Re: [PATCH v2 0/2] mm: Memory offlining + page isolation cleanups

[David Hildenbrand]

On 22.10.19 10:21, Michal Hocko wrote:
> On Tue 22-10-19 10:15:07, David Hildenbrand wrote:
>> On 22.10.19 10:08, Michal Hocko wrote:
>>> On Tue 22-10-19 08:52:28, David Hildenbrand wrote:
>>>> On 21.10.19 19:23, David Hildenbrand wrote:
>>>>> Two cleanups that popped up while working on (and discussing) virtio-mem:
>>>>>     https://lkml.org/lkml/2019/9/19/463
>>>>>
>>>>> Tested with DIMMs on x86.
>>>>>
>>>>> As discussed with michal in v1, I'll soon look into removing the use
>>>>> of PG_reserved during memory onlining completely - most probably
>>>>> disallowing to offline memory blocks with holes, cleaning up the
>>>>> onlining+offlining code.
>>>>
>>>> BTW, I remember that ZONE_DEVICE pages are still required to be set
>>>> PG_reserved. That has to be sorted out first.
>>>
>>> Do they?
>>
>> Yes, especially KVM code :/
> 
> Details please?
> 


E.g., arch/x86/kvm/mmu.c:kvm_is_mmio_pfn()

And I currently have