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From 82b9c1540348b6be7996203065e10421e953cea9 Mon Sep 17 00:00:00 2001
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From: Maxime Coquelin <maxime.coquelin@redhat.com>
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Date: Mon, 5 Feb 2018 16:04:57 +0100
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Subject: [PATCH] vhost: remove pending IOTLB entry if miss request failed
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In case vhost_user_iotlb_miss returns an error, the pending IOTLB
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entry has to be removed from the list as no IOTLB update will be
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received.
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Fixes: fed67a20ac94 ("vhost: introduce guest IOVA to backend VA helper")
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Cc: stable@dpdk.org
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Suggested-by: Tiwei Bie <tiwei.bie@intel.com>
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Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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---
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lib/librte_vhost/iotlb.c | 2 +-
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lib/librte_vhost/iotlb.h | 3 +++
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lib/librte_vhost/vhost.c | 13 ++++++++++---
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3 files changed, 14 insertions(+), 4 deletions(-)
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diff --git a/lib/librte_vhost/iotlb.c b/lib/librte_vhost/iotlb.c
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index 72cd27df8..c11ebcaac 100644
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--- a/lib/librte_vhost/iotlb.c
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+++ b/lib/librte_vhost/iotlb.c
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@@ -120,7 +120,7 @@ vhost_user_iotlb_pending_insert(struct vhost_virtqueue *vq,
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rte_rwlock_write_unlock(&vq->iotlb_pending_lock);
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}
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-static void
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+void
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vhost_user_iotlb_pending_remove(struct vhost_virtqueue *vq,
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uint64_t iova, uint64_t size, uint8_t perm)
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{
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diff --git a/lib/librte_vhost/iotlb.h b/lib/librte_vhost/iotlb.h
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index f1a050e44..e7083e37b 100644
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--- a/lib/librte_vhost/iotlb.h
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+++ b/lib/librte_vhost/iotlb.h
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@@ -71,6 +71,9 @@ bool vhost_user_iotlb_pending_miss(struct vhost_virtqueue *vq, uint64_t iova,
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uint8_t perm);
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void vhost_user_iotlb_pending_insert(struct vhost_virtqueue *vq, uint64_t iova,
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uint8_t perm);
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+void vhost_user_iotlb_pending_remove(struct vhost_virtqueue *vq, uint64_t iova,
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+ uint64_t size, uint8_t perm);
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+
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int vhost_user_iotlb_init(struct virtio_net *dev, int vq_index);
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#endif /* _VHOST_IOTLB_H_ */
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diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
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index a31ca5002..a407067e2 100644
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--- a/lib/librte_vhost/vhost.c
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+++ b/lib/librte_vhost/vhost.c
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@@ -42,7 +42,9 @@ __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
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if (tmp_size == size)
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return vva;
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- if (!vhost_user_iotlb_pending_miss(vq, iova + tmp_size, perm)) {
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+ iova += tmp_size;
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+
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+ if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
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/*
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* iotlb_lock is read-locked for a full burst,
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* but it only protects the iotlb cache.
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@@ -52,8 +54,13 @@ __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
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*/
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vhost_user_iotlb_rd_unlock(vq);
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- vhost_user_iotlb_pending_insert(vq, iova + tmp_size, perm);
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- vhost_user_iotlb_miss(dev, iova + tmp_size, perm);
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+ vhost_user_iotlb_pending_insert(vq, iova, perm);
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+ if (vhost_user_iotlb_miss(dev, iova, perm)) {
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+ RTE_LOG(ERR, VHOST_CONFIG,
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+ "IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
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+ iova);
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+ vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
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+ }
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vhost_user_iotlb_rd_lock(vq);
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}
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--
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2.14.3
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