Re: [PATCH v3 08/13] KVM: xen: prevent vcpu_id from changing whilst shared_info is valid

[David Woodhouse]

On Mon, 2023-09-18 at 14:41 +0000, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@xxxxxxxxxx>
> 
> To further prepare for automatically using the vcpu_info structures
> embedded in the shared_info page, we need to ensure that the Xen vcpu_id
> cannot change under our feet. We can do this by simply returning -EBUSY
> to any attempt to modify the attribute while the shinfo_cache is active.
> 
> Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>

Makes sense. Wants explicitly mentioning in the documentation for
KVM_XEN_VCPU_ATTR_TYPE_VCPU_ID. If/when you did that,

Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>

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