hw: move virtio devices to hw/ subdirectories

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 0 insertions, 1042 deletions

diff --git a/hw/vhost.c b/hw/vhost.c
deleted file mode 100644
index 636fad0..0000000
--- a/hw/vhost.c
+++ /dev/null
@@ -1,1042 +0,0 @@
-/*
- * vhost support
- *
- * Copyright Red Hat, Inc. 2010
- *
- * Authors:
- *  Michael S. Tsirkin <mst@redhat.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2.  See
- * the COPYING file in the top-level directory.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include <sys/ioctl.h>
-#include "hw/virtio/vhost.h"
-#include "hw/hw.h"
-#include "qemu/range.h"
-#include <linux/vhost.h>
-#include "exec/address-spaces.h"
-
-static void vhost_dev_sync_region(struct vhost_dev *dev,
-                                  MemoryRegionSection *section,
-                                  uint64_t mfirst, uint64_t mlast,
-                                  uint64_t rfirst, uint64_t rlast)
-{
-    uint64_t start = MAX(mfirst, rfirst);
-    uint64_t end = MIN(mlast, rlast);
-    vhost_log_chunk_t *from = dev->log + start / VHOST_LOG_CHUNK;
-    vhost_log_chunk_t *to = dev->log + end / VHOST_LOG_CHUNK + 1;
-    uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK;
-
-    if (end < start) {
-        return;
-    }
-    assert(end / VHOST_LOG_CHUNK < dev->log_size);
-    assert(start / VHOST_LOG_CHUNK < dev->log_size);
-
-    for (;from < to; ++from) {
-        vhost_log_chunk_t log;
-        int bit;
-        /* We first check with non-atomic: much cheaper,
-         * and we expect non-dirty to be the common case. */
-        if (!*from) {
-            addr += VHOST_LOG_CHUNK;
-            continue;
-        }
-        /* Data must be read atomically. We don't really
-         * need the barrier semantics of __sync
-         * builtins, but it's easier to use them than
-         * roll our own. */
-        log = __sync_fetch_and_and(from, 0);
-        while ((bit = sizeof(log) > sizeof(int) ?
-                ffsll(log) : ffs(log))) {
-            hwaddr page_addr;
-            hwaddr section_offset;
-            hwaddr mr_offset;
-            bit -= 1;
-            page_addr = addr + bit * VHOST_LOG_PAGE;
-            section_offset = page_addr - section->offset_within_address_space;
-            mr_offset = section_offset + section->offset_within_region;
-            memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE);
-            log &= ~(0x1ull << bit);
-        }
-        addr += VHOST_LOG_CHUNK;
-    }
-}
-
-static int vhost_sync_dirty_bitmap(struct vhost_dev *dev,
-                                   MemoryRegionSection *section,
-                                   hwaddr first,
-                                   hwaddr last)
-{
-    int i;
-    hwaddr start_addr;
-    hwaddr end_addr;
-
-    if (!dev->log_enabled || !dev->started) {
-        return 0;
-    }
-    start_addr = section->offset_within_address_space;
-    end_addr = range_get_last(start_addr, section->size);
-    start_addr = MAX(first, start_addr);
-    end_addr = MIN(last, end_addr);
-
-    for (i = 0; i < dev->mem->nregions; ++i) {
-        struct vhost_memory_region *reg = dev->mem->regions + i;
-        vhost_dev_sync_region(dev, section, start_addr, end_addr,
-                              reg->guest_phys_addr,
-                              range_get_last(reg->guest_phys_addr,
-                                             reg->memory_size));
-    }
-    for (i = 0; i < dev->nvqs; ++i) {
-        struct vhost_virtqueue *vq = dev->vqs + i;
-        vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys,
-                              range_get_last(vq->used_phys, vq->used_size));
-    }
-    return 0;
-}
-
-static void vhost_log_sync(MemoryListener *listener,
-                          MemoryRegionSection *section)
-{
-    struct vhost_dev *dev = container_of(listener, struct vhost_dev,
-                                         memory_listener);
-    vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL);
-}
-
-static void vhost_log_sync_range(struct vhost_dev *dev,
-                                 hwaddr first, hwaddr last)
-{
-    int i;
-    /* FIXME: this is N^2 in number of sections */
-    for (i = 0; i < dev->n_mem_sections; ++i) {
-        MemoryRegionSection *section = &dev->mem_sections[i];
-        vhost_sync_dirty_bitmap(dev, section, first, last);
-    }
-}
-
-/* Assign/unassign. Keep an unsorted array of non-overlapping
- * memory regions in dev->mem. */
-static void vhost_dev_unassign_memory(struct vhost_dev *dev,
-                                      uint64_t start_addr,
-                                      uint64_t size)
-{
-    int from, to, n = dev->mem->nregions;
-    /* Track overlapping/split regions for sanity checking. */
-    int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0;
-
-    for (from = 0, to = 0; from < n; ++from, ++to) {
-        struct vhost_memory_region *reg = dev->mem->regions + to;
-        uint64_t reglast;
-        uint64_t memlast;
-        uint64_t change;
-
-        /* clone old region */
-        if (to != from) {
-            memcpy(reg, dev->mem->regions + from, sizeof *reg);
-        }
-
-        /* No overlap is simple */
-        if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size,
-                            start_addr, size)) {
-            continue;
-        }
-
-        /* Split only happens if supplied region
-         * is in the middle of an existing one. Thus it can not
-         * overlap with any other existing region. */
-        assert(!split);
-
-        reglast = range_get_last(reg->guest_phys_addr, reg->memory_size);
-        memlast = range_get_last(start_addr, size);
-
-        /* Remove whole region */
-        if (start_addr <= reg->guest_phys_addr && memlast >= reglast) {
-            --dev->mem->nregions;
-            --to;
-            ++overlap_middle;
-            continue;
-        }
-
-        /* Shrink region */
-        if (memlast >= reglast) {
-            reg->memory_size = start_addr - reg->guest_phys_addr;
-            assert(reg->memory_size);
-            assert(!overlap_end);
-            ++overlap_end;
-            continue;
-        }
-
-        /* Shift region */
-        if (start_addr <= reg->guest_phys_addr) {
-            change = memlast + 1 - reg->guest_phys_addr;
-            reg->memory_size -= change;
-            reg->guest_phys_addr += change;
-            reg->userspace_addr += change;
-            assert(reg->memory_size);
-            assert(!overlap_start);
-            ++overlap_start;
-            continue;
-        }
-
-        /* This only happens if supplied region
-         * is in the middle of an existing one. Thus it can not
-         * overlap with any other existing region. */
-        assert(!overlap_start);
-        assert(!overlap_end);
-        assert(!overlap_middle);
-        /* Split region: shrink first part, shift second part. */
-        memcpy(dev->mem->regions + n, reg, sizeof *reg);
-        reg->memory_size = start_addr - reg->guest_phys_addr;
-        assert(reg->memory_size);
-        change = memlast + 1 - reg->guest_phys_addr;
-        reg = dev->mem->regions + n;
-        reg->memory_size -= change;
-        assert(reg->memory_size);
-        reg->guest_phys_addr += change;
-        reg->userspace_addr += change;
-        /* Never add more than 1 region */
-        assert(dev->mem->nregions == n);
-        ++dev->mem->nregions;
-        ++split;
-    }
-}
-
-/* Called after unassign, so no regions overlap the given range. */
-static void vhost_dev_assign_memory(struct vhost_dev *dev,
-                                    uint64_t start_addr,
-                                    uint64_t size,
-                                    uint64_t uaddr)
-{
-    int from, to;
-    struct vhost_memory_region *merged = NULL;
-    for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) {
-        struct vhost_memory_region *reg = dev->mem->regions + to;
-        uint64_t prlast, urlast;
-        uint64_t pmlast, umlast;
-        uint64_t s, e, u;
-
-        /* clone old region */
-        if (to != from) {
-            memcpy(reg, dev->mem->regions + from, sizeof *reg);
-        }
-        prlast = range_get_last(reg->guest_phys_addr, reg->memory_size);
-        pmlast = range_get_last(start_addr, size);
-        urlast = range_get_last(reg->userspace_addr, reg->memory_size);
-        umlast = range_get_last(uaddr, size);
-
-        /* check for overlapping regions: should never happen. */
-        assert(prlast < start_addr || pmlast < reg->guest_phys_addr);
-        /* Not an adjacent or overlapping region - do not merge. */
-        if ((prlast + 1 != start_addr || urlast + 1 != uaddr) &&
-            (pmlast + 1 != reg->guest_phys_addr ||
-             umlast + 1 != reg->userspace_addr)) {
-            continue;
-        }
-
-        if (merged) {
-            --to;
-            assert(to >= 0);
-        } else {
-            merged = reg;
-        }
-        u = MIN(uaddr, reg->userspace_addr);
-        s = MIN(start_addr, reg->guest_phys_addr);
-        e = MAX(pmlast, prlast);
-        uaddr = merged->userspace_addr = u;
-        start_addr = merged->guest_phys_addr = s;
-        size = merged->memory_size = e - s + 1;
-        assert(merged->memory_size);
-    }
-
-    if (!merged) {
-        struct vhost_memory_region *reg = dev->mem->regions + to;
-        memset(reg, 0, sizeof *reg);
-        reg->memory_size = size;
-        assert(reg->memory_size);
-        reg->guest_phys_addr = start_addr;
-        reg->userspace_addr = uaddr;
-        ++to;
-    }
-    assert(to <= dev->mem->nregions + 1);
-    dev->mem->nregions = to;
-}
-
-static uint64_t vhost_get_log_size(struct vhost_dev *dev)
-{
-    uint64_t log_size = 0;
-    int i;
-    for (i = 0; i < dev->mem->nregions; ++i) {
-        struct vhost_memory_region *reg = dev->mem->regions + i;
-        uint64_t last = range_get_last(reg->guest_phys_addr,
-                                       reg->memory_size);
-        log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1);
-    }
-    for (i = 0; i < dev->nvqs; ++i) {
-        struct vhost_virtqueue *vq = dev->vqs + i;
-        uint64_t last = vq->used_phys + vq->used_size - 1;
-        log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1);
-    }
-    return log_size;
-}
-
-static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size)
-{
-    vhost_log_chunk_t *log;
-    uint64_t log_base;
-    int r;
-
-    log = g_malloc0(size * sizeof *log);
-    log_base = (uint64_t)(unsigned long)log;
-    r = ioctl(dev->control, VHOST_SET_LOG_BASE, &log_base);
-    assert(r >= 0);
-    /* Sync only the range covered by the old log */
-    if (dev->log_size) {
-        vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1);
-    }
-    if (dev->log) {
-        g_free(dev->log);
-    }
-    dev->log = log;
-    dev->log_size = size;
-}
-
-static int vhost_verify_ring_mappings(struct vhost_dev *dev,
-                                      uint64_t start_addr,
-                                      uint64_t size)
-{
-    int i;
-    for (i = 0; i < dev->nvqs; ++i) {
-        struct vhost_virtqueue *vq = dev->vqs + i;
-        hwaddr l;
-        void *p;
-
-        if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) {
-            continue;
-        }
-        l = vq->ring_size;
-        p = cpu_physical_memory_map(vq->ring_phys, &l, 1);
-        if (!p || l != vq->ring_size) {
-            fprintf(stderr, "Unable to map ring buffer for ring %d\n", i);
-            return -ENOMEM;
-        }
-        if (p != vq->ring) {
-            fprintf(stderr, "Ring buffer relocated for ring %d\n", i);
-            return -EBUSY;
-        }
-        cpu_physical_memory_unmap(p, l, 0, 0);
-    }
-    return 0;
-}
-
-static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev,
-						      uint64_t start_addr,
-						      uint64_t size)
-{
-    int i, n = dev->mem->nregions;
-    for (i = 0; i < n; ++i) {
-        struct vhost_memory_region *reg = dev->mem->regions + i;
-        if (ranges_overlap(reg->guest_phys_addr, reg->memory_size,
-                           start_addr, size)) {
-            return reg;
-        }
-    }
-    return NULL;
-}
-
-static bool vhost_dev_cmp_memory(struct vhost_dev *dev,
-                                 uint64_t start_addr,
-                                 uint64_t size,
-                                 uint64_t uaddr)
-{
-    struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size);
-    uint64_t reglast;
-    uint64_t memlast;
-
-    if (!reg) {
-        return true;
-    }
-
-    reglast = range_get_last(reg->guest_phys_addr, reg->memory_size);
-    memlast = range_get_last(start_addr, size);
-
-    /* Need to extend region? */
-    if (start_addr < reg->guest_phys_addr || memlast > reglast) {
-        return true;
-    }
-    /* userspace_addr changed? */
-    return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr;
-}
-
-static void vhost_set_memory(MemoryListener *listener,
-                             MemoryRegionSection *section,
-                             bool add)
-{
-    struct vhost_dev *dev = container_of(listener, struct vhost_dev,
-                                         memory_listener);
-    hwaddr 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);
-    }
-}
-
-static bool vhost_section(MemoryRegionSection *section)
-{
-    return memory_region_is_ram(section->mr);
-}
-
-static void vhost_begin(MemoryListener *listener)
-{
-}
-
-static void vhost_commit(MemoryListener *listener)
-{
-}
-
-static void vhost_region_add(MemoryListener *listener,
-                             MemoryRegionSection *section)
-{
-    struct vhost_dev *dev = container_of(listener, struct vhost_dev,
-                                         memory_listener);
-
-    if (!vhost_section(section)) {
-        return;
-    }
-
-    ++dev->n_mem_sections;
-    dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections,
-                                dev->n_mem_sections);
-    dev->mem_sections[dev->n_mem_sections - 1] = *section;
-    vhost_set_memory(listener, section, true);
-}
-
-static void vhost_region_del(MemoryListener *listener,
-                             MemoryRegionSection *section)
-{
-    struct vhost_dev *dev = container_of(listener, struct vhost_dev,
-                                         memory_listener);
-    int i;
-
-    if (!vhost_section(section)) {
-        return;
-    }
-
-    vhost_set_memory(listener, section, false);
-    for (i = 0; i < dev->n_mem_sections; ++i) {
-        if (dev->mem_sections[i].offset_within_address_space
-            == section->offset_within_address_space) {
-            --dev->n_mem_sections;
-            memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
-                    (dev->n_mem_sections - i) * sizeof(*dev->mem_sections));
-            break;
-        }
-    }
-}
-
-static void vhost_region_nop(MemoryListener *listener,
-                             MemoryRegionSection *section)
-{
-}
-
-static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
-                                    struct vhost_virtqueue *vq,
-                                    unsigned idx, bool enable_log)
-{
-    struct vhost_vring_addr addr = {
-        .index = idx,
-        .desc_user_addr = (uint64_t)(unsigned long)vq->desc,
-        .avail_user_addr = (uint64_t)(unsigned long)vq->avail,
-        .used_user_addr = (uint64_t)(unsigned long)vq->used,
-        .log_guest_addr = vq->used_phys,
-        .flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0,
-    };
-    int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
-    if (r < 0) {
-        return -errno;
-    }
-    return 0;
-}
-
-static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log)
-{
-    uint64_t features = dev->acked_features;
-    int r;
-    if (enable_log) {
-        features |= 0x1 << VHOST_F_LOG_ALL;
-    }
-    r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
-    return r < 0 ? -errno : 0;
-}
-
-static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log)
-{
-    int r, t, i;
-    r = vhost_dev_set_features(dev, enable_log);
-    if (r < 0) {
-        goto err_features;
-    }
-    for (i = 0; i < dev->nvqs; ++i) {
-        r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i,
-                                     enable_log);
-        if (r < 0) {
-            goto err_vq;
-        }
-    }
-    return 0;
-err_vq:
-    for (; i >= 0; --i) {
-        t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i,
-                                     dev->log_enabled);
-        assert(t >= 0);
-    }
-    t = vhost_dev_set_features(dev, dev->log_enabled);
-    assert(t >= 0);
-err_features:
-    return r;
-}
-
-static int vhost_migration_log(MemoryListener *listener, int enable)
-{
-    struct vhost_dev *dev = container_of(listener, struct vhost_dev,
-                                         memory_listener);
-    int r;
-    if (!!enable == dev->log_enabled) {
-        return 0;
-    }
-    if (!dev->started) {
-        dev->log_enabled = enable;
-        return 0;
-    }
-    if (!enable) {
-        r = vhost_dev_set_log(dev, false);
-        if (r < 0) {
-            return r;
-        }
-        if (dev->log) {
-            g_free(dev->log);
-        }
-        dev->log = NULL;
-        dev->log_size = 0;
-    } else {
-        vhost_dev_log_resize(dev, vhost_get_log_size(dev));
-        r = vhost_dev_set_log(dev, true);
-        if (r < 0) {
-            return r;
-        }
-    }
-    dev->log_enabled = enable;
-    return 0;
-}
-
-static void vhost_log_global_start(MemoryListener *listener)
-{
-    int r;
-
-    r = vhost_migration_log(listener, true);
-    if (r < 0) {
-        abort();
-    }
-}
-
-static void vhost_log_global_stop(MemoryListener *listener)
-{
-    int r;
-
-    r = vhost_migration_log(listener, false);
-    if (r < 0) {
-        abort();
-    }
-}
-
-static void vhost_log_start(MemoryListener *listener,
-                            MemoryRegionSection *section)
-{
-    /* FIXME: implement */
-}
-
-static void vhost_log_stop(MemoryListener *listener,
-                           MemoryRegionSection *section)
-{
-    /* FIXME: implement */
-}
-
-static int vhost_virtqueue_start(struct vhost_dev *dev,
-                                struct VirtIODevice *vdev,
-                                struct vhost_virtqueue *vq,
-                                unsigned idx)
-{
-    hwaddr s, l, a;
-    int r;
-    int vhost_vq_index = idx - dev->vq_index;
-    struct vhost_vring_file file = {
-        .index = vhost_vq_index
-    };
-    struct vhost_vring_state state = {
-        .index = vhost_vq_index
-    };
-    struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
-
-    assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
-
-    vq->num = state.num = virtio_queue_get_num(vdev, idx);
-    r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
-    if (r) {
-        return -errno;
-    }
-
-    state.num = virtio_queue_get_last_avail_idx(vdev, idx);
-    r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
-    if (r) {
-        return -errno;
-    }
-
-    s = l = virtio_queue_get_desc_size(vdev, idx);
-    a = virtio_queue_get_desc_addr(vdev, idx);
-    vq->desc = cpu_physical_memory_map(a, &l, 0);
-    if (!vq->desc || l != s) {
-        r = -ENOMEM;
-        goto fail_alloc_desc;
-    }
-    s = l = virtio_queue_get_avail_size(vdev, idx);
-    a = virtio_queue_get_avail_addr(vdev, idx);
-    vq->avail = cpu_physical_memory_map(a, &l, 0);
-    if (!vq->avail || l != s) {
-        r = -ENOMEM;
-        goto fail_alloc_avail;
-    }
-    vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx);
-    vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx);
-    vq->used = cpu_physical_memory_map(a, &l, 1);
-    if (!vq->used || l != s) {
-        r = -ENOMEM;
-        goto fail_alloc_used;
-    }
-
-    vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx);
-    vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx);
-    vq->ring = cpu_physical_memory_map(a, &l, 1);
-    if (!vq->ring || l != s) {
-        r = -ENOMEM;
-        goto fail_alloc_ring;
-    }
-
-    r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled);
-    if (r < 0) {
-        r = -errno;
-        goto fail_alloc;
-    }
-
-    file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq));
-    r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
-    if (r) {
-        r = -errno;
-        goto fail_kick;
-    }
-
-    /* Clear and discard previous events if any. */
-    event_notifier_test_and_clear(&vq->masked_notifier);
-
-    return 0;
-
-fail_kick:
-fail_alloc:
-    cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
-                              0, 0);
-fail_alloc_ring:
-    cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
-                              0, 0);
-fail_alloc_used:
-    cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
-                              0, 0);
-fail_alloc_avail:
-    cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
-                              0, 0);
-fail_alloc_desc:
-    return r;
-}
-
-static void vhost_virtqueue_stop(struct vhost_dev *dev,
-                                    struct VirtIODevice *vdev,
-                                    struct vhost_virtqueue *vq,
-                                    unsigned idx)
-{
-    struct vhost_vring_state state = {
-        .index = idx - dev->vq_index
-    };
-    int r;
-    assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
-    r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state);
-    if (r < 0) {
-        fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r);
-        fflush(stderr);
-    }
-    virtio_queue_set_last_avail_idx(vdev, idx, state.num);
-    assert (r >= 0);
-    cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
-                              0, virtio_queue_get_ring_size(vdev, idx));
-    cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
-                              1, virtio_queue_get_used_size(vdev, idx));
-    cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
-                              0, virtio_queue_get_avail_size(vdev, idx));
-    cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
-                              0, virtio_queue_get_desc_size(vdev, idx));
-}
-
-static void vhost_eventfd_add(MemoryListener *listener,
-                              MemoryRegionSection *section,
-                              bool match_data, uint64_t data, EventNotifier *e)
-{
-}
-
-static void vhost_eventfd_del(MemoryListener *listener,
-                              MemoryRegionSection *section,
-                              bool match_data, uint64_t data, EventNotifier *e)
-{
-}
-
-static int vhost_virtqueue_init(struct vhost_dev *dev,
-                                struct vhost_virtqueue *vq, int n)
-{
-    struct vhost_vring_file file = {
-        .index = n,
-    };
-    int r = event_notifier_init(&vq->masked_notifier, 0);
-    if (r < 0) {
-        return r;
-    }
-
-    file.fd = event_notifier_get_fd(&vq->masked_notifier);
-    r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
-    if (r) {
-        r = -errno;
-        goto fail_call;
-    }
-    return 0;
-fail_call:
-    event_notifier_cleanup(&vq->masked_notifier);
-    return r;
-}
-
-static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq)
-{
-    event_notifier_cleanup(&vq->masked_notifier);
-}
-
-int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
-                   bool force)
-{
-    uint64_t features;
-    int i, r;
-    if (devfd >= 0) {
-        hdev->control = devfd;
-    } else {
-        hdev->control = open(devpath, O_RDWR);
-        if (hdev->control < 0) {
-            return -errno;
-        }
-    }
-    r = ioctl(hdev->control, VHOST_SET_OWNER, NULL);
-    if (r < 0) {
-        goto fail;
-    }
-
-    r = ioctl(hdev->control, VHOST_GET_FEATURES, &features);
-    if (r < 0) {
-        goto fail;
-    }
-
-    for (i = 0; i < hdev->nvqs; ++i) {
-        r = vhost_virtqueue_init(hdev, hdev->vqs + i, i);
-        if (r < 0) {
-            goto fail_vq;
-        }
-    }
-    hdev->features = features;
-
-    hdev->memory_listener = (MemoryListener) {
-        .begin = vhost_begin,
-        .commit = vhost_commit,
-        .region_add = vhost_region_add,
-        .region_del = vhost_region_del,
-        .region_nop = vhost_region_nop,
-        .log_start = vhost_log_start,
-        .log_stop = vhost_log_stop,
-        .log_sync = vhost_log_sync,
-        .log_global_start = vhost_log_global_start,
-        .log_global_stop = vhost_log_global_stop,
-        .eventfd_add = vhost_eventfd_add,
-        .eventfd_del = vhost_eventfd_del,
-        .priority = 10
-    };
-    hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
-    hdev->n_mem_sections = 0;
-    hdev->mem_sections = NULL;
-    hdev->log = NULL;
-    hdev->log_size = 0;
-    hdev->log_enabled = false;
-    hdev->started = false;
-    memory_listener_register(&hdev->memory_listener, &address_space_memory);
-    hdev->force = force;
-    return 0;
-fail_vq:
-    while (--i >= 0) {
-        vhost_virtqueue_cleanup(hdev->vqs + i);
-    }
-fail:
-    r = -errno;
-    close(hdev->control);
-    return r;
-}
-
-void vhost_dev_cleanup(struct vhost_dev *hdev)
-{
-    int i;
-    for (i = 0; i < hdev->nvqs; ++i) {
-        vhost_virtqueue_cleanup(hdev->vqs + i);
-    }
-    memory_listener_unregister(&hdev->memory_listener);
-    g_free(hdev->mem);
-    g_free(hdev->mem_sections);
-    close(hdev->control);
-}
-
-bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev)
-{
-    return !vdev->binding->query_guest_notifiers ||
-        vdev->binding->query_guest_notifiers(vdev->binding_opaque) ||
-        hdev->force;
-}
-
-/* Stop processing guest IO notifications in qemu.
- * Start processing them in vhost in kernel.
- */
-int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
-{
-    int i, r;
-    if (!vdev->binding->set_host_notifier) {
-        fprintf(stderr, "binding does not support host notifiers\n");
-        r = -ENOSYS;
-        goto fail;
-    }
-
-    for (i = 0; i < hdev->nvqs; ++i) {
-        r = vdev->binding->set_host_notifier(vdev->binding_opaque,
-                                             hdev->vq_index + i,
-                                             true);
-        if (r < 0) {
-            fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r);
-            goto fail_vq;
-        }
-    }
-
-    return 0;
-fail_vq:
-    while (--i >= 0) {
-        r = vdev->binding->set_host_notifier(vdev->binding_opaque,
-                                             hdev->vq_index + i,
-                                             false);
-        if (r < 0) {
-            fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r);
-            fflush(stderr);
-        }
-        assert (r >= 0);
-    }
-fail:
-    return r;
-}
-
-/* Stop processing guest IO notifications in vhost.
- * Start processing them in qemu.
- * This might actually run the qemu handlers right away,
- * so virtio in qemu must be completely setup when this is called.
- */
-void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
-{
-    int i, r;
-
-    for (i = 0; i < hdev->nvqs; ++i) {
-        r = vdev->binding->set_host_notifier(vdev->binding_opaque,
-                                             hdev->vq_index + i,
-                                             false);
-        if (r < 0) {
-            fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r);
-            fflush(stderr);
-        }
-        assert (r >= 0);
-    }
-}
-
-/* Test and clear event pending status.
- * Should be called after unmask to avoid losing events.
- */
-bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n)
-{
-    struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index;
-    assert(hdev->started);
-    assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
-    return event_notifier_test_and_clear(&vq->masked_notifier);
-}
-
-/* Mask/unmask events from this vq. */
-void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
-                         bool mask)
-{
-    struct VirtQueue *vvq = virtio_get_queue(vdev, n);
-    int r, index = n - hdev->vq_index;
-
-    assert(hdev->started);
-    assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
-
-    struct vhost_vring_file file = {
-        .index = index
-    };
-    if (mask) {
-        file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier);
-    } else {
-        file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq));
-    }
-    r = ioctl(hdev->control, VHOST_SET_VRING_CALL, &file);
-    assert(r >= 0);
-}
-
-/* Host notifiers must be enabled at this point. */
-int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
-{
-    int i, r;
-
-    hdev->started = true;
-
-    r = vhost_dev_set_features(hdev, hdev->log_enabled);
-    if (r < 0) {
-        goto fail_features;
-    }
-    r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem);
-    if (r < 0) {
-        r = -errno;
-        goto fail_mem;
-    }
-    for (i = 0; i < hdev->nvqs; ++i) {
-        r = vhost_virtqueue_start(hdev,
-                                  vdev,
-                                  hdev->vqs + i,
-                                  hdev->vq_index + i);
-        if (r < 0) {
-            goto fail_vq;
-        }
-    }
-
-    if (hdev->log_enabled) {
-        hdev->log_size = vhost_get_log_size(hdev);
-        hdev->log = hdev->log_size ?
-            g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL;
-        r = ioctl(hdev->control, VHOST_SET_LOG_BASE,
-                  (uint64_t)(unsigned long)hdev->log);
-        if (r < 0) {
-            r = -errno;
-            goto fail_log;
-        }
-    }
-
-    return 0;
-fail_log:
-fail_vq:
-    while (--i >= 0) {
-        vhost_virtqueue_stop(hdev,
-                             vdev,
-                             hdev->vqs + i,
-                             hdev->vq_index + i);
-    }
-    i = hdev->nvqs;
-fail_mem:
-fail_features:
-
-    hdev->started = false;
-    return r;
-}
-
-/* Host notifiers must be enabled at this point. */
-void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
-{
-    int i;
-
-    for (i = 0; i < hdev->nvqs; ++i) {
-        vhost_virtqueue_stop(hdev,
-                             vdev,
-                             hdev->vqs + i,
-                             hdev->vq_index + i);
-    }
-    vhost_log_sync_range(hdev, 0, ~0x0ull);
-
-    hdev->started = false;
-    g_free(hdev->log);
-    hdev->log = NULL;
-    hdev->log_size = 0;
-}
-