Messages in this thread | | | Subject | Re: [RFC PATCH V2 4/5] vhost: introduce helpers to get the size of metadata area | From | Jason Wang <> | Date | Thu, 7 Mar 2019 10:42:50 +0800 |
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On 2019/3/7 上午2:43, Souptick Joarder wrote: > On Wed, Mar 6, 2019 at 12:48 PM Jason Wang <jasowang@redhat.com> wrote: >> Signed-off-by: Jason Wang <jasowang@redhat.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 >>
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