From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A05A155A5D for ; Thu, 29 Jan 2026 08:42:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769676140; cv=none; b=U1zwz3V4fSaSDJVFUZ58n1V1N/hVvloyyfNrSG94OMJML7MZRykWfGxLLXJRfXG4sn95JoYoycORjdnVT2VmOj9YCc2UlcAPexghdQyHbaSp55tF7YC53fKFu/SwqBOaN4PXepiuBEPodR0aq4plzp+1OGYSQziCgemH7c8thKg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769676140; c=relaxed/simple; bh=Bs6mTjUeA5qkWiBJBxqsJFMQQCY3VsRZlZa2vBfNivk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: In-Reply-To:Content-Type:Content-Disposition; b=kswUXfUFtF2IbqU01zCEXvhsAWdj+R/50xh5vb3wdLSxQHxUW2HY2Ts2n2DiY3jfdI8fJ2fFhgMYPss3O668cZrVk6GMuttGTVbRrE8PlCvIjZOLwH5WhNHLlCQPHTQMnbceGOEyxTBDIE/KB0FpkuV1Qr548G3XeeQ+pYVNOJA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=VWMB9joG; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="VWMB9joG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769676137; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=THtu/B0OMAesHMQ0Tb4jSeVco+ToRrfio4hfGUipZDw=; b=VWMB9joGXYC7p4SXDrqZ3kZ3eOqnv+1+GtytduFRo7jVG9Ybe1PWzU0Bt8QeKVgfkfWdz6 zmGDLVMkEvnLW0E9bRuhO3BQN7RGMB8HvHXXW10KrTRrtR3xoELejQ01NarfC09UEGnnFN zyLUAx/s2WOiULXH4ByRf/0obMLKfDs= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-676-_okSPxzSNOu-P0IUP21bkg-1; Thu, 29 Jan 2026 03:42:15 -0500 X-MC-Unique: _okSPxzSNOu-P0IUP21bkg-1 X-Mimecast-MFC-AGG-ID: _okSPxzSNOu-P0IUP21bkg_1769676134 Received: by mail-wr1-f71.google.com with SMTP id ffacd0b85a97d-430fcb6b2ebso399629f8f.2 for ; Thu, 29 Jan 2026 00:42:14 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769676134; x=1770280934; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=THtu/B0OMAesHMQ0Tb4jSeVco+ToRrfio4hfGUipZDw=; b=poG/V4UCZvyuh5lZgu17+JJpd7QVua15E/eOO3tDLalvnhsNQnv4qL4P8N8KiTXwPM Xso/hORJa2DwB0iQ5xy5DcFSwrUBcQS5LJXfzN6F0u5TsGdFV2ZfMuoEvGxRePO4PRFf +QbpKuReQ2JiLET5qzUZsZWHZGLLkFXq+k6I0qvVBz9LKjlo5gz1eoUOIwMDIGZBoFzV A3+k+W/9eLrzE3nqJXb5gtSov19Xf5ofDIxX+DJmoUwCBCvWcf4cTRKiVS8dK2Kf/iW+ Fr4BF/XlFBQCGozRIRSBZRopiHwMeln54D2YWyjajF5/pZazDarO0zn6n7l/VJSKyD3y 9rDw== X-Forwarded-Encrypted: i=1; AJvYcCXjmqAV1mYaGTlCHUzEpYMwtAhIDafs0ZtpiIASmrNKoMsoeJoMTj5M3ycxqMlaJVLb7ynxIg==@lists.linux.dev X-Gm-Message-State: AOJu0YzMfTxqnMfzH1dK0D0MoLgq3NBIIycyk02zpKvwUsM7ep5hI0hO +4feZFK9J+RiGh5G/s8XyeKD9UmgfHM4MRT7bdgwqmyO3e1rTLg4MD2g+MWAm/P17tlJPrZfTyF kCdc9oJLU+jlAKYc8fG50r2Nobf3n6Qj9FdhNdoWWlSXFCVX+8MZKvir9 X-Gm-Gg: AZuq6aLBfM4SkcuPpFKxCnaWF7IMWPB3BYG1MsowqSRjAKyuQ6+2MKpP/UyHqpzXw0V +vbu+P/rlbwdJU9+x2GWLzWy3CHmdymTds1TFsADlK1xXs0CpJ97+O+IOWHQB+Xn6w3578nuJ3p tFVEvYU5AHN4TdzFmeVWgJXgPn0hwrVeu3ZPVYPfXFnnlOiRB7L6qJT0QWREdqy93RlpUIZZ+pN FAwIadloVM5CwQoDYkCEshorZWTNJENlh5scNKxiUuQlCHXinFX6IOmPCTpXWx9XZ23zICbPUDp S7hTUitrBfy3xIFi1kpr2a2nIQj4YmK32iQY5+4eZTpyV30WzCe148A7r/yqWwYcBzjak7StXsh odt6fDQcehY3tMCyGVnNe4FV/L+UyU2h3KXUF00GAM7ZHT2T2Jwig X-Received: by 2002:a05:6000:178b:b0:435:9116:c713 with SMTP id ffacd0b85a97d-435dd02db27mr12237788f8f.5.1769676133911; Thu, 29 Jan 2026 00:42:13 -0800 (PST) X-Received: by 2002:a05:6000:178b:b0:435:9116:c713 with SMTP id ffacd0b85a97d-435dd02db27mr12237753f8f.5.1769676133482; Thu, 29 Jan 2026 00:42:13 -0800 (PST) Received: from sgarzare-redhat (ip110-139-192-82.pool-bba.aruba.it. [82.192.139.110]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-435e10ee040sm12807318f8f.11.2026.01.29.00.42.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Jan 2026 00:42:12 -0800 (PST) Date: Thu, 29 Jan 2026 09:42:06 +0100 From: Stefano Garzarella To: "Michael S. Tsirkin" Cc: linux-kernel@vger.kernel.org, Cong Wang , Jonathan Corbet , Olivia Mackall , Herbert Xu , Jason Wang , Paolo Bonzini , Stefan Hajnoczi , Eugenio =?utf-8?B?UMOpcmV6?= , "James E.J. Bottomley" , "Martin K. Petersen" , Gerd Hoffmann , Xuan Zhuo , Marek Szyprowski , Robin Murphy , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Petr Tesarik , Leon Romanovsky , Jason Gunthorpe , Bartosz Golaszewski , linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, virtualization@lists.linux.dev, linux-scsi@vger.kernel.org, iommu@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH v3 15/15] vsock/virtio: reorder fields to reduce padding Message-ID: References: Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: vSjceHxJ9h7-iWTvOi7mluIyuoAbmoRiTfwyQjZlfqU_1769676134 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline On Wed, Jan 28, 2026 at 03:31:21PM -0500, Michael S. Tsirkin wrote: >Reorder struct virtio_vsock fields to place the DMA buffer (event_list) >last. This eliminates the padding from aligning the struct size on >ARCH_DMA_MINALIGN. > >Suggested-by: Stefano Garzarella >Signed-off-by: Michael S. Tsirkin >--- > >changes from v2: > move event_lock and event_run too, to keep > event things logically together, as suggested by > Stefano Garzarella. Thanks for that! Reviewed-by: Stefano Garzarella > >Note: this is the only change in v3 and it's cosmetic, so I am >not reposting the whole patchset. > > > net/vmw_vsock/virtio_transport.c | 18 +++++++++--------- > 1 file changed, 9 insertions(+), 9 deletions(-) > >diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c >index 999a0839726a..b333a7591b26 100644 >--- a/net/vmw_vsock/virtio_transport.c >+++ b/net/vmw_vsock/virtio_transport.c >@@ -55,15 +55,6 @@ struct virtio_vsock { > int rx_buf_nr; > int rx_buf_max_nr; > >- /* The following fields are protected by event_lock. >- * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held. >- */ >- struct mutex event_lock; >- bool event_run; >- __dma_from_device_group_begin(); >- struct virtio_vsock_event event_list[8]; >- __dma_from_device_group_end(); >- > u32 guest_cid; > bool seqpacket_allow; > >@@ -77,6 +68,15 @@ struct virtio_vsock { > */ > struct scatterlist *out_sgs[MAX_SKB_FRAGS + 1]; > struct scatterlist out_bufs[MAX_SKB_FRAGS + 1]; >+ >+ /* The following fields are protected by event_lock. >+ * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held. >+ */ >+ struct mutex event_lock; >+ bool event_run; >+ __dma_from_device_group_begin(); >+ struct virtio_vsock_event event_list[8]; >+ __dma_from_device_group_end(); > }; > > static u32 virtio_transport_get_local_cid(void) >-- >MST >