blob: 6cbedf9e0c9aeb4de684b013f21a491c7e2bd695 [file] [log] [blame]
* Declarations for cpu physical memory functions
* 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 or
* later. See the COPYING file in the top-level directory.
* This header is for use by exec.c and memory.c ONLY. Do not include it.
* The functions declared here will be removed soon.
#include "cpu-common.h"
#include "qemu/rcu.h"
#include "exec/ramlist.h"
struct RAMBlock {
struct rcu_head rcu;
struct MemoryRegion *mr;
uint8_t *host;
uint8_t *colo_cache; /* For colo, VM's ram cache */
ram_addr_t offset;
ram_addr_t used_length;
ram_addr_t max_length;
void (*resized)(const char*, uint64_t length, void *host);
uint32_t flags;
/* Protected by iothread lock. */
char idstr[256];
/* RCU-enabled, writes protected by the ramlist lock */
QLIST_HEAD(, RAMBlockNotifier) ramblock_notifiers;
int fd;
size_t page_size;
/* dirty bitmap used during migration */
unsigned long *bmap;
/* bitmap of already received pages in postcopy */
unsigned long *receivedmap;
* bitmap to track already cleared dirty bitmap. When the bit is
* set, it means the corresponding memory chunk needs a log-clear.
* Set this up to non-NULL to enable the capability to postpone
* and split clearing of dirty bitmap on the remote node (e.g.,
* KVM). The bitmap will be set only when doing global sync.
* NOTE: this bitmap is different comparing to the other bitmaps
* in that one bit can represent multiple guest pages (which is
* decided by the `clear_bmap_shift' variable below). On
* destination side, this should always be NULL, and the variable
* `clear_bmap_shift' is meaningless.
unsigned long *clear_bmap;
uint8_t clear_bmap_shift;
* RAM block length that corresponds to the used_length on the migration
* source (after RAM block sizes were synchronized). Especially, after
* starting to run the guest, used_length and postcopy_length can differ.
* Used to register/unregister uffd handlers and as the size of the received
* bitmap. Receiving any page beyond this length will bail out, as it
* could not have been valid on the source.
ram_addr_t postcopy_length;