[Xen-devel] Ping: [PATCH v2 RESEND] x86/time: correctly honor late clearing of TSC related feature flags

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.12.16 at 11:51, <JBeulich@xxxxxxxx> wrote:
> As such clearing of flags may have an impact on the selected rendezvous
> function, handle such in a central place.
> 
> But don't allow such feature flags to be cleared during CPU hotplug:
> Platform and local system times may have diverged significantly by
> then, potentially causing noticably (even if only temporary) strange
> behavior. As we're anyway expecting only sufficiently similar CPUs to
> appear during hotplug, this shouldn't be introducing new limitations.
> 
> Reported-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> Tested-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
> Tested-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
> ---
> The resend is mainly to get the discussion going again on what the
> alternatives are, if this patch is not acceptable.

Even if you don't agree with the patch, can we at least revive
the discussion of what alternatives there are?

Jan


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