linux-kernel - Re: [PATCH V5 4/4] kvm: add a check if pfn is from NVDIMM pmem.

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Message-ID: <159bb198-a4a1-0fee-bf57-24c3c28788bd@redhat.com>
Date:   Fri, 21 Sep 2018 21:29:00 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     KVM list <kvm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Zhang, Yu C" <yu.c.zhang@...el.com>,
        Pankaj Gupta <pagupta@...hat.com>, Jan Kara <jack@...e.cz>,
        Christoph Hellwig <hch@....de>, Linux MM <linux-mm@...ck.org>,
        rkrcmar@...hat.com,
        Jérôme Glisse <jglisse@...hat.com>,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>
Subject: Re: [PATCH V5 4/4] kvm: add a check if pfn is from NVDIMM pmem.

On 21/09/2018 20:17, Dan Williams wrote:
> On Fri, Sep 21, 2018 at 7:24 AM David Hildenbrand <david@...hat.com> wrote:
> [..]
>>> Remove the PageReserved flag sounds more reasonable.
>>> And Could we still have a flag to identify it is a device private memory, or
>>> where these pages coming from?
>>
>> We could use a page type for that or what you proposed. (as I said, we
>> might have to change hibernation code to skip the pages once we drop the
>> reserved flag).
> 
> I think it would be reasonable to reject all ZONE_DEVICE pages in
> saveable_page().
> 

Indeed, that sounds like the easiest solution - guess that answer was
too easy for me to figure out :) .

-- 

Thanks,

David / dhildenb