* Kirti Wankhede (kwankh...@nvidia.com) wrote: > Define flags to be used as delimeter in migration file stream. > Added .save_setup and .save_cleanup functions. Mapped & unmapped migration > region from these functions at source during saving or pre-copy phase. > Set VFIO device state depending on VM's state. During live migration, VM is > running when .save_setup is called, _SAVING | _RUNNING state is set for VFIO > device. During save-restore, VM is paused, _SAVING state is set for VFIO > device. > > Signed-off-by: Kirti Wankhede <kwankh...@nvidia.com> > Reviewed-by: Neo Jia <c...@nvidia.com> > --- > hw/vfio/migration.c | 73 > ++++++++++++++++++++++++++++++++++++++++++++++++++++ > hw/vfio/trace-events | 2 ++ > 2 files changed, 75 insertions(+) > > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c > index c2f5564b51c3..773c8d16b1c1 100644 > --- a/hw/vfio/migration.c > +++ b/hw/vfio/migration.c > @@ -8,12 +8,14 @@ > */ > > #include "qemu/osdep.h" > +#include "qemu/main-loop.h" > #include <linux/vfio.h> > > #include "sysemu/runstate.h" > #include "hw/vfio/vfio-common.h" > #include "cpu.h" > #include "migration/migration.h" > +#include "migration/vmstate.h" > #include "migration/qemu-file.h" > #include "migration/register.h" > #include "migration/blocker.h" > @@ -24,6 +26,17 @@ > #include "pci.h" > #include "trace.h" > > +/* > + * Flags used as delimiter: > + * 0xffffffff => MSB 32-bit all 1s > + * 0xef10 => emulated (virtual) function IO > + * 0x0000 => 16-bits reserved for flags > + */ > +#define VFIO_MIG_FLAG_END_OF_STATE (0xffffffffef100001ULL) > +#define VFIO_MIG_FLAG_DEV_CONFIG_STATE (0xffffffffef100002ULL) > +#define VFIO_MIG_FLAG_DEV_SETUP_STATE (0xffffffffef100003ULL) > +#define VFIO_MIG_FLAG_DEV_DATA_STATE (0xffffffffef100004ULL) > + > static void vfio_migration_region_exit(VFIODevice *vbasedev) > { > VFIOMigration *migration = vbasedev->migration; > @@ -126,6 +139,64 @@ static int vfio_migration_set_state(VFIODevice > *vbasedev, uint32_t mask, > return 0; > } > > +/* ---------------------------------------------------------------------- */ > + > +static int vfio_save_setup(QEMUFile *f, void *opaque) > +{ > + VFIODevice *vbasedev = opaque; > + VFIOMigration *migration = vbasedev->migration; > + int ret; > + > + trace_vfio_save_setup(vbasedev->name); > + > + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE); > + > + if (migration->region.mmaps) { > + 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 %d: %s", > + vbasedev->name, migration->region.index, > + strerror(-ret)); > + return ret; > + } > + } > + > + ret = vfio_migration_set_state(vbasedev, ~0, VFIO_DEVICE_STATE_SAVING); > + if (ret) { > + error_report("%s: Failed to set state SAVING", vbasedev->name); > + return ret; > + } > + > + qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE); > + > + ret = qemu_file_get_error(f); > + if (ret) { > + return ret; > + } > + > + return 0; > +} > + > +static void vfio_save_cleanup(void *opaque) > +{ > + VFIODevice *vbasedev = opaque; > + VFIOMigration *migration = vbasedev->migration; > + > + if (migration->region.mmaps) { > + vfio_region_unmap(&migration->region); > + } > + trace_vfio_save_cleanup(vbasedev->name); > +} > + > +static SaveVMHandlers savevm_vfio_handlers = { > + .save_setup = vfio_save_setup, > + .save_cleanup = vfio_save_cleanup, > +}; > + > +/* ---------------------------------------------------------------------- */ > + > static void vfio_vmstate_change(void *opaque, int running, RunState state) > { > VFIODevice *vbasedev = opaque; > @@ -192,6 +263,8 @@ static int vfio_migration_init(VFIODevice *vbasedev, > return ret; > } > > + register_savevm_live("vfio", VMSTATE_INSTANCE_ID_ANY, 1, > + &savevm_vfio_handlers, vbasedev);
I see you changed the -1 to VMSTATE_INSTANCE_ID_ANY which is soemthing I'd asked for in my review last month of v16. But I also asked what happens with multiple devices and whether this was working OK because I was worried about using the fixed name and multiple instances of a register_savevm_live being rare. Did you check that out? Dave > vbasedev->vm_state = > qemu_add_vm_change_state_handler(vfio_vmstate_change, > vbasedev); > > diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events > index bd3d47b005cb..86c18def016e 100644 > --- a/hw/vfio/trace-events > +++ b/hw/vfio/trace-events > @@ -149,3 +149,5 @@ 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)" > -- > 2.7.0 > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK