From patchwork Tue Jan 26 13:12:48 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 8121641 Return-Path: X-Original-To: patchwork-kvm@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 936BA9F6DA for ; Tue, 26 Jan 2016 13:14:36 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8959920270 for ; Tue, 26 Jan 2016 13:14:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5FABB2026D for ; Tue, 26 Jan 2016 13:14:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965641AbcAZNOb (ORCPT ); Tue, 26 Jan 2016 08:14:31 -0500 Received: from mail-wm0-f44.google.com ([74.125.82.44]:36677 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965947AbcAZNNt (ORCPT ); Tue, 26 Jan 2016 08:13:49 -0500 Received: by mail-wm0-f44.google.com with SMTP id l65so103482803wmf.1 for ; Tue, 26 Jan 2016 05:13:49 -0800 (PST) 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=uGuzlp6SodIb4Q/eBNnflAeh8nushrdxf84SowugS3U=; b=RMuZhdXn18mbmqYNPoHEHWZJvM7W9CazmdCIFDsVocq8DKDxqedtrI76qUnY8WkoU2 07oXqANFjbJLxpPKLqcvLo3XhCH5vAhBNc/jUHh1hZ3F87cYBc31540aTqLr1pJSTxPA LP2qXPpgnFOj3PSy7N5EumnbAgIGLsSqz0qzE= 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=uGuzlp6SodIb4Q/eBNnflAeh8nushrdxf84SowugS3U=; b=TmgPU9R0W0c+6YPDFWpG9n5n0+8pbnXB2ZttFbVPN3EKhFUB4Tv+ciKRbaB0DnWo08 N3ssIKku3G3gApEdzvMoeOYgk0UbVz3+KzgnOHt/SppjW+EOur4s5R1+/hapkhBQ3hfO 20lsCi+8e0auf7VWWhrl+UcZAYB0BB+Aq9FGuYGw7igWBjs/xWijiKXafQsdhgKKRV3d WBOiVy01JtbIqfVlfC6f0fgJzowj0XHy5taBoQ673Z2uufTmFS6801upYyqDXUM/0vP8 ofFfW/KGIOLXOHjeE6e5hAkXvaQfh4uCmYhTunnuq+4BegWnMcQD9oZnafVk+Ur0o2D9 OMmg== X-Gm-Message-State: AG10YOR4q3r0w+8mn2y/RwjUYOuFR4n7Iir6n+PjuUZlVmdClyK04+LTNpupTdPrXA7318ZR X-Received: by 10.194.5.193 with SMTP id u1mr22633699wju.166.1453814028391; Tue, 26 Jan 2016 05:13:48 -0800 (PST) Received: from localhost.localdomain (LMontsouris-657-1-37-90.w80-11.abo.wanadoo.fr. [80.11.198.90]) by smtp.gmail.com with ESMTPSA id ct2sm1388885wjb.46.2016.01.26.05.13.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 26 Jan 2016 05:13:46 -0800 (PST) From: Eric Auger To: eric.auger@st.com, eric.auger@linaro.org, alex.williamson@redhat.com, will.deacon@arm.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Bharat.Bhushan@freescale.com, pranav.sawargaonkar@gmail.com, p.fedin@samsung.com, suravee.suthikulpanit@amd.com, linux-kernel@vger.kernel.org, patches@linaro.org, iommu@lists.linux-foundation.org Subject: [PATCH 10/10] vfio: allow the user to register reserved iova range for MSI mapping Date: Tue, 26 Jan 2016 13:12:48 +0000 Message-Id: <1453813968-2024-11-git-send-email-eric.auger@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1453813968-2024-1-git-send-email-eric.auger@linaro.org> References: <1453813968-2024-1-git-send-email-eric.auger@linaro.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,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 The user is allowed to register a reserved IOVA range by using the DMA MAP API and setting the new flag: VFIO_DMA_MAP_FLAG_MSI_RESERVED_IOVA. It provides the base address and the size. This region is stored in the vfio_dma rb tree. At that point the iova range is not mapped to any target address yet. The host kernel will use those iova when needed, typically when the VFIO-PCI device allocates its MSI's. This patch also handles the destruction of the reserved binding RB-tree and domain's iova_domains. Signed-off-by: Eric Auger Signed-off-by: Bharat Bhushan --- - Currently the user is not yet informed about the number of pages to provide RFC v1 -> RFC v2: - takes into account Alex comments, based on [RFC PATCH 1/6] vfio: Add interface for add/del reserved iova region: - use the existing dma map/unmap ioctl interface with a flag to register a reserved IOVA range. A single reserved iova region is allowed. --- drivers/vfio/vfio_iommu_type1.c | 98 ++++++++++++++++++++++++++++++++++++++++- include/uapi/linux/vfio.h | 9 ++++ 2 files changed, 106 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 2f085d3..37c7d78 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -538,10 +538,40 @@ static void vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma) vfio_lock_acct(-unlocked); } +/* vfio_unmap_reserved: unmap and free all reserved binding nodes + * for all domains and destroy their iova_domain + * + * @iommu: iommu handle + */ +static void vfio_unmap_reserved(struct vfio_iommu *iommu) +{ + struct vfio_domain *d; + + list_for_each_entry(d, &iommu->domain_list, next) { + struct rb_node *node; + + while ((node = rb_first(&d->reserved_binding_list))) { + struct vfio_reserved_binding *b = + rb_entry(node, + struct vfio_reserved_binding, node); + + while (!kref_put(&b->kref, + vfio_reserved_binding_release)) { + } + } + d->reserved_binding_list = RB_ROOT; + + put_iova_domain(d->reserved_iova_domain); + kfree(d->reserved_iova_domain); + } +} + static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma) { if (likely(dma->type != VFIO_IOVA_RESERVED)) vfio_unmap_unpin(iommu, dma); + else + vfio_unmap_reserved(iommu); vfio_unlink_dma(iommu, dma); kfree(dma); } @@ -785,6 +815,68 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu, return ret; } +static int vfio_register_reserved_iova_range(struct vfio_iommu *iommu, + struct vfio_iommu_type1_dma_map *map) +{ + dma_addr_t iova = map->iova; + size_t size = map->size; + uint64_t mask; + struct vfio_dma *dma; + int ret = 0; + struct vfio_domain *d; + unsigned long order; + + /* Verify that none of our __u64 fields overflow */ + if (map->size != size || map->iova != iova) + return -EINVAL; + + order = __ffs(vfio_pgsize_bitmap(iommu)); + mask = ((uint64_t)1 << order) - 1; + + WARN_ON(mask & PAGE_MASK); + + /* we currently only support MSI_RESERVED_IOVA */ + if (!(map->flags & VFIO_DMA_MAP_FLAG_MSI_RESERVED_IOVA)) + return -EINVAL; + + if (!size || (size | iova) & mask) + return -EINVAL; + + /* Don't allow IOVA address wrap */ + if (iova + size - 1 < iova) + return -EINVAL; + + mutex_lock(&iommu->lock); + + /* check if the iova domain has not been instantiated already*/ + d = list_first_entry(&iommu->domain_list, + struct vfio_domain, next); + + if (d->reserved_iova_domain || vfio_find_dma(iommu, iova, size)) { + ret = -EEXIST; + goto out; + } + + dma = kzalloc(sizeof(*dma), GFP_KERNEL); + if (!dma) { + ret = -ENOMEM; + goto out; + } + + dma->iova = iova; + dma->size = size; + dma->type = VFIO_IOVA_RESERVED; + + vfio_link_dma(iommu, dma); + + list_for_each_entry(d, &iommu->domain_list, next) + alloc_reserved_iova_domain(d, iova, size, order); + +out: + mutex_unlock(&iommu->lock); + return ret; +} + static int vfio_bus_type(struct device *dev, void *data) { struct bus_type **bus = data; @@ -1297,7 +1389,8 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, } else if (cmd == VFIO_IOMMU_MAP_DMA) { struct vfio_iommu_type1_dma_map map; uint32_t mask = VFIO_DMA_MAP_FLAG_READ | - VFIO_DMA_MAP_FLAG_WRITE; + VFIO_DMA_MAP_FLAG_WRITE | + VFIO_DMA_MAP_FLAG_MSI_RESERVED_IOVA; minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); @@ -1307,6 +1400,9 @@ static long vfio_iommu_type1_ioctl(void *iommu_data, if (map.argsz < minsz || map.flags & ~mask) return -EINVAL; + if (map.flags & VFIO_DMA_MAP_FLAG_MSI_RESERVED_IOVA) + return vfio_register_reserved_iova_range(iommu, &map); + return vfio_dma_do_map(iommu, &map); } else if (cmd == VFIO_IOMMU_UNMAP_DMA) { diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index 43e183b..982e326 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -411,12 +411,21 @@ struct vfio_iommu_type1_info { * * Map process virtual addresses to IO virtual addresses using the * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required. + * + * In case MSI_RESERVED_IOVA is set, the API only aims at registering an IOVA + * region which will be used on some platforms to map the host MSI frame. + * in that specific case, vaddr and prot are ignored. The requirement for + * provisioning such IOVA range can be checked by calling VFIO_IOMMU_GET_INFO + * with the VFIO_IOMMU_INFO_REQUIRE_MSI_MAP attribute. A single + * MSI_RESERVED_IOVA region can be registered */ struct vfio_iommu_type1_dma_map { __u32 argsz; __u32 flags; #define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from device */ #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */ +/* reserved iova for MSI vectors*/ +#define VFIO_DMA_MAP_FLAG_MSI_RESERVED_IOVA (1 << 2) __u64 vaddr; /* Process virtual address */ __u64 iova; /* IO virtual address */ __u64 size; /* Size of mapping (bytes) */