linux-kernel - Re: [RFC PATCH V2 4/5] vhost: introduce helpers to get the size of metadata area

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Message-ID: <035c74bb-71eb-71db-f5f5-ed9d1a12d733@redhat.com>
Date:   Thu, 7 Mar 2019 10:42:50 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, peterx@...hat.com,
        Linux-MM <linux-mm@...ck.org>, aarcange@...hat.com
Subject: Re: [RFC PATCH V2 4/5] vhost: introduce helpers to get the size of
 metadata area


On 2019/3/7 上午2:43, Souptick Joarder wrote:
> On Wed, Mar 6, 2019 at 12:48 PM Jason Wang <jasowang@...hat.com> wrote:
>> Signed-off-by: Jason Wang <jasowang@...hat.com>
> Is the change log left with any particular reason ?


Nope, will add the log.

Thanks


>> ---
>>   drivers/vhost/vhost.c | 46 ++++++++++++++++++++++++++++------------------
>>   1 file changed, 28 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
>> index 2025543..1015464 100644
>> --- a/drivers/vhost/vhost.c
>> +++ b/drivers/vhost/vhost.c
>> @@ -413,6 +413,27 @@ static void vhost_dev_free_iovecs(struct vhost_dev *dev)
>>                  vhost_vq_free_iovecs(dev->vqs[i]);
>>   }
>>
>> +static size_t vhost_get_avail_size(struct vhost_virtqueue *vq, int num)
>> +{
>> +       size_t event = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
>> +
>> +       return sizeof(*vq->avail) +
>> +              sizeof(*vq->avail->ring) * num + event;
>> +}
>> +
>> +static size_t vhost_get_used_size(struct vhost_virtqueue *vq, int num)
>> +{
>> +       size_t event = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
>> +
>> +       return sizeof(*vq->used) +
>> +              sizeof(*vq->used->ring) * num + event;
>> +}
>> +
>> +static size_t vhost_get_desc_size(struct vhost_virtqueue *vq, int num)
>> +{
>> +       return sizeof(*vq->desc) * num;
>> +}
>> +
>>   void vhost_dev_init(struct vhost_dev *dev,
>>                      struct vhost_virtqueue **vqs, int nvqs, int iov_limit)
>>   {
>> @@ -1253,13 +1274,9 @@ static bool vq_access_ok(struct vhost_virtqueue *vq, unsigned int num,
>>                           struct vring_used __user *used)
>>
>>   {
>> -       size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
>> -
>> -       return access_ok(desc, num * sizeof *desc) &&
>> -              access_ok(avail,
>> -                        sizeof *avail + num * sizeof *avail->ring + s) &&
>> -              access_ok(used,
>> -                       sizeof *used + num * sizeof *used->ring + s);
>> +       return access_ok(desc, vhost_get_desc_size(vq, num)) &&
>> +              access_ok(avail, vhost_get_avail_size(vq, num)) &&
>> +              access_ok(used, vhost_get_used_size(vq, num));
>>   }
>>
>>   static void vhost_vq_meta_update(struct vhost_virtqueue *vq,
>> @@ -1311,22 +1328,18 @@ static bool iotlb_access_ok(struct vhost_virtqueue *vq,
>>
>>   int vq_meta_prefetch(struct vhost_virtqueue *vq)
>>   {
>> -       size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
>>          unsigned int num = vq->num;
>>
>>          if (!vq->iotlb)
>>                  return 1;
>>
>>          return iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->desc,
>> -                              num * sizeof(*vq->desc), VHOST_ADDR_DESC) &&
>> +                              vhost_get_desc_size(vq, num), VHOST_ADDR_DESC) &&
>>                 iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->avail,
>> -                              sizeof *vq->avail +
>> -                              num * sizeof(*vq->avail->ring) + s,
>> +                              vhost_get_avail_size(vq, num),
>>                                 VHOST_ADDR_AVAIL) &&
>>                 iotlb_access_ok(vq, VHOST_ACCESS_WO, (u64)(uintptr_t)vq->used,
>> -                              sizeof *vq->used +
>> -                              num * sizeof(*vq->used->ring) + s,
>> -                              VHOST_ADDR_USED);
>> +                              vhost_get_used_size(vq, num), VHOST_ADDR_USED);
>>   }
>>   EXPORT_SYMBOL_GPL(vq_meta_prefetch);
>>
>> @@ -1343,13 +1356,10 @@ bool vhost_log_access_ok(struct vhost_dev *dev)
>>   static bool vq_log_access_ok(struct vhost_virtqueue *vq,
>>                               void __user *log_base)
>>   {
>> -       size_t s = vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
>> -
>>          return vq_memory_access_ok(log_base, vq->umem,
>>                                     vhost_has_feature(vq, VHOST_F_LOG_ALL)) &&
>>                  (!vq->log_used || log_access_ok(log_base, vq->log_addr,
>> -                                       sizeof *vq->used +
>> -                                       vq->num * sizeof *vq->used->ring + s));
>> +                                 vhost_get_used_size(vq, vq->num)));
>>   }
>>
>>   /* Can we start vq? */
>> --
>> 1.8.3.1
>>