Re: [Xen-devel] [PATCH RFC 2/2] xen/x86: Introduce XEN_SYSCTL_cpuid hypercall

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.02.14 at 13:11, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> Apart from forcibly messing with a balanced numa setup, what about cpu
> pools, or toolstack disaggregation where pinning is restricted?

There no messing with a balanced setup here - everything should
of course be transient, i.e. get restored to previous values right
after. And I can't see a reason not to permit the hardware domain
to temporarily escape its enclave, as it can do worse to the overall
system anyway.

The new hypercall is simple enough (yet very x86-centric) that I'm
not really against it; what I'm against is adding functionality to the
hypervisor that is already available by other means.

Jan


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