From: Peter Xu <peterx@redhat.com>
To: Avihai Horon <avihaih@nvidia.com>
Cc: qemu-devel@nongnu.org, "Alex Williamson" <alex@shazbot.org>,
"Cédric Le Goater" <clg@redhat.com>,
"Fabiano Rosas" <farosas@suse.de>,
"Pierrick Bouvier" <pierrick.bouvier@oss.qualcomm.com>,
"Philippe Mathieu-Daudé" <philmd@linaro.org>,
"Zhao Liu" <zhao1.liu@intel.com>,
"Halil Pasic" <pasic@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Jason Herne" <jjherne@linux.ibm.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Ilya Leoshkevich" <iii@linux.ibm.com>,
"David Hildenbrand" <david@kernel.org>,
"Eric Farman" <farman@linux.ibm.com>,
"Matthew Rosato" <mjrosato@linux.ibm.com>,
"Cornelia Huck" <cohuck@redhat.com>,
"Eric Blake" <eblake@redhat.com>,
"Vladimir Sementsov-Ogievskiy" <vsementsov@yandex-team.ru>,
"John Snow" <jsnow@redhat.com>,
"Markus Armbruster" <armbru@redhat.com>,
"Maor Gottlieb" <maorg@nvidia.com>
Subject: Re: [PATCH v2 11/13] vfio/migration: Implement VFIO_PRECOPY_INFO_REINIT feature
Date: Wed, 3 Jun 2026 16:49:36 -0400 [thread overview]
Message-ID: <aiCTYBDbpx_og9Ug@x1.local> (raw)
In-Reply-To: <20260602092621.382-12-avihaih@nvidia.com>
On Tue, Jun 02, 2026 at 12:26:19PM +0300, Avihai Horon wrote:
> According to VFIO uAPI, precopy initial_bytes is considered as critical
> data that should be transferred and loaded prior to moving to STOP_COPY
> state to ensure precopy phase would be effective.
>
> As currently defined, initial_bytes can only decrease as it's being read
> from the data fd. However, there are cases where a new chunk of
> initial_bytes should be transferred during precopy.
>
> The new VFIO_PRECOPY_INFO_REINIT feature addresses this and allows
> reporting a new value for initial_bytes regardless of any previously
> reported values.
>
> Implement VFIO_PRECOPY_INFO_REINIT feature:
> 1. Opt-in for VFIO_DEVICE_FEATURE_MIG_PRECOPY_INFOv2 to make
> VFIO_PRECOPY_INFO_REINIT available.
> 2. Request a new switchover ACK if initial_bytes increases post of a
> previous switchover ACK. This ensures the device is not moved to
> STOP_COPY before initial_bytes has reached zero again.
>
> Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Acked-by: Peter Xu <peterx@redhat.com>
--
Peter Xu
next prev parent reply other threads:[~2026-06-03 20:50 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-02 9:26 [PATCH v2 00/13] Make switchover-ack re-usable and add VFIO precopy REINIT feature Avihai Horon
2026-06-02 9:26 ` [PATCH v2 01/13] migration: Propagate errors in migration_completion_precopy() Avihai Horon
2026-06-03 19:47 ` Peter Xu
2026-06-04 15:12 ` Avihai Horon
2026-06-04 15:21 ` Peter Xu
2026-06-04 15:38 ` Avihai Horon
2026-06-02 9:26 ` [PATCH v2 02/13] migration: Run final save_query_pending at switchover Avihai Horon
2026-06-03 20:05 ` Peter Xu
2026-06-03 21:04 ` Peter Xu
2026-06-04 15:29 ` Avihai Horon
2026-06-04 17:18 ` Peter Xu
2026-06-08 12:07 ` Avihai Horon
2026-06-08 14:11 ` Peter Xu
2026-06-08 14:32 ` Avihai Horon
2026-06-02 9:26 ` [PATCH v2 03/13] migration: Log the approver in qemu_loadvm_approve_switchover() Avihai Horon
2026-06-02 9:26 ` [PATCH v2 04/13] migration: Replace switchover_ack_needed SaveVMHandler Avihai Horon
2026-06-02 9:26 ` [PATCH v2 05/13] migration: Rename switchover-ack code to legacy Avihai Horon
2026-06-03 20:21 ` Peter Xu
2026-06-02 9:26 ` [PATCH v2 06/13] migration: Make switchover-ack re-usable Avihai Horon
2026-06-03 7:17 ` Markus Armbruster
2026-06-04 15:05 ` Avihai Horon
2026-06-08 10:23 ` Markus Armbruster
2026-06-02 9:26 ` [PATCH v2 07/13] migration: Fail migration if switchover-ack is requested after switchover decision Avihai Horon
2026-06-03 20:42 ` Peter Xu
2026-06-04 15:36 ` Avihai Horon
2026-06-04 17:48 ` Peter Xu
2026-06-08 12:49 ` Avihai Horon
2026-06-02 9:26 ` [PATCH v2 08/13] vfio/migration: Extract VFIO_MIG_FLAG_DEV_INIT_DATA_SENT sending to helper Avihai Horon
2026-06-03 20:43 ` Peter Xu
2026-06-02 9:26 ` [PATCH v2 09/13] vfio/migration: Add Error ** parameter to vfio_migration_init() Avihai Horon
2026-06-03 11:38 ` Philippe Mathieu-Daudé
2026-06-04 15:06 ` Avihai Horon
2026-06-02 9:26 ` [PATCH v2 10/13] vfio/migration: Add new switchover-ack mechanism Avihai Horon
2026-06-03 20:47 ` Peter Xu
2026-06-02 9:26 ` [PATCH v2 11/13] vfio/migration: Implement VFIO_PRECOPY_INFO_REINIT feature Avihai Horon
2026-06-03 20:49 ` Peter Xu [this message]
2026-06-02 9:26 ` [PATCH v2 12/13] vfio/migration: Check VFIO_PRECOPY_INFO_REINIT during switchover Avihai Horon
2026-06-02 9:26 ` [PATCH v2 13/13] migration: Enable new switchover-ack Avihai Horon
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