From patchwork Fri May 15 10:44:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 11551107 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 58450739 for ; Fri, 15 May 2020 10:48:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42B2520759 for ; Fri, 15 May 2020 10:48:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="P6/7hIE4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728144AbgEOKsd (ORCPT ); Fri, 15 May 2020 06:48:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56336 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728129AbgEOKsd (ORCPT ); Fri, 15 May 2020 06:48:33 -0400 Received: from mail-wm1-x343.google.com (mail-wm1-x343.google.com [IPv6:2a00:1450:4864:20::343]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9556C061A0C for ; Fri, 15 May 2020 03:48:32 -0700 (PDT) Received: by mail-wm1-x343.google.com with SMTP id k12so1835947wmj.3 for ; Fri, 15 May 2020 03:48:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=guIyIxw2Cj+e2cp6UNPEu5aERqphnHRHK0daLjNZEtg=; b=P6/7hIE4DwjSbFHn0gUenOd7tQIjElNY44np4Xp3owXyeiZ5/eDrsF2jXhN1HFtXI9 mzI4y6p5DgU2UcrYdlCXB96VGS31EbpJJbdZ9F86VezeEZeC0/al4dI1yjpzsPObxXFq bH1rMvZMRi2LIS/5qWwon90KoCmlhOIT8yk6ptHFuyroaHqPfVbNWqX4o+QJrImdJg1K yVQAnTXoaK5haWRQFRYea+uFgN4n5RLlto9awJagAWmH0iE5BZWxjLgcRKzajZy0eLZ/ 94povR05970KSOg2HzI7zF8fn1cxzEnzDPqenijZflhH7uWaKOz7YHkN5wHpu/4kyjB0 AxGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=guIyIxw2Cj+e2cp6UNPEu5aERqphnHRHK0daLjNZEtg=; b=Y7x74rfzZXorIHmwj9OH1scnpdBpUz6HSXJhV8X+CuhAb4VMyZVmtbfDiV0un0Yaqy B+ly+j5DZP8o12ViFRGOT1Zodc+hIctAOZQ2QOuSjdLR/CVQg7iLHzN7su8wOZInbUmN U9H2n4vRb0lJfW+3Ac6PBQgAgZf7e90yVSqWwWkgfQCUCRDmACvsVrWPNlsOVFl3wmaQ yCguTwcZWePCKljfNXItRN49+AnFptvQF8jm0xkQAzeoGFR37/TGwB8HU/i6KIW3OVOs icCe0x55qx7O+Q2gVDNiVVwT6ttmQebm7suosqxxO9yw71HX0q0MtiLyqUXbahGNrhX2 i6Qw== X-Gm-Message-State: AOAM531tPpye0+sB0ai4bBnw63pUsZIPX/GW+XSRUIrskeUoFRYqiIn5 9TrpIYnVqToc4h6QcY7elK2XyDXA/wU= X-Google-Smtp-Source: ABdhPJwOoccKW1cdQKZVyETbXOshCl3JLZVuvoDXSwsZotxA+Esgngps5B0KVjlnEG+HNrZiI1lhug== X-Received: by 2002:a1c:1d12:: with SMTP id d18mr3248638wmd.109.1589539711093; Fri, 15 May 2020 03:48:31 -0700 (PDT) Received: from localhost.localdomain ([2001:171b:226e:c200:c43b:ef78:d083:b355]) by smtp.gmail.com with ESMTPSA id h27sm3510392wrc.46.2020.05.15.03.48.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 May 2020 03:48:30 -0700 (PDT) From: Jean-Philippe Brucker To: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, joro@8bytes.org, bhelgaas@google.com Cc: will@kernel.org, robin.murphy@arm.com, dwmw2@infradead.org, baolu.lu@linux.intel.com, ashok.raj@intel.com, alex.williamson@redhat.com, Jean-Philippe Brucker Subject: [PATCH 2/4] iommu/amd: Use pci_ats_supported() Date: Fri, 15 May 2020 12:44:00 +0200 Message-Id: <20200515104359.1178606-3-jean-philippe@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200515104359.1178606-1-jean-philippe@linaro.org> References: <20200515104359.1178606-1-jean-philippe@linaro.org> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The pci_ats_supported() function checks if a device supports ATS and is allowed to use it. In addition to checking that the device has an ATS capability and that the global pci=noats is not set (pci_ats_disabled()), it also checks if a device is untrusted. A device is untrusted if it is plugged into an external-facing port such as Thunderbolt and could be spoofing an existing device to exploit weaknesses in the IOMMU configuration. By calling pci_ats_supported() we keep DTE[I]=0 for untrusted devices and abort transactions with Pretranslated Addresses. Signed-off-by: Jean-Philippe Brucker Reviewed-by: Joerg Roedel --- drivers/iommu/amd_iommu.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 1dc3718560d0e8..8b7a9e811d33a6 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -313,16 +313,15 @@ static struct iommu_group *acpihid_device_group(struct device *dev) static bool pci_iommuv2_capable(struct pci_dev *pdev) { static const int caps[] = { - PCI_EXT_CAP_ID_ATS, PCI_EXT_CAP_ID_PRI, PCI_EXT_CAP_ID_PASID, }; int i, pos; - if (pci_ats_disabled()) + if (!pci_ats_supported(pdev)) return false; - for (i = 0; i < 3; ++i) { + for (i = 0; i < 2; ++i) { pos = pci_find_ext_capability(pdev, caps[i]); if (pos == 0) return false; @@ -3150,11 +3149,8 @@ int amd_iommu_device_info(struct pci_dev *pdev, memset(info, 0, sizeof(*info)); - if (!pci_ats_disabled()) { - pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS); - if (pos) - info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP; - } + if (pci_ats_supported(pdev)) + info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP; pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); if (pos)