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 B5D53257821 for ; Tue, 30 Dec 2025 10:16:15 +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=1767089778; cv=none; b=CCh4OVh9Yeex/HUtZuYZpIlkDBy0Gcmh16iBbpqaXGadigtYf4Cmk3H+STdmI+OhFQEhBCVSxLFNF4R6LdnrW8CY0gHoLfqXcE4fkYL7FMmoYlkDNA1GYTB+Z5Tyjutt6O4YBxilFtETuGp7yvSkPxHdH1N9WDlcBr9oRzsrOl8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767089778; c=relaxed/simple; bh=1nvGVVfYMss4t3CEcUrrF8Nk2cSppyMGKm3YyiTIiKQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=KiBGKZqHs85RnrwN/hYWLTfUW9VBYRwZ/g1feY8deNa3DO5wRB1e9LR2CubeZs4yOe29eyCHtjdoeb4z7jajIwwjBHXCFPLclDIJaNwcKK6oZZ7vHUcey2q6LG6/ULoSYT2dQZXLnpHp6Zz+Lg5U6fkFmmovvGzpQGWzeqcYSdo= 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=JUV93+Gv; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=D8kiRJdc; 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="JUV93+Gv"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="D8kiRJdc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1767089774; 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=N7TdGrHAal4YSCbHD/e5fBMwf7XbmUGP5Z2mh/ui0sA=; b=JUV93+GvNWX3nxpTw8cau2vP30RBijuoxCYWrIDxyYcvX4p3XvCk95xccbON6+L/U3eb9t si8hWuSvT4Mt3QErEjU5PTb0AlztpEMPM3HXaJlVfXud/33UjYfqDajJuESmoRTs+TkhT4 8bBFTetu85d5QnbDKsQ6WrE2G/IJ4h8= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-184-4YVmyVFZMESpD4uEeqNzbw-1; Tue, 30 Dec 2025 05:16:12 -0500 X-MC-Unique: 4YVmyVFZMESpD4uEeqNzbw-1 X-Mimecast-MFC-AGG-ID: 4YVmyVFZMESpD4uEeqNzbw_1767089772 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-47918084ac1so83216265e9.2 for ; Tue, 30 Dec 2025 02:16:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1767089771; x=1767694571; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=N7TdGrHAal4YSCbHD/e5fBMwf7XbmUGP5Z2mh/ui0sA=; b=D8kiRJdccnjA7UBfQdPD1dIdRkpZkqA8vResLYU9t9f20l4nQJx5GuLg0IRRo4HmkA Ez9QUd8ztax/ZM6qlWpStt6ig9rAwGG18m9odbjAYC7V/8aib3iWrs8f6Glxnfo92e6M kbzp51OUt/jpLMIaQ9dSi354rrPCe5h6M+dOEHdwzUrk1FtyKjQU3A+QpWIY5VrGfgPZ GasDPxSRI4RFXD/RE1XwOWs4ZpqcTdTHkb9bC/VEyiOzSm70/GLjGNOKak5FNDBdiJa7 ZMR2k8LgePJspuqK6/IhpTuKlpvOtJWOoqS7UikPR07hhtZjj/ERppykuPbLuGVi1fLU yJXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767089771; x=1767694571; 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=N7TdGrHAal4YSCbHD/e5fBMwf7XbmUGP5Z2mh/ui0sA=; b=T2Gr8Xj4yc9FsUZbDpQas7A6ZO+GABnOhq61V1sTLMd1YnokPHMTpzQ7mrn0W25iQR 7/+yUFrgLLrXcfaGAFLdTgNMP/pY7tpd58KOFgRbTYJlUgSalgkAmpKIbpnmoshB0Wtr pJoWx4MTLcyrrMkmBpQPlC9QlsdzVvInwIfo2L9ad93fp5I6nTjviavr7tISqgKHhgSe ezv2pZz9xu4mPrXnhmXfC79C/CjL9NARfpnvpQVG68+KAgepGpSQ/kQRxXJOlKjXYYXm B4jE4cSknD32gVXg28+d1HSnNOC3CsZ5JfdrcVpBsQ/eaxmrr3Tf3FZP3CJ2Nm9kzS5r YqiQ== X-Forwarded-Encrypted: i=1; AJvYcCWYQ9+Q1DFtsL7/YLzf+eCd1m/BOObLOKc6LiSKlE+Axfmu3TxzFiItY5fGhz+dovN9l13e8EE=@vger.kernel.org X-Gm-Message-State: AOJu0YyKeDVY4K0I4lN0BZrcA/xuEX47/aJyCfiGg3KTFtoh4VfgXExZ knI/F+SHHnAIG0Mvbrp30an5mLL2E7O3dZK/EmCqT29D/mr2025HaG94VTvjNqWqvjiwddgIxtP 7flMWRJdMbDlyOuWEJpg+NrtoLZQPKr2wJaLyIA0XZTEE3ndczsjBjreP5Q== X-Gm-Gg: AY/fxX7ljRRqvgIkscvCdoNPGmEz/UXHhCBD02ZuOyaHR4ffZDei0z3WWG4wDY19SjE oo0F862kBBom+ARI6X7ZElMqAgY+651DuaGGy3vHS/pL12wwmvmQM/wcNf1IhMUlUlc2x9JLYFX MMvXctUYFh7Oo+rjswhMpxSGdI9J9dJ98+rYR4V575hVcQJtLxV33tr0vmaes3pzoPfWAjLi88Q rFrbDfRAXXwFlqw565R/hFTtlShkoanhodZRujbVLJzBkvPY4+J8r3CnnFvS5Iv3UjrLGM2VxHB KDnxOV0Wl6nTesW1vtUU5NeyEVboMJTkX7BHmNMy6Yr0BIYvBrRJrxIcwUi7MW5qmLoI5yuLPcl HMJRJkdSAegb/KRsDLNglLUocCgS2cG3lPQ== X-Received: by 2002:a05:600c:45c8:b0:477:8a2a:1244 with SMTP id 5b1f17b1804b1-47d195558bemr375729695e9.11.1767089771393; Tue, 30 Dec 2025 02:16:11 -0800 (PST) X-Google-Smtp-Source: AGHT+IHjzVX0GYuttaIVhsj3PIAp1ZJ2Zp++QasW4yFBwV4WaDkrZ/icz8/Y8CMg+xDJDk6ilEld2g== X-Received: by 2002:a05:600c:45c8:b0:477:8a2a:1244 with SMTP id 5b1f17b1804b1-47d195558bemr375729355e9.11.1767089770967; Tue, 30 Dec 2025 02:16:10 -0800 (PST) Received: from redhat.com (IGLD-80-230-31-118.inter.net.il. [80.230.31.118]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47d193d4e91sm569777955e9.13.2025.12.30.02.16.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Dec 2025 02:16:09 -0800 (PST) Date: Tue, 30 Dec 2025 05:16:07 -0500 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: 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 , Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Petr Tesarik , Leon Romanovsky , Jason Gunthorpe , 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: [PATCH RFC 07/13] vsock/virtio: fix DMA alignment for event_list Message-ID: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent On non-cache-coherent platforms, when a structure contains a buffer used for DMA alongside fields that the CPU writes to, cacheline sharing can cause data corruption. The event_list array is used for DMA_FROM_DEVICE operations via virtqueue_add_inbuf(). The adjacent event_run and guest_cid fields are written by the CPU while the buffer is available, so mapped for the device. If these share cachelines with event_list, CPU writes can corrupt DMA data. Add __dma_from_device_aligned_begin/end annotations to ensure event_list is isolated in its own cachelines. Signed-off-by: Michael S. Tsirkin --- net/vmw_vsock/virtio_transport.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 8c867023a2e5..76099f7dc040 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -59,8 +60,10 @@ struct virtio_vsock { */ struct mutex event_lock; bool event_run; + __dma_from_device_aligned_begin struct virtio_vsock_event event_list[8]; + __dma_from_device_aligned_end u32 guest_cid; bool seqpacket_allow; -- MST