Re: [PATCH v4 for-next 1/2] RDMA/core: Provide rdma_user_mmap_disassociate() to disassociate mmap pages

[Jason Gunthorpe]

On Wed, Sep 11, 2024 at 08:38:35PM +0800, Junxian Huang wrote:

> Once hns device is reset, we don't allow any doorbell until driver's
> re-initialization is completed. Not only all existing mmaps on ucontexts
> will be zapped, no more new mmaps are allowed either.
> 
> This actually makes ucontexts unavailable since userspace cannot access
> HW with them any more. Users will have to destroy the old ucontext and
> allocate a new one after driver's re-initialization is completed.

It is supposed to come back once the reset is completed, yes userspace
may need to restart some objects but the ucontext shouldn't be left
crippled.

Jason