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X-Received-From: 134.134.136.65 Subject: Re: [Qemu-devel] [PATCH v7 06/13] vfio: Add VM state change handler to know state of VM 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 05:49:13PM +0800, Kirti Wankhede wrote: > VM state change handler gets called on change in VM's state. This is used to set > VFIO device state to _RUNNING. > VM state change handler, migration state change handler and log_sync listener > are called asynchronously, which sometimes lead to data corruption in migration > region. Initialised mutex that is used to serialize operations on migration data > region during saving state. > > Signed-off-by: Kirti Wankhede > Reviewed-by: Neo Jia > --- > hw/vfio/migration.c | 64 +++++++++++++++++++++++++++++++++++++++++++ > hw/vfio/trace-events | 2 ++ > include/hw/vfio/vfio-common.h | 4 +++ > 3 files changed, 70 insertions(+) > > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c > index a2cfbd5af2e1..c01f08b659d0 100644 > --- a/hw/vfio/migration.c > +++ b/hw/vfio/migration.c > @@ -78,6 +78,60 @@ err: > return ret; > } > > +static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t state) > +{ > + VFIOMigration *migration = vbasedev->migration; > + VFIORegion *region = &migration->region.buffer; > + uint32_t device_state; > + int ret = 0; > + > + device_state = (state & VFIO_DEVICE_STATE_MASK) | > + (vbasedev->device_state & ~VFIO_DEVICE_STATE_MASK); > + > + if ((device_state & VFIO_DEVICE_STATE_MASK) == VFIO_DEVICE_STATE_INVALID) { > + return -EINVAL; > + } > + > + ret = pwrite(vbasedev->fd, &device_state, sizeof(device_state), > + region->fd_offset + offsetof(struct vfio_device_migration_info, > + device_state)); > + if (ret < 0) { > + error_report("%s: Failed to set device state %d %s", > + vbasedev->name, ret, strerror(errno)); > + return ret; > + } > + > + vbasedev->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; > + > + if ((vbasedev->vm_running != running)) { > + int ret; > + uint32_t dev_state; > + > + if (running) { > + dev_state = VFIO_DEVICE_STATE_RUNNING; should be dev_state |= VFIO_DEVICE_STATE_RUNNING; ? > + } else { > + dev_state = (vbasedev->device_state & VFIO_DEVICE_STATE_MASK) & > + ~VFIO_DEVICE_STATE_RUNNING; > + } > + > + ret = vfio_migration_set_state(vbasedev, dev_state); > + if (ret) { > + error_report("%s: Failed to set device state 0x%x", > + vbasedev->name, dev_state); > + } > + vbasedev->vm_running = running; > + trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state), > + dev_state); > + } > +} > + > static int vfio_migration_init(VFIODevice *vbasedev, > struct vfio_region_info *info) > { > @@ -93,6 +147,11 @@ static int vfio_migration_init(VFIODevice *vbasedev, > return ret; > } > > + qemu_mutex_init(&vbasedev->migration->lock); > + > + vbasedev->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change, > + vbasedev); > + > return 0; > } > > @@ -135,11 +194,16 @@ void vfio_migration_finalize(VFIODevice *vbasedev) > return; > } > > + if (vbasedev->vm_state) { > + qemu_del_vm_change_state_handler(vbasedev->vm_state); > + } > + > if (vbasedev->migration_blocker) { > migrate_del_blocker(vbasedev->migration_blocker); > error_free(vbasedev->migration_blocker); > } > > + qemu_mutex_destroy(&vbasedev->migration->lock); > vfio_migration_region_exit(vbasedev); > g_free(vbasedev->migration); > } > diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events > index 191a726a1312..3d15bacd031a 100644 > --- a/hw/vfio/trace-events > +++ b/hw/vfio/trace-events > @@ -146,3 +146,5 @@ vfio_display_edid_write_error(void) "" > > # migration.c > 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" > diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h > index 152da3f8d6f3..f6c70db3a9c1 100644 > --- a/include/hw/vfio/vfio-common.h > +++ b/include/hw/vfio/vfio-common.h > @@ -29,6 +29,7 @@ > #ifdef CONFIG_LINUX > #include > #endif > +#include "sysemu/sysemu.h" > > #define VFIO_MSG_PREFIX "vfio %s: " > > @@ -124,6 +125,9 @@ typedef struct VFIODevice { > unsigned int flags; > VFIOMigration *migration; > Error *migration_blocker; > + uint32_t device_state; > + VMChangeStateEntry *vm_state; > + int vm_running; > } VFIODevice; > > struct VFIODeviceOps { > -- > 2.7.0 >