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Re: [PATCH v3 01/11] xen/manage: keep track of the on-going suspend mode

On 5/28/21 5:50 PM, Anchal Agarwal wrote:

> That only fails during boot but not after the control jumps into the image. 
> The
> non boot cpus are brought offline(freeze_secondary_cpus) and then online via 
> cpu hotplug path. In that case xen_vcpu_setup doesn't invokes the hypercall 
> again.

OK, that makes sense --- by that time VCPUs have already been registered. What 
I don't understand though is why resume doesn't fail every time --- xen_vcpu 
and xen_vcpu_info should be different practically always, shouldn't they? Do 
you observe successful resumes when the hypercall fails?

> Another line of thought is something what kexec does to come around this 
> problem
> is to abuse soft_reset and issue it during syscore_resume or may be before 
> the image get loaded.
> I haven't experimented with that yet as I am assuming there has to be a way 
> to re-register vcpus during resume.

Right, that sounds like it should work.




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