Commit 4ec3ed5b authored by Changpeng Liu's avatar Changpeng Liu Committed by Jim Harris
Browse files

nvmf/vfio-user: add migration region mmio registers 



The miration region data structure is from `vfio_device_migration_info`
defined in `linux/vfio.h`, `vfio_device_migration_info` is in the 0th
offset of the VFIO_REGION_SUBTYPE_MIGRATION region, and in vfio-user,
we reserve first one page of BAR9 for this MMIO accesses.

libvfio-user already helps us to hide some implementation details
based on vfio migration specification, here we just use the two
fields to help the migration process.

Change-Id: I8917ba892bbfdfdf4f135f5d6b4923ab0e4a6250
Signed-off-by: default avatarChangpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7628


Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Tested-by: default avatarSPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: default avatarBen Walker <benjamin.walker@intel.com>
Reviewed-by: default avatarJim Harris <james.r.harris@intel.com>
parent a3c55229

lib/nvmf/vfio_user.c

+8 −0
Original line number Diff line number Diff line
@@ -251,6 +251,12 @@ enum nvmf_vfio_user_ctrlr_state { 
	VFIO_USER_CTRLR_MIGRATING

};



/* Migration region to record NVMe device state data structure */

struct vfio_user_migration_region {

	uint64_t last_data_offset;

	uint64_t pending_bytes;

};



struct nvmf_vfio_user_sq {

	struct spdk_nvmf_qpair			qpair;

	struct spdk_nvmf_transport_poll_group	*group;
@@ -293,6 +299,8 @@ struct nvmf_vfio_user_ctrlr { 
	TAILQ_HEAD(, nvmf_vfio_user_sq)		connected_sqs;

	enum nvmf_vfio_user_ctrlr_state		state;



	struct vfio_user_migration_region	migr_reg;



	struct spdk_thread			*thread;

	struct spdk_poller			*vfu_ctx_poller;