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VFIO updates 2023-02-16

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* Initial v2 migration support for vfio (Avihai Horon)
 
  * Add Cédric as vfio reviewer (Cédric Le Goater)
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Merge tag 'vfio-updates-20230216.0' of https://gitlab.com/alex.williamson/qemu into staging

VFIO updates 2023-02-16

 * Initial v2 migration support for vfio (Avihai Horon)

 * Add Cédric as vfio reviewer (Cédric Le Goater)

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# gpg: Signature made Thu 16 Feb 2023 21:03:17 GMT
# gpg:                using RSA key 42F6C04E540BD1A99E7B8A90239B9B6E3BB08B22
# gpg:                issuer "alex.williamson@redhat.com"
# gpg: Good signature from "Alex Williamson <alex.williamson@redhat.com>" [full]
# gpg:                 aka "Alex Williamson <alex@shazbot.org>" [full]
# gpg:                 aka "Alex Williamson <alwillia@redhat.com>" [full]
# gpg:                 aka "Alex Williamson <alex.l.williamson@gmail.com>" [full]
# Primary key fingerprint: 42F6 C04E 540B D1A9 9E7B  8A90 239B 9B6E 3BB0 8B22

* tag 'vfio-updates-20230216.0' of https://gitlab.com/alex.williamson/qemu:
  MAINTAINERS: Add myself as VFIO reviewer
  docs/devel: Align VFIO migration docs to v2 protocol
  vfio: Alphabetize migration section of VFIO trace-events file
  vfio/migration: Remove VFIO migration protocol v1
  vfio/migration: Implement VFIO migration protocol v2
  vfio/migration: Rename functions/structs related to v1 protocol
  vfio/migration: Move migration v1 logic to vfio_migration_init()
  vfio/migration: Block multiple devices migration
  vfio/common: Change vfio_devices_all_running_and_saving() logic to equivalent one
  vfio/migration: Allow migration without VFIO IOMMU dirty tracking support
  vfio/migration: Fix NULL pointer dereference bug
  linux-headers: Update to v6.2-rc8

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2023-02-20 17:08:05 +00:00
commit 9b0699ab80
19 changed files with 625 additions and 609 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
MAINTAINERS
View File

@ -1995,6 +1995,7 @@ F: hw/usb/dev-serial.c
VFIO
M: Alex Williamson <alex.williamson@redhat.com>
R: Cédric Le Goater <clg@redhat.com>
S: Supported
F: hw/vfio/*
F: include/hw/vfio/

72
docs/devel/vfio-migration.rst
View File

@ -7,46 +7,43 @@ the guest is running on source host and restoring this saved state on the
destination host. This document details how saving and restoring of VFIO
devices is done in QEMU.
Migration of VFIO devices consists of two phases: the optional pre-copy phase,
and the stop-and-copy phase. The pre-copy phase is iterative and allows to
accommodate VFIO devices that have a large amount of data that needs to be
transferred. The iterative pre-copy phase of migration allows for the guest to
continue whilst the VFIO device state is transferred to the destination, this
helps to reduce the total downtime of the VM. VFIO devices can choose to skip
the pre-copy phase of migration by returning pending_bytes as zero during the
pre-copy phase.
Migration of VFIO devices currently consists of a single stop-and-copy phase.
During the stop-and-copy phase the guest is stopped and the entire VFIO device
data is transferred to the destination.
The pre-copy phase of migration is currently not supported for VFIO devices.
Support for VFIO pre-copy will be added later on.
Note that currently VFIO migration is supported only for a single device. This
is due to VFIO migration's lack of P2P support. However, P2P support is planned
to be added later on.
A detailed description of the UAPI for VFIO device migration can be found in
the comment for the ``vfio_device_migration_info`` structure in the header
file linux-headers/linux/vfio.h.
the comment for the ``vfio_device_mig_state`` structure in the header file
linux-headers/linux/vfio.h.
VFIO implements the device hooks for the iterative approach as follows:
* A ``save_setup`` function that sets up the migration region and sets _SAVING
flag in the VFIO device state.
* A ``save_setup`` function that sets up migration on the source.
* A ``load_setup`` function that sets up the migration region on the
destination and sets _RESUMING flag in the VFIO device state.
* A ``load_setup`` function that sets the VFIO device on the destination in
_RESUMING state.
* A ``state_pending_exact`` function that reads pending_bytes from the vendor
driver, which indicates the amount of data that the vendor driver has yet to
save for the VFIO device.
* A ``save_live_iterate`` function that reads the VFIO device's data from the
vendor driver through the migration region during iterative phase.
* A ``save_state`` function to save the device config space if it is present.
* A ``save_live_complete_precopy`` function that resets _RUNNING flag from the
VFIO device state and iteratively copies the remaining data for the VFIO
device until the vendor driver indicates that no data remains (pending bytes
is zero).
* A ``save_live_complete_precopy`` function that sets the VFIO device in
_STOP_COPY state and iteratively copies the data for the VFIO device until
the vendor driver indicates that no data remains.
* A ``load_state`` function that loads the config section and the data
sections that are generated by the save functions above
sections that are generated by the save functions above.
* ``cleanup`` functions for both save and load that perform any migration
related cleanup, including unmapping the migration region
related cleanup.
The VFIO migration code uses a VM state change handler to change the VFIO
@ -71,13 +68,13 @@ tracking can identify dirtied pages, but any page pinned by the vendor driver
can also be written by the device. There is currently no device or IOMMU
support for dirty page tracking in hardware.
By default, dirty pages are tracked when the device is in pre-copy as well as
stop-and-copy phase. So, a page pinned by the vendor driver will be copied to
the destination in both phases. Copying dirty pages in pre-copy phase helps
QEMU to predict if it can achieve its downtime tolerances. If QEMU during
pre-copy phase keeps finding dirty pages continuously, then it understands
that even in stop-and-copy phase, it is likely to find dirty pages and can
predict the downtime accordingly.
By default, dirty pages are tracked during pre-copy as well as stop-and-copy
phase. So, a page pinned by the vendor driver will be copied to the destination
in both phases. Copying dirty pages in pre-copy phase helps QEMU to predict if
it can achieve its downtime tolerances. If QEMU during pre-copy phase keeps
finding dirty pages continuously, then it understands that even in stop-and-copy
phase, it is likely to find dirty pages and can predict the downtime
accordingly.
QEMU also provides a per device opt-out option ``pre-copy-dirty-page-tracking``
which disables querying the dirty bitmap during pre-copy phase. If it is set to
@ -111,23 +108,22 @@ Live migration save path
|
migrate_init spawns migration_thread
Migration thread then calls each device's .save_setup()
(RUNNING, _SETUP, _RUNNING|_SAVING)
(RUNNING, _SETUP, _RUNNING)
|
(RUNNING, _ACTIVE, _RUNNING|_SAVING)
(RUNNING, _ACTIVE, _RUNNING)
If device is active, get pending_bytes by .state_pending_exact()
If total pending_bytes >= threshold_size, call .save_live_iterate()
Data of VFIO device for pre-copy phase is copied
Iterate till total pending bytes converge and are less than threshold
|
On migration completion, vCPU stops and calls .save_live_complete_precopy for
each active device. The VFIO device is then transitioned into _SAVING state
(FINISH_MIGRATE, _DEVICE, _SAVING)
each active device. The VFIO device is then transitioned into _STOP_COPY state
(FINISH_MIGRATE, _DEVICE, _STOP_COPY)
|
For the VFIO device, iterate in .save_live_complete_precopy until
pending data is 0
(FINISH_MIGRATE, _DEVICE, _STOPPED)
(FINISH_MIGRATE, _DEVICE, _STOP)
|
(FINISH_MIGRATE, _COMPLETED, _STOPPED)
(FINISH_MIGRATE, _COMPLETED, _STOP)
Migraton thread schedules cleanup bottom half and exits
Live migration resume path
@ -136,7 +132,7 @@ Live migration resume path
::
Incoming migration calls .load_setup for each device
(RESTORE_VM, _ACTIVE, _STOPPED)
(RESTORE_VM, _ACTIVE, _STOP)
|
For each device, .load_state is called for that device section data
(RESTORE_VM, _ACTIVE, _RESUMING)

92
hw/vfio/common.c
View File

@ -40,6 +40,8 @@
#include "trace.h"
#include "qapi/error.h"
#include "migration/migration.h"
#include "migration/misc.h"
#include "migration/blocker.h"
#include "sysemu/tpm.h"
VFIOGroupList vfio_group_list =
@ -336,6 +338,58 @@ bool vfio_mig_active(void)
return true;
}
static Error *multiple_devices_migration_blocker;
static unsigned int vfio_migratable_device_num(void)
{
VFIOGroup *group;
VFIODevice *vbasedev;
unsigned int device_num = 0;
QLIST_FOREACH(group, &vfio_group_list, next) {
QLIST_FOREACH(vbasedev, &group->device_list, next) {
if (vbasedev->migration) {
device_num++;
}
}
}
return device_num;
}
int vfio_block_multiple_devices_migration(Error **errp)
{
int ret;
if (multiple_devices_migration_blocker ||
vfio_migratable_device_num() <= 1) {
return 0;
}
error_setg(&multiple_devices_migration_blocker,
"Migration is currently not supported with multiple "
"VFIO devices");
ret = migrate_add_blocker(multiple_devices_migration_blocker, errp);
if (ret < 0) {
error_free(multiple_devices_migration_blocker);
multiple_devices_migration_blocker = NULL;
}
return ret;
}
void vfio_unblock_multiple_devices_migration(void)
{
if (!multiple_devices_migration_blocker ||
vfio_migratable_device_num() > 1) {
return;
}
migrate_del_blocker(multiple_devices_migration_blocker);
error_free(multiple_devices_migration_blocker);
multiple_devices_migration_blocker = NULL;
}
static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
{
VFIOGroup *group;
@ -354,8 +408,8 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
return false;
}
if ((vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF)
&& (migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) {
if (vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF &&
migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
return false;
}
}
@ -363,13 +417,16 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container)
return true;
}
static bool vfio_devices_all_running_and_saving(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)
{
VFIOGroup *group;
VFIODevice *vbasedev;
MigrationState *ms = migrate_get_current();
if (!migration_is_setup_or_active(ms->state)) {
if (!migration_is_active(migrate_get_current())) {
return false;
}
@ -381,8 +438,7 @@ static bool vfio_devices_all_running_and_saving(VFIOContainer *container)
return false;
}
if ((migration->device_state & VFIO_DEVICE_STATE_V1_SAVING) &&
(migration->device_state & VFIO_DEVICE_STATE_V1_RUNNING)) {
if (migration->device_state == VFIO_DEVICE_STATE_RUNNING) {
continue;
} else {
return false;
@ -461,7 +517,7 @@ static int vfio_dma_unmap(VFIOContainer *container,
};
if (iotlb && container->dirty_pages_supported &&
vfio_devices_all_running_and_saving(container)) {
vfio_devices_all_running_and_mig_active(container)) {
return vfio_dma_unmap_bitmap(container, iova, size, iotlb);
}
@ -488,6 +544,12 @@ static int vfio_dma_unmap(VFIOContainer *container,
return -errno;
}
if (iotlb && vfio_devices_all_running_and_mig_active(container)) {
cpu_physical_memory_set_dirty_range(iotlb->translated_addr, size,
tcg_enabled() ? DIRTY_CLIENTS_ALL :
DIRTY_CLIENTS_NOCODE);
}
return 0;
}
@ -1201,6 +1263,10 @@ static void vfio_set_dirty_page_tracking(VFIOContainer *container, bool start)
.argsz = sizeof(dirty),
};
if (!container->dirty_pages_supported) {
return;
}
if (start) {
dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START;
} else {
@ -1236,6 +1302,13 @@ static int vfio_get_dirty_bitmap(VFIOContainer *container, uint64_t iova,
uint64_t pages;
int ret;
if (!container->dirty_pages_supported) {
cpu_physical_memory_set_dirty_range(ram_addr, size,
tcg_enabled() ? DIRTY_CLIENTS_ALL :
DIRTY_CLIENTS_NOCODE);
return 0;
}
dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range));
dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range);
@ -1409,8 +1482,7 @@ static void vfio_listener_log_sync(MemoryListener *listener,
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
if (vfio_listener_skipped_section(section) ||
!container->dirty_pages_supported) {
if (vfio_listener_skipped_section(section)) {
return;
}

750
hw/vfio/migration.c
View File

@ -10,6 +10,7 @@
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "qemu/cutils.h"
#include "qemu/units.h"
#include <linux/vfio.h>
#include <sys/ioctl.h>
@ -44,310 +45,124 @@
#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL)
#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL)
/*
* This is an arbitrary size based on migration of mlx5 devices, where typically
* total device migration size is on the order of 100s of MB. Testing with
* larger values, e.g. 128MB and 1GB, did not show a performance improvement.
*/
#define VFIO_MIG_DEFAULT_DATA_BUFFER_SIZE (1 * MiB)
static int64_t bytes_transferred;
static inline int vfio_mig_access(VFIODevice *vbasedev, void *val, int count,
off_t off, bool iswrite)
static const char *mig_state_to_str(enum vfio_device_mig_state state)
{
int ret;
ret = iswrite ? pwrite(vbasedev->fd, val, count, off) :
pread(vbasedev->fd, val, count, off);
if (ret < count) {
error_report("vfio_mig_%s %d byte %s: failed at offset 0x%"
HWADDR_PRIx", err: %s", iswrite ? "write" : "read", count,
vbasedev->name, off, strerror(errno));
return (ret < 0) ? ret : -EINVAL;
switch (state) {
case VFIO_DEVICE_STATE_ERROR:
return "ERROR";
case VFIO_DEVICE_STATE_STOP:
return "STOP";
case VFIO_DEVICE_STATE_RUNNING:
return "RUNNING";
case VFIO_DEVICE_STATE_STOP_COPY:
return "STOP_COPY";
case VFIO_DEVICE_STATE_RESUMING:
return "RESUMING";
default:
return "UNKNOWN STATE";
}
return 0;
}
static int vfio_mig_rw(VFIODevice *vbasedev, __u8 *buf, size_t count,
off_t off, bool iswrite)
{
int ret, done = 0;
__u8 *tbuf = buf;
while (count) {
int bytes = 0;
if (count >= 8 && !(off % 8)) {
bytes = 8;
} else if (count >= 4 && !(off % 4)) {
bytes = 4;
} else if (count >= 2 && !(off % 2)) {
bytes = 2;
} else {
bytes = 1;
}
ret = vfio_mig_access(vbasedev, tbuf, bytes, off, iswrite);
if (ret) {
return ret;
}
count -= bytes;
done += bytes;
off += bytes;
tbuf += bytes;
}
return done;
}
#define vfio_mig_read(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, false)
#define vfio_mig_write(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, true)
#define VFIO_MIG_STRUCT_OFFSET(f) \
offsetof(struct vfio_device_migration_info, f)
/*
* Change the device_state register for device @vbasedev. Bits set in @mask
* are preserved, bits set in @value are set, and bits not set in either @mask
* or @value are cleared in device_state. If the register cannot be accessed,
* the resulting state would be invalid, or the device enters an error state,
* an error is returned.
*/
static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t mask,
uint32_t value)
static int vfio_migration_set_state(VFIODevice *vbasedev,
enum vfio_device_mig_state new_state,
enum vfio_device_mig_state recover_state)
{
VFIOMigration *migration = vbasedev->migration;
VFIORegion *region = &migration->region;
off_t dev_state_off = region->fd_offset +
VFIO_MIG_STRUCT_OFFSET(device_state);
uint32_t device_state;
uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
sizeof(struct vfio_device_feature_mig_state),
sizeof(uint64_t))] = {};
struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
struct vfio_device_feature_mig_state *mig_state =
(struct vfio_device_feature_mig_state *)feature->data;
int ret;
ret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
dev_state_off);
if (ret < 0) {
feature->argsz = sizeof(buf);
feature->flags =
VFIO_DEVICE_FEATURE_SET | VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE;
mig_state->device_state = new_state;
if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
/* Try to set the device in some good state */
ret = -errno;
if (recover_state == VFIO_DEVICE_STATE_ERROR) {
error_report("%s: Failed setting device state to %s, err: %s. "
"Recover state is ERROR. Resetting device",
vbasedev->name, mig_state_to_str(new_state),
strerror(errno));
goto reset_device;
}
error_report(
"%s: Failed setting device state to %s, err: %s. Setting device in recover state %s",
vbasedev->name, mig_state_to_str(new_state),
strerror(errno), mig_state_to_str(recover_state));
mig_state->device_state = recover_state;
if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
ret = -errno;
error_report(
"%s: Failed setting device in recover state, err: %s. Resetting device",
vbasedev->name, strerror(errno));
goto reset_device;
}
migration->device_state = recover_state;
return ret;
}
device_state = (device_state & mask) | value;
if (!VFIO_DEVICE_STATE_VALID(device_state)) {
return -EINVAL;
}
ret = vfio_mig_write(vbasedev, &device_state, sizeof(device_state),
dev_state_off);
if (ret < 0) {
int rret;
rret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
dev_state_off);
if ((rret < 0) || (VFIO_DEVICE_STATE_IS_ERROR(device_state))) {
hw_error("%s: Device in error state 0x%x", vbasedev->name,
device_state);
return rret ? rret : -EIO;
}
return ret;
}
migration->device_state = device_state;
trace_vfio_migration_set_state(vbasedev->name, device_state);
return 0;
}
static void *get_data_section_size(VFIORegion *region, uint64_t data_offset,
uint64_t data_size, uint64_t *size)
{
void *ptr = NULL;
uint64_t limit = 0;
int i;
if (!region->mmaps) {
if (size) {
*size = MIN(data_size, region->size - data_offset);
}
return ptr;
}
for (i = 0; i < region->nr_mmaps; i++) {
VFIOMmap *map = region->mmaps + i;
if ((data_offset >= map->offset) &&
(data_offset < map->offset + map->size)) {
/* check if data_offset is within sparse mmap areas */
ptr = map->mmap + data_offset - map->offset;
if (size) {
*size = MIN(data_size, map->offset + map->size - data_offset);
}
break;
} else if ((data_offset < map->offset) &&
(!limit || limit > map->offset)) {
migration->device_state = new_state;
if (mig_state->data_fd != -1) {
if (migration->data_fd != -1) {
/*
* data_offset is not within sparse mmap areas, find size of
* non-mapped area. Check through all list since region->mmaps list
* is not sorted.
* This can happen if the device is asynchronously reset and
* terminates a data transfer.
*/
limit = map->offset;
}
error_report("%s: data_fd out of sync", vbasedev->name);
close(mig_state->data_fd);
return -EBADF;
}
if (!ptr && size) {
*size = limit ? MIN(data_size, limit - data_offset) : data_size;
}
return ptr;
}
static int vfio_save_buffer(QEMUFile *f, VFIODevice *vbasedev, uint64_t *size)
{
VFIOMigration *migration = vbasedev->migration;
VFIORegion *region = &migration->region;
uint64_t data_offset = 0, data_size = 0, sz;
int ret;
ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset));
if (ret < 0) {
return ret;
migration->data_fd = mig_state->data_fd;
}
ret = vfio_mig_read(vbasedev, &data_size, sizeof(data_size),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size));
if (ret < 0) {
return ret;
trace_vfio_migration_set_state(vbasedev->name, mig_state_to_str(new_state));
return 0;
reset_device:
if (ioctl(vbasedev->fd, VFIO_DEVICE_RESET)) {
hw_error("%s: Failed resetting device, err: %s", vbasedev->name,
strerror(errno));
}
trace_vfio_save_buffer(vbasedev->name, data_offset, data_size,
migration->pending_bytes);
migration->device_state = VFIO_DEVICE_STATE_RUNNING;
qemu_put_be64(f, data_size);
sz = data_size;
while (sz) {
void *buf;
uint64_t sec_size;
bool buf_allocated = false;
buf = get_data_section_size(region, data_offset, sz, &sec_size);
if (!buf) {
buf = g_try_malloc(sec_size);
if (!buf) {
error_report("%s: Error allocating buffer ", __func__);
return -ENOMEM;
}
buf_allocated = true;
ret = vfio_mig_read(vbasedev, buf, sec_size,
region->fd_offset + data_offset);
if (ret < 0) {
g_free(buf);
return ret;
}
}
qemu_put_buffer(f, buf, sec_size);
if (buf_allocated) {
g_free(buf);
}
sz -= sec_size;
data_offset += sec_size;
}
ret = qemu_file_get_error(f);
if (!ret && size) {
*size = data_size;
}
bytes_transferred += data_size;
return ret;
}
static int vfio_load_buffer(QEMUFile *f, VFIODevice *vbasedev,
uint64_t data_size)
{
VFIORegion *region = &vbasedev->migration->region;
uint64_t data_offset = 0, size, report_size;
int ret;
do {
ret = vfio_mig_read(vbasedev, &data_offset, sizeof(data_offset),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_offset));
if (ret < 0) {
return ret;
}
if (data_offset + data_size > region->size) {
/*
* If data_size is greater than the data section of migration region
* then iterate the write buffer operation. This case can occur if
* size of migration region at destination is smaller than size of
* migration region at source.
*/
report_size = size = region->size - data_offset;
data_size -= size;
} else {
report_size = size = data_size;
data_size = 0;
}
trace_vfio_load_state_device_data(vbasedev->name, data_offset, size);
while (size) {
void *buf;
uint64_t sec_size;
bool buf_alloc = false;
buf = get_data_section_size(region, data_offset, size, &sec_size);
if (!buf) {
buf = g_try_malloc(sec_size);
if (!buf) {
error_report("%s: Error allocating buffer ", __func__);
return -ENOMEM;
}
buf_alloc = true;
}
qemu_get_buffer(f, buf, sec_size);
if (buf_alloc) {
ret = vfio_mig_write(vbasedev, buf, sec_size,
region->fd_offset + data_offset);
g_free(buf);
if (ret < 0) {
return ret;
}
}
size -= sec_size;
data_offset += sec_size;
}
ret = vfio_mig_write(vbasedev, &report_size, sizeof(report_size),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(data_size));
if (ret < 0) {
return ret;
}
} while (data_size);
return 0;
}
static int vfio_update_pending(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
VFIORegion *region = &migration->region;
uint64_t pending_bytes = 0;
int ret;
ret = vfio_mig_read(vbasedev, &pending_bytes, sizeof(pending_bytes),
region->fd_offset + VFIO_MIG_STRUCT_OFFSET(pending_bytes));
if (ret < 0) {
migration->pending_bytes = 0;
return ret;
}
ret = qemu_file_get_to_fd(f, migration->data_fd, data_size);
trace_vfio_load_state_device_data(vbasedev->name, data_size, ret);
migration->pending_bytes = pending_bytes;
trace_vfio_update_pending(vbasedev->name, pending_bytes);
return 0;
return ret;
}
static int vfio_save_device_config_state(QEMUFile *f, void *opaque)
@ -398,9 +213,55 @@ static void vfio_migration_cleanup(VFIODevice *vbasedev)
{
VFIOMigration *migration = vbasedev->migration;
if (migration->region.mmaps) {
vfio_region_unmap(&migration->region);
close(migration->data_fd);
migration->data_fd = -1;
}
static int vfio_query_stop_copy_size(VFIODevice *vbasedev,
uint64_t *stop_copy_size)
{
uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
sizeof(struct vfio_device_feature_mig_data_size),
sizeof(uint64_t))] = {};
struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
struct vfio_device_feature_mig_data_size *mig_data_size =
(struct vfio_device_feature_mig_data_size *)feature->data;
feature->argsz = sizeof(buf);
feature->flags =
VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_MIG_DATA_SIZE;
if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
return -errno;
}
*stop_copy_size = mig_data_size->stop_copy_length;
return 0;
}
/* Returns 1 if end-of-stream is reached, 0 if more data and -errno if error */
static int vfio_save_block(QEMUFile *f, VFIOMigration *migration)
{
ssize_t data_size;
data_size = read(migration->data_fd, migration->data_buffer,
migration->data_buffer_size);
if (data_size < 0) {
return -errno;
}
if (data_size == 0) {
return 1;
}
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE);
qemu_put_be64(f, data_size);
qemu_put_buffer(f, migration->data_buffer, data_size);
bytes_transferred += data_size;
trace_vfio_save_block(migration->vbasedev->name, data_size);
return qemu_file_get_error(f);
}
/* ---------------------------------------------------------------------- */
@ -409,169 +270,100 @@ static int vfio_save_setup(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
int ret;
trace_vfio_save_setup(vbasedev->name);
uint64_t stop_copy_size = VFIO_MIG_DEFAULT_DATA_BUFFER_SIZE;
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE);
if (migration->region.mmaps) {
/*
* Calling vfio_region_mmap() from migration thread. Memory API called
* from this function require locking the iothread when called from
* outside the main loop thread.
*/
qemu_mutex_lock_iothread();
ret = vfio_region_mmap(&migration->region);
qemu_mutex_unlock_iothread();
if (ret) {
error_report("%s: Failed to mmap VFIO migration region: %s",
vbasedev->name, strerror(-ret));
error_report("%s: Falling back to slow path", vbasedev->name);
}
vfio_query_stop_copy_size(vbasedev, &stop_copy_size);
migration->data_buffer_size = MIN(VFIO_MIG_DEFAULT_DATA_BUFFER_SIZE,
stop_copy_size);
migration->data_buffer = g_try_malloc0(migration->data_buffer_size);
if (!migration->data_buffer) {
error_report("%s: Failed to allocate migration data buffer",
vbasedev->name);
return -ENOMEM;
}
ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_MASK,
VFIO_DEVICE_STATE_V1_SAVING);
if (ret) {
error_report("%s: Failed to set state SAVING", vbasedev->name);
return ret;
}
trace_vfio_save_setup(vbasedev->name, migration->data_buffer_size);
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
return 0;
return qemu_file_get_error(f);
}
static void vfio_save_cleanup(void *opaque)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
g_free(migration->data_buffer);
migration->data_buffer = NULL;
vfio_migration_cleanup(vbasedev);
trace_vfio_save_cleanup(vbasedev->name);
}
static void vfio_state_pending(void *opaque, uint64_t *must_precopy,
/*
* Migration size of VFIO devices can be as little as a few KBs or as big as
* many GBs. This value should be big enough to cover the worst case.
*/
#define VFIO_MIG_STOP_COPY_SIZE (100 * GiB)
/*
* Only exact function is implemented and not estimate function. The reason is
* that during pre-copy phase of migration the estimate function is called
* repeatedly while pending RAM size is over the threshold, thus migration
* can't converge and querying the VFIO device pending data size is useless.
*/
static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy,
uint64_t *can_postcopy)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
int ret;
uint64_t stop_copy_size = VFIO_MIG_STOP_COPY_SIZE;
ret = vfio_update_pending(vbasedev);
if (ret) {
return;
}
/*
* If getting pending migration size fails, VFIO_MIG_STOP_COPY_SIZE is
* reported so downtime limit won't be violated.
*/
vfio_query_stop_copy_size(vbasedev, &stop_copy_size);
*must_precopy += stop_copy_size;
*must_precopy += migration->pending_bytes;
trace_vfio_state_pending(vbasedev->name, *must_precopy, *can_postcopy);
trace_vfio_state_pending_exact(vbasedev->name, *must_precopy, *can_postcopy,
stop_copy_size);
}
static int vfio_save_iterate(QEMUFile *f, void *opaque)
static int vfio_save_complete_precopy(QEMUFile *f, void *opaque)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
uint64_t data_size;
int ret;
qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE);
if (migration->pending_bytes == 0) {
ret = vfio_update_pending(vbasedev);
/* We reach here with device state STOP only */
ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP_COPY,
VFIO_DEVICE_STATE_STOP);
if (ret) {
return ret;
}
if (migration->pending_bytes == 0) {
qemu_put_be64(f, 0);
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
/* indicates data finished, goto complete phase */
return 1;
}
}
ret = vfio_save_buffer(f, vbasedev, &data_size);
if (ret) {
error_report("%s: vfio_save_buffer failed %s", vbasedev->name,
strerror(errno));
do {
ret = vfio_save_block(f, vbasedev->migration);
if (ret < 0) {
return ret;
}
} while (!ret);
qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
/*
* Reset pending_bytes as state_pending* are not called during
* savevm or snapshot case, in such case vfio_update_pending() at
* the start of this function updates pending_bytes.
* If setting the device in STOP state fails, the device should be reset.
* To do so, use ERROR state as a recover state.
*/
migration->pending_bytes = 0;
trace_vfio_save_iterate(vbasedev->name, data_size);
return 0;
}
ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_STOP,
VFIO_DEVICE_STATE_ERROR);
trace_vfio_save_complete_precopy(vbasedev->name, ret);
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;
}
@ -591,28 +383,9 @@ static void vfio_save_state(QEMUFile *f, void *opaque)
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;
return vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RESUMING,
vbasedev->migration->device_state);
}
static int vfio_load_cleanup(void *opaque)
@ -621,6 +394,7 @@ static int vfio_load_cleanup(void *opaque)
vfio_migration_cleanup(vbasedev);
trace_vfio_load_cleanup(vbasedev->name);
return 0;
}
@ -678,12 +452,10 @@ static int vfio_load_state(QEMUFile *f, void *opaque, int version_id)
return ret;
}
static SaveVMHandlers savevm_vfio_handlers = {
static const SaveVMHandlers savevm_vfio_handlers = {
.save_setup = vfio_save_setup,
.save_cleanup = vfio_save_cleanup,
.state_pending_exact = vfio_state_pending,
.state_pending_estimate = vfio_state_pending,
.save_live_iterate = vfio_save_iterate,
.state_pending_exact = vfio_state_pending_exact,
.save_live_complete_precopy = vfio_save_complete_precopy,
.save_state = vfio_save_state,
.load_setup = vfio_load_setup,
@ -696,56 +468,33 @@ static SaveVMHandlers savevm_vfio_handlers = {
static void vfio_vmstate_change(void *opaque, bool running, RunState state)
{
VFIODevice *vbasedev = opaque;
VFIOMigration *migration = vbasedev->migration;
uint32_t value, mask;
enum vfio_device_mig_state new_state;
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;
new_state = VFIO_DEVICE_STATE_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;
}
new_state = VFIO_DEVICE_STATE_STOP;
}
ret = vfio_migration_set_state(vbasedev, mask, value);
/*
* If setting the device in new_state fails, the device should be reset.
* To do so, use ERROR state as a recover state.
*/
ret = vfio_migration_set_state(vbasedev, new_state,
VFIO_DEVICE_STATE_ERROR);
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);
if (migrate_get_current()->to_dst_file) {
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);
mig_state_to_str(new_state));
}
static void vfio_migration_state_notifier(Notifier *notifier, void *data)
@ -754,7 +503,6 @@ static void vfio_migration_state_notifier(Notifier *notifier, void *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));
@ -764,34 +512,57 @@ static void vfio_migration_state_notifier(Notifier *notifier, void *data)
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);
}
/*
* If setting the device in RUNNING state fails, the device should
* be reset. To do so, use ERROR state as a recover state.
*/
vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_RUNNING,
VFIO_DEVICE_STATE_ERROR);
}
}
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)
static int vfio_migration_query_flags(VFIODevice *vbasedev, uint64_t *mig_flags)
{
uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
sizeof(struct vfio_device_feature_migration),
sizeof(uint64_t))] = {};
struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
struct vfio_device_feature_migration *mig =
(struct vfio_device_feature_migration *)feature->data;
feature->argsz = sizeof(buf);
feature->flags = VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_MIGRATION;
if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
if (errno == ENOTTY) {
error_report("%s: VFIO migration is not supported in kernel",
vbasedev->name);
} else {
error_report("%s: Failed to query VFIO migration support, err: %s",
vbasedev->name, strerror(errno));
}
return -errno;
}
*mig_flags = mig->flags;
return 0;
}
static int vfio_migration_init(VFIODevice *vbasedev)
{
int ret;
Object *obj;
VFIOMigration *migration;
char id[256] = "";
g_autofree char *path = NULL, *oid = NULL;
uint64_t mig_flags = 0;
if (!vbasedev->ops->vfio_get_object) {
return -EINVAL;
@ -802,27 +573,21 @@ static int vfio_migration_init(VFIODevice *vbasedev,
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");
ret = vfio_migration_query_flags(vbasedev, &mig_flags);
if (ret) {
error_report("%s: Failed to setup VFIO migration region %d: %s",
vbasedev->name, info->index, strerror(-ret));
goto err;
return ret;
}
if (!vbasedev->migration->region.size) {
error_report("%s: Invalid zero-sized VFIO migration region %d",
vbasedev->name, info->index);
ret = -EINVAL;
goto err;
/* Basic migration functionality must be supported */
if (!(mig_flags & VFIO_MIGRATION_STOP_COPY)) {
return -EOPNOTSUPP;
}
vbasedev->migration = g_new0(VFIOMigration, 1);
migration = vbasedev->migration;
migration->vbasedev = vbasedev;
migration->device_state = VFIO_DEVICE_STATE_RUNNING;
migration->data_fd = -1;
oid = vmstate_if_get_id(VMSTATE_IF(DEVICE(obj)));
if (oid) {
@ -840,11 +605,8 @@ static int vfio_migration_init(VFIODevice *vbasedev,
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;
return 0;
}
/* ---------------------------------------------------------------------- */
@ -856,35 +618,28 @@ int64_t vfio_mig_bytes_transferred(void)
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) {
if (!vbasedev->enable_migration) {
goto add_blocker;
}
ret = vfio_get_dev_region_info(vbasedev,
VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
&info);
ret = vfio_migration_init(vbasedev);
if (ret) {
goto add_blocker;
}
ret = vfio_migration_init(vbasedev, info);
ret = vfio_block_multiple_devices_migration(errp);
if (ret) {
goto add_blocker;
return ret;
}
trace_vfio_migration_probe(vbasedev->name, info->index);
g_free(info);
trace_vfio_migration_probe(vbasedev->name);
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) {
@ -903,6 +658,7 @@ void vfio_migration_finalize(VFIODevice *vbasedev)
qemu_del_vm_change_state_handler(migration->vm_state);
unregister_savevm(VMSTATE_IF(vbasedev->dev), "vfio", vbasedev);
vfio_migration_exit(vbasedev);
vfio_unblock_multiple_devices_migration();
}
if (vbasedev->migration_blocker) {

30
hw/vfio/trace-events
View File

@ -119,6 +119,8 @@ vfio_region_sparse_mmap_header(const char *name, int index, int nr_areas) "Devic
vfio_region_sparse_mmap_entry(int i, unsigned long start, unsigned long end) "sparse entry %d [0x%lx - 0x%lx]"
vfio_get_dev_region(const char *name, int index, uint32_t type, uint32_t subtype) "%s index %d, %08x/%0x8"
vfio_dma_unmap_overflow_workaround(void) ""
vfio_get_dirty_bitmap(int fd, uint64_t iova, uint64_t size, uint64_t bitmap_size, uint64_t start) "container fd=%d, iova=0x%"PRIx64" size= 0x%"PRIx64" bitmap_size=0x%"PRIx64" start=0x%"PRIx64
vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu dirty @ 0x%"PRIx64" - 0x%"PRIx64
# platform.c
vfio_platform_base_device_init(char *name, int groupid) "%s belongs to group #%d"
@ -148,21 +150,17 @@ vfio_display_edid_update(uint32_t prefx, uint32_t prefy) "%ux%u"
vfio_display_edid_write_error(void) ""
# migration.c
vfio_migration_probe(const char *name, uint32_t index) " (%s) Region %d"
vfio_migration_set_state(const char *name, uint32_t state) " (%s) state %d"
vfio_vmstate_change(const char *name, int running, const char *reason, uint32_t dev_state) " (%s) running %d reason %s device state %d"
vfio_migration_state_notifier(const char *name, const char *state) " (%s) state %s"
vfio_save_setup(const char *name) " (%s)"
vfio_save_cleanup(const char *name) " (%s)"
vfio_save_buffer(const char *name, uint64_t data_offset, uint64_t data_size, uint64_t pending) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64" pending 0x%"PRIx64
vfio_update_pending(const char *name, uint64_t pending) " (%s) pending 0x%"PRIx64
vfio_save_device_config_state(const char *name) " (%s)"
vfio_state_pending(const char *name, uint64_t precopy, uint64_t postcopy) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64
vfio_save_iterate(const char *name, int data_size) " (%s) data_size %d"
vfio_save_complete_precopy(const char *name) " (%s)"
vfio_load_cleanup(const char *name) " (%s)"
vfio_load_device_config_state(const char *name) " (%s)"
vfio_load_state(const char *name, uint64_t data) " (%s) data 0x%"PRIx64
vfio_load_state_device_data(const char *name, uint64_t data_offset, uint64_t data_size) " (%s) Offset 0x%"PRIx64" size 0x%"PRIx64
vfio_load_cleanup(const char *name) " (%s)"
vfio_get_dirty_bitmap(int fd, uint64_t iova, uint64_t size, uint64_t bitmap_size, uint64_t start) "container fd=%d, iova=0x%"PRIx64" size= 0x%"PRIx64" bitmap_size=0x%"PRIx64" start=0x%"PRIx64
vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu dirty @ 0x%"PRIx64" - 0x%"PRIx64
vfio_load_state_device_data(const char *name, uint64_t data_size, int ret) " (%s) size 0x%"PRIx64" ret %d"
vfio_migration_probe(const char *name) " (%s)"
vfio_migration_set_state(const char *name, const char *state) " (%s) state %s"
vfio_migration_state_notifier(const char *name, const char *state) " (%s) state %s"
vfio_save_block(const char *name, int data_size) " (%s) data_size %d"
vfio_save_cleanup(const char *name) " (%s)"
vfio_save_complete_precopy(const char *name, int ret) " (%s) ret %d"
vfio_save_device_config_state(const char *name) " (%s)"
vfio_save_setup(const char *name, uint64_t data_buffer_size) " (%s) data buffer size 0x%"PRIx64
vfio_state_pending_exact(const char *name, uint64_t precopy, uint64_t postcopy, uint64_t stopcopy_size) " (%s) precopy 0x%"PRIx64" postcopy 0x%"PRIx64" stopcopy size 0x%"PRIx64
vfio_vmstate_change(const char *name, int running, const char *reason, const char *dev_state) " (%s) running %d reason %s device state %s"

10
include/hw/vfio/vfio-common.h
View File

@ -61,11 +61,11 @@ typedef struct VFIORegion {
typedef struct VFIOMigration {
struct VFIODevice *vbasedev;
VMChangeStateEntry *vm_state;
VFIORegion region;
uint32_t device_state;
int vm_running;
Notifier migration_state;
uint64_t pending_bytes;
uint32_t device_state;
int data_fd;
void *data_buffer;
size_t data_buffer_size;
} VFIOMigration;
typedef struct VFIOAddressSpace {
@ -218,6 +218,8 @@ typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList;
extern VFIOGroupList vfio_group_list;
bool vfio_mig_active(void);
int vfio_block_multiple_devices_migration(Error **errp);
void vfio_unblock_multiple_devices_migration(void);
int64_t vfio_mig_bytes_transferred(void);
#ifdef CONFIG_LINUX

29
include/standard-headers/drm/drm_fourcc.h
View File

@ -743,6 +743,35 @@ extern "C" {
*/
#define DRM_FORMAT_MOD_VIVANTE_SPLIT_SUPER_TILED fourcc_mod_code(VIVANTE, 4)
/*
* Vivante TS (tile-status) buffer modifiers. They can be combined with all of
* the color buffer tiling modifiers defined above. When TS is present it's a
* separate buffer containing the clear/compression status of each tile. The
* modifiers are defined as VIVANTE_MOD_TS_c_s, where c is the color buffer
* tile size in bytes covered by one entry in the status buffer and s is the
* number of status bits per entry.
* We reserve the top 8 bits of the Vivante modifier space for tile status
* clear/compression modifiers, as future cores might add some more TS layout
* variations.
*/
#define VIVANTE_MOD_TS_64_4 (1ULL << 48)
#define VIVANTE_MOD_TS_64_2 (2ULL << 48)
#define VIVANTE_MOD_TS_128_4 (3ULL << 48)
#define VIVANTE_MOD_TS_256_4 (4ULL << 48)
#define VIVANTE_MOD_TS_MASK (0xfULL << 48)
/*
* Vivante compression modifiers. Those depend on a TS modifier being present
* as the TS bits get reinterpreted as compression tags instead of simple
* clear markers when compression is enabled.
*/
#define VIVANTE_MOD_COMP_DEC400 (1ULL << 52)
#define VIVANTE_MOD_COMP_MASK (0xfULL << 52)
/* Masking out the extension bits will yield the base modifier. */
#define VIVANTE_MOD_EXT_MASK (VIVANTE_MOD_TS_MASK | \
VIVANTE_MOD_COMP_MASK)
/* NVIDIA frame buffer modifiers */
/*

18
include/standard-headers/linux/ethtool.h
View File

@ -159,8 +159,10 @@ static inline uint32_t ethtool_cmd_speed(const struct ethtool_cmd *ep)
* in its bus driver structure (e.g. pci_driver::name). Must
* not be an empty string.
* @version: Driver version string; may be an empty string
* @fw_version: Firmware version string; may be an empty string
* @erom_version: Expansion ROM version string; may be an empty string
* @fw_version: Firmware version string; driver defined; may be an
* empty string
* @erom_version: Expansion ROM version string; driver defined; may be
* an empty string
* @bus_info: Device bus address. This should match the dev_name()
* string for the underlying bus device, if there is one. May be
* an empty string.
@ -179,10 +181,6 @@ static inline uint32_t ethtool_cmd_speed(const struct ethtool_cmd *ep)
*
* Users can use the %ETHTOOL_GSSET_INFO command to get the number of
* strings in any string set (from Linux 2.6.34).
*
* Drivers should set at most @driver, @version, @fw_version and
* @bus_info in their get_drvinfo() implementation. The ethtool
* core fills in the other fields using other driver operations.
*/
struct ethtool_drvinfo {
uint32_t cmd;
@ -1737,6 +1735,13 @@ enum ethtool_link_mode_bit_indices {
ETHTOOL_LINK_MODE_100baseFX_Half_BIT = 90,
ETHTOOL_LINK_MODE_100baseFX_Full_BIT = 91,
ETHTOOL_LINK_MODE_10baseT1L_Full_BIT = 92,
ETHTOOL_LINK_MODE_800000baseCR8_Full_BIT = 93,
ETHTOOL_LINK_MODE_800000baseKR8_Full_BIT = 94,
ETHTOOL_LINK_MODE_800000baseDR8_Full_BIT = 95,
ETHTOOL_LINK_MODE_800000baseDR8_2_Full_BIT = 96,
ETHTOOL_LINK_MODE_800000baseSR8_Full_BIT = 97,
ETHTOOL_LINK_MODE_800000baseVR8_Full_BIT = 98,
/* must be last entry */
__ETHTOOL_LINK_MODE_MASK_NBITS
};
@ -1848,6 +1853,7 @@ enum ethtool_link_mode_bit_indices {
#define SPEED_100000 100000
#define SPEED_200000 200000
#define SPEED_400000 400000
#define SPEED_800000 800000
#define SPEED_UNKNOWN -1

16
include/standard-headers/linux/fuse.h
View File

@ -197,6 +197,10 @@
*
* 7.37
* - add FUSE_TMPFILE
*
* 7.38
* - add FUSE_EXPIRE_ONLY flag to fuse_notify_inval_entry
* - add FOPEN_PARALLEL_DIRECT_WRITES
*/
#ifndef _LINUX_FUSE_H
@ -228,7 +232,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 37
#define FUSE_KERNEL_MINOR_VERSION 38
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@ -300,6 +304,7 @@ struct fuse_file_lock {
* FOPEN_CACHE_DIR: allow caching this directory
* FOPEN_STREAM: the file is stream-like (no file position at all)
* FOPEN_NOFLUSH: don't flush data cache on close (unless FUSE_WRITEBACK_CACHE)
* FOPEN_PARALLEL_DIRECT_WRITES: Allow concurrent direct writes on the same inode
*/
#define FOPEN_DIRECT_IO (1 << 0)
#define FOPEN_KEEP_CACHE (1 << 1)
@ -307,6 +312,7 @@ struct fuse_file_lock {
#define FOPEN_CACHE_DIR (1 << 3)
#define FOPEN_STREAM (1 << 4)
#define FOPEN_NOFLUSH (1 << 5)
#define FOPEN_PARALLEL_DIRECT_WRITES (1 << 6)
/**
* INIT request/reply flags
@ -487,6 +493,12 @@ struct fuse_file_lock {
*/
#define FUSE_SETXATTR_ACL_KILL_SGID (1 << 0)
/**
* notify_inval_entry flags
* FUSE_EXPIRE_ONLY
*/
#define FUSE_EXPIRE_ONLY (1 << 0)
enum fuse_opcode {
FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */
@ -915,7 +927,7 @@ struct fuse_notify_inval_inode_out {
struct fuse_notify_inval_entry_out {
uint64_t parent;
uint32_t namelen;
uint32_t padding;
uint32_t flags;
};
struct fuse_notify_delete_out {

3
include/standard-headers/linux/input-event-codes.h
View File

@ -614,6 +614,9 @@
#define KEY_KBD_LAYOUT_NEXT 0x248 /* AC Next Keyboard Layout Select */
#define KEY_EMOJI_PICKER 0x249 /* Show/hide emoji picker (HUTRR101) */
#define KEY_DICTATE 0x24a /* Start or Stop Voice Dictation Session (HUTRR99) */
#define KEY_CAMERA_ACCESS_ENABLE 0x24b /* Enables programmatic access to camera devices. (HUTRR72) */
#define KEY_CAMERA_ACCESS_DISABLE 0x24c /* Disables programmatic access to camera devices. (HUTRR72) */
#define KEY_CAMERA_ACCESS_TOGGLE 0x24d /* Toggles the current state of the camera access control. (HUTRR72) */
#define KEY_BRIGHTNESS_MIN 0x250 /* Set Brightness to Minimum */
#define KEY_BRIGHTNESS_MAX 0x251 /* Set Brightness to Maximum */

2
include/standard-headers/linux/pci_regs.h
View File

@ -1058,6 +1058,7 @@
/* Precision Time Measurement */
#define PCI_PTM_CAP 0x04 /* PTM Capability */
#define PCI_PTM_CAP_REQ 0x00000001 /* Requester capable */
#define PCI_PTM_CAP_RES 0x00000002 /* Responder capable */
#define PCI_PTM_CAP_ROOT 0x00000004 /* Root capable */
#define PCI_PTM_GRANULARITY_MASK 0x0000FF00 /* Clock granularity */
#define PCI_PTM_CTRL 0x08 /* PTM Control */
@ -1119,6 +1120,7 @@
#define PCI_DOE_STATUS_DATA_OBJECT_READY 0x80000000 /* Data Object Ready */
#define PCI_DOE_WRITE 0x10 /* DOE Write Data Mailbox Register */
#define PCI_DOE_READ 0x14 /* DOE Read Data Mailbox Register */
#define PCI_DOE_CAP_SIZEOF 0x18 /* Size of DOE register block */
/* DOE Data Object - note not actually registers */
#define PCI_DOE_DATA_OBJECT_HEADER_1_VID 0x0000ffff

8
include/standard-headers/linux/virtio_bt.h
View File

@ -9,6 +9,7 @@
#define VIRTIO_BT_F_VND_HCI 0 /* Indicates vendor command support */
#define VIRTIO_BT_F_MSFT_EXT 1 /* Indicates MSFT vendor support */
#define VIRTIO_BT_F_AOSP_EXT 2 /* Indicates AOSP vendor support */
#define VIRTIO_BT_F_CONFIG_V2 3 /* Use second version configuration */
enum virtio_bt_config_type {
VIRTIO_BT_CONFIG_TYPE_PRIMARY = 0,
@ -28,4 +29,11 @@ struct virtio_bt_config {
uint16_t msft_opcode;
} QEMU_PACKED;
struct virtio_bt_config_v2 {
uint8_t type;
uint8_t alignment;
uint16_t vendor;
uint16_t msft_opcode;
};
#endif /* _LINUX_VIRTIO_BT_H */

4
include/standard-headers/linux/virtio_net.h
View File

@ -57,6 +57,9 @@
* Steering */
#define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
#define VIRTIO_NET_F_NOTF_COAL 53 /* Device supports notifications coalescing */
#define VIRTIO_NET_F_GUEST_USO4 54 /* Guest can handle USOv4 in. */
#define VIRTIO_NET_F_GUEST_USO6 55 /* Guest can handle USOv6 in. */
#define VIRTIO_NET_F_HOST_USO 56 /* Host can handle USO in. */
#define VIRTIO_NET_F_HASH_REPORT 57 /* Supports hash report */
#define VIRTIO_NET_F_RSS 60 /* Supports RSS RX steering */
#define VIRTIO_NET_F_RSC_EXT 61 /* extended coalescing info */
@ -130,6 +133,7 @@ struct virtio_net_hdr_v1 {
#define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
#define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
#define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
#define VIRTIO_NET_HDR_GSO_UDP_L4 5 /* GSO frame, IPv4& IPv6 UDP (USO) */
#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
uint8_t gso_type;
__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */

1
linux-headers/asm-arm64/kvm.h
View File

@ -43,6 +43,7 @@
#define __KVM_HAVE_VCPU_EVENTS
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#define KVM_DIRTY_LOG_PAGE_OFFSET 64
#define KVM_REG_SIZE(id) \
(1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))

3
linux-headers/asm-riscv/kvm.h
View File

@ -49,6 +49,9 @@ struct kvm_sregs {
struct kvm_riscv_config {
unsigned long isa;
unsigned long zicbom_block_size;
unsigned long mvendorid;
unsigned long marchid;
unsigned long mimpid;
};
/* CORE registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */

11
linux-headers/asm-x86/kvm.h
View File

@ -53,14 +53,6 @@
/* Architectural interrupt line count. */
#define KVM_NR_INTERRUPTS 256
struct kvm_memory_alias {
__u32 slot; /* this has a different namespace than memory slots */
__u32 flags;
__u64 guest_phys_addr;
__u64 memory_size;
__u64 target_phys_addr;
};
/* for KVM_GET_IRQCHIP and KVM_SET_IRQCHIP */
struct kvm_pic_state {
__u8 last_irr; /* edge detection */
@ -214,6 +206,8 @@ struct kvm_msr_list {
struct kvm_msr_filter_range {
#define KVM_MSR_FILTER_READ (1 << 0)
#define KVM_MSR_FILTER_WRITE (1 << 1)
#define KVM_MSR_FILTER_RANGE_VALID_MASK (KVM_MSR_FILTER_READ | \
KVM_MSR_FILTER_WRITE)
__u32 flags;
__u32 nmsrs; /* number of msrs in bitmap */
__u32 base; /* MSR index the bitmap starts at */
@ -224,6 +218,7 @@ struct kvm_msr_filter_range {
struct kvm_msr_filter {
#define KVM_MSR_FILTER_DEFAULT_ALLOW (0 << 0)
#define KVM_MSR_FILTER_DEFAULT_DENY (1 << 0)
#define KVM_MSR_FILTER_VALID_MASK (KVM_MSR_FILTER_DEFAULT_DENY)
__u32 flags;
struct kvm_msr_filter_range ranges[KVM_MSR_FILTER_MAX_RANGES];
};

34
linux-headers/linux/kvm.h
View File

@ -86,14 +86,6 @@ struct kvm_debug_guest {
/* *** End of deprecated interfaces *** */
/* for KVM_CREATE_MEMORY_REGION */
struct kvm_memory_region {
__u32 slot;
__u32 flags;
__u64 guest_phys_addr;
__u64 memory_size; /* bytes */
};
/* for KVM_SET_USER_MEMORY_REGION */
struct kvm_userspace_memory_region {
__u32 slot;
@ -104,9 +96,9 @@ struct kvm_userspace_memory_region {
};
/*
* The bit 0 ~ bit 15 of kvm_memory_region::flags are visible for userspace,
* other bits are reserved for kvm internal use which are defined in
* include/linux/kvm_host.h.
* The bit 0 ~ bit 15 of kvm_userspace_memory_region::flags are visible for
* userspace, other bits are reserved for kvm internal use which are defined
* in include/linux/kvm_host.h.
*/
#define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0)
#define KVM_MEM_READONLY (1UL << 1)
@ -483,6 +475,9 @@ struct kvm_run {
#define KVM_MSR_EXIT_REASON_INVAL (1 << 0)
#define KVM_MSR_EXIT_REASON_UNKNOWN (1 << 1)
#define KVM_MSR_EXIT_REASON_FILTER (1 << 2)
#define KVM_MSR_EXIT_REASON_VALID_MASK (KVM_MSR_EXIT_REASON_INVAL | \
KVM_MSR_EXIT_REASON_UNKNOWN | \
KVM_MSR_EXIT_REASON_FILTER)
__u32 reason; /* kernel -> user */
__u32 index; /* kernel -> user */
__u64 data; /* kernel <-> user */
@ -1176,6 +1171,8 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_S390_ZPCI_OP 221
#define KVM_CAP_S390_CPU_TOPOLOGY 222
#define KVM_CAP_DIRTY_LOG_RING_ACQ_REL 223
#define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 224
#define KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP 225
#ifdef KVM_CAP_IRQ_ROUTING
@ -1265,6 +1262,7 @@ struct kvm_x86_mce {
#define KVM_XEN_HVM_CONFIG_RUNSTATE (1 << 3)
#define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4)
#define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5)
#define KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG (1 << 6)
struct kvm_xen_hvm_config {
__u32 flags;
@ -1435,18 +1433,12 @@ struct kvm_vfio_spapr_tce {
__s32 tablefd;
};
/*
* ioctls for VM fds
*/
#define KVM_SET_MEMORY_REGION _IOW(KVMIO, 0x40, struct kvm_memory_region)
/*
* KVM_CREATE_VCPU receives as a parameter the vcpu slot, and returns
* a vcpu fd.
*/
#define KVM_CREATE_VCPU _IO(KVMIO, 0x41)
#define KVM_GET_DIRTY_LOG _IOW(KVMIO, 0x42, struct kvm_dirty_log)
/* KVM_SET_MEMORY_ALIAS is obsolete: */
#define KVM_SET_MEMORY_ALIAS _IOW(KVMIO, 0x43, struct kvm_memory_alias)
#define KVM_SET_NR_MMU_PAGES _IO(KVMIO, 0x44)
#define KVM_GET_NR_MMU_PAGES _IO(KVMIO, 0x45)
#define KVM_SET_USER_MEMORY_REGION _IOW(KVMIO, 0x46, \
@ -1738,6 +1730,8 @@ enum pv_cmd_id {
KVM_PV_UNSHARE_ALL,
KVM_PV_INFO,
KVM_PV_DUMP,
KVM_PV_ASYNC_CLEANUP_PREPARE,
KVM_PV_ASYNC_CLEANUP_PERFORM,
};
struct kvm_pv_cmd {
@ -1768,8 +1762,10 @@ struct kvm_xen_hvm_attr {
union {
__u8 long_mode;
__u8 vector;
__u8 runstate_update_flag;
struct {
__u64 gfn;
#define KVM_XEN_INVALID_GFN ((__u64)-1)
} shared_info;
struct {
__u32 send_port;
@ -1801,6 +1797,7 @@ struct kvm_xen_hvm_attr {
} u;
};
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_SHARED_INFO */
#define KVM_XEN_ATTR_TYPE_LONG_MODE 0x0
#define KVM_XEN_ATTR_TYPE_SHARED_INFO 0x1
@ -1808,6 +1805,8 @@ struct kvm_xen_hvm_attr {
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_EVTCHN_SEND */
#define KVM_XEN_ATTR_TYPE_EVTCHN 0x3
#define KVM_XEN_ATTR_TYPE_XEN_VERSION 0x4
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG */
#define KVM_XEN_ATTR_TYPE_RUNSTATE_UPDATE_FLAG 0x5
/* Per-vCPU Xen attributes */
#define KVM_XEN_VCPU_GET_ATTR _IOWR(KVMIO, 0xca, struct kvm_xen_vcpu_attr)
@ -1824,6 +1823,7 @@ struct kvm_xen_vcpu_attr {
__u16 pad[3];
union {
__u64 gpa;
#define KVM_XEN_INVALID_GPA ((__u64)-1)
__u64 pad[8];
struct {
__u64 state;

4
linux-headers/linux/psci.h
View File

@ -58,7 +58,7 @@
#define PSCI_1_1_FN_SYSTEM_RESET2 PSCI_0_2_FN(18)
#define PSCI_1_1_FN_MEM_PROTECT PSCI_0_2_FN(19)
#define PSCI_1_1_FN_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN(19)
#define PSCI_1_1_FN_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN(20)
#define PSCI_1_0_FN64_CPU_DEFAULT_SUSPEND PSCI_0_2_FN64(12)
#define PSCI_1_0_FN64_NODE_HW_STATE PSCI_0_2_FN64(13)
@ -67,7 +67,7 @@
#define PSCI_1_0_FN64_STAT_COUNT PSCI_0_2_FN64(17)
#define PSCI_1_1_FN64_SYSTEM_RESET2 PSCI_0_2_FN64(18)
#define PSCI_1_1_FN64_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN64(19)
#define PSCI_1_1_FN64_MEM_PROTECT_CHECK_RANGE PSCI_0_2_FN64(20)
/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff

138
linux-headers/linux/vfio.h
View File

@ -819,12 +819,20 @@ struct vfio_device_feature {
* VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P means that RUNNING_P2P
* is supported in addition to the STOP_COPY states.
*
* VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_PRE_COPY means that
* PRE_COPY is supported in addition to the STOP_COPY states.
*
* VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P | VFIO_MIGRATION_PRE_COPY
* means that RUNNING_P2P, PRE_COPY and PRE_COPY_P2P are supported
* in addition to the STOP_COPY states.
*
* Other combinations of flags have behavior to be defined in the future.
*/
struct vfio_device_feature_migration {
__aligned_u64 flags;
#define VFIO_MIGRATION_STOP_COPY (1 << 0)
#define VFIO_MIGRATION_P2P (1 << 1)
#define VFIO_MIGRATION_PRE_COPY (1 << 2)
};
#define VFIO_DEVICE_FEATURE_MIGRATION 1
@ -875,8 +883,13 @@ struct vfio_device_feature_mig_state {
* RESUMING - The device is stopped and is loading a new internal state
* ERROR - The device has failed and must be reset
*
* And 1 optional state to support VFIO_MIGRATION_P2P:
* And optional states to support VFIO_MIGRATION_P2P:
* RUNNING_P2P - RUNNING, except the device cannot do peer to peer DMA
* And VFIO_MIGRATION_PRE_COPY:
* PRE_COPY - The device is running normally but tracking internal state
* changes
* And VFIO_MIGRATION_P2P | VFIO_MIGRATION_PRE_COPY:
* PRE_COPY_P2P - PRE_COPY, except the device cannot do peer to peer DMA
*
* The FSM takes actions on the arcs between FSM states. The driver implements
* the following behavior for the FSM arcs:
@ -908,20 +921,48 @@ struct vfio_device_feature_mig_state {
*
* To abort a RESUMING session the device must be reset.
*
* PRE_COPY -> RUNNING
* RUNNING_P2P -> RUNNING
* While in RUNNING the device is fully operational, the device may generate
* interrupts, DMA, respond to MMIO, all vfio device regions are functional,
* and the device may advance its internal state.
*
* The PRE_COPY arc will terminate a data transfer session.
*
* PRE_COPY_P2P -> RUNNING_P2P
* RUNNING -> RUNNING_P2P
* STOP -> RUNNING_P2P
* While in RUNNING_P2P the device is partially running in the P2P quiescent
* state defined below.
*
* STOP -> STOP_COPY
* This arc begin the process of saving the device state and will return a
* new data_fd.
* The PRE_COPY_P2P arc will terminate a data transfer session.
*
* RUNNING -> PRE_COPY
* RUNNING_P2P -> PRE_COPY_P2P
* STOP -> STOP_COPY
* PRE_COPY, PRE_COPY_P2P and STOP_COPY form the "saving group" of states
* which share a data transfer session. Moving between these states alters
* what is streamed in session, but does not terminate or otherwise affect
* the associated fd.
*
* These arcs begin the process of saving the device state and will return a
* new data_fd. The migration driver may perform actions such as enabling
* dirty logging of device state when entering PRE_COPY or PER_COPY_P2P.
*
* Each arc does not change the device operation, the device remains
* RUNNING, P2P quiesced or in STOP. The STOP_COPY state is described below
* in PRE_COPY_P2P -> STOP_COPY.
*
* PRE_COPY -> PRE_COPY_P2P
* Entering PRE_COPY_P2P continues all the behaviors of PRE_COPY above.
* However, while in the PRE_COPY_P2P state, the device is partially running
* in the P2P quiescent state defined below, like RUNNING_P2P.
*
* PRE_COPY_P2P -> PRE_COPY
* This arc allows returning the device to a full RUNNING behavior while
* continuing all the behaviors of PRE_COPY.
*
* PRE_COPY_P2P -> STOP_COPY
* While in the STOP_COPY state the device has the same behavior as STOP
* with the addition that the data transfers session continues to stream the
* migration state. End of stream on the FD indicates the entire device
@ -939,6 +980,13 @@ struct vfio_device_feature_mig_state {
* device state for this arc if required to prepare the device to receive the
* migration data.
*
* STOP_COPY -> PRE_COPY
* STOP_COPY -> PRE_COPY_P2P
* These arcs are not permitted and return error if requested. Future
* revisions of this API may define behaviors for these arcs, in this case
* support will be discoverable by a new flag in
* VFIO_DEVICE_FEATURE_MIGRATION.
*
* any -> ERROR
* ERROR cannot be specified as a device state, however any transition request
* can be failed with an errno return and may then move the device_state into
@ -950,7 +998,7 @@ struct vfio_device_feature_mig_state {
* The optional peer to peer (P2P) quiescent state is intended to be a quiescent
* state for the device for the purposes of managing multiple devices within a
* user context where peer-to-peer DMA between devices may be active. The
* RUNNING_P2P states must prevent the device from initiating
* RUNNING_P2P and PRE_COPY_P2P states must prevent the device from initiating
* any new P2P DMA transactions. If the device can identify P2P transactions
* then it can stop only P2P DMA, otherwise it must stop all DMA. The migration
* driver must complete any such outstanding operations prior to completing the
@ -963,6 +1011,8 @@ struct vfio_device_feature_mig_state {
* above FSM arcs. As there are multiple paths through the FSM arcs the path
* should be selected based on the following rules:
* - Select the shortest path.
* - The path cannot have saving group states as interior arcs, only
* starting/end states.
* Refer to vfio_mig_get_next_state() for the result of the algorithm.
*
* The automatic transit through the FSM arcs that make up the combination
@ -976,6 +1026,9 @@ struct vfio_device_feature_mig_state {
* support them. The user can discover if these states are supported by using
* VFIO_DEVICE_FEATURE_MIGRATION. By using combination transitions the user can
* avoid knowing about these optional states if the kernel driver supports them.
*
* Arcs touching PRE_COPY and PRE_COPY_P2P are removed if support for PRE_COPY
* is not present.
*/
enum vfio_device_mig_state {
VFIO_DEVICE_STATE_ERROR = 0,
@ -984,8 +1037,70 @@ enum vfio_device_mig_state {
VFIO_DEVICE_STATE_STOP_COPY = 3,
VFIO_DEVICE_STATE_RESUMING = 4,
VFIO_DEVICE_STATE_RUNNING_P2P = 5,
VFIO_DEVICE_STATE_PRE_COPY = 6,
VFIO_DEVICE_STATE_PRE_COPY_P2P = 7,
};
/**
* VFIO_MIG_GET_PRECOPY_INFO - _IO(VFIO_TYPE, VFIO_BASE + 21)
*
* This ioctl is used on the migration data FD in the precopy phase of the
* migration data transfer. It returns an estimate of the current data sizes
* remaining to be transferred. It allows the user to judge when it is
* appropriate to leave PRE_COPY for STOP_COPY.
*
* This ioctl is valid only in PRE_COPY states and kernel driver should
* return -EINVAL from any other migration state.
*
* The vfio_precopy_info data structure returned by this ioctl provides
* estimates of data available from the device during the PRE_COPY states.
* This estimate is split into two categories, initial_bytes and
* dirty_bytes.
*
* The initial_bytes field indicates the amount of initial precopy
* data available from the device. This field should have a non-zero initial
* value and decrease as migration data is read from the device.
* It is recommended to leave PRE_COPY for STOP_COPY only after this field
* reaches zero. Leaving PRE_COPY earlier might make things slower.
*
* The dirty_bytes field tracks device state changes relative to data
* previously retrieved. This field starts at zero and may increase as
* the internal device state is modified or decrease as that modified
* state is read from the device.
*
* Userspace may use the combination of these fields to estimate the
* potential data size available during the PRE_COPY phases, as well as
* trends relative to the rate the device is dirtying its internal
* state, but these fields are not required to have any bearing relative
* to the data size available during the STOP_COPY phase.
*
* Drivers have a lot of flexibility in when and what they transfer during the
* PRE_COPY phase, and how they report this from VFIO_MIG_GET_PRECOPY_INFO.
*
* During pre-copy the migration data FD has a temporary "end of stream" that is
* reached when both initial_bytes and dirty_byte are zero. For instance, this
* may indicate that the device is idle and not currently dirtying any internal
* state. When read() is done on this temporary end of stream the kernel driver
* should return ENOMSG from read(). Userspace can wait for more data (which may
* never come) by using poll.
*
* Once in STOP_COPY the migration data FD has a permanent end of stream
* signaled in the usual way by read() always returning 0 and poll always
* returning readable. ENOMSG may not be returned in STOP_COPY.
* Support for this ioctl is mandatory if a driver claims to support
* VFIO_MIGRATION_PRE_COPY.
*
* Return: 0 on success, -1 and errno set on failure.
*/
struct vfio_precopy_info {
__u32 argsz;
__u32 flags;
__aligned_u64 initial_bytes;
__aligned_u64 dirty_bytes;
};
#define VFIO_MIG_GET_PRECOPY_INFO _IO(VFIO_TYPE, VFIO_BASE + 21)
/*
* Upon VFIO_DEVICE_FEATURE_SET, allow the device to be moved into a low power
* state with the platform-based power management. Device use of lower power
@ -1128,6 +1243,19 @@ struct vfio_device_feature_dma_logging_report {
#define VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT 8
/*
* Upon VFIO_DEVICE_FEATURE_GET read back the estimated data length that will
* be required to complete stop copy.
*
* Note: Can be called on each device state.
*/
struct vfio_device_feature_mig_data_size {
__aligned_u64 stop_copy_length;
};
#define VFIO_DEVICE_FEATURE_MIG_DATA_SIZE 9
/* -------- API for Type1 VFIO IOMMU -------- */
/**