Re: [Qemu-devel] [PATCH V2 0/5] hw/pvrdma: PVRDMA device implementation

[Yuval Shaia]

> > 
> > > What happens if guest attempts to register all its memory?
> > > 
> > 
> > Then we loose, is not different from bare metal, reg_mr will pin all the 
> > RAM.
> 
> We need to find a way to communicate to guests about amount
> of memory they can pin.

dev_caps.max_mr_size is the way device limits guest driver.
This value is controlled by the command line argument dev-caps-max-mr-size
so we should be fine (btw, default value is 1<<32).

> 
> > However this is only one scenario, and hopefully not much used
> > for RoCE. (I know IPoIB does that, but it doesn't make sense to use it with 
> > RoCE).
> 
> SRP does it too AFAIK.
>