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vfio/migration: Change vIOMMU blocker from global to per device

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Contrary to multiple device blocker which needs to consider already-attached
devices to unblock/block dynamically, the vIOMMU migration blocker is a device
specific config. Meaning it only needs to know whether the device is bypassing
or not the vIOMMU (via machine property, or per pxb-pcie::bypass_iommu), and
does not need the state of currently present devices. For this reason, the
vIOMMU global migration blocker can be consolidated into the per-device
migration blocker, allowing us to remove some unnecessary code.

This change also makes vfio_mig_active() more accurate as it doesn't check for
global blocker.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Zhenzhong Duan 2023-07-03 15:15:07 +08:00 • committed by Cédric Le Goater
parent adee0da036
commit 3c26c80a0a
4 changed files with 7 additions and 55 deletions
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3
include/hw/vfio/vfio-common.h
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@ -227,7 +227,7 @@ extern VFIOGroupList vfio_group_list;
bool vfio_mig_active(void);
int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp);
void vfio_unblock_multiple_devices_migration(void);
int vfio_block_giommu_migration(VFIODevice *vbasedev, Error **errp);
bool vfio_viommu_preset(VFIODevice *vbasedev);
int64_t vfio_mig_bytes_transferred(void);
void vfio_reset_bytes_transferred(void);
@ -254,6 +254,5 @@ int vfio_spapr_remove_window(VFIOContainer *container,
int vfio_migration_realize(VFIODevice *vbasedev, Error **errp);
void vfio_migration_exit(VFIODevice *vbasedev);
void vfio_migration_finalize(void);
#endif /* HW_VFIO_VFIO_COMMON_H */