On 5/12/22 16:43, Avihai Horon wrote:
> Replace the current VFIO migration protocol v1 implementation with a new
> implementation corresponding to VFIO migration protocol v2.
>
> The main changes are:
> - VFIO device state is now represented as a finite state machine instead
> of a bitmap.
>
> - Migration interface with kernel is now done using VFIO_DEVICE_FEATURE
> ioctl and normal read() and write() instead of the migration region.
>
> - As VFIO migration protocol v2 currently doesn't support the pre-copy
> phase of migration, .save_live_pending and .save_live_iterate handlers
> plus pre-copy relevant code are removed.
>
> Detailed information about VFIO migration protocol v2 and difference
> compared to v1 can be found here [1].
>
> [1]
> https://lore.kernel.org/all/[email protected]/
>
> Signed-off-by: Avihai Horon <[email protected]>
> ---
> hw/vfio/common.c | 21 +-
> hw/vfio/migration.c | 628 +++++++---------------------------
> hw/vfio/trace-events | 9 +-
> include/hw/vfio/vfio-common.h | 8 +-
> 4 files changed, 153 insertions(+), 513 deletions(-)
>
This looks like a fairly big patch, though more than 70% of it is removing
code. Perhaps you could split it into adding v2 and removing v1 afterwards,
rather
than a single replacement patch? It's just a suggestion anyhow, to hopefully
ease
analysis of the new additions. The removal looks to muddle a tiny bit.
I don't wanna throw you into potentially unnecessary work should maintainers
disagree,
so here's an attempt:
https://github.com/jpemartins/qemu/commits/for-avihai
If you apply your series on top of the same base commit (78ac2eebbab9) you
should be able
to compare both branches.
I haven't found yet any particular flaws in your new logic (but will reply back
if I find
any).
