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/*
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* Physical memory management API
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*
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* Copyright 2011 Red Hat, Inc. and/or its affiliates
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*
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* Authors:
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* Avi Kivity <avi@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef MEMORY_H
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#define MEMORY_H
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#ifndef CONFIG_USER_ONLY
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#include <stdint.h> |
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#include <stdbool.h> |
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#include "qemu-common.h" |
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#include "cpu-common.h" |
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#include "targphys.h" |
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#include "qemu-queue.h" |
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#include "iorange.h" |
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#include "ioport.h" |
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#include "int128.h" |
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typedef struct MemoryRegionOps MemoryRegionOps; |
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typedef struct MemoryRegion MemoryRegion; |
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typedef struct MemoryRegionPortio MemoryRegionPortio; |
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typedef struct MemoryRegionMmio MemoryRegionMmio; |
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/* Must match *_DIRTY_FLAGS in cpu-all.h. To be replaced with dynamic
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* registration.
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*/
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#define DIRTY_MEMORY_VGA 0 |
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#define DIRTY_MEMORY_CODE 1 |
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#define DIRTY_MEMORY_MIGRATION 3 |
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struct MemoryRegionMmio {
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CPUReadMemoryFunc *read[3];
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CPUWriteMemoryFunc *write[3];
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}; |
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/*
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* Memory region callbacks
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*/
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struct MemoryRegionOps {
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/* Read from the memory region. @addr is relative to @mr; @size is
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* in bytes. */
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uint64_t (*read)(void *opaque,
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target_phys_addr_t addr, |
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unsigned size);
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/* Write to the memory region. @addr is relative to @mr; @size is
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* in bytes. */
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void (*write)(void *opaque, |
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target_phys_addr_t addr, |
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uint64_t data, |
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unsigned size);
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enum device_endian endianness;
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/* Guest-visible constraints: */
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struct {
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/* If nonzero, specify bounds on access sizes beyond which a machine
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* check is thrown.
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*/
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unsigned min_access_size;
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unsigned max_access_size;
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/* If true, unaligned accesses are supported. Otherwise unaligned
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* accesses throw machine checks.
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*/
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bool unaligned;
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/*
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* If present, and returns #false, the transaction is not accepted
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* by the device (and results in machine dependent behaviour such
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* as a machine check exception).
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*/
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bool (*accepts)(void *opaque, target_phys_addr_t addr, |
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unsigned size, bool is_write); |
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} valid; |
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/* Internal implementation constraints: */
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struct {
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/* If nonzero, specifies the minimum size implemented. Smaller sizes
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* will be rounded upwards and a partial result will be returned.
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*/
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unsigned min_access_size;
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/* If nonzero, specifies the maximum size implemented. Larger sizes
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* will be done as a series of accesses with smaller sizes.
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*/
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unsigned max_access_size;
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/* If true, unaligned accesses are supported. Otherwise all accesses
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* are converted to (possibly multiple) naturally aligned accesses.
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*/
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bool unaligned;
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} impl; |
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/* If .read and .write are not present, old_portio may be used for
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* backwards compatibility with old portio registration
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*/
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const MemoryRegionPortio *old_portio;
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/* If .read and .write are not present, old_mmio may be used for
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* backwards compatibility with old mmio registration
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*/
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const MemoryRegionMmio old_mmio;
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}; |
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typedef struct CoalescedMemoryRange CoalescedMemoryRange; |
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typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd; |
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struct MemoryRegion {
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/* All fields are private - violators will be prosecuted */
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const MemoryRegionOps *ops;
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void *opaque;
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MemoryRegion *parent; |
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Int128 size; |
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target_phys_addr_t addr; |
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target_phys_addr_t offset; |
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void (*destructor)(MemoryRegion *mr);
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ram_addr_t ram_addr; |
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IORange iorange; |
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bool subpage;
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bool terminates;
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bool readable;
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bool ram;
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bool readonly; /* For RAM regions */ |
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bool enabled;
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bool rom_device;
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MemoryRegion *alias; |
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target_phys_addr_t alias_offset; |
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unsigned priority;
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bool may_overlap;
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QTAILQ_HEAD(subregions, MemoryRegion) subregions; |
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QTAILQ_ENTRY(MemoryRegion) subregions_link; |
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QTAILQ_HEAD(coalesced_ranges, CoalescedMemoryRange) coalesced; |
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const char *name; |
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uint8_t dirty_log_mask; |
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unsigned ioeventfd_nb;
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MemoryRegionIoeventfd *ioeventfds; |
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}; |
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struct MemoryRegionPortio {
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uint32_t offset; |
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uint32_t len; |
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unsigned size;
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IOPortReadFunc *read; |
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IOPortWriteFunc *write; |
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}; |
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#define PORTIO_END_OF_LIST() { }
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typedef struct MemoryRegionSection MemoryRegionSection; |
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/**
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* MemoryRegionSection: describes a fragment of a #MemoryRegion
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*
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* @mr: the region, or %NULL if empty
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* @address_space: the address space the region is mapped in
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* @offset_within_region: the beginning of the section, relative to @mr's start
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* @size: the size of the section; will not exceed @mr's boundaries
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* @offset_within_address_space: the address of the first byte of the section
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* relative to the region's address space
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*/
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struct MemoryRegionSection {
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MemoryRegion *mr; |
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MemoryRegion *address_space; |
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target_phys_addr_t offset_within_region; |
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uint64_t size; |
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target_phys_addr_t offset_within_address_space; |
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}; |
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typedef struct MemoryListener MemoryListener; |
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/**
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* MemoryListener: callbacks structure for updates to the physical memory map
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*
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* Allows a component to adjust to changes in the guest-visible memory map.
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* Use with memory_listener_register() and memory_listener_unregister().
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*/
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struct MemoryListener {
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void (*region_add)(MemoryListener *listener, MemoryRegionSection *section);
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void (*region_del)(MemoryListener *listener, MemoryRegionSection *section);
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void (*log_start)(MemoryListener *listener, MemoryRegionSection *section);
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void (*log_stop)(MemoryListener *listener, MemoryRegionSection *section);
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void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
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void (*log_global_start)(MemoryListener *listener);
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void (*log_global_stop)(MemoryListener *listener);
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QLIST_ENTRY(MemoryListener) link; |
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}; |
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/**
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* memory_region_init: Initialize a memory region
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*
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* The region typically acts as a container for other memory regions. Use
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* memory_region_add_subregion() to add subregions.
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*
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* @mr: the #MemoryRegion to be initialized
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* @name: used for debugging; not visible to the user or ABI
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* @size: size of the region; any subregions beyond this size will be clipped
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*/
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void memory_region_init(MemoryRegion *mr,
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const char *name, |
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uint64_t size); |
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/**
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* memory_region_init_io: Initialize an I/O memory region.
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*
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* Accesses into the region will cause the callbacks in @ops to be called.
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* if @size is nonzero, subregions will be clipped to @size.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @ops: a structure containing read and write callbacks to be used when
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* I/O is performed on the region.
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* @opaque: passed to to the read and write callbacks of the @ops structure.
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* @name: used for debugging; not visible to the user or ABI
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* @size: size of the region.
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*/
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void memory_region_init_io(MemoryRegion *mr,
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const MemoryRegionOps *ops,
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void *opaque,
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const char *name, |
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uint64_t size); |
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/**
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* memory_region_init_ram: Initialize RAM memory region. Accesses into the
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* region will modify memory directly.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @name: the name of the region.
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* @size: size of the region.
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*/
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void memory_region_init_ram(MemoryRegion *mr,
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const char *name, |
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uint64_t size); |
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/**
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* memory_region_init_ram: Initialize RAM memory region from a user-provided.
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* pointer. Accesses into the region will modify
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* memory directly.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @name: the name of the region.
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* @size: size of the region.
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* @ptr: memory to be mapped; must contain at least @size bytes.
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*/
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void memory_region_init_ram_ptr(MemoryRegion *mr,
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const char *name, |
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uint64_t size, |
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void *ptr);
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/**
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* memory_region_init_alias: Initialize a memory region that aliases all or a
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* part of another memory region.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @name: used for debugging; not visible to the user or ABI
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* @orig: the region to be referenced; @mr will be equivalent to
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* @orig between @offset and @offset + @size - 1.
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* @offset: start of the section in @orig to be referenced.
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* @size: size of the region.
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*/
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void memory_region_init_alias(MemoryRegion *mr,
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const char *name, |
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MemoryRegion *orig, |
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target_phys_addr_t offset, |
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uint64_t size); |
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/**
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* memory_region_init_rom_device: Initialize a ROM memory region. Writes are
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* handled via callbacks.
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*
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* @mr: the #MemoryRegion to be initialized.
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* @ops: callbacks for write access handling.
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* @name: the name of the region.
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* @size: size of the region.
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*/
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void memory_region_init_rom_device(MemoryRegion *mr,
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const MemoryRegionOps *ops,
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void *opaque,
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const char *name, |
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uint64_t size); |
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/**
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* memory_region_destroy: Destroy a memory region and reclaim all resources.
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*
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* @mr: the region to be destroyed. May not currently be a subregion
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* (see memory_region_add_subregion()) or referenced in an alias
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* (see memory_region_init_alias()).
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*/
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void memory_region_destroy(MemoryRegion *mr);
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/**
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* memory_region_size: get a memory region's size.
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*
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* @mr: the memory region being queried.
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*/
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uint64_t memory_region_size(MemoryRegion *mr); |
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/**
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* memory_region_is_ram: check whether a memory region is random access
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*
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* Returns %true is a memory region is random access.
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*
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* @mr: the memory region being queried
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*/
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bool memory_region_is_ram(MemoryRegion *mr);
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/**
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* memory_region_name: get a memory region's name
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*
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* Returns the string that was used to initialize the memory region.
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*
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* @mr: the memory region being queried
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*/
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const char *memory_region_name(MemoryRegion *mr); |
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/**
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* memory_region_is_logging: return whether a memory region is logging writes
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*
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* Returns %true if the memory region is logging writes
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*
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* @mr: the memory region being queried
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*/
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bool memory_region_is_logging(MemoryRegion *mr);
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/**
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* memory_region_is_rom: check whether a memory region is ROM
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*
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* Returns %true is a memory region is read-only memory.
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*
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* @mr: the memory region being queried
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*/
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bool memory_region_is_rom(MemoryRegion *mr);
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/**
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* memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
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*
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* Returns a host pointer to a RAM memory region (created with
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* memory_region_init_ram() or memory_region_init_ram_ptr()). Use with
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* care.
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*
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* @mr: the memory region being queried.
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*/
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void *memory_region_get_ram_ptr(MemoryRegion *mr);
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/**
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* memory_region_set_offset: Sets an offset to be added to MemoryRegionOps
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* callbacks.
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*
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* This function is deprecated and should not be used in new code.
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*/
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void memory_region_set_offset(MemoryRegion *mr, target_phys_addr_t offset);
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/**
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* memory_region_set_log: Turn dirty logging on or off for a region.
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*
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* Turns dirty logging on or off for a specified client (display, migration).
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* Only meaningful for RAM regions.
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*
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* @mr: the memory region being updated.
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* @log: whether dirty logging is to be enabled or disabled.
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* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
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* %DIRTY_MEMORY_VGA.
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*/
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void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client); |
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/**
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* memory_region_get_dirty: Check whether a page is dirty for a specified
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* client.
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*
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* Checks whether a page has been written to since the last
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* call to memory_region_reset_dirty() with the same @client. Dirty logging
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* must be enabled.
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*
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* @mr: the memory region being queried.
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* @addr: the address (relative to the start of the region) being queried.
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* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
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* %DIRTY_MEMORY_VGA.
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*/
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bool memory_region_get_dirty(MemoryRegion *mr, target_phys_addr_t addr,
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unsigned client);
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/**
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* memory_region_set_dirty: Mark a page as dirty in a memory region.
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*
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* Marks a page as dirty, after it has been dirtied outside guest code.
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*
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* @mr: the memory region being queried.
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* @addr: the address (relative to the start of the region) being dirtied.
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*/
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void memory_region_set_dirty(MemoryRegion *mr, target_phys_addr_t addr);
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/**
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* memory_region_sync_dirty_bitmap: Synchronize a region's dirty bitmap with
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* any external TLBs (e.g. kvm)
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*
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* Flushes dirty information from accelerators such as kvm and vhost-net
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* and makes it available to users of the memory API.
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*
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* @mr: the region being flushed.
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*/
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void memory_region_sync_dirty_bitmap(MemoryRegion *mr);
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/**
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* memory_region_reset_dirty: Mark a range of pages as clean, for a specified
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* client.
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*
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* Marks a range of pages as no longer dirty.
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*
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* @mr: the region being updated.
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* @addr: the start of the subrange being cleaned.
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* @size: the size of the subrange being cleaned.
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* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
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* %DIRTY_MEMORY_VGA.
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*/
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void memory_region_reset_dirty(MemoryRegion *mr, target_phys_addr_t addr,
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target_phys_addr_t size, unsigned client);
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/**
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* memory_region_set_readonly: Turn a memory region read-only (or read-write)
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*
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* Allows a memory region to be marked as read-only (turning it into a ROM).
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* only useful on RAM regions.
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*
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* @mr: the region being updated.
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* @readonly: whether rhe region is to be ROM or RAM.
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*/
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void memory_region_set_readonly(MemoryRegion *mr, bool readonly); |
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/**
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* memory_region_rom_device_set_readable: enable/disable ROM readability
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*
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* Allows a ROM device (initialized with memory_region_init_rom_device() to
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* to be marked as readable (default) or not readable. When it is readable,
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* the device is mapped to guest memory. When not readable, reads are
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* forwarded to the #MemoryRegion.read function.
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*
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* @mr: the memory region to be updated
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* @readable: whether reads are satisified directly (%true) or via callbacks
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* (%false)
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*/
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void memory_region_rom_device_set_readable(MemoryRegion *mr, bool readable); |
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/**
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* memory_region_set_coalescing: Enable memory coalescing for the region.
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*
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* Enabled writes to a region to be queued for later processing. MMIO ->write
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* callbacks may be delayed until a non-coalesced MMIO is issued.
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* Only useful for IO regions. Roughly similar to write-combining hardware.
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*
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* @mr: the memory region to be write coalesced
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*/
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void memory_region_set_coalescing(MemoryRegion *mr);
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/**
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* memory_region_add_coalescing: Enable memory coalescing for a sub-range of
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* a region.
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*
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* Like memory_region_set_coalescing(), but works on a sub-range of a region.
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* Multiple calls can be issued coalesced disjoint ranges.
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*
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* @mr: the memory region to be updated.
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* @offset: the start of the range within the region to be coalesced.
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* @size: the size of the subrange to be coalesced.
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*/
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void memory_region_add_coalescing(MemoryRegion *mr,
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target_phys_addr_t offset, |
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uint64_t size); |
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|
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/**
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* memory_region_clear_coalescing: Disable MMIO coalescing for the region.
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*
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* Disables any coalescing caused by memory_region_set_coalescing() or
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* memory_region_add_coalescing(). Roughly equivalent to uncacheble memory
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* hardware.
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*
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* @mr: the memory region to be updated.
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*/
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void memory_region_clear_coalescing(MemoryRegion *mr);
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|
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/**
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* memory_region_add_eventfd: Request an eventfd to be triggered when a word
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* is written to a location.
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*
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* Marks a word in an IO region (initialized with memory_region_init_io())
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* as a trigger for an eventfd event. The I/O callback will not be called.
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* The caller must be prepared to handle failure (that is, take the required
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* action if the callback _is_ called).
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*
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* @mr: the memory region being updated.
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* @addr: the address within @mr that is to be monitored
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* @size: the size of the access to trigger the eventfd
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* @match_data: whether to match against @data, instead of just @addr
|
493 |
* @data: the data to match against the guest write
|
494 |
* @fd: the eventfd to be triggered when @addr, @size, and @data all match.
|
495 |
**/
|
496 |
void memory_region_add_eventfd(MemoryRegion *mr,
|
497 |
target_phys_addr_t addr, |
498 |
unsigned size,
|
499 |
bool match_data,
|
500 |
uint64_t data, |
501 |
int fd);
|
502 |
|
503 |
/**
|
504 |
* memory_region_del_eventfd: Cancel an eventfd.
|
505 |
*
|
506 |
* Cancels an eventfd trigger requested by a previous
|
507 |
* memory_region_add_eventfd() call.
|
508 |
*
|
509 |
* @mr: the memory region being updated.
|
510 |
* @addr: the address within @mr that is to be monitored
|
511 |
* @size: the size of the access to trigger the eventfd
|
512 |
* @match_data: whether to match against @data, instead of just @addr
|
513 |
* @data: the data to match against the guest write
|
514 |
* @fd: the eventfd to be triggered when @addr, @size, and @data all match.
|
515 |
*/
|
516 |
void memory_region_del_eventfd(MemoryRegion *mr,
|
517 |
target_phys_addr_t addr, |
518 |
unsigned size,
|
519 |
bool match_data,
|
520 |
uint64_t data, |
521 |
int fd);
|
522 |
/**
|
523 |
* memory_region_add_subregion: Add a subregion to a container.
|
524 |
*
|
525 |
* Adds a subregion at @offset. The subregion may not overlap with other
|
526 |
* subregions (except for those explicitly marked as overlapping). A region
|
527 |
* may only be added once as a subregion (unless removed with
|
528 |
* memory_region_del_subregion()); use memory_region_init_alias() if you
|
529 |
* want a region to be a subregion in multiple locations.
|
530 |
*
|
531 |
* @mr: the region to contain the new subregion; must be a container
|
532 |
* initialized with memory_region_init().
|
533 |
* @offset: the offset relative to @mr where @subregion is added.
|
534 |
* @subregion: the subregion to be added.
|
535 |
*/
|
536 |
void memory_region_add_subregion(MemoryRegion *mr,
|
537 |
target_phys_addr_t offset, |
538 |
MemoryRegion *subregion); |
539 |
/**
|
540 |
* memory_region_add_subregion: Add a subregion to a container, with overlap.
|
541 |
*
|
542 |
* Adds a subregion at @offset. The subregion may overlap with other
|
543 |
* subregions. Conflicts are resolved by having a higher @priority hide a
|
544 |
* lower @priority. Subregions without priority are taken as @priority 0.
|
545 |
* A region may only be added once as a subregion (unless removed with
|
546 |
* memory_region_del_subregion()); use memory_region_init_alias() if you
|
547 |
* want a region to be a subregion in multiple locations.
|
548 |
*
|
549 |
* @mr: the region to contain the new subregion; must be a container
|
550 |
* initialized with memory_region_init().
|
551 |
* @offset: the offset relative to @mr where @subregion is added.
|
552 |
* @subregion: the subregion to be added.
|
553 |
* @priority: used for resolving overlaps; highest priority wins.
|
554 |
*/
|
555 |
void memory_region_add_subregion_overlap(MemoryRegion *mr,
|
556 |
target_phys_addr_t offset, |
557 |
MemoryRegion *subregion, |
558 |
unsigned priority);
|
559 |
|
560 |
/**
|
561 |
* memory_region_get_ram_addr: Get the ram address associated with a memory
|
562 |
* region
|
563 |
*
|
564 |
* DO NOT USE THIS FUCNTION. This is a temporary workaround while the Xen
|
565 |
* code is being reworked.
|
566 |
*/
|
567 |
ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr); |
568 |
|
569 |
/**
|
570 |
* memory_region_del_subregion: Remove a subregion.
|
571 |
*
|
572 |
* Removes a subregion from its container.
|
573 |
*
|
574 |
* @mr: the container to be updated.
|
575 |
* @subregion: the region being removed; must be a current subregion of @mr.
|
576 |
*/
|
577 |
void memory_region_del_subregion(MemoryRegion *mr,
|
578 |
MemoryRegion *subregion); |
579 |
|
580 |
/*
|
581 |
* memory_region_set_enabled: dynamically enable or disable a region
|
582 |
*
|
583 |
* Enables or disables a memory region. A disabled memory region
|
584 |
* ignores all accesses to itself and its subregions. It does not
|
585 |
* obscure sibling subregions with lower priority - it simply behaves as
|
586 |
* if it was removed from the hierarchy.
|
587 |
*
|
588 |
* Regions default to being enabled.
|
589 |
*
|
590 |
* @mr: the region to be updated
|
591 |
* @enabled: whether to enable or disable the region
|
592 |
*/
|
593 |
void memory_region_set_enabled(MemoryRegion *mr, bool enabled); |
594 |
|
595 |
/*
|
596 |
* memory_region_set_address: dynamically update the address of a region
|
597 |
*
|
598 |
* Dynamically updates the address of a region, relative to its parent.
|
599 |
* May be used on regions are currently part of a memory hierarchy.
|
600 |
*
|
601 |
* @mr: the region to be updated
|
602 |
* @addr: new address, relative to parent region
|
603 |
*/
|
604 |
void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr);
|
605 |
|
606 |
/*
|
607 |
* memory_region_set_alias_offset: dynamically update a memory alias's offset
|
608 |
*
|
609 |
* Dynamically updates the offset into the target region that an alias points
|
610 |
* to, as if the fourth argument to memory_region_init_alias() has changed.
|
611 |
*
|
612 |
* @mr: the #MemoryRegion to be updated; should be an alias.
|
613 |
* @offset: the new offset into the target memory region
|
614 |
*/
|
615 |
void memory_region_set_alias_offset(MemoryRegion *mr,
|
616 |
target_phys_addr_t offset); |
617 |
|
618 |
/**
|
619 |
* memory_region_find: locate a MemoryRegion in an address space
|
620 |
*
|
621 |
* Locates the first #MemoryRegion within an address space given by
|
622 |
* @address_space that overlaps the range given by @addr and @size.
|
623 |
*
|
624 |
* Returns a #MemoryRegionSection that describes a contiguous overlap.
|
625 |
* It will have the following characteristics:
|
626 |
* .@offset_within_address_space >= @addr
|
627 |
* .@offset_within_address_space + .@size <= @addr + @size
|
628 |
* .@size = 0 iff no overlap was found
|
629 |
* .@mr is non-%NULL iff an overlap was found
|
630 |
*
|
631 |
* @address_space: a top-level (i.e. parentless) region that contains
|
632 |
* the region to be found
|
633 |
* @addr: start of the area within @address_space to be searched
|
634 |
* @size: size of the area to be searched
|
635 |
*/
|
636 |
MemoryRegionSection memory_region_find(MemoryRegion *address_space, |
637 |
target_phys_addr_t addr, uint64_t size); |
638 |
|
639 |
|
640 |
/**
|
641 |
* memory_global_sync_dirty_bitmap: synchronize the dirty log for all memory
|
642 |
*
|
643 |
* Synchronizes the dirty page log for an entire address space.
|
644 |
* @address_space: a top-level (i.e. parentless) region that contains the
|
645 |
* memory being synchronized
|
646 |
*/
|
647 |
void memory_global_sync_dirty_bitmap(MemoryRegion *address_space);
|
648 |
|
649 |
/**
|
650 |
* memory_region_transaction_begin: Start a transaction.
|
651 |
*
|
652 |
* During a transaction, changes will be accumulated and made visible
|
653 |
* only when the transaction ends (is commited).
|
654 |
*/
|
655 |
void memory_region_transaction_begin(void); |
656 |
|
657 |
/**
|
658 |
* memory_region_transaction_commit: Commit a transaction and make changes
|
659 |
* visible to the guest.
|
660 |
*/
|
661 |
void memory_region_transaction_commit(void); |
662 |
|
663 |
/**
|
664 |
* memory_listener_register: register callbacks to be called when memory
|
665 |
* sections are mapped or unmapped into an address
|
666 |
* space
|
667 |
*
|
668 |
* @listener: an object containing the callbacks to be called
|
669 |
*/
|
670 |
void memory_listener_register(MemoryListener *listener);
|
671 |
|
672 |
/**
|
673 |
* memory_listener_unregister: undo the effect of memory_listener_register()
|
674 |
*
|
675 |
* @listener: an object containing the callbacks to be removed
|
676 |
*/
|
677 |
void memory_listener_unregister(MemoryListener *listener);
|
678 |
|
679 |
/**
|
680 |
* memory_global_dirty_log_start: begin dirty logging for all regions
|
681 |
*/
|
682 |
void memory_global_dirty_log_start(void); |
683 |
|
684 |
/**
|
685 |
* memory_global_dirty_log_stop: begin dirty logging for all regions
|
686 |
*/
|
687 |
void memory_global_dirty_log_stop(void); |
688 |
|
689 |
void mtree_info(fprintf_function mon_printf, void *f); |
690 |
|
691 |
#endif
|
692 |
|
693 |
#endif
|