cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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ramblock.h (2485B)

      1/*
      2 * Declarations for cpu physical memory functions
      3 *
      4 * Copyright 2011 Red Hat, Inc. and/or its affiliates
      5 *
      6 * Authors:
      7 *  Avi Kivity <avi@redhat.com>
      8 *
      9 * This work is licensed under the terms of the GNU GPL, version 2 or
     10 * later.  See the COPYING file in the top-level directory.
     11 *
     12 */
     13
     14/*
     15 * This header is for use by exec.c and memory.c ONLY.  Do not include it.
     16 * The functions declared here will be removed soon.
     17 */
     18
     19#ifndef QEMU_EXEC_RAMBLOCK_H
     20#define QEMU_EXEC_RAMBLOCK_H
     21
     22#ifndef CONFIG_USER_ONLY
     23#include "cpu-common.h"
     24
     25struct RAMBlock {
     26    struct rcu_head rcu;
     27    struct MemoryRegion *mr;
     28    uint8_t *host;
     29    uint8_t *colo_cache; /* For colo, VM's ram cache */
     30    ram_addr_t offset;
     31    ram_addr_t used_length;
     32    ram_addr_t max_length;
     33    void (*resized)(const char*, uint64_t length, void *host);
     34    uint32_t flags;
     35    /* Protected by iothread lock.  */
     36    char idstr[256];
     37    /* RCU-enabled, writes protected by the ramlist lock */
     38    QLIST_ENTRY(RAMBlock) next;
     39    QLIST_HEAD(, RAMBlockNotifier) ramblock_notifiers;
     40    int fd;
     41    size_t page_size;
     42    /* dirty bitmap used during migration */
     43    unsigned long *bmap;
     44    /* bitmap of already received pages in postcopy */
     45    unsigned long *receivedmap;
     46
     47    /*
     48     * bitmap to track already cleared dirty bitmap.  When the bit is
     49     * set, it means the corresponding memory chunk needs a log-clear.
     50     * Set this up to non-NULL to enable the capability to postpone
     51     * and split clearing of dirty bitmap on the remote node (e.g.,
     52     * KVM).  The bitmap will be set only when doing global sync.
     53     *
     54     * NOTE: this bitmap is different comparing to the other bitmaps
     55     * in that one bit can represent multiple guest pages (which is
     56     * decided by the `clear_bmap_shift' variable below).  On
     57     * destination side, this should always be NULL, and the variable
     58     * `clear_bmap_shift' is meaningless.
     59     */
     60    unsigned long *clear_bmap;
     61    uint8_t clear_bmap_shift;
     62
     63    /*
     64     * RAM block length that corresponds to the used_length on the migration
     65     * source (after RAM block sizes were synchronized). Especially, after
     66     * starting to run the guest, used_length and postcopy_length can differ.
     67     * Used to register/unregister uffd handlers and as the size of the received
     68     * bitmap. Receiving any page beyond this length will bail out, as it
     69     * could not have been valid on the source.
     70     */
     71    ram_addr_t postcopy_length;
     72};
     73#endif
     74#endif