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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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".

Jan



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