[Virtio-fs] [PATCH v3 1/1] vhost-user-fs: add migration type property

[Anton Kuchin]

On 01/03/2023 22:22, Michael S. Tsirkin wrote:
> On Wed, Mar 01, 2023 at 09:35:56PM +0200, Anton Kuchin wrote:
>> I do trust them :)
>> I have to, otherwise we would need to pack all the properties and
>> flags of qemu to the migration stream and validate them at
>> destination or entire migration ends up broken beyond repair if
>> orchestrators tend to do stupid things and need babysitting.
> This is not at all a crazy idea. It has some disadvantages
> too esp around cross version migration, which is why we
> don't do this yet.
>

Indeed. I know VMMs that chose this path. But as long as
qemu decided to trust orchestrators I think we'd better
keep this consistent across the codebase.

Only ivshmem_pre_load callback bothers to check device
property and virtio_net_tx_waiting_pre_load checks that
number of queue pairs doesn't exceed allowed maximum, all
other *_pre_load functions generally just initialize some
parts of state that need to be set before stream starts
loading.