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. -boris
