This series RFC patches give a sample about how to enable the live migration
on vfio mdev deivce with the new introduced vfio interface and vfio device
status region.
In order to fulfill the migration requirement we add the following
modifications to the mdev device driver.
1. Add the guest to host graphics address adjustment when guest
try to access gma through mmio or graphics commands, so after
migraiton the guest view of graphics address will remain the same.
2. Add handler for VFIO new ioctls to contorl the device stop/start and
fetch the dirty page bitmap from device model.
3. Implement the function to save/retore the device context, which
is accessed through VFIO new region VFIO_PCI_DEVICE_STATE_REGION_INDEX
to transfer device status during the migration.
Yulei Zhang (9):
drm/i915/gvt: Apply g2h adjust for GTT mmio access
drm/i915/gvt: Apply g2h adjustment during fence mmio access
drm/i915/gvt: Adjust the gma parameter in gpu commands during command
parser
drm/i915/gvt: Retrieve the guest gm base address from PVINFO
drm/i915/gvt: Align the guest gm aperture start offset for live
migration
drm/i915/gvt: Introduce new flag to indicate migration capability
drm/i915/gvt: Introduce new VFIO ioctl for device status control
drm/i915/gvt: Introduce new VFIO ioctl for mdev device dirty page sync
drm/i915/gvt: Add support to VFIO region
VFIO_PCI_DEVICE_STATE_REGION_INDEX
drivers/gpu/drm/i915/gvt/Makefile | 2 +-
drivers/gpu/drm/i915/gvt/aperture_gm.c | 6 +-
drivers/gpu/drm/i915/gvt/cfg_space.c | 3 +-
drivers/gpu/drm/i915/gvt/cmd_parser.c | 26 +-
drivers/gpu/drm/i915/gvt/gtt.c | 19 +-
drivers/gpu/drm/i915/gvt/gvt.c | 1 +
drivers/gpu/drm/i915/gvt/gvt.h | 41 +-
drivers/gpu/drm/i915/gvt/kvmgt.c | 65 ++-
drivers/gpu/drm/i915/gvt/migrate.c | 715 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/gvt/migrate.h | 82 ++++
drivers/gpu/drm/i915/gvt/mmio.c | 14 +
drivers/gpu/drm/i915/gvt/mmio.h | 1 +
drivers/gpu/drm/i915/gvt/vgpu.c | 8 +-
include/uapi/linux/vfio.h | 33 +-
14 files changed, 984 insertions(+), 32 deletions(-)
create mode 100644 drivers/gpu/drm/i915/gvt/migrate.c
create mode 100644 drivers/gpu/drm/i915/gvt/migrate.h
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2.7.4
