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[Qemu-devel] [PATCH v4 09/13] vfio: Add load state functions to SaveVMHa
From: |
Kirti Wankhede |
Subject: |
[Qemu-devel] [PATCH v4 09/13] vfio: Add load state functions to SaveVMHandlers |
Date: |
Thu, 20 Jun 2019 20:07:37 +0530 |
During _RESUMING device state:
- If Vendor driver defines mappable region, mmap migration region.
- Load config state.
- For data packet, till VFIO_MIG_FLAG_END_OF_STATE is not reached
- read data_size from packet, read buffer of data_size
- read data_offset from where QEMU should write data.
if region is mmaped, write data of data_size to mmaped region.
- write data_size.
In case of mmapped region, write to data_size indicates kernel
driver that data is written in staging buffer.
- if region is trapped, pwrite() data of data_size from data_offset.
- Repeat above until VFIO_MIG_FLAG_END_OF_STATE.
- Unmap migration region.
Signed-off-by: Kirti Wankhede <address@hidden>
Reviewed-by: Neo Jia <address@hidden>
---
hw/vfio/migration.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 153 insertions(+)
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 0a2f30872316..e4895f91761d 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -212,6 +212,22 @@ static int vfio_save_device_config_state(QEMUFile *f, void
*opaque)
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);
+}
+
/* ---------------------------------------------------------------------- */
static int vfio_save_setup(QEMUFile *f, void *opaque)
@@ -372,12 +388,149 @@ static int vfio_save_complete_precopy(QEMUFile *f, void
*opaque)
return ret;
}
+static int vfio_load_setup(QEMUFile *f, void *opaque)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ int ret = 0;
+
+ 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));
+ return ret;
+ }
+ }
+
+ ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING);
+ if (ret) {
+ error_report("Failed to set state RESUMING");
+ }
+ return ret;
+}
+
+static int vfio_load_cleanup(void *opaque)
+{
+ vfio_save_cleanup(opaque);
+ return 0;
+}
+
+static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ int ret = 0;
+ uint64_t data, data_size;
+
+ data = qemu_get_be64(f);
+ while (data != VFIO_MIG_FLAG_END_OF_STATE) {
+ switch (data) {
+ case VFIO_MIG_FLAG_DEV_CONFIG_STATE:
+ {
+ ret = vfio_load_device_config_state(f, opaque);
+ if (ret) {
+ return ret;
+ }
+ break;
+ }
+ case VFIO_MIG_FLAG_DEV_SETUP_STATE:
+ {
+ data = qemu_get_be64(f);
+ if (data == VFIO_MIG_FLAG_END_OF_STATE) {
+ return ret;
+ } else {
+ error_report("SETUP STATE: EOS not found 0x%lx", data);
+ return -EINVAL;
+ }
+ break;
+ }
+ case VFIO_MIG_FLAG_DEV_DATA_STATE:
+ {
+ VFIORegion *region = &migration->region.buffer;
+ void *buf = NULL;
+ bool buffer_mmaped = false;
+ uint64_t data_offset = 0;
+
+ data_size = qemu_get_be64(f);
+ if (data_size == 0) {
+ break;
+ }
+
+ ret = pread(vbasedev->fd, &data_offset, sizeof(data_offset),
+ region->fd_offset +
+ offsetof(struct vfio_device_migration_info,
+ data_offset));
+ if (ret != sizeof(data_offset)) {
+ error_report("Failed to get migration buffer data offset %d",
+ ret);
+ return -EINVAL;
+ }
+
+ if (region->mmaps) {
+ int i;
+
+ for (i = 0; i < region->nr_mmaps; i++) {
+ if (region->mmaps[i].mmap &&
+ (data_offset >= region->mmaps[i].offset) &&
+ (data_offset < region->mmaps[i].offset +
+ region->mmaps[i].size)) {
+ buf = region->mmaps[i].mmap + (data_offset -
+ region->mmaps[i].offset);
+ buffer_mmaped = true;
+ break;
+ }
+ }
+ }
+
+ if (!buffer_mmaped) {
+ buf = g_malloc0(data_size);
+ }
+
+ qemu_get_buffer(f, buf, data_size);
+
+ ret = pwrite(vbasedev->fd, &data_size, sizeof(data_size),
+ region->fd_offset +
+ offsetof(struct vfio_device_migration_info, data_size));
+ if (ret != sizeof(data_size)) {
+ error_report("Failed to set migration buffer data size %d",
+ ret);
+ return -EINVAL;
+ }
+
+ if (!buffer_mmaped) {
+ ret = pwrite(vbasedev->fd, buf, data_size,
+ region->fd_offset + data_offset);
+ g_free(buf);
+
+ if (ret != data_size) {
+ error_report("Failed to set migration buffer %d", ret);
+ return -EINVAL;
+ }
+ }
+ break;
+ }
+ }
+
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ return ret;
+ }
+ data = qemu_get_be64(f);
+ }
+
+ return ret;
+}
+
static SaveVMHandlers savevm_vfio_handlers = {
.save_setup = vfio_save_setup,
.save_cleanup = vfio_save_cleanup,
.save_live_pending = vfio_save_pending,
.save_live_iterate = vfio_save_iterate,
.save_live_complete_precopy = vfio_save_complete_precopy,
+ .load_setup = vfio_load_setup,
+ .load_cleanup = vfio_load_cleanup,
+ .load_state = vfio_load_state,
};
/* ---------------------------------------------------------------------- */
--
2.7.0
- Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, (continued)
- Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Alex Williamson, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Kirti Wankhede, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Alex Williamson, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Kirti Wankhede, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Alex Williamson, 2019/06/21
- Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Kirti Wankhede, 2019/06/24
Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Yan Zhao, 2019/06/20
Re: [Qemu-devel] [PATCH v4 08/13] vfio: Add save state functions to SaveVMHandlers, Dr. David Alan Gilbert, 2019/06/28
[Qemu-devel] [PATCH v4 09/13] vfio: Add load state functions to SaveVMHandlers,
Kirti Wankhede <=
[Qemu-devel] [PATCH v4 10/13] vfio: Add function to get dirty page list, Kirti Wankhede, 2019/06/20
[Qemu-devel] [PATCH v4 11/13] vfio: Add vfio_listerner_log_sync to mark dirty pages, Kirti Wankhede, 2019/06/20
[Qemu-devel] [PATCH v4 12/13] vfio: Make vfio-pci device migration capable., Kirti Wankhede, 2019/06/20
[Qemu-devel] [PATCH v4 13/13] vfio: Add trace events in migration code path, Kirti Wankhede, 2019/06/20
Re: [Qemu-devel] [PATCH v4 00/13] Add migration support for VFIO device, Yan Zhao, 2019/06/20