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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.04.13 at 17:31, George Dunlap <George.Dunlap@xxxxxxxxxxxxx> wrote:
> 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.

Hmm - that's minimally a reason to not backport it to 4.2, but
perhaps even a reason to revert it from staging.

Jan


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