From patchwork Mon Nov 22 16:35:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Garzarella X-Patchwork-Id: 12632531 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B77BC433EF for ; Mon, 22 Nov 2021 16:36:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240256AbhKVQj6 (ORCPT ); Mon, 22 Nov 2021 11:39:58 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:27479 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239729AbhKVQj5 (ORCPT ); Mon, 22 Nov 2021 11:39:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1637599010; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cCstxEhvvwRRHc2gpQNHM9jyHCtg2U6yhX+P/CPEdFU=; b=BswZjTGkGcwD/7uX7HvB/Ii0htEskb1fSGDeg+yM1A4jCDV5wzu1XHgbundXIGRjXN31zA UuY4KXuSrtNVok6EFdx1frug3b9mJSyRAURem10Y5T7LICW8cEL2hGk4qpTmuxYHYkUDnR pKp+6VQ1jiW2V4fmFnT7ZdIRwqkVON0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-475-jYJTi5e_MyKh8y2KEYZ-lQ-1; Mon, 22 Nov 2021 11:36:47 -0500 X-MC-Unique: jYJTi5e_MyKh8y2KEYZ-lQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BDBCB1023F4E; Mon, 22 Nov 2021 16:36:45 +0000 (UTC) Received: from steredhat.redhat.com (unknown [10.39.192.181]) by smtp.corp.redhat.com (Postfix) with ESMTP id 44EA560C5F; Mon, 22 Nov 2021 16:36:08 +0000 (UTC) From: Stefano Garzarella To: virtualization@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, Stefano Garzarella , Jason Wang , Stefan Hajnoczi , netdev@vger.kernel.org, Halil Pasic , kvm@vger.kernel.org, Asias He , "Michael S. Tsirkin" Subject: [PATCH 1/2] vhost/vsock: fix incorrect used length reported to the guest Date: Mon, 22 Nov 2021 17:35:24 +0100 Message-Id: <20211122163525.294024-2-sgarzare@redhat.com> In-Reply-To: <20211122163525.294024-1-sgarzare@redhat.com> References: <20211122163525.294024-1-sgarzare@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The "used length" reported by calling vhost_add_used() must be the number of bytes written by the device (using "in" buffers). In vhost_vsock_handle_tx_kick() the device only reads the guest buffers (they are all "out" buffers), without writing anything, so we must pass 0 as "used length" to comply virtio spec. Fixes: 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko") Cc: stable@vger.kernel.org Reported-by: Halil Pasic Suggested-by: Jason Wang Signed-off-by: Stefano Garzarella Reviewed-by: Halil Pasic --- drivers/vhost/vsock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 938aefbc75ec..4e3b95af7ee4 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -554,7 +554,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) virtio_transport_free_pkt(pkt); len += sizeof(pkt->hdr); - vhost_add_used(vq, head, len); + vhost_add_used(vq, head, 0); total_len += len; added = true; } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));