vfio/common: Move legacy VFIO backend code into separate container.c

Move all the code really dependent on the legacy VFIO container/group
into a separate file: container.c. What does remain in common.c is
the code related to VFIOAddressSpace, MemoryListeners, migration and
all other general operations.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

1 files changed, 16 insertions, 1139 deletions

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 95bc50b..9e61de0 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -46,9 +46,7 @@
 #include "migration/qemu-file.h"
 #include "sysemu/tpm.h"
 
-VFIOGroupList vfio_group_list =
-    QLIST_HEAD_INITIALIZER(vfio_group_list);
-static VFIODeviceList vfio_device_list =
+VFIODeviceList vfio_device_list =
     QLIST_HEAD_INITIALIZER(vfio_device_list);
 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
     QLIST_HEAD_INITIALIZER(vfio_address_spaces);
@@ -61,39 +59,13 @@ static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
  * initialized, this file descriptor is only released on QEMU exit and
  * we'll re-use it should another vfio device be attached before then.
  */
-static int vfio_kvm_device_fd = -1;
+int vfio_kvm_device_fd = -1;
 #endif
 
-static int vfio_ram_block_discard_disable(VFIOContainer *container, bool state)
-{
-    switch (container->iommu_type) {
-    case VFIO_TYPE1v2_IOMMU:
-    case VFIO_TYPE1_IOMMU:
-        /*
-         * We support coordinated discarding of RAM via the RamDiscardManager.
-         */
-        return ram_block_uncoordinated_discard_disable(state);
-    default:
-        /*
-         * VFIO_SPAPR_TCE_IOMMU most probably works just fine with
-         * RamDiscardManager, however, it is completely untested.
-         *
-         * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does
-         * completely the opposite of managing mapping/pinning dynamically as
-         * required by RamDiscardManager. We would have to special-case sections
-         * with a RamDiscardManager.
-         */
-        return ram_block_discard_disable(state);
-    }
-}
-
 /*
  * Device state interfaces
  */
 
-static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
-                                 uint64_t size, ram_addr_t ram_addr);
-
 bool vfio_mig_active(void)
 {
     VFIODevice *vbasedev;
@@ -238,7 +210,7 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
     return true;
 }
 
-static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
+bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
 {
     VFIODevice *vbasedev;
 
@@ -255,7 +227,7 @@ static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container)
  * Check if all VFIO devices are running and migration is active, which is
  * essentially equivalent to the migration being in pre-copy phase.
  */
-static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
+bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
 {
     VFIODevice *vbasedev;
 
@@ -280,150 +252,8 @@ static bool vfio_devices_all_running_and_mig_active(VFIOContainer *container)
     return true;
 }
 
-static int vfio_dma_unmap_bitmap(VFIOContainer *container,
-                                 hwaddr iova, ram_addr_t size,
-                                 IOMMUTLBEntry *iotlb)
-{
-    struct vfio_iommu_type1_dma_unmap *unmap;
-    struct vfio_bitmap *bitmap;
-    VFIOBitmap vbmap;
-    int ret;
-
-    ret = vfio_bitmap_alloc(&vbmap, size);
-    if (ret) {
-        return ret;
-    }
-
-    unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap));
-
-    unmap->argsz = sizeof(*unmap) + sizeof(*bitmap);
-    unmap->iova = iova;
-    unmap->size = size;
-    unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP;
-    bitmap = (struct vfio_bitmap *)&unmap->data;
-
-    /*
-     * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
-     * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize
-     * to qemu_real_host_page_size.
-     */
-    bitmap->pgsize = qemu_real_host_page_size();
-    bitmap->size = vbmap.size;
-    bitmap->data = (__u64 *)vbmap.bitmap;
-
-    if (vbmap.size > container->max_dirty_bitmap_size) {
-        error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, vbmap.size);
-        ret = -E2BIG;
-        goto unmap_exit;
-    }
-
-    ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap);
-    if (!ret) {
-        cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap,
-                iotlb->translated_addr, vbmap.pages);
-    } else {
-        error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m");
-    }
-
-unmap_exit:
-    g_free(unmap);
-    g_free(vbmap.bitmap);
-
-    return ret;
-}
-
-/*
- * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86
- */
-static int vfio_dma_unmap(VFIOContainer *container,
-                          hwaddr iova, ram_addr_t size,
-                          IOMMUTLBEntry *iotlb)
-{
-    struct vfio_iommu_type1_dma_unmap unmap = {
-        .argsz = sizeof(unmap),
-        .flags = 0,
-        .iova = iova,
-        .size = size,
-    };
-    bool need_dirty_sync = false;
-    int ret;
-
-    if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
-        if (!vfio_devices_all_device_dirty_tracking(container) &&
-            container->dirty_pages_supported) {
-            return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
-        }
-
-        need_dirty_sync = true;
-    }
-
-    while (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) {
-        /*
-         * The type1 backend has an off-by-one bug in the kernel (71a7d3d78e3c
-         * v4.15) where an overflow in its wrap-around check prevents us from
-         * unmapping the last page of the address space.  Test for the error
-         * condition and re-try the unmap excluding the last page.  The
-         * expectation is that we've never mapped the last page anyway and this
-         * unmap request comes via vIOMMU support which also makes it unlikely
-         * that this page is used.  This bug was introduced well after type1 v2
-         * support was introduced, so we shouldn't need to test for v1.  A fix
-         * is queued for kernel v5.0 so this workaround can be removed once
-         * affected kernels are sufficiently deprecated.
-         */
-        if (errno == EINVAL && unmap.size && !(unmap.iova + unmap.size) &&
-            container->iommu_type == VFIO_TYPE1v2_IOMMU) {
-            trace_vfio_dma_unmap_overflow_workaround();
-            unmap.size -= 1ULL << ctz64(container->pgsizes);
-            continue;
-        }
-        error_report("VFIO_UNMAP_DMA failed: %s", strerror(errno));
-        return -errno;
-    }
-
-    if (need_dirty_sync) {
-        ret = vfio_get_dirty_bitmap(container, iova, size,
-                                    iotlb->translated_addr);
-        if (ret) {
-            return ret;
-        }
-    }
-
-    return 0;
-}
-
-static int vfio_dma_map(VFIOContainer *container, hwaddr iova,
-                        ram_addr_t size, void *vaddr, bool readonly)
-{
-    struct vfio_iommu_type1_dma_map map = {
-        .argsz = sizeof(map),
-        .flags = VFIO_DMA_MAP_FLAG_READ,
-        .vaddr = (__u64)(uintptr_t)vaddr,
-        .iova = iova,
-        .size = size,
-    };
-
-    if (!readonly) {
-        map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
-    }
-
-    /*
-     * Try the mapping, if it fails with EBUSY, unmap the region and try
-     * again.  This shouldn't be necessary, but we sometimes see it in
-     * the VGA ROM space.
-     */
-    if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
-        (errno == EBUSY && vfio_dma_unmap(container, iova, size, NULL) == 0 &&
-         ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
-        return 0;
-    }
-
-    error_report("VFIO_MAP_DMA failed: %s", strerror(errno));
-    return -errno;
-}
-
-static void vfio_host_win_add(VFIOContainer *container,
-                              hwaddr min_iova, hwaddr max_iova,
-                              uint64_t iova_pgsizes)
+void vfio_host_win_add(VFIOContainer *container, hwaddr min_iova,
+                       hwaddr max_iova, uint64_t iova_pgsizes)
 {
     VFIOHostDMAWindow *hostwin;
 
@@ -444,8 +274,8 @@ static void vfio_host_win_add(VFIOContainer *container,
     QLIST_INSERT_HEAD(&container->hostwin_list, hostwin, hostwin_next);
 }
 
-static int vfio_host_win_del(VFIOContainer *container, hwaddr min_iova,
-                             hwaddr max_iova)
+int vfio_host_win_del(VFIOContainer *container,
+                      hwaddr min_iova, hwaddr max_iova)
 {
     VFIOHostDMAWindow *hostwin;
 
@@ -794,92 +624,6 @@ static bool vfio_get_section_iova_range(VFIOContainer *container,
     return true;
 }
 
-static int vfio_container_add_section_window(VFIOContainer *container,
-                                             MemoryRegionSection *section,
-                                             Error **errp)
-{
-    VFIOHostDMAWindow *hostwin;
-    hwaddr pgsize = 0;
-    int ret;
-
-    if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
-        return 0;
-    }
-
-    /* For now intersections are not allowed, we may relax this later */
-    QLIST_FOREACH(hostwin, &container->hostwin_list, hostwin_next) {
-        if (ranges_overlap(hostwin->min_iova,
-                           hostwin->max_iova - hostwin->min_iova + 1,
-                           section->offset_within_address_space,
-                           int128_get64(section->size))) {
-            error_setg(errp,
-                "region [0x%"PRIx64",0x%"PRIx64"] overlaps with existing"
-                "host DMA window [0x%"PRIx64",0x%"PRIx64"]",
-                section->offset_within_address_space,
-                section->offset_within_address_space +
-                    int128_get64(section->size) - 1,
-                hostwin->min_iova, hostwin->max_iova);
-            return -EINVAL;
-        }
-    }
-
-    ret = vfio_spapr_create_window(container, section, &pgsize);
-    if (ret) {
-        error_setg_errno(errp, -ret, "Failed to create SPAPR window");
-        return ret;
-    }
-
-    vfio_host_win_add(container, section->offset_within_address_space,
-                      section->offset_within_address_space +
-                      int128_get64(section->size) - 1, pgsize);
-#ifdef CONFIG_KVM
-    if (kvm_enabled()) {
-        VFIOGroup *group;
-        IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
-        struct kvm_vfio_spapr_tce param;
-        struct kvm_device_attr attr = {
-            .group = KVM_DEV_VFIO_GROUP,
-            .attr = KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE,
-            .addr = (uint64_t)(unsigned long)&param,
-        };
-
-        if (!memory_region_iommu_get_attr(iommu_mr, IOMMU_ATTR_SPAPR_TCE_FD,
-                                          &param.tablefd)) {
-            QLIST_FOREACH(group, &container->group_list, container_next) {
-                param.groupfd = group->fd;
-                if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
-                    error_setg_errno(errp, errno,
-                                     "vfio: failed GROUP_SET_SPAPR_TCE for "
-                                     "KVM VFIO device %d and group fd %d",
-                                     param.tablefd, param.groupfd);
-                    return -errno;
-                }
-                trace_vfio_spapr_group_attach(param.groupfd, param.tablefd);
-            }
-        }
-    }
-#endif
-    return 0;
-}
-
-static void vfio_container_del_section_window(VFIOContainer *container,
-                                              MemoryRegionSection *section)
-{
-    if (container->iommu_type != VFIO_SPAPR_TCE_v2_IOMMU) {
-        return;
-    }
-
-    vfio_spapr_remove_window(container,
-                             section->offset_within_address_space);
-    if (vfio_host_win_del(container,
-                          section->offset_within_address_space,
-                          section->offset_within_address_space +
-                          int128_get64(section->size) - 1) < 0) {
-        hw_error("%s: Cannot delete missing window at %"HWADDR_PRIx,
-                 __func__, section->offset_within_address_space);
-    }
-}
-
 static void vfio_listener_region_add(MemoryListener *listener,
                                      MemoryRegionSection *section)
 {
@@ -1127,33 +871,6 @@ static void vfio_listener_region_del(MemoryListener *listener,
     vfio_container_del_section_window(container, section);
 }
 
-static int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
-{
-    int ret;
-    struct vfio_iommu_type1_dirty_bitmap dirty = {
-        .argsz = sizeof(dirty),
-    };
-
-    if (!container->dirty_pages_supported) {
-        return 0;
-    }
-
-    if (start) {
-        dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
-    } else {
-        dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP;
-    }
-
-    ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty);
-    if (ret) {
-        ret = -errno;
-        error_report("Failed to set dirty tracking flag 0x%x errno: %d",
-                     dirty.flags, errno);
-    }
-
-    return ret;
-}
-
 typedef struct VFIODirtyRanges {
     hwaddr min32;
     hwaddr max32;
@@ -1473,9 +1190,9 @@ static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
     return 0;
 }
 
-static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
-                                           VFIOBitmap *vbmap, hwaddr iova,
-                                           hwaddr size)
+int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
+                                    VFIOBitmap *vbmap, hwaddr iova,
+                                    hwaddr size)
 {
     VFIODevice *vbasedev;
     int ret;
@@ -1496,45 +1213,8 @@ static int vfio_devices_query_dirty_bitmap(VFIOContainer *container,
     return 0;
 }
 
-static int vfio_query_dirty_bitmap(VFIOContainer *container, VFIOBitmap *vbmap,
-                                   hwaddr iova, hwaddr size)
-{
-    struct vfio_iommu_type1_dirty_bitmap *dbitmap;
-    struct vfio_iommu_type1_dirty_bitmap_get *range;
-    int ret;
-
-    dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
-
-    dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
-    dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP;
-    range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data;
-    range->iova = iova;
-    range->size = size;
-
-    /*
-     * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
-     * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize
-     * to qemu_real_host_page_size.
-     */
-    range->bitmap.pgsize = qemu_real_host_page_size();
-    range->bitmap.size = vbmap->size;
-    range->bitmap.data = (__u64 *)vbmap->bitmap;
-
-    ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap);
-    if (ret) {
-        ret = -errno;
-        error_report("Failed to get dirty bitmap for iova: 0x%"PRIx64
-                " size: 0x%"PRIx64" err: %d", (uint64_t)range->iova,
-                (uint64_t)range->size, errno);
-    }
-
-    g_free(dbitmap);
-
-    return ret;
-}
-
-static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
-                                 uint64_t size, ram_addr_t ram_addr)
+int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
+                          uint64_t size, ram_addr_t ram_addr)
 {
     bool all_device_dirty_tracking =
         vfio_devices_all_device_dirty_tracking(container);
@@ -1723,7 +1403,7 @@ static void vfio_listener_log_sync(MemoryListener *listener,
     }
 }
 
-static const MemoryListener vfio_memory_listener = {
+const MemoryListener vfio_memory_listener = {
     .name = "vfio",
     .region_add = vfio_listener_region_add,
     .region_del = vfio_listener_region_del,
@@ -1732,45 +1412,6 @@ static const MemoryListener vfio_memory_listener = {
     .log_sync = vfio_listener_log_sync,
 };
 
-static void vfio_listener_release(VFIOContainer *container)
-{
-    memory_listener_unregister(&container->listener);
-    if (container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
-        memory_listener_unregister(&container->prereg_listener);
-    }
-}
-
-static struct vfio_info_cap_header *
-vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
-{
-    if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
-        return NULL;
-    }
-
-    return vfio_get_cap((void *)info, info->cap_offset, id);
-}
-
-bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
-                             unsigned int *avail)
-{
-    struct vfio_info_cap_header *hdr;
-    struct vfio_iommu_type1_info_dma_avail *cap;
-
-    /* If the capability cannot be found, assume no DMA limiting */
-    hdr = vfio_get_iommu_type1_info_cap(info,
-                                        VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
-    if (hdr == NULL) {
-        return false;
-    }
-
-    if (avail != NULL) {
-        cap = (void *) hdr;
-        *avail = cap->avail;
-    }
-
-    return true;
-}
-
 void vfio_reset_handler(void *opaque)
 {
     VFIODevice *vbasedev;
@@ -1846,25 +1487,7 @@ int vfio_kvm_device_del_fd(int fd, Error **errp)
     return 0;
 }
 
-static void vfio_kvm_device_add_group(VFIOGroup *group)
-{
-    Error *err = NULL;
-
-    if (vfio_kvm_device_add_fd(group->fd, &err)) {
-        error_reportf_err(err, "group ID %d: ", group->groupid);
-    }
-}
-
-static void vfio_kvm_device_del_group(VFIOGroup *group)
-{
-    Error *err = NULL;
-
-    if (vfio_kvm_device_del_fd(group->fd, &err)) {
-        error_reportf_err(err, "group ID %d: ", group->groupid);
-    }
-}
-
-static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
+VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
 {
     VFIOAddressSpace *space;
 
@@ -1888,7 +1511,7 @@ static VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
     return space;
 }
 
-static void vfio_put_address_space(VFIOAddressSpace *space)
+void vfio_put_address_space(VFIOAddressSpace *space)
 {
     if (QLIST_EMPTY(&space->containers)) {
         QLIST_REMOVE(space, list);
@@ -1899,499 +1522,6 @@ static void vfio_put_address_space(VFIOAddressSpace *space)
     }
 }
 
-/*
- * vfio_get_iommu_type - selects the richest iommu_type (v2 first)
- */
-static int vfio_get_iommu_type(VFIOContainer *container,
-                               Error **errp)
-{
-    int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU,
-                          VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU };
-    int i;
-
-    for (i = 0; i < ARRAY_SIZE(iommu_types); i++) {
-        if (ioctl(container->fd, VFIO_CHECK_EXTENSION, iommu_types[i])) {
-            return iommu_types[i];
-        }
-    }
-    error_setg(errp, "No available IOMMU models");
-    return -EINVAL;
-}
-
-static int vfio_init_container(VFIOContainer *container, int group_fd,
-                               Error **errp)
-{
-    int iommu_type, ret;
-
-    iommu_type = vfio_get_iommu_type(container, errp);
-    if (iommu_type < 0) {
-        return iommu_type;
-    }
-
-    ret = ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container->fd);
-    if (ret) {
-        error_setg_errno(errp, errno, "Failed to set group container");
-        return -errno;
-    }
-
-    while (ioctl(container->fd, VFIO_SET_IOMMU, iommu_type)) {
-        if (iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) {
-            /*
-             * On sPAPR, despite the IOMMU subdriver always advertises v1 and
-             * v2, the running platform may not support v2 and there is no
-             * way to guess it until an IOMMU group gets added to the container.
-             * So in case it fails with v2, try v1 as a fallback.
-             */
-            iommu_type = VFIO_SPAPR_TCE_IOMMU;
-            continue;
-        }
-        error_setg_errno(errp, errno, "Failed to set iommu for container");
-        return -errno;
-    }
-
-    container->iommu_type = iommu_type;
-    return 0;
-}
-
-static int vfio_get_iommu_info(VFIOContainer *container,
-                               struct vfio_iommu_type1_info **info)
-{
-
-    size_t argsz = sizeof(struct vfio_iommu_type1_info);
-
-    *info = g_new0(struct vfio_iommu_type1_info, 1);
-again:
-    (*info)->argsz = argsz;
-
-    if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) {
-        g_free(*info);
-        *info = NULL;
-        return -errno;
-    }
-
-    if (((*info)->argsz > argsz)) {
-        argsz = (*info)->argsz;
-        *info = g_realloc(*info, argsz);
-        goto again;
-    }
-
-    return 0;
-}
-
-static struct vfio_info_cap_header *
-vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
-{
-    struct vfio_info_cap_header *hdr;
-    void *ptr = info;
-
-    if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
-        return NULL;
-    }
-
-    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
-        if (hdr->id == id) {
-            return hdr;
-        }
-    }
-
-    return NULL;
-}
-
-static void vfio_get_iommu_info_migration(VFIOContainer *container,
-                                         struct vfio_iommu_type1_info *info)
-{
-    struct vfio_info_cap_header *hdr;
-    struct vfio_iommu_type1_info_cap_migration *cap_mig;
-
-    hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION);
-    if (!hdr) {
-        return;
-    }
-
-    cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration,
-                            header);
-
-    /*
-     * cpu_physical_memory_set_dirty_lebitmap() supports pages in bitmap of
-     * qemu_real_host_page_size to mark those dirty.
-     */
-    if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) {
-        container->dirty_pages_supported = true;
-        container->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size;
-        container->dirty_pgsizes = cap_mig->pgsize_bitmap;
-    }
-}
-
-static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
-                                  Error **errp)
-{
-    VFIOContainer *container;
-    int ret, fd;
-    VFIOAddressSpace *space;
-
-    space = vfio_get_address_space(as);
-
-    /*
-     * VFIO is currently incompatible with discarding of RAM insofar as the
-     * madvise to purge (zap) the page from QEMU's address space does not
-     * interact with the memory API and therefore leaves stale virtual to
-     * physical mappings in the IOMMU if the page was previously pinned.  We
-     * therefore set discarding broken for each group added to a container,
-     * whether the container is used individually or shared.  This provides
-     * us with options to allow devices within a group to opt-in and allow
-     * discarding, so long as it is done consistently for a group (for instance
-     * if the device is an mdev device where it is known that the host vendor
-     * driver will never pin pages outside of the working set of the guest
-     * driver, which would thus not be discarding candidates).
-     *
-     * The first opportunity to induce pinning occurs here where we attempt to
-     * attach the group to existing containers within the AddressSpace.  If any
-     * pages are already zapped from the virtual address space, such as from
-     * previous discards, new pinning will cause valid mappings to be
-     * re-established.  Likewise, when the overall MemoryListener for a new
-     * container is registered, a replay of mappings within the AddressSpace
-     * will occur, re-establishing any previously zapped pages as well.
-     *
-     * Especially virtio-balloon is currently only prevented from discarding
-     * new memory, it will not yet set ram_block_discard_set_required() and
-     * therefore, neither stops us here or deals with the sudden memory
-     * consumption of inflated memory.
-     *
-     * We do support discarding of memory coordinated via the RamDiscardManager
-     * with some IOMMU types. vfio_ram_block_discard_disable() handles the
-     * details once we know which type of IOMMU we are using.
-     */
-
-    QLIST_FOREACH(container, &space->containers, next) {
-        if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) {
-            ret = vfio_ram_block_discard_disable(container, true);
-            if (ret) {
-                error_setg_errno(errp, -ret,
-                                 "Cannot set discarding of RAM broken");
-                if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER,
-                          &container->fd)) {
-                    error_report("vfio: error disconnecting group %d from"
-                                 " container", group->groupid);
-                }
-                return ret;
-            }
-            group->container = container;
-            QLIST_INSERT_HEAD(&container->group_list, group, container_next);
-            vfio_kvm_device_add_group(group);
-            return 0;
-        }
-    }
-
-    fd = qemu_open_old("/dev/vfio/vfio", O_RDWR);
-    if (fd < 0) {
-        error_setg_errno(errp, errno, "failed to open /dev/vfio/vfio");
-        ret = -errno;
-        goto put_space_exit;
-    }
-
-    ret = ioctl(fd, VFIO_GET_API_VERSION);
-    if (ret != VFIO_API_VERSION) {
-        error_setg(errp, "supported vfio version: %d, "
-                   "reported version: %d", VFIO_API_VERSION, ret);
-        ret = -EINVAL;
-        goto close_fd_exit;
-    }
-
-    container = g_malloc0(sizeof(*container));
-    container->space = space;
-    container->fd = fd;
-    container->error = NULL;
-    container->dirty_pages_supported = false;
-    container->dma_max_mappings = 0;
-    QLIST_INIT(&container->giommu_list);
-    QLIST_INIT(&container->hostwin_list);
-    QLIST_INIT(&container->vrdl_list);
-
-    ret = vfio_init_container(container, group->fd, errp);
-    if (ret) {
-        goto free_container_exit;
-    }
-
-    ret = vfio_ram_block_discard_disable(container, true);
-    if (ret) {
-        error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken");
-        goto free_container_exit;
-    }
-
-    switch (container->iommu_type) {
-    case VFIO_TYPE1v2_IOMMU:
-    case VFIO_TYPE1_IOMMU:
-    {
-        struct vfio_iommu_type1_info *info;
-
-        ret = vfio_get_iommu_info(container, &info);
-        if (ret) {
-            error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info");
-            goto enable_discards_exit;
-        }
-
-        if (info->flags & VFIO_IOMMU_INFO_PGSIZES) {
-            container->pgsizes = info->iova_pgsizes;
-        } else {
-            container->pgsizes = qemu_real_host_page_size();
-        }
-
-        if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
-            container->dma_max_mappings = 65535;
-        }
-        vfio_get_iommu_info_migration(container, info);
-        g_free(info);
-
-        /*
-         * FIXME: We should parse VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
-         * information to get the actual window extent rather than assume
-         * a 64-bit IOVA address space.
-         */
-        vfio_host_win_add(container, 0, (hwaddr)-1, container->pgsizes);
-
-        break;
-    }
-    case VFIO_SPAPR_TCE_v2_IOMMU:
-    case VFIO_SPAPR_TCE_IOMMU:
-    {
-        struct vfio_iommu_spapr_tce_info info;
-        bool v2 = container->iommu_type == VFIO_SPAPR_TCE_v2_IOMMU;
-
-        /*
-         * The host kernel code implementing VFIO_IOMMU_DISABLE is called
-         * when container fd is closed so we do not call it explicitly
-         * in this file.
-         */
-        if (!v2) {
-            ret = ioctl(fd, VFIO_IOMMU_ENABLE);
-            if (ret) {
-                error_setg_errno(errp, errno, "failed to enable container");
-                ret = -errno;
-                goto enable_discards_exit;
-            }
-        } else {
-            container->prereg_listener = vfio_prereg_listener;
-
-            memory_listener_register(&container->prereg_listener,
-                                     &address_space_memory);
-            if (container->error) {
-                memory_listener_unregister(&container->prereg_listener);
-                ret = -1;
-                error_propagate_prepend(errp, container->error,
-                    "RAM memory listener initialization failed: ");
-                goto enable_discards_exit;
-            }
-        }
-
-        info.argsz = sizeof(info);
-        ret = ioctl(fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
-        if (ret) {
-            error_setg_errno(errp, errno,
-                             "VFIO_IOMMU_SPAPR_TCE_GET_INFO failed");
-            ret = -errno;
-            if (v2) {
-                memory_listener_unregister(&container->prereg_listener);
-            }
-            goto enable_discards_exit;
-        }
-
-        if (v2) {
-            container->pgsizes = info.ddw.pgsizes;
-            /*
-             * There is a default window in just created container.
-             * To make region_add/del simpler, we better remove this
-             * window now and let those iommu_listener callbacks
-             * create/remove them when needed.
-             */
-            ret = vfio_spapr_remove_window(container, info.dma32_window_start);
-            if (ret) {
-                error_setg_errno(errp, -ret,
-                                 "failed to remove existing window");
-                goto enable_discards_exit;
-            }
-        } else {
-            /* The default table uses 4K pages */
-            container->pgsizes = 0x1000;
-            vfio_host_win_add(container, info.dma32_window_start,
-                              info.dma32_window_start +
-                              info.dma32_window_size - 1,
-                              0x1000);
-        }
-    }
-    }
-
-    vfio_kvm_device_add_group(group);
-
-    QLIST_INIT(&container->group_list);
-    QLIST_INSERT_HEAD(&space->containers, container, next);
-
-    group->container = container;
-    QLIST_INSERT_HEAD(&container->group_list, group, container_next);
-
-    container->listener = vfio_memory_listener;
-
-    memory_listener_register(&container->listener, container->space->as);
-
-    if (container->error) {
-        ret = -1;
-        error_propagate_prepend(errp, container->error,
-            "memory listener initialization failed: ");
-        goto listener_release_exit;
-    }
-
-    container->initialized = true;
-
-    return 0;
-listener_release_exit:
-    QLIST_REMOVE(group, container_next);
-    QLIST_REMOVE(container, next);
-    vfio_kvm_device_del_group(group);
-    vfio_listener_release(container);
-
-enable_discards_exit:
-    vfio_ram_block_discard_disable(container, false);
-
-free_container_exit:
-    g_free(container);
-
-close_fd_exit:
-    close(fd);
-
-put_space_exit:
-    vfio_put_address_space(space);
-
-    return ret;
-}
-
-static void vfio_disconnect_container(VFIOGroup *group)
-{
-    VFIOContainer *container = group->container;
-
-    QLIST_REMOVE(group, container_next);
-    group->container = NULL;
-
-    /*
-     * Explicitly release the listener first before unset container,
-     * since unset may destroy the backend container if it's the last
-     * group.
-     */
-    if (QLIST_EMPTY(&container->group_list)) {
-        vfio_listener_release(container);
-    }
-
-    if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) {
-        error_report("vfio: error disconnecting group %d from container",
-                     group->groupid);
-    }
-
-    if (QLIST_EMPTY(&container->group_list)) {
-        VFIOAddressSpace *space = container->space;
-        VFIOGuestIOMMU *giommu, *tmp;
-        VFIOHostDMAWindow *hostwin, *next;
-
-        QLIST_REMOVE(container, next);
-
-        QLIST_FOREACH_SAFE(giommu, &container->giommu_list, giommu_next, tmp) {
-            memory_region_unregister_iommu_notifier(
-                    MEMORY_REGION(giommu->iommu_mr), &giommu->n);
-            QLIST_REMOVE(giommu, giommu_next);
-            g_free(giommu);
-        }
-
-        QLIST_FOREACH_SAFE(hostwin, &container->hostwin_list, hostwin_next,
-                           next) {
-            QLIST_REMOVE(hostwin, hostwin_next);
-            g_free(hostwin);
-        }
-
-        trace_vfio_disconnect_container(container->fd);
-        close(container->fd);
-        g_free(container);
-
-        vfio_put_address_space(space);
-    }
-}
-
-static VFIOGroup *vfio_get_group(int groupid, AddressSpace *as, Error **errp)
-{
-    VFIOGroup *group;
-    char path[32];
-    struct vfio_group_status status = { .argsz = sizeof(status) };
-
-    QLIST_FOREACH(group, &vfio_group_list, next) {
-        if (group->groupid == groupid) {
-            /* Found it.  Now is it already in the right context? */
-            if (group->container->space->as == as) {
-                return group;
-            } else {
-                error_setg(errp, "group %d used in multiple address spaces",
-                           group->groupid);
-                return NULL;
-            }
-        }
-    }
-
-    group = g_malloc0(sizeof(*group));
-
-    snprintf(path, sizeof(path), "/dev/vfio/%d", groupid);
-    group->fd = qemu_open_old(path, O_RDWR);
-    if (group->fd < 0) {
-        error_setg_errno(errp, errno, "failed to open %s", path);
-        goto free_group_exit;
-    }
-
-    if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) {
-        error_setg_errno(errp, errno, "failed to get group %d status", groupid);
-        goto close_fd_exit;
-    }
-
-    if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) {
-        error_setg(errp, "group %d is not viable", groupid);
-        error_append_hint(errp,
-                          "Please ensure all devices within the iommu_group "
-                          "are bound to their vfio bus driver.\n");
-        goto close_fd_exit;
-    }
-
-    group->groupid = groupid;
-    QLIST_INIT(&group->device_list);
-
-    if (vfio_connect_container(group, as, errp)) {
-        error_prepend(errp, "failed to setup container for group %d: ",
-                      groupid);
-        goto close_fd_exit;
-    }
-
-    QLIST_INSERT_HEAD(&vfio_group_list, group, next);
-
-    return group;
-
-close_fd_exit:
-    close(group->fd);
-
-free_group_exit:
-    g_free(group);
-
-    return NULL;
-}
-
-static void vfio_put_group(VFIOGroup *group)
-{
-    if (!group || !QLIST_EMPTY(&group->device_list)) {
-        return;
-    }
-
-    if (!group->ram_block_discard_allowed) {
-        vfio_ram_block_discard_disable(group->container, false);
-    }
-    vfio_kvm_device_del_group(group);
-    vfio_disconnect_container(group);
-    QLIST_REMOVE(group, next);
-    trace_vfio_put_group(group->fd);
-    close(group->fd);
-    g_free(group);
-}
-
 struct vfio_device_info *vfio_get_device_info(int fd)
 {
     struct vfio_device_info *info;
@@ -2415,256 +1545,3 @@ retry:
 
     return info;
 }
-
-static int vfio_get_device(VFIOGroup *group, const char *name,
-                           VFIODevice *vbasedev, Error **errp)
-{
-    g_autofree struct vfio_device_info *info = NULL;
-    int fd;
-
-    fd = ioctl(group->fd, VFIO_GROUP_GET_DEVICE_FD, name);
-    if (fd < 0) {
-        error_setg_errno(errp, errno, "error getting device from group %d",
-                         group->groupid);
-        error_append_hint(errp,
-                      "Verify all devices in group %d are bound to vfio-<bus> "
-                      "or pci-stub and not already in use\n", group->groupid);
-        return fd;
-    }
-
-    info = vfio_get_device_info(fd);
-    if (!info) {
-        error_setg_errno(errp, errno, "error getting device info");
-        close(fd);
-        return -1;
-    }
-
-    /*
-     * Set discarding of RAM as not broken for this group if the driver knows
-     * the device operates compatibly with discarding.  Setting must be
-     * consistent per group, but since compatibility is really only possible
-     * with mdev currently, we expect singleton groups.
-     */
-    if (vbasedev->ram_block_discard_allowed !=
-        group->ram_block_discard_allowed) {
-        if (!QLIST_EMPTY(&group->device_list)) {
-            error_setg(errp, "Inconsistent setting of support for discarding "
-                       "RAM (e.g., balloon) within group");
-            close(fd);
-            return -1;
-        }
-
-        if (!group->ram_block_discard_allowed) {
-            group->ram_block_discard_allowed = true;
-            vfio_ram_block_discard_disable(group->container, false);
-        }
-    }
-
-    vbasedev->fd = fd;
-    vbasedev->group = group;
-    QLIST_INSERT_HEAD(&group->device_list, vbasedev, next);
-
-    vbasedev->num_irqs = info->num_irqs;
-    vbasedev->num_regions = info->num_regions;
-    vbasedev->flags = info->flags;
-
-    trace_vfio_get_device(name, info->flags, info->num_regions, info->num_irqs);
-
-    vbasedev->reset_works = !!(info->flags & VFIO_DEVICE_FLAGS_RESET);
-
-    return 0;
-}
-
-static void vfio_put_base_device(VFIODevice *vbasedev)
-{
-    if (!vbasedev->group) {
-        return;
-    }
-    QLIST_REMOVE(vbasedev, next);
-    vbasedev->group = NULL;
-    trace_vfio_put_base_device(vbasedev->fd);
-    close(vbasedev->fd);
-}
-
-/*
- * Interfaces for IBM EEH (Enhanced Error Handling)
- */
-static bool vfio_eeh_container_ok(VFIOContainer *container)
-{
-    /*
-     * As of 2016-03-04 (linux-4.5) the host kernel EEH/VFIO
-     * implementation is broken if there are multiple groups in a
-     * container.  The hardware works in units of Partitionable
-     * Endpoints (== IOMMU groups) and the EEH operations naively
-     * iterate across all groups in the container, without any logic
-     * to make sure the groups have their state synchronized.  For
-     * certain operations (ENABLE) that might be ok, until an error
-     * occurs, but for others (GET_STATE) it's clearly broken.
-     */
-
-    /*
-     * XXX Once fixed kernels exist, test for them here
-     */
-
-    if (QLIST_EMPTY(&container->group_list)) {
-        return false;
-    }
-
-    if (QLIST_NEXT(QLIST_FIRST(&container->group_list), container_next)) {
-        return false;
-    }
-
-    return true;
-}
-
-static int vfio_eeh_container_op(VFIOContainer *container, uint32_t op)
-{
-    struct vfio_eeh_pe_op pe_op = {
-        .argsz = sizeof(pe_op),
-        .op = op,
-    };
-    int ret;
-
-    if (!vfio_eeh_container_ok(container)) {
-        error_report("vfio/eeh: EEH_PE_OP 0x%x: "
-                     "kernel requires a container with exactly one group", op);
-        return -EPERM;
-    }
-
-    ret = ioctl(container->fd, VFIO_EEH_PE_OP, &pe_op);
-    if (ret < 0) {
-        error_report("vfio/eeh: EEH_PE_OP 0x%x failed: %m", op);
-        return -errno;
-    }
-
-    return ret;
-}
-
-static VFIOContainer *vfio_eeh_as_container(AddressSpace *as)
-{
-    VFIOAddressSpace *space = vfio_get_address_space(as);
-    VFIOContainer *container = NULL;
-
-    if (QLIST_EMPTY(&space->containers)) {
-        /* No containers to act on */
-        goto out;
-    }
-
-    container = QLIST_FIRST(&space->containers);
-
-    if (QLIST_NEXT(container, next)) {
-        /* We don't yet have logic to synchronize EEH state across
-         * multiple containers */
-        container = NULL;
-        goto out;
-    }
-
-out:
-    vfio_put_address_space(space);
-    return container;
-}
-
-bool vfio_eeh_as_ok(AddressSpace *as)
-{
-    VFIOContainer *container = vfio_eeh_as_container(as);
-
-    return (container != NULL) && vfio_eeh_container_ok(container);
-}
-
-int vfio_eeh_as_op(AddressSpace *as, uint32_t op)
-{
-    VFIOContainer *container = vfio_eeh_as_container(as);
-
-    if (!container) {
-        return -ENODEV;
-    }
-    return vfio_eeh_container_op(container, op);
-}
-
-static int vfio_device_groupid(VFIODevice *vbasedev, Error **errp)
-{
-    char *tmp, group_path[PATH_MAX], *group_name;
-    int ret, groupid;
-    ssize_t len;
-
-    tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev);
-    len = readlink(tmp, group_path, sizeof(group_path));
-    g_free(tmp);
-
-    if (len <= 0 || len >= sizeof(group_path)) {
-        ret = len < 0 ? -errno : -ENAMETOOLONG;
-        error_setg_errno(errp, -ret, "no iommu_group found");
-        return ret;
-    }
-
-    group_path[len] = 0;
-
-    group_name = basename(group_path);
-    if (sscanf(group_name, "%d", &groupid) != 1) {
-        error_setg_errno(errp, errno, "failed to read %s", group_path);
-        return -errno;
-    }
-    return groupid;
-}
-
-/*
- * vfio_attach_device: attach a device to a security context
- * @name and @vbasedev->name are likely to be different depending
- * on the type of the device, hence the need for passing @name
- */
-int vfio_attach_device(char *name, VFIODevice *vbasedev,
-                       AddressSpace *as, Error **errp)
-{
-    int groupid = vfio_device_groupid(vbasedev, errp);
-    VFIODevice *vbasedev_iter;
-    VFIOGroup *group;
-    VFIOContainer *container;
-    int ret;
-
-    if (groupid < 0) {
-        return groupid;
-    }
-
-    trace_vfio_attach_device(vbasedev->name, groupid);
-
-    group = vfio_get_group(groupid, as, errp);
-    if (!group) {
-        return -ENOENT;
-    }
-
-    QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
-        if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) {
-            error_setg(errp, "device is already attached");
-            vfio_put_group(group);
-            return -EBUSY;
-        }
-    }
-    ret = vfio_get_device(group, name, vbasedev, errp);
-    if (ret) {
-        vfio_put_group(group);
-        return ret;
-    }
-
-    container = group->container;
-    vbasedev->container = container;
-    QLIST_INSERT_HEAD(&container->device_list, vbasedev, container_next);
-    QLIST_INSERT_HEAD(&vfio_device_list, vbasedev, global_next);
-
-    return ret;
-}
-
-void vfio_detach_device(VFIODevice *vbasedev)
-{
-    VFIOGroup *group = vbasedev->group;
-
-    if (!vbasedev->container) {
-        return;
-    }
-
-    QLIST_REMOVE(vbasedev, global_next);
-    QLIST_REMOVE(vbasedev, container_next);
-    vbasedev->container = NULL;
-    trace_vfio_detach_device(vbasedev->name, group->groupid);
-    vfio_put_base_device(vbasedev);
-    vfio_put_group(group);
-}