From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [PATCH net-next V2 5/8] vhost: vhost_put_user() can accept metadata type Date: Mon, 16 Jul 2018 11:28:08 +0800 Message-ID: <1531711691-6769-6-git-send-email-jasowang__33224.469543393$1531711885$gmane$org@redhat.com> References: <1531711691-6769-1-git-send-email-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1531711691-6769-1-git-send-email-jasowang@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: mst@redhat.com, jasowang@redhat.com Cc: kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, maxime.coquelin@redhat.com, wexu@redhat.com List-Id: virtualization@lists.linuxfoundation.org We assumes used ring update is the only user for vhost_put_user() in the past. This may not be the case for the incoming packed ring which may update the descriptor ring for used. So introduce a new type parameter. Signed-off-by: Jason Wang --- drivers/vhost/vhost.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index af15bec..060a431 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -814,7 +814,7 @@ static inline void __user *__vhost_get_user(struct vhost_virtqueue *vq, return __vhost_get_user_slow(vq, addr, size, type); } -#define vhost_put_user(vq, x, ptr) \ +#define vhost_put_user(vq, x, ptr, type) \ ({ \ int ret = -EFAULT; \ if (!vq->iotlb) { \ @@ -822,7 +822,7 @@ static inline void __user *__vhost_get_user(struct vhost_virtqueue *vq, } else { \ __typeof__(ptr) to = \ (__typeof__(ptr)) __vhost_get_user(vq, ptr, \ - sizeof(*ptr), VHOST_ADDR_USED); \ + sizeof(*ptr), type); \ if (to != NULL) \ ret = __put_user(x, to); \ else \ @@ -1687,7 +1687,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq) { void __user *used; if (vhost_put_user(vq, cpu_to_vhost16(vq, vq->used_flags), - &vq->used->flags) < 0) + &vq->used->flags, VHOST_ADDR_USED) < 0) return -EFAULT; if (unlikely(vq->log_used)) { /* Make sure the flag is seen before log. */ @@ -1706,7 +1706,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq) static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event) { if (vhost_put_user(vq, cpu_to_vhost16(vq, vq->avail_idx), - vhost_avail_event(vq))) + vhost_avail_event(vq), VHOST_ADDR_USED)) return -EFAULT; if (unlikely(vq->log_used)) { void __user *used; @@ -2189,12 +2189,12 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq, used = vq->used->ring + start; for (i = 0; i < count; i++) { if (unlikely(vhost_put_user(vq, heads[i].elem.id, - &used[i].id))) { + &used[i].id, VHOST_ADDR_USED))) { vq_err(vq, "Failed to write used id"); return -EFAULT; } if (unlikely(vhost_put_user(vq, heads[i].elem.len, - &used[i].len))) { + &used[i].len, VHOST_ADDR_USED))) { vq_err(vq, "Failed to write used len"); return -EFAULT; } @@ -2240,7 +2240,7 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vhost_used_elem *heads, /* Make sure buffer is written before we update index. */ smp_wmb(); if (vhost_put_user(vq, cpu_to_vhost16(vq, vq->last_used_idx), - &vq->used->idx)) { + &vq->used->idx, VHOST_ADDR_USED)) { vq_err(vq, "Failed to increment used idx"); return -EFAULT; } -- 2.7.4