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8/6/25 11:58 AM, Peter Xu wrote: > On Tue, Jul 22, 2025 at 12:41:22PM +0000, Jonah Palmer wrote: >> Adds a new migration capability 'virtio-iterative' that will allow >> virtio devices, where supported, to iteratively migrate configuration >> changes that occur during the migration process. >> >> This capability is added to the validated capabilities list to ensure >> both the source and destination support it before enabling. >> >> The capability defaults to off to maintain backward compatibility. >> >> To enable the capability via HMP: >> (qemu) migrate_set_capability virtio-iterative on >> >> To enable the capability via QMP: >> {"execute": "migrate-set-capabilities", "arguments": { >> "capabilities": [ >> { "capability": "virtio-iterative", "state": true } >> ] >> } >> } >> >> Signed-off-by: Jonah Palmer >> --- >> migration/savevm.c | 1 + >> qapi/migration.json | 7 ++++++- >> 2 files changed, 7 insertions(+), 1 deletion(-) >> >> diff --git a/migration/savevm.c b/migration/savevm.c >> index bb04a4520d..40a2189866 100644 >> --- a/migration/savevm.c >> +++ b/migration/savevm.c >> @@ -279,6 +279,7 @@ static bool should_validate_capability(int capability) >> switch (capability) { >> case MIGRATION_CAPABILITY_X_IGNORE_SHARED: >> case MIGRATION_CAPABILITY_MAPPED_RAM: >> + case MIGRATION_CAPABILITY_VIRTIO_ITERATIVE: >> return true; >> default: >> return false; >> diff --git a/qapi/migration.json b/qapi/migration.json >> index 4963f6ca12..8f042c3ba5 100644 >> --- a/qapi/migration.json >> +++ b/qapi/migration.json >> @@ -479,6 +479,11 @@ >> # each RAM page. Requires a migration URI that supports seeking, >> # such as a file. (since 9.0) >> # >> +# @virtio-iterative: Enable iterative migration for virtio devices, if >> +# the device supports it. When enabled, and where supported, virtio >> +# devices will track and migrate configuration changes that may >> +# occur during the migration process. (Since 10.1) >> +# > > Having a migration capability to enable iterative support for a specific > type of device sounds wrong. > > If virtio will be able to support iterative saves, it could provide the > save_live_iterate() function. Any explanation why it needs to be a > migration capability? > It certainly doesn't have to be a migration capability. Perhaps it's better as a per-device compatibility property? E.g.: -device virtio-net-pci,x-iterative-migration=on,... I was just thinking along the lines of not having this feature enabled by default for backwards-compatibility (and something to toggle to compare performance during development). Totally open to suggestions though. I wasn't really sure how best a feature/capability like this should be introduced. >> # Features: >> # >> # @unstable: Members @x-colo and @x-ignore-shared are experimental. >> @@ -498,7 +503,7 @@ >> { 'name': 'x-ignore-shared', 'features': [ 'unstable' ] }, >> 'validate-uuid', 'background-snapshot', >> 'zero-copy-send', 'postcopy-preempt', 'switchover-ack', >> - 'dirty-limit', 'mapped-ram'] } >> + 'dirty-limit', 'mapped-ram', 'virtio-iterative'] } >> >> ## >> # @MigrationCapabilityStatus: >> -- >> 2.47.1 >> >