linux-kernel - Re: [PATCH v4 6/6] virtio-balloon: Add support for providing unused page reports to host

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Date:   Mon, 12 Aug 2019 17:49:56 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Alexander Duyck <alexander.duyck@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Nitesh Narayan Lal <nitesh@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yang Zhang <yang.zhang.wz@...il.com>, pagupta@...hat.com,
        Rik van Riel <riel@...riel.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Matthew Wilcox <willy@...radead.org>, lcapitulino@...hat.com,
        wei.w.wang@...el.com, Andrea Arcangeli <aarcange@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>, dan.j.williams@...el.com,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v4 6/6] virtio-balloon: Add support for providing unused
 page reports to host

On 12.08.19 17:20, Alexander Duyck wrote:
> On Mon, Aug 12, 2019 at 2:53 AM Michael S. Tsirkin <mst@...hat.com> wrote:
>>
>> On Wed, Aug 07, 2019 at 03:42:19PM -0700, Alexander Duyck wrote:
>>> From: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
> 
> <snip>
> 
>>> --- a/include/uapi/linux/virtio_balloon.h
>>> +++ b/include/uapi/linux/virtio_balloon.h
>>> @@ -36,6 +36,7 @@
>>>  #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM      2 /* Deflate balloon on OOM */
>>>  #define VIRTIO_BALLOON_F_FREE_PAGE_HINT      3 /* VQ to report free pages */
>>>  #define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */
>>> +#define VIRTIO_BALLOON_F_REPORTING   5 /* Page reporting virtqueue */
>>>
>>>  /* Size of a PFN in the balloon interface. */
>>>  #define VIRTIO_BALLOON_PFN_SHIFT 12
>>
>> Just a small comment: same as any feature bit,
>> or indeed any host/guest interface changes, please
>> CC virtio-dev on any changes to this UAPI file.
>> We must maintain these in the central place in the spec,
>> otherwise we run a risk of conflicts.
>>
> 
> Okay, other than that if I resubmit with the virtio-dev list added to
> you thing this patch set is ready to be acked and pulled into either
> the virtio or mm tree assuming there is no other significant feedback
> that comes in?
> 

I want to take a detailed look at the mm bits (might take a bit but I
don't see a need to rush). I am fine with the page flag we are using.
Hope some other mm people (cc'ing Michal and Oscar) can have a look.

-- 

Thanks,

David / dhildenb