From patchwork Wed Mar 18 19:41:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kirti Wankhede X-Patchwork-Id: 11445885 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 71D2A6CA for ; Wed, 18 Mar 2020 20:15:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5189F2077A for ; Wed, 18 Mar 2020 20:15:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="LzngNYYN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726980AbgCRUPG (ORCPT ); Wed, 18 Mar 2020 16:15:06 -0400 Received: from hqnvemgate26.nvidia.com ([216.228.121.65]:19274 "EHLO hqnvemgate26.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726975AbgCRUPG (ORCPT ); Wed, 18 Mar 2020 16:15:06 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 18 Mar 2020 13:14:52 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Wed, 18 Mar 2020 13:15:05 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Wed, 18 Mar 2020 13:15:05 -0700 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 18 Mar 2020 20:15:05 +0000 Received: from kwankhede-dev.nvidia.com (10.124.1.5) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 18 Mar 2020 20:14:59 +0000 From: Kirti Wankhede To: , CC: , , , , , , , , , , , , , , , , , , , , "Kirti Wankhede" Subject: [PATCH v14 Kernel 3/7] vfio iommu: Add ioctl definition for dirty pages tracking. Date: Thu, 19 Mar 2020 01:11:10 +0530 Message-ID: <1584560474-19946-4-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1584560474-19946-1-git-send-email-kwankhede@nvidia.com> References: <1584560474-19946-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1584562492; bh=pt1cVCAG/c0c3REQWs6r6IoVyGjSnKzIxXPhylbnVBU=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=LzngNYYNUME2kboaBLTeMH+kgGmOI82HW0hgBO2KX5rS6/I7wg0+BWjw/iDQK9lA7 By9A9yRfU71vpiQTg9u6N7mB+t9j9C3RZ/oUjQ4CEGN8GzbXto6AOf94dw6xWtETyA uleRVnNKGjSSNPNqWmh9EkJII0dEVQ4TPPSli2JK7bbdouHCA/x+CWZ/zUSdokDILI fD5rM/SosZMiXDuTEb++2ypKJ1EucK37+Tl6T5geiMp+UgyusJC+q04su5OJZhdJjV Xjxl3Nw3qsWKGg6JPy6XaW/LK60szK4UbuFzb3qVrESWLoMUeOrWRM/g71it5xKVVh iqzGBj1LFNzNQ== Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org IOMMU container maintains a list of all pages pinned by vfio_pin_pages API. All pages pinned by vendor driver through this API should be considered as dirty during migration. When container consists of IOMMU capable device and all pages are pinned and mapped, then all pages are marked dirty. Added support to start/stop pinned and unpinned pages tracking and to get bitmap of all dirtied pages for requested IO virtual address range. Signed-off-by: Kirti Wankhede Reviewed-by: Neo Jia --- include/uapi/linux/vfio.h | 55 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index d0021467af53..043e9eafb255 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -995,6 +995,12 @@ struct vfio_iommu_type1_dma_map { #define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13) +struct vfio_bitmap { + __u64 pgsize; /* page size for bitmap */ + __u64 size; /* in bytes */ + __u64 __user *data; /* one bit per page */ +}; + /** * VFIO_IOMMU_UNMAP_DMA - _IOWR(VFIO_TYPE, VFIO_BASE + 14, * struct vfio_dma_unmap) @@ -1021,6 +1027,55 @@ struct vfio_iommu_type1_dma_unmap { #define VFIO_IOMMU_ENABLE _IO(VFIO_TYPE, VFIO_BASE + 15) #define VFIO_IOMMU_DISABLE _IO(VFIO_TYPE, VFIO_BASE + 16) +/** + * VFIO_IOMMU_DIRTY_PAGES - _IOWR(VFIO_TYPE, VFIO_BASE + 17, + * struct vfio_iommu_type1_dirty_bitmap) + * IOCTL is used for dirty pages tracking. Caller sets argsz, which is size of + * struct vfio_iommu_type1_dirty_bitmap. Caller set flag depend on which + * operation to perform, details as below: + * + * When IOCTL is called with VFIO_IOMMU_DIRTY_PAGES_FLAG_START set, indicates + * migration is active and IOMMU module should track pages which are pinned and + * could be dirtied by device. + * Dirty pages are tracked until tracking is stopped by user application by + * setting VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP flag. + * + * When IOCTL is called with VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP set, indicates + * IOMMU should stop tracking pinned pages. + * + * When IOCTL is called with VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP flag set, + * IOCTL returns dirty pages bitmap for IOMMU container during migration for + * given IOVA range. User must provide data[] as the structure + * vfio_iommu_type1_dirty_bitmap_get through which user provides IOVA range and + * pgsize. This interface supports to get bitmap of smallest supported pgsize + * only and can be modified in future to get bitmap of specified pgsize. + * User must allocate memory for bitmap, zero the bitmap memory and set size + * of allocated memory in bitmap_size field. One bit is used to represent one + * page consecutively starting from iova offset. User should provide page size + * in 'pgsize'. Bit set in bitmap indicates page at that offset from iova is + * dirty. Caller must set argsz including size of structure + * vfio_iommu_type1_dirty_bitmap_get. + * + * Only one flag should be set at a time. + * + */ +struct vfio_iommu_type1_dirty_bitmap { + __u32 argsz; + __u32 flags; +#define VFIO_IOMMU_DIRTY_PAGES_FLAG_START (1 << 0) +#define VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP (1 << 1) +#define VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP (1 << 2) + __u8 data[]; +}; + +struct vfio_iommu_type1_dirty_bitmap_get { + __u64 iova; /* IO virtual address */ + __u64 size; /* Size of iova range */ + struct vfio_bitmap bitmap; +}; + +#define VFIO_IOMMU_DIRTY_PAGES _IO(VFIO_TYPE, VFIO_BASE + 17) + /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */ /*