On 6/3/2025 8:09 AM, Duan, Zhenzhong wrote:
-----Original Message-----
From: Steve Sistare <steven.sist...@oracle.com>
Subject: [PATCH V4 00/43] Live update: vfio and iommufd
Support vfio and iommufd devices with the cpr-transfer live migration mode.
Devices that do not support live migration can still support cpr-transfer,
allowing live update to a new version of QEMU on the same host, with no loss
of guest connectivity.
Just curious. My understanding is: for device not supporting live migration,
device
will not be stopped during cpr-transfer and there is no device state
saving/restore.
Yes.
But for device supporting live migration, it will be stopped and device state
is saved
in source and restored in destination, it that right?
As currently written, yes.
However, it may be faster and more reliable if I disable savevm_vfio_handlers
and the
associated notifiers during CPR, and only use the CPR mechanism for preserving
the device.
- Steve
