linux-kernel - Re: [PATCH 3/3] kvm: add a function to check if page is from NVDIMM pmem.

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Date:   Wed, 4 Jul 2018 17:27:17 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Zhang Yi <yi.z.zhang@...ux.intel.com>
Cc:     KVM list <kvm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
        "Zhang, Yu C" <yu.c.zhang@...el.com>,
        Linux MM <linux-mm@...ck.org>, rkrcmar@...hat.com,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 3/3] kvm: add a function to check if page is from NVDIMM
 pmem.

On 04/07/2018 16:50, Dan Williams wrote:
>> +       return is_zone_device_page(page) &&
>> +               ((page->pgmap->type == MEMORY_DEVICE_FS_DAX) ||
>> +                (page->pgmap->type == MEMORY_DEVICE_DEV_DAX));
> Jerome, might there be any use case to pass MEMORY_DEVICE_PUBLIC
> memory to a guest vm?
> 

An even better reason to place this in mm.h. :)  There should be an
function to tell you if a reserved page has accessed/dirty bits etc.,
that's all that KVM needs to know.

Paolo