On 30/10/2024 15:36, Jason Gunthorpe wrote:
> On Wed, Oct 30, 2024 at 11:15:02PM +0800, Zhangfei Gao wrote:
>> hw/vfio/migration.c
>> if (vfio_viommu_preset(vbasedev)) {
>> error_setg(&err, "%s: Migration is currently not supported "
>> "with vIOMMU enabled", vbasedev->name);
>> goto add_blocker;
>> }
>
> The viommu driver itself does not support live migration, it would
> need to preserve all the guest configuration and bring it all back. It
> doesn't know how to do that yet.
It's more of vfio code, not quite related to actually hw vIOMMU.
There's some vfio migration + vIOMMU support patches I have to follow up (v5)
but unexpected set backs unrelated to work delay some of my plans for qemu 9.2.
I expect to resume in few weeks. I can point you to a branch while I don't
submit (provided soft-freeze is coming)
Joao
