Пример #1
0
static void vhost_client_set_memory(CPUPhysMemoryClient *client,
                                    target_phys_addr_t start_addr,
                                    ram_addr_t size,
                                    ram_addr_t phys_offset)
{
    struct vhost_dev *dev = container_of(client, struct vhost_dev, client);
    ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
    int s = offsetof(struct vhost_memory, regions) +
        (dev->mem->nregions + 1) * sizeof dev->mem->regions[0];
    uint64_t log_size;
    int r;
    dev->mem = qemu_realloc(dev->mem, s);

    assert(size);

    vhost_dev_unassign_memory(dev, start_addr, size);
    if (flags == IO_MEM_RAM) {
        /* Add given mapping, merging adjacent regions if any */
        vhost_dev_assign_memory(dev, start_addr, size,
                                (uintptr_t)qemu_get_ram_ptr(phys_offset));
    } else {
        /* Remove old mapping for this memory, if any. */
        vhost_dev_unassign_memory(dev, start_addr, size);
    }

    if (!dev->started) {
        return;
    }

    if (dev->started) {
        r = vhost_verify_ring_mappings(dev, start_addr, size);
        assert(r >= 0);
    }

    if (!dev->log_enabled) {
        r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
        assert(r >= 0);
        return;
    }
    log_size = vhost_get_log_size(dev);
    /* We allocate an extra 4K bytes to log,
     * to reduce the * number of reallocations. */
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
    /* To log more, must increase log size before table update. */
    if (dev->log_size < log_size) {
        vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER);
    }
    r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
    assert(r >= 0);
    /* To log less, can only decrease log size after table update. */
    if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
        vhost_dev_log_resize(dev, log_size);
    }
}
Пример #2
0
static void vhost_set_memory(MemoryListener *listener,
                             MemoryRegionSection *section,
                             bool add)
{
    struct vhost_dev *dev = container_of(listener, struct vhost_dev,
                                         memory_listener);
    target_phys_addr_t start_addr = section->offset_within_address_space;
    ram_addr_t size = section->size;
    bool log_dirty = memory_region_is_logging(section->mr);
    int s = offsetof(struct vhost_memory, regions) +
        (dev->mem->nregions + 1) * sizeof dev->mem->regions[0];
    uint64_t log_size;
    int r;
    void *ram;

    dev->mem = g_realloc(dev->mem, s);

    if (log_dirty) {
        add = false;
    }

    assert(size);

    /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */
    ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region;
    if (add) {
        if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) {
            /* Region exists with same address. Nothing to do. */
            return;
        }
    } else {
        if (!vhost_dev_find_reg(dev, start_addr, size)) {
            /* Removing region that we don't access. Nothing to do. */
            return;
        }
    }

    vhost_dev_unassign_memory(dev, start_addr, size);
    if (add) {
        /* Add given mapping, merging adjacent regions if any */
        vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram);
    } else {
        /* Remove old mapping for this memory, if any. */
        vhost_dev_unassign_memory(dev, start_addr, size);
    }

    if (!dev->started) {
        return;
    }

    if (dev->started) {
        r = vhost_verify_ring_mappings(dev, start_addr, size);
        assert(r >= 0);
    }

    if (!dev->log_enabled) {
        r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
        assert(r >= 0);
        return;
    }
    log_size = vhost_get_log_size(dev);
    /* We allocate an extra 4K bytes to log,
     * to reduce the * number of reallocations. */
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
    /* To log more, must increase log size before table update. */
    if (dev->log_size < log_size) {
        vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER);
    }
    r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
    assert(r >= 0);
    /* To log less, can only decrease log size after table update. */
    if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
        vhost_dev_log_resize(dev, log_size);
    }
}