Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram

[Michael S. Tsirkin]

On Thu, Feb 01, 2018 at 02:31:32PM -0200, Eduardo Habkost wrote:
> On Thu, Feb 01, 2018 at 04:24:30PM +0200, Michael S. Tsirkin wrote:
> [...]
> > The full fix would be to allow QEMU to map a list of
> > pages to a guest supplied IOVA.
> 
> Thanks, that's what I expected.
> 
> While this is not possible, the only requests I have for this
> patch is that we clearly document:
> * What's the only purpose of share=on on a host-memory-backend
>   object (due to pvrdma limitations).
> * The potential undesirable side-effects of setting share=on.
> * On the commit message and other comments, clearly distinguish
>   HVAs in the QEMU address-space from IOVAs, to avoid confusion.

Looking forward, when we do support it, how will management find out
it no longer needs to pass the share parameter?

Further, if the side effects of the share parameter go away,
how will it know these no longer hold?

> -- 
> Eduardo