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Re: [Xen-devel] [PATCH 3/3] x86_64: allow more vCPU-s per guest
| To: | Jan Beulich <JBeulich@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 3/3] x86_64: allow more vCPU-s per guest |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Thu, 18 Jun 2009 10:16:43 +0100 |
| Cc: | |
| Delivery-date: | Thu, 18 Jun 2009 02:17:09 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH 3/3] x86_64: allow more vCPU-s per guest |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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