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Message-ID: <e8a8f8c3a2d67b25dd261184da6684fda1813c6d.1725616135.git.mst@redhat.com>
Date: Fri, 6 Sep 2024 05:52:44 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
virtualization@...ts.linux.dev, Si-Wei Liu <si-wei.liu@...cle.com>,
Darren Kenny <darren.kenny@...cle.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Eugenio PĂ©rez <eperezma@...hat.com>
Subject: [RFC PATCH v2 7/7] Revert "virtio_ring: enable premapped mode
whatever use_dma_api"
This reverts commit f9dac92ba9081062a6477ee015bd3b8c5914efc4.
leads to crashes with no ACCESS_PLATFORM when
sysctl net.core.high_order_alloc_disable=1
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Reported-by: Si-Wei Liu <si-wei.liu@...cle.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
drivers/virtio/virtio_ring.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index be7309b1e860..06b5bdf0920e 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2782,7 +2782,7 @@ EXPORT_SYMBOL_GPL(virtqueue_resize);
*
* Returns zero or a negative error.
* 0: success.
- * -EINVAL: too late to enable premapped mode, the vq already contains buffers.
+ * -EINVAL: vring does not use the dma api, so we can not enable premapped mode.
*/
int virtqueue_set_dma_premapped(struct virtqueue *_vq)
{
@@ -2798,6 +2798,11 @@ int virtqueue_set_dma_premapped(struct virtqueue *_vq)
return -EINVAL;
}
+ if (!vq->use_dma_api) {
+ END_USE(vq);
+ return -EINVAL;
+ }
+
vq->premapped = true;
vq->do_unmap = false;
--
MST
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