Re: [Xen-devel] [RFC] Re-introduce VCPUOP_register_vcpu_info back for PVHVM guests. (v1)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.04.13 at 23:09, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> While I've been digging around CPU hotplug for PVHVM I noticed an oddity
> when running with different versions of hypervisor. I found out that the
> big change you did in Xen 4.2 of splitting the PV and HVM arch structure
> introduce the regression wherein VCPUOP_register_vcpu_info will not
> work for PVHVM guests.
> 
> Interestingly enough if I introduce this back to the hypervisor the
> CPU hotplug path gets even more broken for PVHVM :-).. But that is a Linux
> problem.
> 
> But if it was not intentional, please see the patch and if you are 
> happy also please back-port it to Xen 4.2 stable branch.

Yes, I apparently overlooked that HVM is permitted to use
VCPUOP_register_vcpu_info.

Jan


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