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X-Received-From: 192.55.52.120 Subject: Re: [Qemu-devel] [PATCH v7 08/13] vfio: Register SaveVMHandlers for VFIO device X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Yan Zhao Cc: "Zhengxiao.zx@Alibaba-inc.com" , "Tian, Kevin" , "Liu, Yi L" , "cjia@nvidia.com" , "eskultet@redhat.com" , "Yang, Ziye" , "qemu-devel@nongnu.org" , "cohuck@redhat.com" , "shuangtai.tst@alibaba-inc.com" , "dgilbert@redhat.com" , "Wang, Zhi A" , "mlevitsk@redhat.com" , "pasic@linux.ibm.com" , "aik@ozlabs.ru" , "alex.williamson@redhat.com" , "eauger@redhat.com" , "felipe@nutanix.com" , "jonathan.davies@nutanix.com" , "Liu, Changpeng" , "Ken.Xue@amd.com" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Jul 09, 2019 at 05:49:15PM +0800, Kirti Wankhede 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 > Reviewed-by: Neo Jia > --- > hw/vfio/migration.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++- > hw/vfio/trace-events | 2 ++ > 2 files changed, 83 insertions(+), 1 deletion(-) > > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c > index e4a89a6f9bc7..0597a45fda2d 100644 > --- a/hw/vfio/migration.c > +++ b/hw/vfio/migration.c > @@ -23,6 +23,17 @@ > #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; > @@ -106,6 +117,74 @@ static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t state) > return 0; > } > > +/* ---------------------------------------------------------------------- */ > + > +static int vfio_save_setup(QEMUFile *f, void *opaque) > +{ > + VFIODevice *vbasedev = opaque; > + VFIOMigration *migration = vbasedev->migration; > + int ret; > + > + qemu_put_be64(f, VFIO_MIG_FLAG_DEV_SETUP_STATE); > + > + if (migration->region.buffer.mmaps) { > + qemu_mutex_lock_iothread(); > + ret = vfio_region_mmap(&migration->region.buffer); > + 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; > + } > + } > + > + if (vbasedev->vm_running) { > + ret = vfio_migration_set_state(vbasedev, > + VFIO_DEVICE_STATE_RUNNING | VFIO_DEVICE_STATE_SAVING); > + if (ret) { > + error_report("%s: Failed to set state RUNNING and SAVING", > + vbasedev->name); > + return ret; > + } > + } else { hi Kirti May I know in which condition will this "else" case happen? Thanks Yan > + ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_SAVING); > + if (ret) { > + error_report("%s: Failed to set state STOP and 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; > + } > + > + trace_vfio_save_setup(vbasedev->name); > + return 0; > +} > + > +static void vfio_save_cleanup(void *opaque) > +{ > + VFIODevice *vbasedev = opaque; > + VFIOMigration *migration = vbasedev->migration; > + > + if (migration->region.buffer.mmaps) { > + vfio_region_unmap(&migration->region.buffer); > + } > + 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; > @@ -195,7 +274,8 @@ static int vfio_migration_init(VFIODevice *vbasedev, > } > > qemu_mutex_init(&vbasedev->migration->lock); > - > + register_savevm_live(vbasedev->dev, "vfio", -1, 1, &savevm_vfio_handlers, > + vbasedev); > 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 69503228f20e..4bb43f18f315 100644 > --- a/hw/vfio/trace-events > +++ b/hw/vfio/trace-events > @@ -149,3 +149,5 @@ vfio_migration_probe(char *name, uint32_t index) " (%s) Region %d" > vfio_migration_set_state(char *name, uint32_t state) " (%s) state %d" > vfio_vmstate_change(char *name, int running, const char *reason, uint32_t dev_state) " (%s) running %d reason %s device state %d" > vfio_migration_state_notifier(char *name, int state) " (%s) state %d" > +vfio_save_setup(char *name) " (%s)" > +vfio_save_cleanup(char *name) " (%s)" > -- > 2.7.0 >