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Fri, 14 Aug 2026 07:46:42 -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 2/3] vhost/vsock: discard IOTLB when ACCESS_PLATFORM is cleared Date: Fri, 14 Aug 2026 22:45:57 +0800 Message-Id: <20260814144558.134314-3-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_vsock_set_features() currently leaves the device IOTLB attached when userspace clears VIRTIO_F_ACCESS_PLATFORM. Descriptor translation can therefore continue to use mappings installed before the feature change, including HVAs made stale by a later memory table update. Use the common vhost helper when ACCESS_PLATFORM is absent. The helper handles the no-IOTLB case internally, while the common initializer keeps an existing IOTLB when ACCESS_PLATFORM remains enabled across a feature update. Fixes: e13a6915a03f ("vhost/vsock: add IOTLB API support") Suggested-by: Michael S. Tsirkin Signed-off-by: Jia Jia --- drivers/vhost/vsock.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 1d8ec6bed53e..1a61d7db7605 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -849,10 +849,11 @@ static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) goto err; } - if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) { + if (features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)) { if (vhost_init_device_iotlb(&vsock->dev)) goto err; - } + } else + vhost_clear_device_iotlb(&vsock->dev); vsock->seqpacket_allow = features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET);