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Fri, 14 Aug 2026 07:46:57 -0700 (PDT) From: Jia Jia To: stefanha@redhat.com, sgarzare@redhat.com, mst@redhat.com, jasowangio@gmail.com Cc: eperezma@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 3/3] vhost/net: discard IOTLB when ACCESS_PLATFORM is cleared Date: Fri, 14 Aug 2026 22:45:58 +0800 Message-Id: <20260814144558.134314-4-physicalmtea@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260814144558.134314-1-physicalmtea@gmail.com> References: <20260814144558.134314-1-physicalmtea@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit vhost_net_set_features() leaves the device IOTLB attached when userspace clears VIRTIO_F_ACCESS_PLATFORM. Later descriptor translation can therefore continue to use translations from the old IOTLB after the userspace memory table has changed. Use the common vhost helper when ACCESS_PLATFORM is absent. The helper handles the no-IOTLB case internally, while the common initializer also keeps an existing IOTLB when a feature update retains ACCESS_PLATFORM, so logging updates do not discard valid translations. Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API") Link: https://lore.kernel.org/all/20260726141158.1652386-1-physicalmtea@gmail.com/ Signed-off-by: Jia Jia --- drivers/vhost/net.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index c6536cad9c4f..8d6f530f49b3 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -1687,7 +1687,8 @@ static int vhost_net_set_features(struct vhost_net *n, const u64 *features) if (virtio_features_test_bit(features, VIRTIO_F_ACCESS_PLATFORM)) { if (vhost_init_device_iotlb(&n->dev)) goto out_unlock; - } + } else + vhost_clear_device_iotlb(&n->dev); for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { mutex_lock(&n->vqs[i].vq.mutex);