linux-kernel - Re: [PATCH v37 1/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE

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Date:   Fri, 28 Dec 2018 09:03:46 +0100
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Wei Wang <wei.w.wang@...el.com>, virtio-dev@...ts.oasis-open.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, mst@...hat.com, mhocko@...nel.org,
        akpm@...ux-foundation.org, dgilbert@...hat.com
Cc:     torvalds@...ux-foundation.org, pbonzini@...hat.com,
        liliang.opensource@...il.com, yang.zhang.wz@...il.com,
        quan.xu0@...il.com, nilal@...hat.com, riel@...hat.com,
        peterx@...hat.com, quintela@...hat.com,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>
Subject: Re: [PATCH v37 1/3] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT



On 28.12.2018 04:12, Wei Wang wrote:
> On 12/27/2018 08:03 PM, Christian Borntraeger wrote:
>> On 27.08.2018 03:32, Wei Wang wrote:
>>>   static int init_vqs(struct virtio_balloon *vb)
>>>   {
>>> -    struct virtqueue *vqs[3];
>>> -    vq_callback_t *callbacks[] = { balloon_ack, balloon_ack, stats_request };
>>> -    static const char * const names[] = { "inflate", "deflate", "stats" };
>>> -    int err, nvqs;
>>> +    struct virtqueue *vqs[VIRTIO_BALLOON_VQ_MAX];
>>> +    vq_callback_t *callbacks[VIRTIO_BALLOON_VQ_MAX];
>>> +    const char *names[VIRTIO_BALLOON_VQ_MAX];
>>> +    int err;
>>>
>>>       /*
>>> -     * We expect two virtqueues: inflate and deflate, and
>>> -     * optionally stat.
>>> +     * Inflateq and deflateq are used unconditionally. The names[]
>>> +     * will be NULL if the related feature is not enabled, which will
>>> +     * cause no allocation for the corresponding virtqueue in find_vqs.
>>>        */
>> This might be true for virtio-pci, but it is not for virtio-ccw.
> 
> Hi Christian,
> 
> 
> Please try the fix patches: https://lkml.org/lkml/2018/12/27/336

See answer to that thread. It fixes the random boot crashes.
There is still the regression that ballooning does no longer work on
s390 (see the call trace).