Re: [Xen-devel] [PATCH RFC for next] xen: make grant table configurable

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jan 18, 2019 at 12:48:42AM -0700, Jan Beulich wrote:
> >>> On 17.01.19 at 13:30, <wei.liu2@xxxxxxxxxx> wrote:
> > --- a/xen/common/Kconfig
> > +++ b/xen/common/Kconfig
> > @@ -11,6 +11,17 @@ config COMPAT
> >  config CORE_PARKING
> >     bool
> >  
> > +config GRANT_TABLE
> > +   bool "Grant table support"
> > +   default y
> > +   ---help---
> > +     Grant table provides a generic mechanism to memory sharing
> > +     between domains. This shared memory interface underpins the
> > +     split device drivers for block and network IO in a classic
> > +     Xen setup.
> 
> I can see reasons why one may want this (along the lines of SILO
> mode), but it'll produce an entirely ABI-incompatible hypervisor.
> Most front-/backend driver pairs won't work without it. I'm not
> sure the tool stack is prepared to act on such a hypervisor. I'm
> pretty sure at least XenoLinux derivatives BUG() upon error
> returns from certain gnttab hypercalls.
> 
> As such as well as to be within our general line of what Kconfig
> options we permit, I think for the time being the prompt needs
> to depend on EXPERT = "y".

Good point. I will do that.

Wei.

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