From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A3ADC07E9C for ; Mon, 12 Jul 2021 09:04:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D0CE6101E for ; Mon, 12 Jul 2021 09:04:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1384529AbhGLJD5 (ORCPT ); Mon, 12 Jul 2021 05:03:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:54952 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1353906AbhGLIDH (ORCPT ); Mon, 12 Jul 2021 04:03:07 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7827761D16; Mon, 12 Jul 2021 07:58:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626076714; bh=GIyXflxJp6TC+5ZZ1GIE532hLKZYcLVKPssqc0wh0j4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ck/Mvkov0o/qffkQndLmUhQ4TevhLNy7+XXR3QjV6ZMB1/C/5PceWHoR6tRW5udbr k0cmmebwuD6m75e1keynMErsuJWisXwpZ0jZ7MPHkvkqlkaizg50ZD9c07QJLG1lFr EW5llZLD6BRBfKKTp2qDphBb3Euhnbe7HGZ0FQtc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zeng Tao , Alex Williamson , Sasha Levin Subject: [PATCH 5.13 763/800] vfio/pci: Handle concurrent vma faults Date: Mon, 12 Jul 2021 08:13:06 +0200 Message-Id: <20210712061047.959261414@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060912.995381202@linuxfoundation.org> References: <20210712060912.995381202@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alex Williamson [ Upstream commit 6a45ece4c9af473555f01f0f8b97eba56e3c7d0d ] io_remap_pfn_range() will trigger a BUG_ON if it encounters a populated pte within the mapping range. This can occur because we map the entire vma on fault and multiple faults can be blocked behind the vma_lock. This leads to traces like the one reported below. We can use our vma_list to test whether a given vma is mapped to avoid this issue. [ 1591.733256] kernel BUG at mm/memory.c:2177! [ 1591.739515] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 1591.747381] Modules linked in: vfio_iommu_type1 vfio_pci vfio_virqfd vfio pv680_mii(O) [ 1591.760536] CPU: 2 PID: 227 Comm: lcore-worker-2 Tainted: G O 5.11.0-rc3+ #1 [ 1591.770735] Hardware name: , BIOS HixxxxFPGA 1P B600 V121-1 [ 1591.778872] pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--) [ 1591.786134] pc : remap_pfn_range+0x214/0x340 [ 1591.793564] lr : remap_pfn_range+0x1b8/0x340 [ 1591.799117] sp : ffff80001068bbd0 [ 1591.803476] x29: ffff80001068bbd0 x28: 0000042eff6f0000 [ 1591.810404] x27: 0000001100910000 x26: 0000001300910000 [ 1591.817457] x25: 0068000000000fd3 x24: ffffa92f1338e358 [ 1591.825144] x23: 0000001140000000 x22: 0000000000000041 [ 1591.832506] x21: 0000001300910000 x20: ffffa92f141a4000 [ 1591.839520] x19: 0000001100a00000 x18: 0000000000000000 [ 1591.846108] x17: 0000000000000000 x16: ffffa92f11844540 [ 1591.853570] x15: 0000000000000000 x14: 0000000000000000 [ 1591.860768] x13: fffffc0000000000 x12: 0000000000000880 [ 1591.868053] x11: ffff0821bf3d01d0 x10: ffff5ef2abd89000 [ 1591.875932] x9 : ffffa92f12ab0064 x8 : ffffa92f136471c0 [ 1591.883208] x7 : 0000001140910000 x6 : 0000000200000000 [ 1591.890177] x5 : 0000000000000001 x4 : 0000000000000001 [ 1591.896656] x3 : 0000000000000000 x2 : 0168044000000fd3 [ 1591.903215] x1 : ffff082126261880 x0 : fffffc2084989868 [ 1591.910234] Call trace: [ 1591.914837] remap_pfn_range+0x214/0x340 [ 1591.921765] vfio_pci_mmap_fault+0xac/0x130 [vfio_pci] [ 1591.931200] __do_fault+0x44/0x12c [ 1591.937031] handle_mm_fault+0xcc8/0x1230 [ 1591.942475] do_page_fault+0x16c/0x484 [ 1591.948635] do_translation_fault+0xbc/0xd8 [ 1591.954171] do_mem_abort+0x4c/0xc0 [ 1591.960316] el0_da+0x40/0x80 [ 1591.965585] el0_sync_handler+0x168/0x1b0 [ 1591.971608] el0_sync+0x174/0x180 [ 1591.978312] Code: eb1b027f 540000c0 f9400022 b4fffe02 (d4210000) Fixes: 11c4cd07ba11 ("vfio-pci: Fault mmaps to enable vma tracking") Reported-by: Zeng Tao Suggested-by: Zeng Tao Link: https://lore.kernel.org/r/162497742783.3883260.3282953006487785034.stgit@omen Signed-off-by: Alex Williamson Signed-off-by: Sasha Levin --- drivers/vfio/pci/vfio_pci.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index bd7c482c948a..b94958552eb8 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -1594,6 +1594,7 @@ static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct vfio_pci_device *vdev = vma->vm_private_data; + struct vfio_pci_mmap_vma *mmap_vma; vm_fault_t ret = VM_FAULT_NOPAGE; mutex_lock(&vdev->vma_lock); @@ -1601,24 +1602,36 @@ static vm_fault_t vfio_pci_mmap_fault(struct vm_fault *vmf) if (!__vfio_pci_memory_enabled(vdev)) { ret = VM_FAULT_SIGBUS; - mutex_unlock(&vdev->vma_lock); goto up_out; } - if (__vfio_pci_add_vma(vdev, vma)) { - ret = VM_FAULT_OOM; - mutex_unlock(&vdev->vma_lock); - goto up_out; + /* + * We populate the whole vma on fault, so we need to test whether + * the vma has already been mapped, such as for concurrent faults + * to the same vma. io_remap_pfn_range() will trigger a BUG_ON if + * we ask it to fill the same range again. + */ + list_for_each_entry(mmap_vma, &vdev->vma_list, vma_next) { + if (mmap_vma->vma == vma) + goto up_out; } - mutex_unlock(&vdev->vma_lock); - if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, - vma->vm_end - vma->vm_start, vma->vm_page_prot)) + vma->vm_end - vma->vm_start, + vma->vm_page_prot)) { ret = VM_FAULT_SIGBUS; + zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start); + goto up_out; + } + + if (__vfio_pci_add_vma(vdev, vma)) { + ret = VM_FAULT_OOM; + zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start); + } up_out: up_read(&vdev->memory_lock); + mutex_unlock(&vdev->vma_lock); return ret; } -- 2.30.2