(MemoryListener *listener, AddressSpace *filter);
/**
* memory_listener_unregister: undo the effect of memory_listener_register()
*
* @listener: an object containing the callbacks to be removed
*/
void memory_listener_unregister(MemoryListener *listener);
/**
* memory_global_dirty_log_start: begin dirty logging for all regions
*
* @flags: purpose of starting dirty log, migration or dirty rate
*/
void memory_global_dirty_log_start(unsigned int flags);
/**
* memory_global_dirty_log_stop: end dirty logging for all regions
*
* @flags: purpose of stopping dirty log, migration or dirty rate
*/
void memory_global_dirty_log_stop(unsigned int flags);
void mtree_info(bool flatview, bool dispatch_tree, bool owner, bool disabled);
/**
* memory_region_dispatch_read: perform a read directly to the specified
* MemoryRegion.
*
* @mr: #MemoryRegion to access
* @addr: address within that region
* @pval: pointer to uint64_t which the data is written to
* @op: size, sign, and endianness of the memory operation
* @attrs: memory transaction attributes to use for the access
*/
MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
hwaddr addr,
uint64_t *pval,
MemOp op,
MemTxAttrs attrs);
/**
* memory_region_dispatch_write: perform a write directly to the specified
* MemoryRegion.
*
* @mr: #MemoryRegion to access
* @addr: address within that region
* @data: data to write
* @op: size, sign, and endianness of the memory operation
* @attrs: memory transaction attributes to use for the access
*/
MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
hwaddr addr,
uint64_t data,
MemOp op,
MemTxAttrs attrs);
/**
* address_space_init: initializes an address space
*
* @as: an uninitialized #AddressSpace
* @root: a #MemoryRegion that routes addresses for the address space
* @name: an address space name. The name is only used for debugging
* output.
*/
void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name);
/**
* address_space_destroy: destroy an address space
*
* Releases all resources associated with an address space. After an address space
* is destroyed, its root memory region (given by address_space_init()) may be destroyed
* as well.
*
* @as: address space to be destroyed
*/
void address_space_destroy(AddressSpace *as);
/**
* address_space_remove_listeners: unregister all listeners of an address space
*
* Removes all callbacks previously registered with memory_listener_register()
* for @as.
*
* @as: an initialized #AddressSpace
*/
void address_space_remove_listeners(AddressSpace *as);
/**
* address_space_rw: read from or write to an address space.
*
* Return a MemTxResult indicating whether the operation succeeded
* or failed (eg unassigned memory, device rejected the transaction,
* IOMMU fault).
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @attrs: memory transaction attributes
* @buf: buffer with the data transferred
* @len: the number of bytes to read or write
* @is_write: indicates the transfer direction
*/
MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, void *buf,
hwaddr len, bool is_write);
/**
* address_space_write: write to address space.
*
* Return a MemTxResult indicating whether the operation succeeded
* or failed (eg unassigned memory, device rejected the transaction,
* IOMMU fault).
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @attrs: memory transaction attributes
* @buf: buffer with the data transferred
* @len: the number of bytes to write
*/
MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs,
const void *buf, hwaddr len);
/**
* address_space_write_rom: write to address space, including ROM.
*
* This function writes to the specified address space, but will
* write data to both ROM and RAM. This is used for non-guest
* writes like writes from the gdb debug stub or initial loading
* of ROM contents.
*
* Note that portions of the write which attempt to write data to
* a device will be silently ignored -- only real RAM and ROM will
* be written to.
*
* Return a MemTxResult indicating whether the operation succeeded
* or failed (eg unassigned memory, device rejected the transaction,
* IOMMU fault).
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @attrs: memory transaction attributes
* @buf: buffer with the data transferred
* @len: the number of bytes to write
*/
MemTxResult address_space_write_rom(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs,
const void *buf, hwaddr len);
/* address_space_ld*: load from an address space
* address_space_st*: store to an address space
*
* These functions perform a load or store of the byte, word,
* longword or quad to the specified address within the AddressSpace.
* The _le suffixed functions treat the data as little endian;
* _be indicates big endian; no suffix indicates "same endianness
* as guest CPU".
*
* The "guest CPU endianness" accessors are deprecated for use outside
* target-* code; devices should be CPU-agnostic and use either the LE
* or the BE accessors.
*
* @as #AddressSpace to be accessed
* @addr: address within that address space
* @val: data value, for stores
* @attrs: memory transaction attributes
* @result: location to write the success/failure of the transaction;
* if NULL, this information is discarded
*/
#define SUFFIX
#define ARG1 as
#define ARG1_DECL AddressSpace *as
#include "exec/memory_ldst.h.inc"
#define SUFFIX
#define ARG1 as
#define ARG1_DECL AddressSpace *as
#include "exec/memory_ldst_phys.h.inc"
struct MemoryRegionCache {
void *ptr;
hwaddr xlat;
hwaddr len;
FlatView *fv;
MemoryRegionSection mrs;
bool is_write;
};
#define MEMORY_REGION_CACHE_INVALID ((MemoryRegionCache) { .mrs.mr = NULL })
/* address_space_ld*_cached: load from a cached #MemoryRegion
* address_space_st*_cached: store into a cached #MemoryRegion
*
* These functions perform a load or store of the byte, word,
* longword or quad to the specified address. The address is
* a physical address in the AddressSpace, but it must lie within
* a #MemoryRegion that was mapped with address_space_cache_init.
*
* The _le suffixed functions treat the data as little endian;
* _be indicates big endian; no suffix indicates "same endianness
* as guest CPU".
*
* The "guest CPU endianness" accessors are deprecated for use outside
* target-* code; devices should be CPU-agnostic and use either the LE
* or the BE accessors.
*
* @cache: previously initialized #MemoryRegionCache to be accessed
* @addr: address within the address space
* @val: data value, for stores
* @attrs: memory transaction attributes
* @result: location to write the success/failure of the transaction;
* if NULL, this information is discarded
*/
#define SUFFIX _cached_slow
#define ARG1 cache
#define ARG1_DECL MemoryRegionCache *cache
#include "exec/memory_ldst.h.inc"
/* Inline fast path for direct RAM access. */
static inline uint8_t address_space_ldub_cached(MemoryRegionCache *cache,
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
{
assert(addr < cache->len);
if (likely(cache->ptr)) {
return ldub_p(cache->ptr + addr);
} else {
return address_space_ldub_cached_slow(cache, addr, attrs, result);
}
}
static inline void address_space_stb_cached(MemoryRegionCache *cache,
hwaddr addr, uint8_t val, MemTxAttrs attrs, MemTxResult *result)
{
assert(addr < cache->len);
if (likely(cache->ptr)) {
stb_p(cache->ptr + addr, val);
} else {
address_space_stb_cached_slow(cache, addr, val, attrs, result);
}
}
#define ENDIANNESS _le
#include "exec/memory_ldst_cached.h.inc"
#define ENDIANNESS _be
#include "exec/memory_ldst_cached.h.inc"
#define SUFFIX _cached
#define ARG1 cache
#define ARG1_DECL MemoryRegionCache *cache
#include "exec/memory_ldst_phys.h.inc"
/* address_space_cache_init: prepare for repeated access to a physical
* memory region
*
* @cache: #MemoryRegionCache to be filled
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @len: length of buffer
* @is_write: indicates the transfer direction
*
* Will only work with RAM, and may map a subset of the requested range by
* returning a value that is less than @len. On failure, return a negative
* errno value.
*
* Because it only works with RAM, this function can be used for
* read-modify-write operations. In this case, is_write should be %true.
*
* Note that addresses passed to the address_space_*_cached functions
* are relative to @addr.
*/
int64_t address_space_cache_init(MemoryRegionCache *cache,
AddressSpace *as,
hwaddr addr,
hwaddr len,
bool is_write);
/**
* address_space_cache_invalidate: complete a write to a #MemoryRegionCache
*
* @cache: The #MemoryRegionCache to operate on.
* @addr: The first physical address that was written, relative to the
* address that was passed to @address_space_cache_init.
* @access_len: The number of bytes that were written starting at @addr.
*/
void address_space_cache_invalidate(MemoryRegionCache *cache,
hwaddr addr,
hwaddr access_len);
/**
* address_space_cache_destroy: free a #MemoryRegionCache
*
* @cache: The #MemoryRegionCache whose memory should be released.
*/
void address_space_cache_destroy(MemoryRegionCache *cache);
/* address_space_get_iotlb_entry: translate an address into an IOTLB
* entry. Should be called from an RCU critical section.
*/
IOMMUTLBEntry address_space_get_iotlb_entry(AddressSpace *as, hwaddr addr,
bool is_write, MemTxAttrs attrs);
/* address_space_translate: translate an address range into an address space
* into a MemoryRegion and an address range into that section. Should be
* called from an RCU critical section, to avoid that the last reference
* to the returned region disappears after address_space_translate returns.
*
* @fv: #FlatView to be accessed
* @addr: address within that address space
* @xlat: pointer to address within the returned memory region section's
* #MemoryRegion.
* @len: pointer to length
* @is_write: indicates the transfer direction
* @attrs: memory attributes
*/
MemoryRegion *flatview_translate(FlatView *fv,
hwaddr addr, hwaddr *xlat,
hwaddr *len, bool is_write,
MemTxAttrs attrs);
static inline MemoryRegion *address_space_translate(AddressSpace *as,
hwaddr addr, hwaddr *xlat,
hwaddr *len, bool is_write,
MemTxAttrs attrs)
{
return flatview_translate(address_space_to_flatview(as),
addr, xlat, len, is_write, attrs);
}
/* address_space_access_valid: check for validity of accessing an address
* space range
*
* Check whether memory is assigned to the given address space range, and
* access is permitted by any IOMMU regions that are active for the address
* space.
*
* For now, addr and len should be aligned to a page size. This limitation
* will be lifted in the future.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @len: length of the area to be checked
* @is_write: indicates the transfer direction
* @attrs: memory attributes
*/
bool address_space_access_valid(AddressSpace *as, hwaddr addr, hwaddr len,
bool is_write, MemTxAttrs attrs);
/* address_space_map: 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 and set *@plen to zero(0), 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.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @plen: pointer to length of buffer; updated on return
* @is_write: indicates the transfer direction
* @attrs: memory attributes
*/
void *address_space_map(AddressSpace *as, hwaddr addr,
hwaddr *plen, bool is_write, MemTxAttrs attrs);
/* address_space_unmap: Unmaps a memory region previously mapped by address_space_map()
*
* Will also mark the memory as dirty if @is_write == %true. @access_len gives
* the amount of memory that was actually read or written by the caller.
*
* @as: #AddressSpace used
* @buffer: host pointer as returned by address_space_map()
* @len: buffer length as returned by address_space_map()
* @access_len: amount of data actually transferred
* @is_write: indicates the transfer direction
*/
void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
bool is_write, hwaddr access_len);
/* Internal functions, part of the implementation of address_space_read. */
MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, void *buf, hwaddr len);
MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
MemTxAttrs attrs, void *buf,
hwaddr len, hwaddr addr1, hwaddr l,
MemoryRegion *mr);
void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);
/* Internal functions, part of the implementation of address_space_read_cached
* and address_space_write_cached. */
MemTxResult address_space_read_cached_slow(MemoryRegionCache *cache,
hwaddr addr, void *buf, hwaddr len);
MemTxResult address_space_write_cached_slow(MemoryRegionCache *cache,
hwaddr addr, const void *buf,
hwaddr len);
int memory_access_size(MemoryRegion *mr, unsigned l, hwaddr addr);
bool prepare_mmio_access(MemoryRegion *mr);
static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
{
if (is_write) {
return memory_region_is_ram(mr) && !mr->readonly &&
!mr->rom_device && !memory_region_is_ram_device(mr);
} else {
return (memory_region_is_ram(mr) && !memory_region_is_ram_device(mr)) ||
memory_region_is_romd(mr);
}
}
/**
* address_space_read: read from an address space.
*
* Return a MemTxResult indicating whether the operation succeeded
* or failed (eg unassigned memory, device rejected the transaction,
* IOMMU fault). Called within RCU critical section.
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @attrs: memory transaction attributes
* @buf: buffer with the data transferred
* @len: length of the data transferred
*/
static inline __attribute__((__always_inline__))
MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
MemTxAttrs attrs, void *buf,
hwaddr len)
{
MemTxResult result = MEMTX_OK;
hwaddr l, addr1;
void *ptr;
MemoryRegion *mr;
FlatView *fv;
if (__builtin_constant_p(len)) {
if (len) {
RCU_READ_LOCK_GUARD();
fv = address_space_to_flatview(as);
l = len;
mr = flatview_translate(fv, addr, &addr1, &l, false, attrs);
if (len == l && memory_access_is_direct(mr, false)) {
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
memcpy(buf, ptr, len);
} else {
result = flatview_read_continue(fv, addr, attrs, buf, len,
addr1, l, mr);
}
}
} else {
result = address_space_read_full(as, addr, attrs, buf, len);
}
return result;
}
/**
* address_space_read_cached: read from a cached RAM region
*
* @cache: Cached region to be addressed
* @addr: address relative to the base of the RAM region
* @buf: buffer with the data transferred
* @len: length of the data transferred
*/
static inline MemTxResult
address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
void *buf, hwaddr len)
{
assert(addr < cache->len && len <= cache->len - addr);
fuzz_dma_read_cb(cache->xlat + addr, len, cache->mrs.mr);
if (likely(cache->ptr)) {
memcpy(buf, cache->ptr + addr, len);
return MEMTX_OK;
} else {
return address_space_read_cached_slow(cache, addr, buf, len);
}
}
/**
* address_space_write_cached: write to a cached RAM region
*
* @cache: Cached region to be addressed
* @addr: address relative to the base of the RAM region
* @buf: buffer with the data transferred
* @len: length of the data transferred
*/
static inline MemTxResult
address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
const void *buf, hwaddr len)
{
assert(addr < cache->len && len <= cache->len - addr);
if (likely(cache->ptr)) {
memcpy(cache->ptr + addr, buf, len);
return MEMTX_OK;
} else {
return address_space_write_cached_slow(cache, addr, buf, len);
}
}
/**
* address_space_set: Fill address space with a constant byte.
*
* Return a MemTxResult indicating whether the operation succeeded
* or failed (eg unassigned memory, device rejected the transaction,
* IOMMU fault).
*
* @as: #AddressSpace to be accessed
* @addr: address within that address space
* @c: constant byte to fill the memory
* @len: the number of bytes to fill with the constant byte
* @attrs: memory transaction attributes
*/
MemTxResult address_space_set(AddressSpace *as, hwaddr addr,
uint8_t c, hwaddr len, MemTxAttrs attrs);
#ifdef NEED_CPU_H
/* enum device_endian to MemOp. */
static inline MemOp devend_memop(enum device_endian end)
{
QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN &&
DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN);
#if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN
/* Swap if non-host endianness or native (target) endianness */
return (end == DEVICE_HOST_ENDIAN) ? 0 : MO_BSWAP;
#else
const int non_host_endianness =
DEVICE_LITTLE_ENDIAN ^ DEVICE_BIG_ENDIAN ^ DEVICE_HOST_ENDIAN;
/* In this case, native (target) endianness needs no swap. */
return (end == non_host_endianness) ? MO_BSWAP : 0;
#endif
}
#endif
/*
* Inhibit technologies that require discarding of pages in RAM blocks, e.g.,
* to manage the actual amount of memory consumed by the VM (then, the memory
* provided by RAM blocks might be bigger than the desired memory consumption).
* This *must* be set if:
* - Discarding parts of a RAM blocks does not result in the change being
* reflected in the VM and the pages getting freed.
* - All memory in RAM blocks is pinned or duplicated, invaldiating any previous
* discards blindly.
* - Discarding parts of a RAM blocks will result in integrity issues (e.g.,
* encrypted VMs).
* Technologies that only temporarily pin the current working set of a
* driver are fine, because we don't expect such pages to be discarded
* (esp. based on guest action like balloon inflation).
*
* This is *not* to be used to protect from concurrent discards (esp.,
* postcopy).
*
* Returns 0 if successful. Returns -EBUSY if a technology that relies on
* discards to work reliably is active.
*/
int ram_block_discard_disable(bool state);
/*
* See ram_block_discard_disable(): only disable uncoordinated discards,
* keeping coordinated discards (via the RamDiscardManager) enabled.
*/
int ram_block_uncoordinated_discard_disable(bool state);
/*
* Inhibit technologies that disable discarding of pages in RAM blocks.
*
* Returns 0 if successful. Returns -EBUSY if discards are already set to
* broken.
*/
int ram_block_discard_require(bool state);
/*
* See ram_block_discard_require(): only inhibit technologies that disable
* uncoordinated discarding of pages in RAM blocks, allowing co-existance with
* technologies that only inhibit uncoordinated discards (via the
* RamDiscardManager).
*/
int ram_block_coordinated_discard_require(bool state);
/*
* Test if any discarding of memory in ram blocks is disabled.
*/
bool ram_block_discard_is_disabled(void);
/*
* Test if any discarding of memory in ram blocks is required to work reliably.
*/
bool ram_block_discard_is_required(void);
#endif
#endif
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