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Date: Thu, 7 Mar 2019 00:13:24 +0530 From: Souptick Joarder <jrdr.linux@...il.com> To: Jason Wang <jasowang@...hat.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 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 ? > --- > 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 >
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