/* * Physical memory management API * * Copyright 2011 Red Hat, Inc. and/or its affiliates * * Authors: * Avi Kivity * * 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 #include #include "qemu-common.h" #include "cpu-common.h" #include "targphys.h" #include "qemu-queue.h" #include "iorange.h" #include "ioport.h" typedef struct MemoryRegionOps MemoryRegionOps; typedef struct MemoryRegion MemoryRegion; typedef struct MemoryRegionPortio MemoryRegionPortio; typedef struct MemoryRegionMmio MemoryRegionMmio; /* Must match *_DIRTY_FLAGS in cpu-all.h. To be replaced with dynamic * registration. */ #define DIRTY_MEMORY_VGA 0 #define DIRTY_MEMORY_CODE 1 #define DIRTY_MEMORY_MIGRATION 3 struct MemoryRegionMmio { CPUReadMemoryFunc *read[3]; CPUWriteMemoryFunc *write[3]; }; /* * Memory region callbacks */ struct MemoryRegionOps { /* Read from the memory region. @addr is relative to @mr; @size is * in bytes. */ uint64_t (*read)(void *opaque, target_phys_addr_t addr, unsigned size); /* Write to the memory region. @addr is relative to @mr; @size is * in bytes. */ void (*write)(void *opaque, target_phys_addr_t addr, uint64_t data, unsigned size); 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; } 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; /* If .read and .write are not present, old_portio may be used for * backwards compatibility with old portio registration */ const MemoryRegionPortio *old_portio; /* If .read and .write are not present, old_mmio may be used for * backwards compatibility with old mmio registration */ const MemoryRegionMmio old_mmio; }; typedef struct CoalescedMemoryRange CoalescedMemoryRange; typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd; struct MemoryRegion { /* All fields are private - violators will be prosecuted */ const MemoryRegionOps *ops; void *opaque; MemoryRegion *parent; uint64_t size; target_phys_addr_t addr; target_phys_addr_t offset; bool backend_registered; void (*destructor)(MemoryRegion *mr); ram_addr_t ram_addr; IORange iorange; bool terminates; MemoryRegion *alias; target_phys_addr_t alias_offset; unsigned priority; bool may_overlap; QTAILQ_HEAD(subregions, MemoryRegion) subregions; QTAILQ_ENTRY(MemoryRegion) subregions_link; QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced; const char *name; uint8_t dirty_log_mask; unsigned ioeventfd_nb; MemoryRegionIoeventfd *ioeventfds; }; struct MemoryRegionPortio { uint32_t offset; uint32_t len; unsigned size; IOPortReadFunc *read; IOPortWriteFunc *write; }; #define PORTIO_END_OF_LIST() { } /** * memory_region_init: Initialize a memory region * * The region typically acts as a container for other memory regions. Us * memory_region_add_subregion() to add subregions. * * @mr: the #MemoryRegion to be initialized * @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, const char *name, uint64_t size); /** * memory_region_init_io: Initialize an I/O memory region. * * Accesses into the region will be cause the callbacks in @ops to be called. * if @size is nonzero, subregions will be clipped to @size. * * @mr: the #MemoryRegion to be initialized. * @ops: a structure containing read and write callbacks to be used when * I/O is performed on the region. * @opaque: passed to 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, const MemoryRegionOps *ops, void *opaque, const char *name, uint64_t size); /** * memory_region_init_ram: Initialize RAM memory region. Accesses into the * region will be modify memory directly. * * @mr: the #MemoryRegion to be initialized. * @dev: a device associated with the region; may be %NULL. * @name: the name of the region; the pair (@dev, @name) must be globally * unique. The name is part of the save/restore ABI and so cannot be * changed. * @size: size of the region. */ void memory_region_init_ram(MemoryRegion *mr, DeviceState *dev, /* FIXME: layering violation */ const char *name, uint64_t size); /** * memory_region_init_ram: Initialize RAM memory region from a user-provided. * pointer. Accesses into the region will be modify * memory directly. * * @mr: the #MemoryRegion to be initialized. * @dev: a device associated with the region; may be %NULL. * @name: the name of the region; the pair (@dev, @name) must be globally * unique. The name is part of the save/restore ABI and so cannot be * changed. * @size: size of the region. * @ptr: memory to be mapped; must contain at least @size bytes. */ void memory_region_init_ram_ptr(MemoryRegion *mr, DeviceState *dev, /* FIXME: layering violation */ 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. * @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, const char *name, MemoryRegion *orig, target_phys_addr_t offset, uint64_t size); /** * memory_region_destroy: Destroy a memory region and relaim all resources. * * @mr: the region to be destroyed. May not currently be a subregion * (see memory_region_add_subregion()) or referenced in an alias * (see memory_region_init_alias()). */ void memory_region_destroy(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_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. * * @mr: the memory region being queried. */ void *memory_region_get_ram_ptr(MemoryRegion *mr); /** * memory_region_set_offset: Sets an offset to be added to MemoryRegionOps * callbacks. * * This function is deprecated and should not be used in new code. */ void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset); /** * 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_MIGRATION or * %DIRTY_MEMORY_VGA. */ void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client); /** * memory_region_get_dirty: Check whether a page is dirty for a specified * client. * * Checks whether a page has been written to since the last * call to memory_region_reset_dirty() with the same @client. Dirty logging * must be enabled. * * @mr: the memory region being queried. * @addr: the address (relative to the start of the region) being queried. * @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or * %DIRTY_MEMORY_VGA. */ bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr, unsigned client); /** * memory_region_set_dirty: Mark a page as dirty in a memory region. * * Marks a page as dirty, after it has been dirtied outside guest code. * * @mr: the memory region being queried. * @addr: the address (relative to the start of the region) being dirtied. */ void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr); /** * memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with * any external TLBs (e.g. kvm) * * Flushes dirty information from accelerators such as kvm and vhost-net * and makes it available to users of the memory API. * * @mr: the region being flushed. */ void memory_region_sync_dirty_bitmap(MemoryRegion *mr); /** * 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, target_phys_addr_t addr, target_phys_addr_t size, unsigned client); /** * 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_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, target_phys_addr_t 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_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 (hat 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 * @fd: the eventfd to be triggered when @addr, @size, and @data all match. **/ void memory_region_add_eventfd(MemoryRegion *mr, target_phys_addr_t addr, unsigned size, bool match_data, uint64_t data, int fd); /** * memory_region_del_eventfd: Cancel and eventfd. * * Cancels an eventfd trigger request 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 * @fd: the eventfd to be triggered when @addr, @size, and @data all match. */ void memory_region_del_eventfd(MemoryRegion *mr, target_phys_addr_t addr, unsigned size, bool match_data, uint64_t data, int fd); /** * memory_region_add_subregion: Add a sub-region to a container. * * Adds a sub-region at @offset. The sub-region 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, target_phys_addr_t offset, MemoryRegion *subregion); /** * memory_region_add_subregion: Add a sub-region to a container, with overlap. * * Adds a sub-region at @offset. The sub-region 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, target_phys_addr_t offset, MemoryRegion *subregion, unsigned priority); /** * 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); /* Start a transaction; changes will be accumulated and made visible only * when the transaction ends. */ void memory_region_transaction_begin(void); /* Commit a transaction and make changes visible to the guest. */ void memory_region_transaction_commit(void); #endif #endif