From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5D74A212FB8 for ; Thu, 20 Feb 2025 16:15:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740068154; cv=none; b=jZvk86QIxHwlYOKZLNySEbsOKhbmmdCs9MjcXlbdTtrSzgPKmfLd/lKV4QEwG0tvK3XKLekmz1wlXti+nD97+RShDpPoBjaaM8493W709VJ4JVCFU/rWmns34y1g6opvPHHVkL44wXHm6PdoVdvAGqQtOA+5lpPP3yqGTHzVTuY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740068154; c=relaxed/simple; bh=sefj6hxNE4DKzJ9Uo+g0WJ+GyLGTay+PVJVsLpQlNGY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=J/6TsRNJLzDaQDZBpTVNbvMitvmKMKXE0RyKOPy6xHyYuGVMn849uadDPSCwUHZXGNQ+aIf3GGtXK6zFPwTAdHjsHZfCMyRuZwysAzekN+z3G0Y53e2AUh0l69wuQrPgb9k6+jjofiOIiCVTZ33OEq8p8GAknrMa2CUS9XhJW5Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=guyNccts; arc=none smtp.client-ip=209.85.214.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="guyNccts" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-22117c396baso172405ad.1 for ; Thu, 20 Feb 2025 08:15:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1740068152; x=1740672952; darn=lists.linux.dev; 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=w9z6CJ8GEmOUY+R90CcF3D8uqozLmZO9LjzSZXbDX8o=; b=guyNcctsrqox2KP8yrGpU+AcrrYAmBxK1eq11pMmVNK+7J/fB6PODgl695j61EHiiv 1f6B/2WZg2TbE/RIzLo58A7D16sL3+Qkiwc6TLmK5gxRH/6iThWL5JAdUYB9kKhFL+8X qvs9qHHP84mzDnV0gcKLhV3ixGR2y4tHVj4z5L9cT1TQOdlU+Zp7RWKGlulgqwppgnI+ iuDIVrViO9JCfMAIw3ZsJ7G3OAXtEpre7JxyvgZcsZ/QHftK+XUj5QiGU2sAHgR7su7C 1zlyzuFOkxJSVt7meAAfGm0vBp4LdnUP5PuNNK20v1Pvon6k7YC54rpfPiwN3xhSh36H zJnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740068152; x=1740672952; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=w9z6CJ8GEmOUY+R90CcF3D8uqozLmZO9LjzSZXbDX8o=; b=ZzJhCf1xy/ddu6XyzaroXjmwiBhioKDZ/zi8zGvDTH3LkXs9LQDv4wkfqvBzKqx1lc vAUTxkGfpPFPwIBo9qmSmYOQI4TvSJB+x+QoM+WQI61afse/O77zPuFLD1epnzA0NR0z NVW9QotsYsJHdODeUGPP9dNkSHyoucjWr70EVgaXM49jTGA/3PjrZvHMkoFZQo/FUL1e BcA9FkRbGuqKrQp/qapNfkr/T7S1FsxMyIJ7FHfnBRu4I818SMLwabCXI66N5qet+V2Y x/Lzi5oOEGu/YdOPUn6kehlqRMrlr49Ln/G0R//AtfdCBTZ+HCSNIccgYm0DscSu9dF8 jX9Q== X-Forwarded-Encrypted: i=1; AJvYcCUaTx9fPVQIbmM01gW8eqjkurByrZ6+X+qKynbEBfickmm0hO1tGxVdMYbUpXMM75wISqsV8w==@lists.linux.dev X-Gm-Message-State: AOJu0Ywtffv14VKjD8ENmZQl3QL1bUKCyBMWhVuXEvGFgbxYJzoZre1n Q+Du1MvscF7cjmyXteoxDLYVe9cPt1dEp6aXqPAIx8XhUSIJTgMAuN7ulUUk5A== X-Gm-Gg: ASbGnctLvxYmjUPP4gyfZroAA87fZkBm8N5KFCLpT6WQwHIAowS16ETSl+PWxBtRNMM gUmJRlqIuobizYZUnR0gcnUYMWOqVDHNBFfHBQ9JR7vyrjIrd1WLL/bNSE/kgaM/Cyzdj4A9n5G lUZaJGu3jd8A9DVXQupKDUgN57RLG3uQElNOSVuMMmlTEzuZ/2X7TCdyHqOUXLLPa6UQuclp4qm ZIE/yKTYmHUIPPgNa3WD4J21KSUSM1bRiyEHivLGtdncSKoAGrkKEgRNPQO9RqYe4rxJ5MM3yKs 3YeHmrTDvBpH1TqGPu3sLr5NgMqNJ4cL0mrfW/doRe5jDIcNwuZ4 X-Google-Smtp-Source: AGHT+IEeeNO5YXG4GrTFzHJDa5KXpncdRPcsXRbYIZYGBm4w3MV78t3++PWrZwNmDnY5dth9MgRnnA== X-Received: by 2002:a17:902:dacf:b0:21f:3e29:9cd4 with SMTP id d9443c01a7336-2218debe8bamr3119545ad.20.1740068151245; Thu, 20 Feb 2025 08:15:51 -0800 (PST) Received: from google.com (169.224.198.35.bc.googleusercontent.com. [35.198.224.169]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2fc7e9325fesm8522382a91.46.2025.02.20.08.15.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Feb 2025 08:15:50 -0800 (PST) Date: Thu, 20 Feb 2025 16:15:40 +0000 From: Pranjal Shrivastava To: Nicolin Chen Cc: "Tian, Kevin" , "jgg@nvidia.com" , "corbet@lwn.net" , "will@kernel.org" , "joro@8bytes.org" , "suravee.suthikulpanit@amd.com" , "robin.murphy@arm.com" , "dwmw2@infradead.org" , "baolu.lu@linux.intel.com" , "shuah@kernel.org" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kselftest@vger.kernel.org" , "linux-doc@vger.kernel.org" , "eric.auger@redhat.com" , "jean-philippe@linaro.org" , "mdf@kernel.org" , "mshavit@google.com" , "shameerali.kolothum.thodi@huawei.com" , "smostafa@google.com" , "ddutile@redhat.com" , "Liu, Yi L" , "patches@lists.linux.dev" Subject: Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations Message-ID: References: <436ac2021bb3d75114ca0e45f25a6a8257489d3b.1737754129.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Feb 18, 2025 at 10:53:55AM -0800, Nicolin Chen wrote: > > > Is MEV available only in nested mode? Otherwise it perhaps makes > > > sense to turn it on in all configurations in IOMMUFD paths... > > > > I think the arm-smmu-v3's iommufd implementation only supports nested > > which could be the reason. > > I guess what Kevin says is that non-nested STE should set the MEV > as well, e.g. BYPASS and ABORT, and perhaps stage-1-only case too > where the attaching domain = UNMANAGED. > Ohh okay, got it. Thanks! Praan