Re: [Xen-devel] [PATCH 3/3] x86_64: allow more vCPU-s per guest

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 10/06/2009 15:48, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

> Since the shared info layout is fixed, guests are required to use
> VCPUOP_register_vcpu_info prior to booting any vCPU beyond the
> traditional limit of 32.

Applied. Is the vcpu[] array re-allocation in XEN_DOMCTL_max_vcpus an
example of over-optimistic-concurrency-control? It can't really be 100% safe
without extra locking on all users of that array (not good), or using rcu
(better), can it. The wmb() is a nice try. ;-)

 -- Keir



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