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Re: [Xen-devel] struct shared_info extensibility (or lack thereof)
| To: | Rik van Riel <riel@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] struct shared_info extensibility (or lack thereof) |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 28 Nov 2005 17:20:19 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 28 Nov 2005 17:14:39 +0000 |
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On 28 Nov 2005, at 16:47, Rik van Riel wrote: The reason for putting the vcpu_* structures together on a per virtual cpu basis is that this way we can extend the number of virtual CPUs in the future, without breaking the interface with older guests. The current stared_info struct of two [MAX_VIRT_CPUS] arrays followed by the single variables is just impossible to extend in the future. MAX_VIRT_CPUS is already quite big (32). Increasing it to the next power-of-two will overflow the shared_info page. So, if/when we want to do that we'll place the extra vcpu info in a separate shared page. Given how close 3.0.0 is now, I don't think this is a good change to be making. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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