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generated by cgit v1.1 at 2026-01-23 23:26:45 +0000
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/*
 * Copyright (C) 2011       Citrix Ltd.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "config.h"

#include <sys/resource.h>

#include "hw/xen_backend.h"
#include "blockdev.h"
#include "bitmap.h"

#include <xen/hvm/params.h>
#include <sys/mman.h>

#include "xen-mapcache.h"
#include "trace.h"


//#define MAPCACHE_DEBUG

#ifdef MAPCACHE_DEBUG
#  define DPRINTF(fmt, ...) do { \
    fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \
} while (0)
#else
#  define DPRINTF(fmt, ...) do { } while (0)
#endif

#if defined(__i386__)
#  define MCACHE_BUCKET_SHIFT 16
#  define MCACHE_MAX_SIZE     (1UL<<31) /* 2GB Cap */
#elif defined(__x86_64__)
#  define MCACHE_BUCKET_SHIFT 20
#  define MCACHE_MAX_SIZE     (1UL<<35) /* 32GB Cap */
#endif
#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)

#define mapcache_lock()   ((void)0)
#define mapcache_unlock() ((void)0)

typedef struct MapCacheEntry {
    target_phys_addr_t paddr_index;
    uint8_t *vaddr_base;
    unsigned long *valid_mapping;
    uint8_t lock;
    target_phys_addr_t size;
    struct MapCacheEntry *next;
} MapCacheEntry;

typedef struct MapCacheRev {
    uint8_t *vaddr_req;
    target_phys_addr_t paddr_index;
    target_phys_addr_t size;
    QTAILQ_ENTRY(MapCacheRev) next;
} MapCacheRev;

typedef struct MapCache {
    MapCacheEntry *entry;
    unsigned long nr_buckets;
    QTAILQ_HEAD(map_cache_head, MapCacheRev) locked_entries;

    /* For most cases (>99.9%), the page address is the same. */
    target_phys_addr_t last_address_index;
    uint8_t *last_address_vaddr;
    unsigned long max_mcache_size;
    unsigned int mcache_bucket_shift;
} MapCache;

static MapCache *mapcache;

static inline int test_bits(int nr, int size, const unsigned long *addr)
{
    unsigned long res = find_next_zero_bit(addr, size + nr, nr);
    if (res >= nr + size)
        return 1;
    else
        return 0;
}

void xen_map_cache_init(void)
{
    unsigned long size;
    struct rlimit rlimit_as;

    mapcache = qemu_mallocz(sizeof (MapCache));

    QTAILQ_INIT(&mapcache->locked_entries);
    mapcache->last_address_index = -1;

    getrlimit(RLIMIT_AS, &rlimit_as);
    if (rlimit_as.rlim_max < MCACHE_MAX_SIZE) {
        rlimit_as.rlim_cur = rlimit_as.rlim_max;
    } else {
        rlimit_as.rlim_cur = MCACHE_MAX_SIZE;
    }

    setrlimit(RLIMIT_AS, &rlimit_as);
    mapcache->max_mcache_size = rlimit_as.rlim_cur;

    mapcache->nr_buckets =
        (((mapcache->max_mcache_size >> XC_PAGE_SHIFT) +
          (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
         (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));

    size = mapcache->nr_buckets * sizeof (MapCacheEntry);
    size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
    DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
            mapcache->nr_buckets, size);
    mapcache->entry = qemu_mallocz(size);
}

static void xen_remap_bucket(MapCacheEntry *entry,
                             target_phys_addr_t size,
                             target_phys_addr_t address_index)
{
    uint8_t *vaddr_base;
    xen_pfn_t *pfns;
    int *err;
    unsigned int i;
    target_phys_addr_t nb_pfn = size >> XC_PAGE_SHIFT;

    trace_xen_remap_bucket(address_index);

    pfns = qemu_mallocz(nb_pfn * sizeof (xen_pfn_t));
    err = qemu_mallocz(nb_pfn * sizeof (int));