Re: [Xen-devel] [PATCH 6/7] x86/viridian: make the threshold for HvNotifyLongSpinWait tunable

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 17/03/17 09:57, Paul Durrant wrote:
> The current threshold before the guest issues the hypercall is, and always
> has been, hard-coded to 2047. It is not clear where this number came
> from so, to at least allow for ease of experimentation, this patch makes
> the threshold tunable via the Xen command line.
>
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

This is one example of a configuration option which I'd prefer to see
done with the (planned) new CPUID interface.

The value here doesn't have any impact on the hypervisor, so a
configuration option is free to be chosen entirely by the toolstack, and
would also become inherently per-domain configuration rather than global.

Can I talk you into deferring this change until the CPUID interface is
sorted, to avoid introducing yet another command line option?

~Andrew

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