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

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Tue, Apr 16, 2013 at 10:09 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> Hey Jan,
>
> 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.

Except that we really don't want to be trashing people's existing,
working versions of Linux, especially if they're distro-provided
kernels.  I haven't tested a distro kernel yet, but for my own
locally-built 2.6.37 kernel, this c/s breaks it running in PVHVM mode.

 -George

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