From patchwork Wed May 4 11:54:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 9012831 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 41A869F39D for ; Wed, 4 May 2016 11:57:13 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 52F3D20396 for ; Wed, 4 May 2016 11:57:12 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 70A662039C for ; Wed, 4 May 2016 11:57:11 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1axvP5-0004z9-1M; Wed, 04 May 2016 11:55:43 +0000 Received: from mail-wm0-x234.google.com ([2a00:1450:400c:c09::234]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1axvOW-0003MA-PS for linux-arm-kernel@lists.infradead.org; Wed, 04 May 2016 11:55:10 +0000 Received: by mail-wm0-x234.google.com with SMTP id e201so184505024wme.0 for ; Wed, 04 May 2016 04:54:48 -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; bh=QuRuhABvt06D5ctJmFxu8lubu8bH1JzRwAqZzoQuTa8=; b=gI/rxiZHM++1RtMhWKYxm59XiM/MXfsO7Ow+2niQ0dDoXL+xzGNqwtupnW15LtFg7h DLjb2bJcZVPOmh68q17FnGUqswgEHPwgrrPnhryxDJtOhFBgclhk3xUBOAlFQ4tP+izI FdRICobT20TwmMjOAJgDY87d1gZrQcUlPsxag= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=QuRuhABvt06D5ctJmFxu8lubu8bH1JzRwAqZzoQuTa8=; b=BgD1rkCz7qIXfXOw6rNBYCirTto0Dkd28SOG4Ys4tSbEWjpWDbeTHQDSZdYiEdZwat rFe2p7RRsbUTfIFtLCNlOhWlhc8DL0Z7wVe+nXHbbUMcpuDpn1jyCBgUFMzOm2R3/rQU Q64/yJLGa/Wp/TEBtRzyQMZ3/3CKRoGSNfiKoEGPLl+l/mj/UUV8xuf5AkJllnL01B2p MpeXDVuumnmAY9S2nylgrgbYC3xXUMRapvm4WVYijV6hsCx5DNQId21Cco7dwta8I0IJ aL1HaacjMYoq9BBTA+3H5J4v/xwWB4xv9/K663h+TuWd3xvY9AvAO+9jD8U3/tfxik2h v00Q== X-Gm-Message-State: AOPr4FVDWJyeNE2Ht/Owobo4/eBW75dxUeb6OuK+NZc3enGTaEKxc94qXCBrKgMrsciB8Ypo X-Received: by 10.194.123.102 with SMTP id lz6mr8814888wjb.2.1462362887271; Wed, 04 May 2016 04:54:47 -0700 (PDT) Received: from new-host-61.home (LMontsouris-657-1-37-90.w80-11.abo.wanadoo.fr. [80.11.198.90]) by smtp.gmail.com with ESMTPSA id ck9sm3816623wjc.22.2016.05.04.04.54.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 04 May 2016 04:54:45 -0700 (PDT) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, robin.murphy@arm.com, alex.williamson@redhat.com, will.deacon@arm.com, joro@8bytes.org, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, christoffer.dall@linaro.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v9 5/7] vfio/type1: also check IRQ remapping capability at msi domain Date: Wed, 4 May 2016 11:54:16 +0000 Message-Id: <1462362858-2925-6-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1462362858-2925-1-git-send-email-eric.auger@linaro.org> References: <1462362858-2925-1-git-send-email-eric.auger@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160504_045509_180174_1C736048 X-CRM114-Status: GOOD ( 18.57 ) X-Spam-Score: -2.7 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: julien.grall@arm.com, patches@linaro.org, Jean-Philippe.Brucker@arm.com, p.fedin@samsung.com, linux-kernel@vger.kernel.org, Bharat.Bhushan@freescale.com, iommu@lists.linux-foundation.org, pranav.sawargaonkar@gmail.com, yehuday@marvell.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-6.2 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On x86 IRQ remapping is abstracted by the IOMMU. On ARM this is abstracted by the msi controller. vfio_safe_irq_domain allows to check whether interrupts are "safe" for a given device. They are if the device does not use MSI or if the device uses MSI and the msi-parent controller supports IRQ remapping. Then we check at group level if all devices have safe interrupts: if not, we only allow the group to be attached if allow_unsafe_interrupts is set. At this point ARM sMMU still advertises IOMMU_CAP_INTR_REMAP. This is changed in next patch. Signed-off-by: Eric Auger --- v3 -> v4: - rename vfio_msi_parent_irq_remapping_capable into vfio_safe_irq_domain and irq_remapping into safe_irq_domains v2 -> v3: - protect vfio_msi_parent_irq_remapping_capable with CONFIG_GENERIC_MSI_IRQ_DOMAIN --- drivers/vfio/vfio_iommu_type1.c | 44 +++++++++++++++++++++++++++++++++++++++-- 1 file changed, 42 insertions(+), 2 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 4d3a6f1..2fc8197 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -37,6 +37,8 @@ #include #include #include +#include +#include #define DRIVER_VERSION "0.2" #define DRIVER_AUTHOR "Alex Williamson " @@ -777,6 +779,33 @@ static int vfio_bus_type(struct device *dev, void *data) return 0; } +/** + * vfio_safe_irq_domain: returns whether the irq domain + * the device is attached to is safe with respect to MSI isolation. + * If the irq domain is not an MSI domain, we return it is safe. + * + * @dev: device handle + * @data: unused + * returns 0 if the irq domain is safe, -1 if not. + */ +static int vfio_safe_irq_domain(struct device *dev, void *data) +{ +#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN + struct irq_domain *domain; + struct msi_domain_info *info; + + domain = dev_get_msi_domain(dev); + if (!domain) + return 0; + + info = msi_get_domain_info(domain); + + if (!(info->flags & MSI_FLAG_IRQ_REMAPPING)) + return -1; +#endif + return 0; +} + static int vfio_iommu_replay(struct vfio_iommu *iommu, struct vfio_domain *domain) { @@ -870,7 +899,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, struct vfio_group *group, *g; struct vfio_domain *domain, *d; struct bus_type *bus = NULL; - int ret; + int ret, safe_irq_domains; mutex_lock(&iommu->lock); @@ -893,6 +922,13 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, group->iommu_group = iommu_group; + /* + * Determine if all the devices of the group have a safe irq domain + * with respect to MSI isolation + */ + safe_irq_domains = !iommu_group_for_each_dev(iommu_group, &bus, + vfio_safe_irq_domain); + /* Determine bus_type in order to allocate a domain */ ret = iommu_group_for_each_dev(iommu_group, &bus, vfio_bus_type); if (ret) @@ -920,8 +956,12 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, INIT_LIST_HEAD(&domain->group_list); list_add(&group->next, &domain->group_list); + /* + * to advertise safe interrupts either the IOMMU or the MSI controllers + * must support IRQ remapping/interrupt translation + */ if (!allow_unsafe_interrupts && - !iommu_capable(bus, IOMMU_CAP_INTR_REMAP)) { + (!iommu_capable(bus, IOMMU_CAP_INTR_REMAP) && !safe_irq_domains)) { pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n", __func__); ret = -EPERM;