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 DB2072F8E90 for ; Sun, 28 Jun 2026 23:06:15 +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=1782687977; cv=none; b=LvHJl8I2l4J0g+4IbHhU3QV+b66z26YJp9seq9vPLdrkiqXNv9Af+rWHyzfs1ZJc1CBSPzWEP3nT27kHSQkH+PSOZN83IZFlJsQ1Jg9hCUM5UVkMYBYL2HExe7OdTgD4pBao9uUVeIgsrnsrEXR/H70HSs63sKP40La4lbfSpDU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782687977; c=relaxed/simple; bh=Etgv1zt6H58TAeWQ2Ok+9a/koljupx+SXENx+QnUjf4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=kEtAxmwirHtZgdo34Xo/BEXQBg4e4SzJDSmeUZa6msBeFgjvV/fWiL/Wd2tEijghMYPB9ugtpQq8bKTAIf8NUW6jHQvn4ykKwkozGsK+VjiPHLtPvi7WebjdM2b2jtYmclG3aVSPa4AsVFdftEdFHiA/mVMEwxUqCHAv0ZJ7Zzw= 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=SUf4qTZ3; 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="SUf4qTZ3" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-2c9b2ac97cdso20515ad.1 for ; Sun, 28 Jun 2026 16:06:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1782687975; x=1783292775; darn=lists.linux.dev; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=w9ASwZXxOhuIEA88U9uqvxx2ThgVPLf9gDKq6x0EUXg=; b=SUf4qTZ3itdccxG6pFkcu4NMrxdnQI4WDBRlyEUP54CWy29L/pZPp++sttwO55K7AC w7qj0aYkdWuF1pbje8gM2FfexWOwVYk5XZfDK55lFaNMLnA/N0WERZ4QgKsDErYSzdwC eBdivxtLQw2HRrr0WdNH7Q8X/XskYaU+hgpH9KUHvWRPYtaxDCFwm7ocCxpooKSDwLe/ FSQ2RSNENLUm4aP2IJi2zRAoCH6hAqOdLlpI1cOlD0HsQC93Dg3Z9D/NZyuvvVw5uhds gg4ofRmUVLjUx/+GhRL5RECZJAdVQb2U3/Avp4lMXZynIv+nrpTRH8rO+b50SyUT+r89 PrVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782687975; x=1783292775; h=in-reply-to:content-disposition:content-type: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 :content-type; bh=w9ASwZXxOhuIEA88U9uqvxx2ThgVPLf9gDKq6x0EUXg=; b=c4zFfiAgulTF4OXf5xoaLXEsJ3KQakHIxLL4IdWpWPrx4dIdnGyFoKc/JpJHi8AlSU 0BUiWQGpSdGkBjWI169KBJB0s0hgMCr59jNCYtgn9Ogn6VZ028GyQ2jUS870hKQ8nu2J pMYHyWpzzKUQy0fibiqzQFYlFk4Myck9gx7jejYoK+glSP2h/etsEygoG0F5S6tearcE fRT7zpSJuLm0CminpiV5a2AaDG0YC3rSuNkl8UM2vJRtHsm6d3sgGvmvrn6W3Bv1ccGl vK+7RtWA67RSM4MmUo3LPVepbPzQQozgVh5HnJ8WGopeNzggBeAIgkviwWiXq+FaCuLv /b4A== X-Forwarded-Encrypted: i=1; AHgh+RqpmUZGyDveE3sEKBuKCupKyRBI7l3gORsD6OoUcpwHx7pwFg8MIP6vVHr1vgmBo0lyD5cnCg==@lists.linux.dev X-Gm-Message-State: AOJu0YxAVDdKX9VYAMZ/PJ1WU+xricJOSIg+6NhaJOVsYN7PRPhzkH0f KeCSxYISXOElvrWt4vyQIagHQJ7VfUqx+bRN+jfSmkH7rTNtUx3z78tr4Axn2pRusA== X-Gm-Gg: AfdE7ckFy/HrvVsov3tXt0KSe7vkDy735q7FOCHPxP8XJSaap/IDTlV8anp0nNQnce6 OQJHBWvEK35uDY7F7UN9mO+qfO1RZqoZRXD/RSlp6y8pPPjO+kLERV70Uomi0gM6mgxkyrsjuqu xfUMUkyyTQOwpHBpqbpBkDH6e/NzrbjUT4MN2lxqQ9s6psO/YyIve2jggG1jjPHbdV5clXL4LAr TNUMbqEXBIo7MkxJhbttjjP8OINdSpHCW0+Gjhb60piFebg6QHJg70Ol0qmMexsHnFHgrxSqg6S obvN727MlbOt05L/zg4wv9s8SX6wVQGJuw7pqFQiYu6DB18XoGGLQcDaDm35DnhC1XqHIp2HnC/ R28SOm4q8/ck1GXijiEd5K7MXfoNqtI9NYgSu/HUnfrctUHOQSrbSJHfv8AJZ14kvk2OiA8N0zA 5tm0+YZ+MB+ON8+GmscbZw/IUZMcpYp31wyK/NlwzN6K/QzWX7qqxJ6RkxTQ== X-Received: by 2002:a17:902:fd87:b0:2c1:ee6e:be1c with SMTP id d9443c01a7336-2c9a27fbf39mr2722965ad.26.1782687974705; Sun, 28 Jun 2026 16:06:14 -0700 (PDT) Received: from google.com (10.129.124.34.bc.googleusercontent.com. [34.124.129.10]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ca0b454815sm3400655ad.2.2026.06.28.16.06.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 28 Jun 2026 16:06:14 -0700 (PDT) Date: Sun, 28 Jun 2026 23:06:07 +0000 From: Pranjal Shrivastava To: Nicolin Chen Cc: will@kernel.org, robin.murphy@arm.com, jgg@nvidia.com, joro@8bytes.org, kees@kernel.org, baolu.lu@linux.intel.com, kevin.tian@intel.com, miko.lenczewski@arm.com, smostafa@google.com, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, stable@vger.kernel.org, jamien@nvidia.com Subject: Re: [PATCH rc v6 2/7] iommu/arm-smmu-v3: Implement is_attach_deferred() for kdump Message-ID: References: <89cbd3760a13f11cf63f6ead12f44974511f308a.1779265413.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: <89cbd3760a13f11cf63f6ead12f44974511f308a.1779265413.git.nicolinc@nvidia.com> On Wed, May 20, 2026 at 10:03:19AM -0700, Nicolin Chen wrote: > Though the kdump kernel adopts the crashed kernel's stream table, the iommu > core will still try to attach each probed device to a default domain, which > overwrites the adopted STE and breaks in-flight DMA from that device. > > Implement an is_attach_deferred() callback to prevent this. For each device > that has STE.V=1 and STE.Cfg!=Abort in the adopted table, defer the default > domain attachment, until the device driver explicitly requests it. > > Fixes: b63b3439b856 ("iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel") > Cc: stable@vger.kernel.org # v6.12+ > Reviewed-by: Kevin Tian > Reviewed-by: Jason Gunthorpe > Signed-off-by: Nicolin Chen Reviewed-by: Pranjal Shrivastava Thanks, Praan