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Diffstat (limited to 'include/exec/memory.h')
| -rw-r--r-- | include/exec/memory.h | 3177 |
1 files changed, 0 insertions, 3177 deletions
diff --git a/include/exec/memory.h b/include/exec/memory.h deleted file mode 100644 index 02f7528..0000000 --- a/include/exec/memory.h +++ /dev/null @@ -1,3177 +0,0 @@ -/* - * 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/range.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 "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 { - Range range; - 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 - * @unmergeable: this section should not get merged with adjacent sections - */ -struct MemoryRegionSection { - Int128 size; - MemoryRegion *mr; - FlatView *fv; - hwaddr offset_within_region; - hwaddr offset_within_address_space; - bool readonly; - bool nonvolatile; - bool unmergeable; -}; - -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). - * - * Normally there're two use cases for the notifiers: - * - * (1) When the device needs accurate synchronizations of the vIOMMU page - * tables, it needs to register with both MAP|UNMAP notifies (which - * is defined as IOMMU_NOTIFIER_IOTLB_EVENTS below). - * - * Regarding to accurate synchronization, it's when the notified - * device maintains a shadow page table and must be notified on each - * guest MAP (page table entry creation) and UNMAP (invalidation) - * events (e.g. VFIO). Both notifications must be accurate so that - * the shadow page table is fully in sync with the guest view. - * - * (2) When the device doesn't need accurate synchronizations of the - * vIOMMU page tables, it needs to register only with UNMAP or - * DEVIOTLB_UNMAP notifies. - * - * It's when the device maintains a cache of IOMMU translations - * (IOTLB) and is able to fill that cache by requesting translations - * from the vIOMMU through a protocol similar to ATS (Address - * Translation Service). - * - * Note that in this mode the vIOMMU will not maintain a shadowed - * page table for the address space, and the UNMAP messages can cover - * more than the pages that used to get mapped. The IOMMU notifiee - * should be able to take care of over-sized invalidations. - */ -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) - -/* RAM is an mmap-ed named file */ -#define RAM_NAMED_FILE (1 << 9) - -/* RAM is mmap-ed read-only */ -#define RAM_READONLY (1 << 10) - -/* RAM FD is opened read-only */ -#define RAM_READONLY_FD (1 << 11) - -/* RAM can be private that has kvm guest memfd backend */ -#define RAM_GUEST_MEMFD (1 << 12) - -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); -}; - -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/accessed by the VM. - * - * A #RamDiscardManager can only be set for a RAM #MemoryRegion while the - * #MemoryRegion isn't mapped into an address space yet (either directly - * or via an alias); it cannot change while the #MemoryRegion is - * mapped into an address space. - * - * 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 - * becoming 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); - -/** - * memory_get_xlat_addr: Extract addresses from a TLB entry - * - * @iotlb: pointer to an #IOMMUTLBEntry - * @vaddr: virtual address - * @ram_addr: RAM address - * @read_only: indicates if writes are allowed - * @mr_has_discard_manager: indicates memory is controlled by a - * RamDiscardManager - * @errp: pointer to Error*, to store an error if it happens. - * - * Return: true on success, else false setting @errp with error. - */ -bool memory_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr, - ram_addr_t *ram_addr, bool *read_only, - bool *mr_has_discard_manager, Error **errp); - -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; - bool unmergeable; - uint8_t dirty_log_mask; - bool is_iommu; - RAMBlock *ram_block; - Object *owner; - /* owner as TYPE_DEVICE. Used for re-entrancy checks in MR access hotpath */ - DeviceState *dev; - - 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 */ - - /* For devices designed to perform re-entrant IO into their own IO MRs */ - bool disable_reentrancy_guard; -}; - -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) - -#define MEMORY_LISTENER_PRIORITY_MIN 0 -#define MEMORY_LISTENER_PRIORITY_ACCEL 10 -#define MEMORY_LISTENER_PRIORITY_DEV_BACKEND 10 - -/** - * 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_val, int new_val); - - /** - * @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_val, int new_val); - - /** - * @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. - * @last_stage: The last stage to synchronize the log during migration. - * The caller should guarantee that the synchronization with true for - * @last_stage is triggered for once after all VCPUs have been stopped. - */ - void (*log_sync_global)(MemoryListener *listener, bool last_stage); - - /** - * @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. - * @errp: pointer to Error*, to store an error if it happens. - * - * Return: true on success, else false setting @errp with error. - */ - bool (*log_global_start)(MemoryListener *listener, Error **errp); - - /** - * @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; -}; - -typedef struct AddressSpaceMapClient { - QEMUBH *bh; - QLIST_ENTRY(AddressSpaceMapClient) link; -} AddressSpaceMapClient; - -typedef struct { - MemoryRegion *mr; - void *buffer; - hwaddr addr; - hwaddr len; - bool in_use; -} BounceBuffer; - -/** - * 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; - int ioeventfd_notifiers; - struct MemoryRegionIoeventfd *ioeventfds; - QTAILQ_HEAD(, MemoryListener) listeners; - QTAILQ_ENTRY(AddressSpace) address_spaces_link; - - /* Bounce buffer to use for this address space. */ - BounceBuffer bounce; - /* List of callbacks to invoke when buffers free up */ - QemuMutex map_client_list_lock; - QLIST_HEAD(, AddressSpaceMapClient) map_client_list; -}; - -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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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, - * RAM_GUEST_MEMFD. - * @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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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 resizable - * 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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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, RAM_PROTECTED, RAM_NAMED_FILE, RAM_READONLY, - * RAM_READONLY_FD, RAM_GUEST_MEMFD - * @path: the path in which to allocate the RAM. - * @offset: offset within the file referenced by path - * @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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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, - ram_addr_t offset, - 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, RAM_NAMED_FILE, RAM_READONLY, - * RAM_READONLY_FD, RAM_GUEST_MEMFD - * @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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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. - * - * Return: true on success, else false setting @errp with error. - */ -bool memory_region_init_ram(MemoryRegion *mr, - Object *owner, - const char *name, - uint64_t size, - Error **errp); - -bool memory_region_init_ram_guest_memfd(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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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. - * - * Return: true on success, else false setting @errp with error. - */ -bool 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_has_guest_memfd: check whether a memory region has guest_memfd - * associated - * - * Returns %true if a memory region's ram_block has valid guest_memfd assigned. - * - * @mr: the memory region being queried - */ -bool memory_region_has_guest_memfd(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, - const 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, - const IOMMUTLBEvent *event); - -/** - * memory_region_unmap_iommu_notifier_range: notify a unmap for an IOMMU - * translation that covers the - * range of a notifier - * - * @notifier: the notifier to be notified - */ -void memory_region_unmap_iommu_notifier_range(IOMMUNotifier *notifier); - - -/** - * 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_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 BQL, 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 BQL, 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 copied 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_set_unmergeable: Set a memory region unmergeable - * - * Mark a memory region unmergeable, resulting in the memory region (or - * everything contained in a memory region container) not getting merged when - * simplifying the address space and notifying memory listeners. Consequently, - * memory listeners will never get notified about ranges that are larger than - * the original memory regions. - * - * This is primarily useful when multiple aliases to a RAM memory region are - * mapped into a memory region container, and updates (e.g., enable/disable or - * map/unmap) of individual memory region aliases are not supposed to affect - * other memory regions in the same container. - * - * @mr: the #MemoryRegion to be updated - * @unmergeable: whether to mark the #MemoryRegion unmergeable - */ -void memory_region_set_unmergeable(MemoryRegion *mr, bool unmergeable); - -/** - * 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. - * - * @last_stage: whether this is the last stage of live migration - */ -void memory_global_dirty_log_sync(bool last_stage); - -/** - * 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 - * @errp: pointer to Error*, to store an error if it happens. - * - * Return: true on success, else false setting @errp with error. - */ -bool memory_global_dirty_log_start(unsigned int flags, Error **errp); - -/** - * 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); - -bool memory_region_access_valid(MemoryRegion *mr, hwaddr addr, - unsigned size, bool is_write, - MemTxAttrs attrs); - -/** - * 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 { - uint8_t *ptr; - hwaddr xlat; - hwaddr len; - FlatView *fv; - MemoryRegionSection mrs; - bool is_write; -}; - -/* 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_init_empty: Initialize empty #MemoryRegionCache - * - * @cache: The #MemoryRegionCache to operate on. - * - * Initializes #MemoryRegionCache structure without memory region attached. - * Cache initialized this way can only be safely destroyed, but not used. - */ -static inline void address_space_cache_init_empty(MemoryRegionCache *cache) -{ - cache->mrs.mr = NULL; - /* There is no real need to initialize fv, but it makes Coverity happy. */ - cache->fv = NULL; -} - -/** - * 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 address_space_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); - -/* - * address_space_register_map_client: Register a callback to invoke when - * resources for address_space_map() are available again. - * - * address_space_map may fail when there are not enough resources available, - * such as when bounce buffer memory would exceed the limit. The callback can - * be used to retry the address_space_map operation. Note that the callback - * gets automatically removed after firing. - * - * @as: #AddressSpace to be accessed - * @bh: callback to invoke when address_space_map() retry is appropriate - */ -void address_space_register_map_client(AddressSpace *as, QEMUBH *bh); - -/* - * address_space_unregister_map_client: Unregister a callback that has - * previously been registered and not fired yet. - * - * @as: #AddressSpace to be accessed - * @bh: callback to unregister - */ -void address_space_unregister_map_client(AddressSpace *as, QEMUBH *bh); - -/* 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 COMPILING_PER_TARGET -/* 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 /* COMPILING_PER_TARGET */ - -/* - * 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-existence 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 |