From patchwork Tue Dec 6 18:28:12 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kirti Wankhede X-Patchwork-Id: 703298 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3tY9Dk0b43z9sBR for ; Wed, 7 Dec 2016 05:31:02 +1100 (AEDT) Received: from localhost ([::1]:33932 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cEKW4-0002rN-1o for incoming@patchwork.ozlabs.org; Tue, 06 Dec 2016 13:31:00 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52704) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cEKS3-0000WW-BM for qemu-devel@nongnu.org; Tue, 06 Dec 2016 13:26:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cEKRy-0003X4-A4 for qemu-devel@nongnu.org; Tue, 06 Dec 2016 13:26:51 -0500 Received: from hqemgate15.nvidia.com ([216.228.121.64]:9233) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cEKRy-0003WR-4y for qemu-devel@nongnu.org; Tue, 06 Dec 2016 13:26:46 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com id ; Tue, 06 Dec 2016 09:45:24 -0800 Received: from HQMAIL105.nvidia.com ([172.20.13.39]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 06 Dec 2016 10:26:43 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 06 Dec 2016 10:26:43 -0800 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 6 Dec 2016 18:26:44 +0000 Received: from kwankhede-dev.nvidia.com (172.20.13.39) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1210.3 via Frontend Transport; Tue, 6 Dec 2016 18:26:41 +0000 From: Kirti Wankhede To: , , , Date: Tue, 6 Dec 2016 23:58:12 +0530 Message-ID: <1481048892-29881-1-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1481044425-23920-1-git-send-email-kwankhede@nvidia.com> References: <1481044425-23920-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 216.228.121.64 Subject: [Qemu-devel] [PATCH v2 2/2] vfio iommu: Fix size argument to vfio_find_dma() in pin_pages/unpin_pages X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kirti Wankhede , qemu-devel@nongnu.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Passing zero for the size to vfio_find_dma() isn't compatible with matching the start address of an existing vfio_dma. Doing so triggers a corner case. In vfio_find_dma(), when the start address is equal to dma->iova and size is 0, check for the end of search range makes it to take wrong side of RB-tree. That fails the search even though the address is present in mapped dma ranges. In functions pin_pages and unpin_pages, the iova which is being searched is base address of page to be pinned or unpinned. So here size should be set to PAGE_SIZE, as argument to vfio_find_dma(). Signed-off-by: Kirti Wankhede Signed-off-by: Neo Jia --- drivers/vfio/vfio_iommu_type1.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 8e9e94ccb2ff..023fba7b8d5a 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -581,7 +581,7 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data, struct vfio_pfn *vpfn; iova = user_pfn[i] << PAGE_SHIFT; - dma = vfio_find_dma(iommu, iova, 0); + dma = vfio_find_dma(iommu, iova, PAGE_SIZE); if (!dma) { ret = -EINVAL; goto pin_unwind; @@ -622,7 +622,7 @@ pin_unwind: dma_addr_t iova; iova = user_pfn[j] << PAGE_SHIFT; - dma = vfio_find_dma(iommu, iova, 0); + dma = vfio_find_dma(iommu, iova, PAGE_SIZE); vfio_unpin_page_external(dma, iova, do_accounting); phys_pfn[j] = 0; } @@ -659,7 +659,7 @@ static int vfio_iommu_type1_unpin_pages(void *iommu_data, dma_addr_t iova; iova = user_pfn[i] << PAGE_SHIFT; - dma = vfio_find_dma(iommu, iova, 0); + dma = vfio_find_dma(iommu, iova, PAGE_SIZE); if (!dma) goto unpin_exit; vfio_unpin_page_external(dma, iova, do_accounting);