> -----Original Message-----
> From: Qemu-devel [mailto:qemu-devel-
> bounces+yan.y.zhao=intel....@nongnu.org] On Behalf Of Kirti Wankhede
> Sent: Wednesday, November 21, 2018 4:40 AM
> To: alex.william...@redhat.com; c...@nvidia.com
> Cc: zhengxiao...@alibaba-inc.com; Tian, Kevin <kevin.t...@intel.com>; Liu, Yi
> L
> <yi.l....@intel.com>; eskul...@redhat.com; Yang, Ziye <ziye.y...@intel.com>;
> qemu-devel@nongnu.org; coh...@redhat.com; shuangtai....@alibaba-inc.com;
> dgilb...@redhat.com; Wang, Zhi A <zhi.a.w...@intel.com>;
> mlevi...@redhat.com; pa...@linux.ibm.com; a...@ozlabs.ru; Kirti Wankhede
> <kwankh...@nvidia.com>; eau...@redhat.com; fel...@nutanix.com;
> jonathan.dav...@nutanix.com; Liu, Changpeng <changpeng....@intel.com>;
> ken....@amd.com
> Subject: [Qemu-devel] [PATCH 3/5] Add migration functions for VFIO devices
>
> - Migration function are implemented for VFIO_DEVICE_TYPE_PCI device.
> - Added SaveVMHandlers and implemented all basic functions required for live
> migration.
> - Added VM state change handler to know running or stopped state of VM.
> - Added migration state change notifier to get notification on migration state
> change. This state is translated to VFIO device state and conveyed to vendor
> driver.
> - VFIO device supportd migration or not is decided based of migration region
> query. If migration region query is successful then migration is supported
> else migration is blocked.
> - Structure vfio_device_migration_info is mapped at 0th offset of migration
> region and should always trapped by VFIO device's driver. Added both type of
> access support, trapped or mmapped, for data section of the region.
> - To save device state, read data offset and size using structure
> vfio_device_migration_info.data, accordingly copy data from the region.
> - To restore device state, write data offset and size in the structure and
> write
> data in the region.
> - To get dirty page bitmap, write start address and pfn count then read count
> of
> pfns copied and accordingly read those from the rest of the region or mmaped
> part of the region. This copy is iterated till page bitmap for all requested
> pfns are copied.
>
> Signed-off-by: Kirti Wankhede <kwankh...@nvidia.com>
> Reviewed-by: Neo Jia <c...@nvidia.com>
> ---
> hw/vfio/Makefile.objs | 2 +-
> hw/vfio/migration.c | 729
> ++++++++++++++++++++++++++++++++++++++++++
> include/hw/vfio/vfio-common.h | 23 ++
> 3 files changed, 753 insertions(+), 1 deletion(-) create mode 100644
> hw/vfio/migration.c
>
> diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs index
> a2e7a0a7cf02..2cf2ba1440f2 100644
> --- a/hw/vfio/Makefile.objs
> +++ b/hw/vfio/Makefile.objs
> @@ -1,5 +1,5 @@
> ifeq ($(CONFIG_LINUX), y)
> -obj-$(CONFIG_SOFTMMU) += common.o
> +obj-$(CONFIG_SOFTMMU) += common.o migration.o
> obj-$(CONFIG_PCI) += pci.o pci-quirks.o display.o
> obj-$(CONFIG_VFIO_CCW) += ccw.o
> obj-$(CONFIG_SOFTMMU) += platform.o
> diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c new file mode 100644
> index 000000000000..717fb63e4f43
> --- /dev/null
> +++ b/hw/vfio/migration.c
> @@ -0,0 +1,729 @@
> +/*
> + * Migration support for VFIO devices
> + *
> + * Copyright NVIDIA, Inc. 2018
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2. See
> + * the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include <linux/vfio.h>
> +
> +#include "hw/vfio/vfio-common.h"
> +#include "cpu.h"
> +#include "migration/migration.h"
> +#include "migration/qemu-file.h"
> +#include "migration/register.h"
> +#include "migration/blocker.h"
> +#include "migration/misc.h"
> +#include "qapi/error.h"
> +#include "exec/ramlist.h"
> +#include "exec/ram_addr.h"
> +#include "pci.h"
> +
> +/*
> + * Flags used as delimiter:
> + * 0xffffffff => MSB 32-bit all 1s
> + * 0xef10 => emulated (virtual) function IO
> + * 0x0000 => 16-bits reserved for flags
> + */
> +#define VFIO_MIG_FLAG_END_OF_STATE (0xffffffffef100001ULL)
> +#define VFIO_MIG_FLAG_DEV_CONFIG_STATE (0xffffffffef100002ULL)
> +#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL)
> +
> +static void vfio_migration_region_exit(VFIODevice *vbasedev) {
> + VFIOMigration *migration = vbasedev->migration;
> +
> + if (!migration) {
> + return;
> + }
> +
> + if (migration->region.buffer.size) {
> + vfio_region_exit(&migration->region.buffer);
> + vfio_region_finalize(&migration->region.buffer);
> + }
> +}
> +
> +static int vfio_migration_region_init(VFIODevice *vbasedev) {
> + VFIOMigration *migration = vbasedev->migration;
> + Object *obj = NULL;
> + int ret = -EINVAL;
> +
> + if (!migration) {
> + return ret;
> + }
> +
> + /* Migration support added for PCI device only */
> + if (vbasedev->type == VFIO_DEVICE_TYPE_PCI) {
> + obj = vfio_pci_get_object(vbasedev);
> + }
> +
> + if (!obj) {
> + return ret;
> + }
> +
> + ret = vfio_region_setup(obj, vbasedev, &migration->region.buffer,
> + migration->region.index, "migration");
> + if (ret) {
> + error_report("Failed to setup VFIO migration region %d: %s",
> + migration->region.index, strerror(-ret));
> + goto err;
> + }
> +
> + if (!migration->region.buffer.size) {
> + ret = -EINVAL;
> + error_report("Invalid region size of VFIO migration region %d: %s",
> + migration->region.index, strerror(-ret));
> + goto err;
> + }
> +
> + if (migration->region.buffer.mmaps) {
> + ret = vfio_region_mmap(&migration->region.buffer);
> + if (ret) {
> + error_report("Failed to mmap VFIO migration region %d: %s",
> + migration->region.index, strerror(-ret));
> + goto err;
> + }
> + }
> +
> + return 0;
> +
> +err:
> + vfio_migration_region_exit(vbasedev);
> + return ret;
> +}
> +
> +static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t
> +state) {
> + VFIOMigration *migration = vbasedev->migration;
> + VFIORegion *region = &migration->region.buffer;
> + int ret = 0;
> +
> + if (vbasedev->device_state == state) {
> + return ret;
> + }
> +
> + ret = pwrite(vbasedev->fd, &state, sizeof(state),
> + region->fd_offset + offsetof(struct
> vfio_device_migration_info,
> + device_state));
> + if (ret < 0) {
> + error_report("Failed to set migration state %d %s",
> + ret, strerror(errno));
> + return ret;
> + }
> +
> + vbasedev->device_state = state;
> + return ret;
> +}
> +
> +void vfio_get_dirty_page_list(VFIODevice *vbasedev,
> + uint64_t start_addr,
> + uint64_t pfn_count) {
> + VFIOMigration *migration = vbasedev->migration;
> + VFIORegion *region = &migration->region.buffer;
> + struct vfio_device_migration_info migration_info;
> + uint64_t count = 0;
> + int ret;
> +
> + migration_info.dirty_pfns.start_addr = start_addr;
> + migration_info.dirty_pfns.total = pfn_count;
> +
> + ret = pwrite(vbasedev->fd, &migration_info.dirty_pfns,
> + sizeof(migration_info.dirty_pfns),
> + region->fd_offset + offsetof(struct
> vfio_device_migration_info,
> + dirty_pfns));
> + if (ret < 0) {
> + error_report("Failed to set dirty pages start address %d %s",
> + ret, strerror(errno));
> + return;
> + }
> +
> + do {
> + /* Read dirty_pfns.copied */
> + ret = pread(vbasedev->fd, &migration_info.dirty_pfns,
> + sizeof(migration_info.dirty_pfns),
> + region->fd_offset + offsetof(struct
> vfio_device_migration_info,
> + dirty_pfns));
> + if (ret < 0) {
> + error_report("Failed to get dirty pages bitmap count %d %s",
> + ret, strerror(errno));
> + return;
> + }
> +
> + if (migration_info.dirty_pfns.copied) {
> + uint64_t bitmap_size;
> + void *buf = NULL;
> + bool buffer_mmaped = false;
> +
> + bitmap_size = (BITS_TO_LONGS(migration_info.dirty_pfns.copied) +
> 1)
> + * sizeof(unsigned long);
> +
> + if (region->mmaps) {
> + int i;
> +
> + for (i = 0; i < region->nr_mmaps; i++) {
> + if (region->mmaps[i].size >= bitmap_size) {
> + buf = region->mmaps[i].mmap;
> + buffer_mmaped = true;
> + break;
> + }
> + }
> + }
What if mmapped data area is in front of mmaped dirty bit area?
Maybe you need to record dirty bit region's index as what does for data region.
> +
> + if (!buffer_mmaped) {
> + buf = g_malloc0(bitmap_size);
> +
> + ret = pread(vbasedev->fd, buf, bitmap_size,
> + region->fd_offset + sizeof(migration_info) + 1);
> + if (ret != bitmap_size) {
> + error_report("Failed to get migration data %d", ret);
> + g_free(buf);
> + return;
> + }
> + }
> +
> + cpu_physical_memory_set_dirty_lebitmap((unsigned long *)buf,
> + start_addr + (count *
> TARGET_PAGE_SIZE),
> + migration_info.dirty_pfns.copied);
> + count += migration_info.dirty_pfns.copied;
> +
> + if (!buffer_mmaped) {
> + g_free(buf);
> + }
> + }
> + } while (count < migration_info.dirty_pfns.total); }
> +
> +static int vfio_save_device_config_state(QEMUFile *f, void *opaque) {
> + VFIODevice *vbasedev = opaque;
> +
> + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_CONFIG_STATE);
> +
> + if (vbasedev->type == VFIO_DEVICE_TYPE_PCI) {
> + vfio_pci_save_config(vbasedev, f);
> + }
> + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
> +
> + return qemu_file_get_error(f);
> +}
> +
> +static int vfio_load_device_config_state(QEMUFile *f, void *opaque) {
> + VFIODevice *vbasedev = opaque;
> +
> + if (vbasedev->type == VFIO_DEVICE_TYPE_PCI) {
> + vfio_pci_load_config(vbasedev, f);
> + }
> +
> + if (qemu_get_be64(f) != VFIO_MIG_FLAG_END_OF_STATE) {
> + error_report("Wrong end of block while loading device config space");
> + return -EINVAL;
> + }
> +
> + return qemu_file_get_error(f);
> +}
> +
What's the purpose to add a tailing VFIO_MIG_FLAG_END_OF_STATE for each
section?
For compatibility check?
Maybe a version id or magic in struct vfio_device_migration_info is more
appropriate?
> +/*
> +----------------------------------------------------------------------
> +*/
> +
> +static bool vfio_is_active_iterate(void *opaque) {
> + VFIODevice *vbasedev = opaque;
> +
> + if (vbasedev->vm_running && vbasedev->migration &&
> + (vbasedev->migration->pending_precopy_only != 0))
> + return true;
> +
> + if (!vbasedev->vm_running && vbasedev->migration &&
> + (vbasedev->migration->pending_postcopy != 0))
> + return true;
> +
> + return false;
> +}
> +
> +static int vfio_save_setup(QEMUFile *f, void *opaque) {
> + VFIODevice *vbasedev = opaque;
> + int ret;
> +
> + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE);
> +
> + qemu_mutex_lock_iothread();
> + ret = vfio_migration_region_init(vbasedev);
> + qemu_mutex_unlock_iothread();
> + if (ret) {
> + return ret;
> + }
> +
> + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
> +
> + ret = qemu_file_get_error(f);
> + if (ret) {
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev) {
> + VFIOMigration *migration = vbasedev->migration;
> + VFIORegion *region = &migration->region.buffer;
> + struct vfio_device_migration_info migration_info;
> + int ret;
> +
> + ret = pread(vbasedev->fd, &migration_info.data,
> + sizeof(migration_info.data),
> + region->fd_offset + offsetof(struct
> vfio_device_migration_info,
> + data));
> + if (ret != sizeof(migration_info.data)) {
> + error_report("Failed to get migration buffer information %d",
> + ret);
> + return -EINVAL;
> + }
> +
> + if (migration_info.data.size) {
> + void *buf = NULL;
> + bool buffer_mmaped = false;
> +
> + if (region->mmaps) {
> + int i;
> +
> + for (i = 0; i < region->nr_mmaps; i++) {
> + if (region->mmaps[i].offset == migration_info.data.offset) {
> + buf = region->mmaps[i].mmap;
> + buffer_mmaped = true;
> + break;
> + }
> + }
> + }
> +
> + if (!buffer_mmaped) {
> + buf = g_malloc0(migration_info.data.size);
> + ret = pread(vbasedev->fd, buf, migration_info.data.size,
> + region->fd_offset + migration_info.data.offset);
> + if (ret != migration_info.data.size) {
> + error_report("Failed to get migration data %d", ret);
> + return -EINVAL;
> + }
> + }
> +
> + qemu_put_be64(f, migration_info.data.size);
> + qemu_put_buffer(f, buf, migration_info.data.size);
> +
> + if (!buffer_mmaped) {
> + g_free(buf);
> + }
> +
> + } else {
> + qemu_put_be64(f, migration_info.data.size);
> + }
> +
> + ret = qemu_file_get_error(f);
> + if (ret) {
> + return ret;
> + }
> +
> + return migration_info.data.size;
> +}
> +
> +static int vfio_save_iterate(QEMUFile *f, void *opaque) {
> + VFIODevice *vbasedev = opaque;
> + int ret;
> +
> + ret = vfio_save_buffer(f, vbasedev);
> + if (ret < 0) {
> + error_report("vfio_save_buffer failed %s",
> + strerror(errno));
> + return ret;
> + }
> +
> + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
> +
> + ret = qemu_file_get_error(f);
> + if (ret) {
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static void vfio_update_pending(VFIODevice *vbasedev, uint64_t
> +threshold_size) {
> + VFIOMigration *migration = vbasedev->migration;
> + VFIORegion *region = &migration->region.buffer;
> + struct vfio_device_migration_info migration_info;
> + int ret;
> +
> + ret = pwrite(vbasedev->fd, &threshold_size, sizeof(threshold_size),
> + region->fd_offset + offsetof(struct
> vfio_device_migration_info,
> + pending.threshold_size));
> + if (ret < 0) {
> + error_report("Failed to set threshold size %d %s",
> + ret, strerror(errno));
> + return;
> + }
> +
> + ret = pread(vbasedev->fd, &migration_info.pending,
> + sizeof(migration_info.pending),
> + region->fd_offset + offsetof(struct
> vfio_device_migration_info,
> + pending));
> + if (ret != sizeof(migration_info.pending)) {
> + error_report("Failed to get pending bytes %d", ret);
> + return;
> + }
> +
> + migration->pending_precopy_only = migration_info.pending.precopy_only;
> + migration->pending_compatible = migration_info.pending.compatible;
> + migration->pending_postcopy = migration_info.pending.postcopy_only;
> +
> + return;
> +}
> +
> +static void vfio_save_pending(QEMUFile *f, void *opaque,
> + uint64_t threshold_size,
> + uint64_t *res_precopy_only,
> + uint64_t *res_compatible,
> + uint64_t *res_postcopy_only) {
> + VFIODevice *vbasedev = opaque;
> + VFIOMigration *migration = vbasedev->migration;
> +
> + vfio_update_pending(vbasedev, threshold_size);
> +
> + *res_precopy_only += migration->pending_precopy_only;
> + *res_compatible += migration->pending_compatible;
> + *res_postcopy_only += migration->pending_postcopy; }
> +
> +static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) {
> + VFIODevice *vbasedev = opaque;
> + VFIOMigration *migration = vbasedev->migration;
> + MigrationState *ms = migrate_get_current();
> + int ret;
> +
> + if (vbasedev->vm_running) {
> + vbasedev->vm_running = 0;
> + }
> +
> + ret = vfio_migration_set_state(vbasedev,
> + VFIO_DEVICE_STATE_MIGRATION_STOPNCOPY);
> + if (ret) {
> + error_report("Failed to set state STOPNCOPY_ACTIVE");
> + return ret;
> + }
> +
> + ret = vfio_save_device_config_state(f, opaque);
> + if (ret) {
> + return ret;
> + }
> +
> + do {
> + vfio_update_pending(vbasedev, ms->threshold_size);
> +
> + if (vfio_is_active_iterate(opaque)) {
> + ret = vfio_save_buffer(f, vbasedev);
> + if (ret < 0) {
> + error_report("Failed to save buffer");
> + break;
> + } else if (ret == 0) {
> + break;
> + }
> + }
> + } while ((migration->pending_compatible +
> + migration->pending_postcopy) > 0);
> +
if migration->pending_postcopy is not 0, vfio_save_complete_precopy() cannot
finish? Is that true?
But vfio_save_complete_precopy() does not need to copy post copy data.
> + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
> +
> + ret = qemu_file_get_error(f);
> + if (ret) {
> + return ret;
> + }
> +
> + ret = vfio_migration_set_state(vbasedev,
> +
> VFIO_DEVICE_STATE_MIGRATION_SAVE_COMPLETED);
> + if (ret) {
> + error_report("Failed to set state SAVE_COMPLETED");
> + return ret;
> + }
> + return ret;
> +}
> +
> +static void vfio_save_cleanup(void *opaque) {
> + VFIODevice *vbasedev = opaque;
> +
> + vfio_migration_region_exit(vbasedev);
> +}
> +
> +static int vfio_load_state(QEMUFile *f, void *opaque, int version_id) {
> + VFIODevice *vbasedev = opaque;
> + int ret;
> + uint64_t data;
> +
Need to use version_id to check source and target version.
> + data = qemu_get_be64(f);
> + while (data != VFIO_MIG_FLAG_END_OF_STATE) {
> + if (data == VFIO_MIG_FLAG_DEV_CONFIG_STATE) {
> + ret = vfio_load_device_config_state(f, opaque);
> + if (ret) {
> + return ret;
> + }
> + } else if (data == VFIO_MIG_FLAG_DEV_SETUP_STATE) {
> + data = qemu_get_be64(f);
> + if (data == VFIO_MIG_FLAG_END_OF_STATE) {
> + return 0;
> + } else {
> + error_report("SETUP STATE: EOS not found 0x%lx", data);
> + return -EINVAL;
> + }
> + } else if (data != 0) {
> + VFIOMigration *migration = vbasedev->migration;
> + VFIORegion *region = &migration->region.buffer;
> + struct vfio_device_migration_info migration_info;
> + void *buf = NULL;
> + bool buffer_mmaped = false;
> +
> + migration_info.data.size = data;
> +
> + if (region->mmaps) {
> + int i;
> +
> + for (i = 0; i < region->nr_mmaps; i++) {
> + if (region->mmaps[i].mmap &&
> + (region->mmaps[i].size >= data)) {
> + buf = region->mmaps[i].mmap;
> + migration_info.data.offset = region->mmaps[i].offset;
> + buffer_mmaped = true;
> + break;
> + }
> + }
> + }
> +
> + if (!buffer_mmaped) {
> + buf = g_malloc0(migration_info.data.size);
> + migration_info.data.offset = sizeof(migration_info) + 1;
> + }
> +
> + qemu_get_buffer(f, buf, data);
> +
> + ret = pwrite(vbasedev->fd, &migration_info.data,
> + sizeof(migration_info.data),
> + region->fd_offset +
> + offsetof(struct vfio_device_migration_info, data));
> + if (ret != sizeof(migration_info.data)) {
> + error_report("Failed to set migration buffer information %d",
> + ret);
> + return -EINVAL;
> + }
> +
> + if (!buffer_mmaped) {
> + ret = pwrite(vbasedev->fd, buf, migration_info.data.size,
> + region->fd_offset + migration_info.data.offset);
> + g_free(buf);
> +
> + if (ret != migration_info.data.size) {
> + error_report("Failed to set migration buffer %d", ret);
> + return -EINVAL;
> + }
> + }
> + }
> +
> + ret = qemu_file_get_error(f);
> + if (ret) {
> + return ret;
> + }
> + data = qemu_get_be64(f);
> + }
> +
> + return 0;
> +}
> +
> +static int vfio_load_setup(QEMUFile *f, void *opaque) {
> + VFIODevice *vbasedev = opaque;
> + int ret;
> +
> + ret = vfio_migration_set_state(vbasedev,
> + VFIO_DEVICE_STATE_MIGRATION_RESUME);
> + if (ret) {
> + error_report("Failed to set state RESUME");
> + }
> +
> + ret = vfio_migration_region_init(vbasedev);
> + if (ret) {
> + error_report("Failed to initialise migration region");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
Why vfio_migration_set_state() is in front of vfio_migration_region_init()?
So VFIO_DEVICE_STATE_MIGRATION_RESUME is really useful? :)
> +static int vfio_load_cleanup(void *opaque) {
> + VFIODevice *vbasedev = opaque;
> + int ret = 0;
> +
> + ret = vfio_migration_set_state(vbasedev,
> +
> VFIO_DEVICE_STATE_MIGRATION_RESUME_COMPLETED);
> + if (ret) {
> + error_report("Failed to set state RESUME_COMPLETED");
> + }
> +
> + vfio_migration_region_exit(vbasedev);
> + return ret;
> +}
> +
> +static SaveVMHandlers savevm_vfio_handlers = {
> + .save_setup = vfio_save_setup,
> + .save_live_iterate = vfio_save_iterate,
> + .save_live_complete_precopy = vfio_save_complete_precopy,
> + .save_live_pending = vfio_save_pending,
> + .save_cleanup = vfio_save_cleanup,
> + .load_state = vfio_load_state,
> + .load_setup = vfio_load_setup,
> + .load_cleanup = vfio_load_cleanup,
> + .is_active_iterate = vfio_is_active_iterate, };
> +
> +static void vfio_vmstate_change(void *opaque, int running, RunState
> +state) {
> + VFIODevice *vbasedev = opaque;
> +
> + if ((vbasedev->vm_running != running) && running) {
> + int ret;
> +
> + ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RUNNING);
> + if (ret) {
> + error_report("Failed to set state RUNNING");
> + }
> + }
> +
> + vbasedev->vm_running = running;
> +}
> +
vfio_vmstate_change() is registered at initialization, so for source vm
vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RUNNING) will be called on
vm start.
but vfio_migration_region_init() is called in save_setup() when migration
starts,
as a result, "vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RUNNING)"
should not function here for source vm.
So, again, is this state really used? :)
> +static void vfio_migration_state_notifier(Notifier *notifier, void
> +*data) {
> + MigrationState *s = data;
> + VFIODevice *vbasedev = container_of(notifier, VFIODevice,
> migration_state);
> + int ret;
> +
> + switch (s->state) {
> + case MIGRATION_STATUS_SETUP:
> + ret = vfio_migration_set_state(vbasedev,
> + VFIO_DEVICE_STATE_MIGRATION_SETUP);
> + if (ret) {
> + error_report("Failed to set state SETUP");
> + }
> + return;
> +
> + case MIGRATION_STATUS_ACTIVE:
> + if (vbasedev->device_state == VFIO_DEVICE_STATE_MIGRATION_SETUP) {
> + if (vbasedev->vm_running) {
> + ret = vfio_migration_set_state(vbasedev,
> +
> VFIO_DEVICE_STATE_MIGRATION_PRECOPY);
> + if (ret) {
> + error_report("Failed to set state PRECOPY_ACTIVE");
> + }
> + } else {
> + ret = vfio_migration_set_state(vbasedev,
> +
> VFIO_DEVICE_STATE_MIGRATION_STOPNCOPY);
> + if (ret) {
> + error_report("Failed to set state STOPNCOPY_ACTIVE");
> + }
> + }
> + } else {
> + ret = vfio_migration_set_state(vbasedev,
> +
> VFIO_DEVICE_STATE_MIGRATION_RESUME);
> + if (ret) {
> + error_report("Failed to set state RESUME");
> + }
> + }
> + return;
> +
> + case MIGRATION_STATUS_CANCELLING:
> + case MIGRATION_STATUS_CANCELLED:
> + ret = vfio_migration_set_state(vbasedev,
> +
> VFIO_DEVICE_STATE_MIGRATION_CANCELLED);
> + if (ret) {
> + error_report("Failed to set state CANCELLED");
> + }
> + return;
> +
> + case MIGRATION_STATUS_FAILED:
> + ret = vfio_migration_set_state(vbasedev,
> + VFIO_DEVICE_STATE_MIGRATION_FAILED);
> + if (ret) {
> + error_report("Failed to set state FAILED");
> + }
> + return;
> + }
> +}
> +
> +static int vfio_migration_init(VFIODevice *vbasedev,
> + struct vfio_region_info *info) {
> + vbasedev->migration = g_new0(VFIOMigration, 1);
> + vbasedev->migration->region.index = info->index;
> +
> + register_savevm_live(NULL, "vfio", -1, 1, &savevm_vfio_handlers,
> vbasedev);
> + vbasedev->vm_state =
> qemu_add_vm_change_state_handler(vfio_vmstate_change,
> + vbasedev);
> +
> + vbasedev->migration_state.notify = vfio_migration_state_notifier;
> + add_migration_state_change_notifier(&vbasedev->migration_state);
> +
> + return 0;
> +}
> +
> +
> +/*
> +----------------------------------------------------------------------
> +*/
> +
> +int vfio_migration_probe(VFIODevice *vbasedev, Error **errp) {
> + struct vfio_region_info *info;
> + int ret;
> +
> + ret = vfio_get_dev_region_info(vbasedev, VFIO_REGION_TYPE_MIGRATION,
> + VFIO_REGION_SUBTYPE_MIGRATION, &info);
> + if (ret) {
> + Error *local_err = NULL;
> +
> + error_setg(&vbasedev->migration_blocker,
> + "VFIO device doesn't support migration");
> + ret = migrate_add_blocker(vbasedev->migration_blocker, &local_err);
> + if (local_err) {
> + error_propagate(errp, local_err);
> + error_free(vbasedev->migration_blocker);
> + return ret;
> + }
> + } else {
> + return vfio_migration_init(vbasedev, info);
> + }
> +
> + return 0;
> +}
> +
> +void vfio_migration_finalize(VFIODevice *vbasedev) {
> + if (!vbasedev->migration) {
> + return;
> + }
> +
> + if (vbasedev->vm_state) {
> + qemu_del_vm_change_state_handler(vbasedev->vm_state);
> + remove_migration_state_change_notifier(&vbasedev->migration_state);
> + }
> +
> + if (vbasedev->migration_blocker) {
> + migrate_del_blocker(vbasedev->migration_blocker);
> + error_free(vbasedev->migration_blocker);
> + }
> +
> + g_free(vbasedev->migration);
> +}
> diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
> index a9036929b220..ab8217c9e249 100644
> --- a/include/hw/vfio/vfio-common.h
> +++ b/include/hw/vfio/vfio-common.h
> @@ -30,6 +30,8 @@
> #include <linux/vfio.h>
> #endif
>
> +#include "sysemu/sysemu.h"
> +
> #define ERR_PREFIX "vfio error: %s: "
> #define WARN_PREFIX "vfio warning: %s: "
>
> @@ -57,6 +59,16 @@ typedef struct VFIORegion {
> uint8_t nr; /* cache the region number for debug */ } VFIORegion;
>
> +typedef struct VFIOMigration {
> + struct {
> + VFIORegion buffer;
> + uint32_t index;
> + } region;
> + uint64_t pending_precopy_only;
> + uint64_t pending_compatible;
> + uint64_t pending_postcopy;
> +} VFIOMigration;
> +
> typedef struct VFIOAddressSpace {
> AddressSpace *as;
> QLIST_HEAD(, VFIOContainer) containers; @@ -116,6 +128,12 @@ typedef
> struct VFIODevice {
> unsigned int num_irqs;
> unsigned int num_regions;
> unsigned int flags;
> + uint32_t device_state;
> + VMChangeStateEntry *vm_state;
> + int vm_running;
> + Notifier migration_state;
> + VFIOMigration *migration;
> + Error *migration_blocker;
> } VFIODevice;
>
> struct VFIODeviceOps {
> @@ -193,4 +211,9 @@ int vfio_spapr_create_window(VFIOContainer
> *container, int vfio_spapr_remove_window(VFIOContainer *container,
> hwaddr offset_within_address_space);
>
> +int vfio_migration_probe(VFIODevice *vbasedev, Error **errp); void
> +vfio_migration_finalize(VFIODevice *vbasedev); void
> +vfio_get_dirty_page_list(VFIODevice *vbasedev, uint64_t start_addr,
> + uint64_t pfn_count);
> +
> #endif /* HW_VFIO_VFIO_COMMON_H */
> --
> 2.7.0
>
