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Re: [Xen-devel] [PATCH 5/5] xen: add new hypercall to get grant table limits

>>> On 25.08.17 at 13:40, <jgross@xxxxxxxx> wrote:
> So what about the following idea:
> - Set the default max number of grant frames to 32 on "small" hosts
>   (max. physical memory address below 16TB) and to 64 on "large"
>   hosts

This looks reasonable to me as long as it's properly documented.

> - Add a per-domain parameter for the max number of grant frames
> In the Linux kernel I would then:
> - Re-add grant v2 support
> - Add boot parameter for selecting grant v1 or v2
> - Use grant v2 if selected via boot parameter, or (pv only:) max. host
>   address is above 16TB

Can a PV DomU know? Plus can you easily switch between
versions after having been migrated? And wouldn't HVM or ARM
guests need to judge by max guest address?


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