Re: PVH VCPU hotplug support v7?

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 31/07/17 14:55, Boris Ostrovsky wrote:
> On 07/31/2017 09:20 AM, Ross Lagerwall wrote:
>> Hi Boris,
>>
>> I've modified your PVH VCPU hotplug support v6 patch series [1] to
>> support HVM guests running _with_ a device model for XenServer's
>> purposes. This is useful because it moves the vCPU hotplug handling
>> out of QEMU and allows it to mostly be shared with PVH. It will also
>> allow unplugging vCPUs (libxl currently only does cpu-add for upstream
>> qemu).
>>
>> Are you still planning on continuing with that patch series since your
>> commit to Linux [2]?
> This series has been put on hold until we figure out what to do with
> hotplug for PVH dom0. (The problem was the "dual" view by dom0 of APCI
> CPU namespace --- on hotplug event dom0 has to somehow figure out
> whether the event was due to (dis)appearance of a physical or virtual CPU).
>
> I don't think this has been dealt with yet (copying Roger).

From the point of view of unblocking several pieces of work, it would be
fine for this logic to be behind an emulation flag, just like LAPIC/etc.

~Andrew

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