diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/vfio/migration.c | 160 | ||||
| -rw-r--r-- | hw/vfio/trace-events | 2 |
2 files changed, 162 insertions, 0 deletions
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index fd7faf423c..e1ffae05e2 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -10,6 +10,7 @@ #include "qemu/osdep.h" #include <linux/vfio.h> +#include "sysemu/runstate.h" #include "hw/vfio/vfio-common.h" #include "cpu.h" #include "migration/migration.h" @@ -22,6 +23,157 @@ #include "exec/ram_addr.h" #include "pci.h" #include "trace.h" +#include "hw/hw.h" + +static inline int vfio_mig_access(VFIODevice *vbasedev, void *val, int count, + off_t off, bool iswrite) +{ + 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; + } + 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) +{ + 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; + int ret; + + ret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state), + dev_state_off); + if (ret < 0) { + 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 vfio_vmstate_change(void *opaque, int 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_RUNNING; + } else { + /* + * Here device state could be either _RUNNING or _SAVING|_RUNNING. Reset + * _RUNNING bit + */ + mask = ~VFIO_DEVICE_STATE_RUNNING; + 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_exit(VFIODevice *vbasedev) { @@ -38,6 +190,7 @@ static int vfio_migration_init(VFIODevice *vbasedev, { int ret; Object *obj; + VFIOMigration *migration; if (!vbasedev->ops->vfio_get_object) { return -EINVAL; @@ -64,6 +217,10 @@ static int vfio_migration_init(VFIODevice *vbasedev, ret = -EINVAL; goto err; } + + migration = vbasedev->migration; + migration->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change, + vbasedev); return 0; err: @@ -111,6 +268,9 @@ add_blocker: void vfio_migration_finalize(VFIODevice *vbasedev) { if (vbasedev->migration) { + VFIOMigration *migration = vbasedev->migration; + + qemu_del_vm_change_state_handler(migration->vm_state); vfio_migration_exit(vbasedev); } diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events index 9ced5ec627..41de81f12f 100644 --- a/hw/vfio/trace-events +++ b/hw/vfio/trace-events @@ -148,3 +148,5 @@ 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" |