Re: [Xen-devel] [PATCH] vcpu-set increases vcpus beyond the value set at domain creation

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 15 Feb 2006, at 23:04, Ryan Grimm wrote:

> This patch allows a domain's vcpus to increase beyond the max (up to
> CONFIG_NR_CPUS) set at creation time by making 3 changes:
I'd prefer to keep the current Xen mechanisms, but extend xend and/or 
config file formats so that we can distinguish max_vcpus from 
initial_vcpus. Currently the two values are conflated. Then you can set 
max_vcpus as high as you like, but xenstore will tell the guest how 
many CPUs to bring up during boot.
If we want a 'hard limit' check in Xen (kind of like we have a 
per-domain memory limit) to ensure that guests do not sneakily bring up 
CPUs that we didn't ask them to, then we can add that but it's an 
orthogonal change (i.e., different patch) to what you are trying to do 
here.
 -- Keir


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