[Qemu-devel] vhost-user: VHOST_SET_MEM_TABLE, VHOST_SET_VRING_CALL need a reply?

[Michael S. Tsirkin]

Reply-To: 

Thinking about the vhost-user protocol, VHOST_SET_MEM_TABLE
is used to update the memory mappings.

So shouldn't we want for response?
Otherwise e.g. guest can start using the memory
that vhost-user can't access.

Similarly, with an IOMMU vhost-user might access memory it shouldn't.

VHOST_SET_VRING_CALL is used for MSI-X masking.
Again, after vector is masted by switching the call fd,
backend shouldn't assert the old one.

Thoughts?