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917 lines
26 KiB
C
917 lines
26 KiB
C
/*
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* Migration support for VFIO devices
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*
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* Copyright NVIDIA, Inc. 2020
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/main-loop.h"
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#include "qemu/cutils.h"
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#include <linux/vfio.h>
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#include <sys/ioctl.h>
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#include "sysemu/runstate.h"
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#include "hw/vfio/vfio-common.h"
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#include "migration/migration.h"
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#include "migration/vmstate.h"
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#include "migration/qemu-file.h"
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#include "migration/register.h"
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#include "migration/blocker.h"
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#include "migration/misc.h"
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#include "qapi/error.h"
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#include "exec/ramlist.h"
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#include "exec/ram_addr.h"
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#include "pci.h"
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#include "trace.h"
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#include "hw/hw.h"
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/*
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* Flags to be used as unique delimiters for VFIO devices in the migration
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* stream. These flags are composed as:
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* 0xffffffff => MSB 32-bit all 1s
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* 0xef10 => Magic ID, represents emulated (virtual) function IO
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* 0x0000 => 16-bits reserved for flags
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*
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* The beginning of state information is marked by _DEV_CONFIG_STATE,
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* _DEV_SETUP_STATE, or _DEV_DATA_STATE, respectively. The end of a
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* certain state information is marked by _END_OF_STATE.
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*/
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#define VFIO_MIG_FLAG_END_OF_STATE (0xffffffffef100001ULL)
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#define VFIO_MIG_FLAG_DEV_CONFIG_STATE (0xffffffffef100002ULL)
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#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL)
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#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL)
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static int64_t bytes_transferred;
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static inline int vfio_mig_access(VFIODevice *vbasedev, void *val, int count,
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off_t off, bool iswrite)
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{
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int ret;
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ret = iswrite ? pwrite(vbasedev->fd, val, count, off) :
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pread(vbasedev->fd, val, count, off);
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if (ret < count) {
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error_report("vfio_mig_%s %d byte %s: failed at offset 0x%"
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HWADDR_PRIx", err: %s", iswrite ? "write" : "read", count,
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vbasedev->name, off, strerror(errno));
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return (ret < 0) ? ret : -EINVAL;
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}
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return 0;
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}
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static int vfio_mig_rw(VFIODevice *vbasedev, __u8 *buf, size_t count,
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off_t off, bool iswrite)
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{
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int ret, done = 0;
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__u8 *tbuf = buf;
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while (count) {
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int bytes = 0;
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if (count >= 8 && !(off % 8)) {
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bytes = 8;
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} else if (count >= 4 && !(off % 4)) {
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bytes = 4;
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} else if (count >= 2 && !(off % 2)) {
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bytes = 2;
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} else {
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bytes = 1;
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}
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ret = vfio_mig_access(vbasedev, tbuf, bytes, off, iswrite);
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if (ret) {
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return ret;
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}
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count -= bytes;
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done += bytes;
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off += bytes;
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tbuf += bytes;
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}
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return done;
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}
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#define vfio_mig_read(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, false)
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#define vfio_mig_write(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, true)
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#define VFIO_MIG_STRUCT_OFFSET(f) \
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offsetof(struct vfio_device_migration_info, f)
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/*
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* Change the device_state register for device @vbasedev. Bits set in @mask
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* are preserved, bits set in @value are set, and bits not set in either @mask
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* or @value are cleared in device_state. If the register cannot be accessed,
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* the resulting state would be invalid, or the device enters an error state,
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* an error is returned.
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*/
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static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t mask,
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uint32_t value)
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{
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VFIOMigration *migration = vbasedev->migration;
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VFIORegion *region = &migration->region;
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off_t dev_state_off = region->fd_offset +
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VFIO_MIG_STRUCT_OFFSET(device_state);
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uint32_t device_state;
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int ret;
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ret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
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dev_state_off);
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if (ret < 0) {
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return ret;
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}
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device_state = (device_state & mask) | value;
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if (!VFIO_DEVICE_STATE_VALID(device_state)) {
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return -EINVAL;
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}
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ret = vfio_mig_write(vbasedev, &device_state, sizeof(device_state),
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dev_state_off);
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if (ret < 0) {
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int rret;
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rret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
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dev_state_off);
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if ((rret < 0) || (VFIO_DEVICE_STATE_IS_ERROR(device_state))) {
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hw_error("%s: Device in error state 0x%x", vbasedev->name,
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device_state);
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return rret ? rret : -EIO;
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}
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return ret;
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}
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migration->device_state = device_state;
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trace_vfio_migration_set_state(vbasedev->name, device_state);
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return 0;
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}
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static void *get_data_section_size(VFIORegion *region, uint64_t data_offset,
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uint64_t data_size, uint64_t *size)
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{
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void *ptr = NULL;
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uint64_t limit = 0;
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int i;
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if (!region->mmaps) {
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if (size) {
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*size = MIN(data_size, region->size - data_offset);
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}
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return ptr;
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}
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for (i = 0; i < region->nr_mmaps; i++) {
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VFIOMmap *map = region->mmaps + i;
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if ((data_offset >= map->offset) &&
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(data_offset < map->offset + map->size)) {
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/* check if data_offset is within sparse mmap areas */
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ptr = map->mmap + data_offset - map->offset;
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if (size) {
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*size = MIN(data_size, map->offset + map->size - data_offset);
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}
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break;
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} else if ((data_offset < map->offset) &&
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(!limit || limit > map->offset)) {
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/*
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* data_offset is not within sparse mmap areas, find size of
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* non-mapped area. Check through all list since region->mmaps list
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* is not sorted.
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*/
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limit = map->offset;
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}
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}
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if (!ptr && size) {
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*size = limit ? MIN(data_size, limit - data_offset) : data_size;
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}
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return ptr;
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}
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static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev, uint64_t *size)
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{
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VFIOMigration *migration = vbasedev->migration;
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VFIORegion *region = &migration->region;
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uint64_t data_offset = 0, data_size = 0, sz;
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int ret;
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ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset),
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region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset));
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if (ret < 0) {
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return ret;
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}
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ret = vfio_mig_read(vbasedev, &data_size, sizeof(data_size),
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region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size));
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if (ret < 0) {
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return ret;
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}
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trace_vfio_save_buffer(vbasedev->name, data_offset, data_size,
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migration->pending_bytes);
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qemu_put_be64(f, data_size);
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sz = data_size;
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while (sz) {
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void *buf;
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uint64_t sec_size;
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bool buf_allocated = false;
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buf = get_data_section_size(region, data_offset, sz, &sec_size);
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if (!buf) {
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buf = g_try_malloc(sec_size);
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if (!buf) {
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error_report("%s: Error allocating buffer ", __func__);
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return -ENOMEM;
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}
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buf_allocated = true;
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ret = vfio_mig_read(vbasedev, buf, sec_size,
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region->fd_offset + data_offset);
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if (ret < 0) {
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g_free(buf);
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return ret;
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}
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}
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qemu_put_buffer(f, buf, sec_size);
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if (buf_allocated) {
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g_free(buf);
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}
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sz -= sec_size;
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data_offset += sec_size;
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}
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ret = qemu_file_get_error(f);
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if (!ret && size) {
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*size = data_size;
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}
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bytes_transferred += data_size;
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return ret;
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}
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static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev,
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uint64_t data_size)
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{
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VFIORegion *region = &vbasedev->migration->region;
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uint64_t data_offset = 0, size, report_size;
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int ret;
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do {
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ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset),
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region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset));
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if (ret < 0) {
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return ret;
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}
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if (data_offset + data_size > region->size) {
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/*
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* If data_size is greater than the data section of migration region
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* then iterate the write buffer operation. This case can occur if
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* size of migration region at destination is smaller than size of
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* migration region at source.
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*/
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report_size = size = region->size - data_offset;
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data_size -= size;
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} else {
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report_size = size = data_size;
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data_size = 0;
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}
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trace_vfio_load_state_device_data(vbasedev->name, data_offset, size);
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while (size) {
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void *buf;
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uint64_t sec_size;
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bool buf_alloc = false;
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buf = get_data_section_size(region, data_offset, size, &sec_size);
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if (!buf) {
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buf = g_try_malloc(sec_size);
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if (!buf) {
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error_report("%s: Error allocating buffer ", __func__);
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return -ENOMEM;
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}
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buf_alloc = true;
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}
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qemu_get_buffer(f, buf, sec_size);
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if (buf_alloc) {
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ret = vfio_mig_write(vbasedev, buf, sec_size,
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region->fd_offset + data_offset);
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g_free(buf);
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if (ret < 0) {
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return ret;
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}
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}
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size -= sec_size;
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data_offset += sec_size;
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}
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ret = vfio_mig_write(vbasedev, &report_size, sizeof(report_size),
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region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size));
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if (ret < 0) {
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return ret;
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}
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} while (data_size);
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return 0;
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}
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static int vfio_update_pending(VFIODevice *vbasedev)
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{
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VFIOMigration *migration = vbasedev->migration;
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VFIORegion *region = &migration->region;
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uint64_t pending_bytes = 0;
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int ret;
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ret = vfio_mig_read(vbasedev, &pending_bytes, sizeof(pending_bytes),
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region->fd_offset + VFIO_MIG_STRUCT_OFFSET(pending_bytes));
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if (ret < 0) {
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migration->pending_bytes = 0;
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return ret;
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}
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migration->pending_bytes = pending_bytes;
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trace_vfio_update_pending(vbasedev->name, pending_bytes);
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return 0;
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}
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static int vfio_save_device_config_state(QEMUFile *f, void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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qemu_put_be64(f, VFIO_MIG_FLAG_DEV_CONFIG_STATE);
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if (vbasedev->ops && vbasedev->ops->vfio_save_config) {
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vbasedev->ops->vfio_save_config(vbasedev, f);
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}
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qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
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trace_vfio_save_device_config_state(vbasedev->name);
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return qemu_file_get_error(f);
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}
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static int vfio_load_device_config_state(QEMUFile *f, void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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uint64_t data;
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if (vbasedev->ops && vbasedev->ops->vfio_load_config) {
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int ret;
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ret = vbasedev->ops->vfio_load_config(vbasedev, f);
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if (ret) {
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error_report("%s: Failed to load device config space",
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vbasedev->name);
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return ret;
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}
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}
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data = qemu_get_be64(f);
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if (data != VFIO_MIG_FLAG_END_OF_STATE) {
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error_report("%s: Failed loading device config space, "
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"end flag incorrect 0x%"PRIx64, vbasedev->name, data);
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return -EINVAL;
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}
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trace_vfio_load_device_config_state(vbasedev->name);
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return qemu_file_get_error(f);
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}
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static void vfio_migration_cleanup(VFIODevice *vbasedev)
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{
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VFIOMigration *migration = vbasedev->migration;
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if (migration->region.mmaps) {
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vfio_region_unmap(&migration->region);
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}
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}
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/* ---------------------------------------------------------------------- */
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static int vfio_save_setup(QEMUFile *f, void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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VFIOMigration *migration = vbasedev->migration;
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int ret;
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trace_vfio_save_setup(vbasedev->name);
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qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE);
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if (migration->region.mmaps) {
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/*
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* Calling vfio_region_mmap() from migration thread. Memory API called
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* from this function require locking the iothread when called from
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* outside the main loop thread.
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*/
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qemu_mutex_lock_iothread();
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ret = vfio_region_mmap(&migration->region);
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qemu_mutex_unlock_iothread();
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if (ret) {
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error_report("%s: Failed to mmap VFIO migration region: %s",
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vbasedev->name, strerror(-ret));
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error_report("%s: Falling back to slow path", vbasedev->name);
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}
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}
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ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_MASK,
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VFIO_DEVICE_STATE_V1_SAVING);
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if (ret) {
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error_report("%s: Failed to set state SAVING", vbasedev->name);
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return ret;
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}
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qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
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ret = qemu_file_get_error(f);
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if (ret) {
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return ret;
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}
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return 0;
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}
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static void vfio_save_cleanup(void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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vfio_migration_cleanup(vbasedev);
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trace_vfio_save_cleanup(vbasedev->name);
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}
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static void vfio_save_pending(QEMUFile *f, void *opaque,
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uint64_t threshold_size,
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uint64_t *res_precopy_only,
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uint64_t *res_compatible,
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uint64_t *res_postcopy_only)
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{
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VFIODevice *vbasedev = opaque;
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VFIOMigration *migration = vbasedev->migration;
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int ret;
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ret = vfio_update_pending(vbasedev);
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if (ret) {
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return;
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}
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*res_precopy_only += migration->pending_bytes;
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trace_vfio_save_pending(vbasedev->name, *res_precopy_only,
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*res_postcopy_only, *res_compatible);
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}
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static int vfio_save_iterate(QEMUFile *f, void *opaque)
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{
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VFIODevice *vbasedev = opaque;
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VFIOMigration *migration = vbasedev->migration;
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uint64_t data_size;
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int ret;
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qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE);
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if (migration->pending_bytes == 0) {
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ret = vfio_update_pending(vbasedev);
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if (ret) {
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return ret;
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}
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if (migration->pending_bytes == 0) {
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qemu_put_be64(f, 0);
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qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
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/* indicates data finished, goto complete phase */
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return 1;
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}
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}
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ret = vfio_save_buffer(f, vbasedev, &data_size);
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if (ret) {
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error_report("%s: vfio_save_buffer failed %s", vbasedev->name,
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strerror(errno));
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return ret;
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}
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qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
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|
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ret = qemu_file_get_error(f);
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|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Reset pending_bytes as .save_live_pending is not called during savevm or
|
|
* snapshot case, in such case vfio_update_pending() at the start of this
|
|
* function updates pending_bytes.
|
|
*/
|
|
migration->pending_bytes = 0;
|
|
trace_vfio_save_iterate(vbasedev->name, data_size);
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
|
|
{
|
|
VFIODevice *vbasedev = opaque;
|
|
VFIOMigration *migration = vbasedev->migration;
|
|
uint64_t data_size;
|
|
int ret;
|
|
|
|
ret = vfio_migration_set_state(vbasedev, ~VFIO_DEVICE_STATE_V1_RUNNING,
|
|
VFIO_DEVICE_STATE_V1_SAVING);
|
|
if (ret) {
|
|
error_report("%s: Failed to set state STOP and SAVING",
|
|
vbasedev->name);
|
|
return ret;
|
|
}
|
|
|
|
ret = vfio_update_pending(vbasedev);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
while (migration->pending_bytes > 0) {
|
|
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE);
|
|
ret = vfio_save_buffer(f, vbasedev, &data_size);
|
|
if (ret < 0) {
|
|
error_report("%s: Failed to save buffer", vbasedev->name);
|
|
return ret;
|
|
}
|
|
|
|
if (data_size == 0) {
|
|
break;
|
|
}
|
|
|
|
ret = vfio_update_pending(vbasedev);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
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_V1_SAVING, 0);
|
|
if (ret) {
|
|
error_report("%s: Failed to set state STOPPED", vbasedev->name);
|
|
return ret;
|
|
}
|
|
|
|
trace_vfio_save_complete_precopy(vbasedev->name);
|
|
return ret;
|
|
}
|
|
|
|
static void vfio_save_state(QEMUFile *f, void *opaque)
|
|
{
|
|
VFIODevice *vbasedev = opaque;
|
|
int ret;
|
|
|
|
ret = vfio_save_device_config_state(f, opaque);
|
|
if (ret) {
|
|
error_report("%s: Failed to save device config space",
|
|
vbasedev->name);
|
|
qemu_file_set_error(f, ret);
|
|
}
|
|
}
|
|
|
|
static int vfio_load_setup(QEMUFile *f, void *opaque)
|
|
{
|
|
VFIODevice *vbasedev = opaque;
|
|
VFIOMigration *migration = vbasedev->migration;
|
|
int ret = 0;
|
|
|
|
if (migration->region.mmaps) {
|
|
ret = vfio_region_mmap(&migration->region);
|
|
if (ret) {
|
|
error_report("%s: Failed to mmap VFIO migration region %d: %s",
|
|
vbasedev->name, migration->region.nr,
|
|
strerror(-ret));
|
|
error_report("%s: Falling back to slow path", vbasedev->name);
|
|
}
|
|
}
|
|
|
|
ret = vfio_migration_set_state(vbasedev, ~VFIO_DEVICE_STATE_MASK,
|
|
VFIO_DEVICE_STATE_V1_RESUMING);
|
|
if (ret) {
|
|
error_report("%s: Failed to set state RESUMING", vbasedev->name);
|
|
if (migration->region.mmaps) {
|
|
vfio_region_unmap(&migration->region);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int vfio_load_cleanup(void *opaque)
|
|
{
|
|
VFIODevice *vbasedev = opaque;
|
|
|
|
vfio_migration_cleanup(vbasedev);
|
|
trace_vfio_load_cleanup(vbasedev->name);
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
VFIODevice *vbasedev = opaque;
|
|
int ret = 0;
|
|
uint64_t data;
|
|
|
|
data = qemu_get_be64(f);
|
|
while (data != VFIO_MIG_FLAG_END_OF_STATE) {
|
|
|
|
trace_vfio_load_state(vbasedev->name, data);
|
|
|
|
switch (data) {
|
|
case VFIO_MIG_FLAG_DEV_CONFIG_STATE:
|
|
{
|
|
return vfio_load_device_config_state(f, opaque);
|
|
}
|
|
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("%s: SETUP STATE: EOS not found 0x%"PRIx64,
|
|
vbasedev->name, data);
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
}
|
|
case VFIO_MIG_FLAG_DEV_DATA_STATE:
|
|
{
|
|
uint64_t data_size = qemu_get_be64(f);
|
|
|
|
if (data_size) {
|
|
ret = vfio_load_buffer(f, vbasedev, data_size);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
error_report("%s: Unknown tag 0x%"PRIx64, vbasedev->name, data);
|
|
return -EINVAL;
|
|
}
|
|
|
|
data = qemu_get_be64(f);
|
|
ret = qemu_file_get_error(f);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
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,
|
|
.save_state = vfio_save_state,
|
|
.load_setup = vfio_load_setup,
|
|
.load_cleanup = vfio_load_cleanup,
|
|
.load_state = vfio_load_state,
|
|
};
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void vfio_vmstate_change(void *opaque, bool running, RunState state)
|
|
{
|
|
VFIODevice *vbasedev = opaque;
|
|
VFIOMigration *migration = vbasedev->migration;
|
|
uint32_t value, mask;
|
|
int ret;
|
|
|
|
if (vbasedev->migration->vm_running == running) {
|
|
return;
|
|
}
|
|
|
|
if (running) {
|
|
/*
|
|
* Here device state can have one of _SAVING, _RESUMING or _STOP bit.
|
|
* Transition from _SAVING to _RUNNING can happen if there is migration
|
|
* failure, in that case clear _SAVING bit.
|
|
* Transition from _RESUMING to _RUNNING occurs during resuming
|
|
* phase, in that case clear _RESUMING bit.
|
|
* In both the above cases, set _RUNNING bit.
|
|
*/
|
|
mask = ~VFIO_DEVICE_STATE_MASK;
|
|
value = VFIO_DEVICE_STATE_V1_RUNNING;
|
|
} else {
|
|
/*
|
|
* Here device state could be either _RUNNING or _SAVING|_RUNNING. Reset
|
|
* _RUNNING bit
|
|
*/
|
|
mask = ~VFIO_DEVICE_STATE_V1_RUNNING;
|
|
|
|
/*
|
|
* When VM state transition to stop for savevm command, device should
|
|
* start saving data.
|
|
*/
|
|
if (state == RUN_STATE_SAVE_VM) {
|
|
value = VFIO_DEVICE_STATE_V1_SAVING;
|
|
} else {
|
|
value = 0;
|
|
}
|
|
}
|
|
|
|
ret = vfio_migration_set_state(vbasedev, mask, value);
|
|
if (ret) {
|
|
/*
|
|
* Migration should be aborted in this case, but vm_state_notify()
|
|
* currently does not support reporting failures.
|
|
*/
|
|
error_report("%s: Failed to set device state 0x%x", vbasedev->name,
|
|
(migration->device_state & mask) | value);
|
|
qemu_file_set_error(migrate_get_current()->to_dst_file, ret);
|
|
}
|
|
vbasedev->migration->vm_running = running;
|
|
trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state),
|
|
(migration->device_state & mask) | value);
|
|
}
|
|
|
|
static void vfio_migration_state_notifier(Notifier *notifier, void *data)
|
|
{
|
|
MigrationState *s = data;
|
|
VFIOMigration *migration = container_of(notifier, VFIOMigration,
|
|
migration_state);
|
|
VFIODevice *vbasedev = migration->vbasedev;
|
|
int ret;
|
|
|
|
trace_vfio_migration_state_notifier(vbasedev->name,
|
|
MigrationStatus_str(s->state));
|
|
|
|
switch (s->state) {
|
|
case MIGRATION_STATUS_CANCELLING:
|
|
case MIGRATION_STATUS_CANCELLED:
|
|
case MIGRATION_STATUS_FAILED:
|
|
bytes_transferred = 0;
|
|
ret = vfio_migration_set_state(vbasedev,
|
|
~(VFIO_DEVICE_STATE_V1_SAVING |
|
|
VFIO_DEVICE_STATE_V1_RESUMING),
|
|
VFIO_DEVICE_STATE_V1_RUNNING);
|
|
if (ret) {
|
|
error_report("%s: Failed to set state RUNNING", vbasedev->name);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void vfio_migration_exit(VFIODevice *vbasedev)
|
|
{
|
|
VFIOMigration *migration = vbasedev->migration;
|
|
|
|
vfio_region_exit(&migration->region);
|
|
vfio_region_finalize(&migration->region);
|
|
g_free(vbasedev->migration);
|
|
vbasedev->migration = NULL;
|
|
}
|
|
|
|
static int vfio_migration_init(VFIODevice *vbasedev,
|
|
struct vfio_region_info *info)
|
|
{
|
|
int ret;
|
|
Object *obj;
|
|
VFIOMigration *migration;
|
|
char id[256] = "";
|
|
g_autofree char *path = NULL, *oid = NULL;
|
|
|
|
if (!vbasedev->ops->vfio_get_object) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
obj = vbasedev->ops->vfio_get_object(vbasedev);
|
|
if (!obj) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
vbasedev->migration = g_new0(VFIOMigration, 1);
|
|
vbasedev->migration->device_state = VFIO_DEVICE_STATE_V1_RUNNING;
|
|
vbasedev->migration->vm_running = runstate_is_running();
|
|
|
|
ret = vfio_region_setup(obj, vbasedev, &vbasedev->migration->region,
|
|
info->index, "migration");
|
|
if (ret) {
|
|
error_report("%s: Failed to setup VFIO migration region %d: %s",
|
|
vbasedev->name, info->index, strerror(-ret));
|
|
goto err;
|
|
}
|
|
|
|
if (!vbasedev->migration->region.size) {
|
|
error_report("%s: Invalid zero-sized VFIO migration region %d",
|
|
vbasedev->name, info->index);
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
migration = vbasedev->migration;
|
|
migration->vbasedev = vbasedev;
|
|
|
|
oid = vmstate_if_get_id(VMSTATE_IF(DEVICE(obj)));
|
|
if (oid) {
|
|
path = g_strdup_printf("%s/vfio", oid);
|
|
} else {
|
|
path = g_strdup("vfio");
|
|
}
|
|
strpadcpy(id, sizeof(id), path, '\0');
|
|
|
|
register_savevm_live(id, VMSTATE_INSTANCE_ID_ANY, 1, &savevm_vfio_handlers,
|
|
vbasedev);
|
|
|
|
migration->vm_state = qdev_add_vm_change_state_handler(vbasedev->dev,
|
|
vfio_vmstate_change,
|
|
vbasedev);
|
|
migration->migration_state.notify = vfio_migration_state_notifier;
|
|
add_migration_state_change_notifier(&migration->migration_state);
|
|
return 0;
|
|
|
|
err:
|
|
vfio_migration_exit(vbasedev);
|
|
return ret;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
int64_t vfio_mig_bytes_transferred(void)
|
|
{
|
|
return bytes_transferred;
|
|
}
|
|
|
|
int vfio_migration_probe(VFIODevice *vbasedev, Error **errp)
|
|
{
|
|
VFIOContainer *container = vbasedev->group->container;
|
|
struct vfio_region_info *info = NULL;
|
|
int ret = -ENOTSUP;
|
|
|
|
if (!vbasedev->enable_migration || !container->dirty_pages_supported) {
|
|
goto add_blocker;
|
|
}
|
|
|
|
ret = vfio_get_dev_region_info(vbasedev,
|
|
VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
|
|
VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
|
|
&info);
|
|
if (ret) {
|
|
goto add_blocker;
|
|
}
|
|
|
|
ret = vfio_migration_init(vbasedev, info);
|
|
if (ret) {
|
|
goto add_blocker;
|
|
}
|
|
|
|
trace_vfio_migration_probe(vbasedev->name, info->index);
|
|
g_free(info);
|
|
return 0;
|
|
|
|
add_blocker:
|
|
error_setg(&vbasedev->migration_blocker,
|
|
"VFIO device doesn't support migration");
|
|
g_free(info);
|
|
|
|
ret = migrate_add_blocker(vbasedev->migration_blocker, errp);
|
|
if (ret < 0) {
|
|
error_free(vbasedev->migration_blocker);
|
|
vbasedev->migration_blocker = NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void vfio_migration_finalize(VFIODevice *vbasedev)
|
|
{
|
|
if (vbasedev->migration) {
|
|
VFIOMigration *migration = vbasedev->migration;
|
|
|
|
remove_migration_state_change_notifier(&migration->migration_state);
|
|
qemu_del_vm_change_state_handler(migration->vm_state);
|
|
unregister_savevm(VMSTATE_IF(vbasedev->dev), "vfio", vbasedev);
|
|
vfio_migration_exit(vbasedev);
|
|
}
|
|
|
|
if (vbasedev->migration_blocker) {
|
|
migrate_del_blocker(vbasedev->migration_blocker);
|
|
error_free(vbasedev->migration_blocker);
|
|
vbasedev->migration_blocker = NULL;
|
|
}
|
|
}
|