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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 254C8C2BB40 for ; Thu, 10 Dec 2020 07:35:51 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BFB1823A7C for ; Thu, 10 Dec 2020 07:35:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BFB1823A7C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 7936D87888; Thu, 10 Dec 2020 07:35:50 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nkPQsndErJXo; Thu, 10 Dec 2020 07:35:49 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id A513487891; Thu, 10 Dec 2020 07:35:49 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 9B2CEC1D9F; Thu, 10 Dec 2020 07:35:49 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 062F0C1D9F for ; Thu, 10 Dec 2020 07:35:47 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id E2A1787613 for ; Thu, 10 Dec 2020 07:35:46 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qGeUtU9swca3 for ; Thu, 10 Dec 2020 07:35:44 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) by fraxinus.osuosl.org (Postfix) with ESMTPS id 545F3872BB for ; Thu, 10 Dec 2020 07:35:43 +0000 (UTC) Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4Cs5Kg6N1tz7CCB; Thu, 10 Dec 2020 15:35:03 +0800 (CST) Received: from DESKTOP-5IS4806.china.huawei.com (10.174.187.37) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.487.0; Thu, 10 Dec 2020 15:35:25 +0800 From: Keqian Zhu To: , , , , , Alex Williamson , Cornelia Huck , Marc Zyngier , Will Deacon , Robin Murphy Subject: [PATCH 1/7] vfio: iommu_type1: Clear added dirty bit when unwind pin Date: Thu, 10 Dec 2020 15:34:19 +0800 Message-ID: <20201210073425.25960-2-zhukeqian1@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20201210073425.25960-1-zhukeqian1@huawei.com> References: <20201210073425.25960-1-zhukeqian1@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.187.37] X-CFilter-Loop: Reflected Cc: Suzuki K Poulose , Catalin Marinas , jiangkunkun@huawei.com, Sean Christopherson , Alexios Zavras , Mark Brown , James Morse , wanghaibin.wang@huawei.com, Thomas Gleixner , Keqian Zhu , Andrew Morton , Julien Thierry X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Currently we do not clear added dirty bit of bitmap when unwind pin, so if pin failed at halfway, we set unnecessary dirty bit in bitmap. Clearing added dirty bit when unwind pin, userspace will see less dirty page, which can save much time to handle them. Note that we should distinguish the bits added by pin and the bits already set before pin, so introduce bitmap_added to record this. Signed-off-by: Keqian Zhu --- drivers/vfio/vfio_iommu_type1.c | 33 ++++++++++++++++++++++----------- 1 file changed, 22 insertions(+), 11 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 67e827638995..f129d24a6ec3 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -637,7 +637,11 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data, struct vfio_iommu *iommu = iommu_data; struct vfio_group *group; int i, j, ret; + unsigned long pgshift = __ffs(iommu->pgsize_bitmap); unsigned long remote_vaddr; + unsigned long bitmap_offset; + unsigned long *bitmap_added; + dma_addr_t iova; struct vfio_dma *dma; bool do_accounting; @@ -650,6 +654,12 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data, mutex_lock(&iommu->lock); + bitmap_added = bitmap_zalloc(npage, GFP_KERNEL); + if (!bitmap_added) { + ret = -ENOMEM; + goto pin_done; + } + /* Fail if notifier list is empty */ if (!iommu->notifier.head) { ret = -EINVAL; @@ -664,7 +674,6 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data, do_accounting = !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu); for (i = 0; i < npage; i++) { - dma_addr_t iova; struct vfio_pfn *vpfn; iova = user_pfn[i] << PAGE_SHIFT; @@ -699,14 +708,10 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data, } if (iommu->dirty_page_tracking) { - unsigned long pgshift = __ffs(iommu->pgsize_bitmap); - - /* - * Bitmap populated with the smallest supported page - * size - */ - bitmap_set(dma->bitmap, - (iova - dma->iova) >> pgshift, 1); + /* Populated with the smallest supported page size */ + bitmap_offset = (iova - dma->iova) >> pgshift; + if (!test_and_set_bit(bitmap_offset, dma->bitmap)) + set_bit(i, bitmap_added); } } ret = i; @@ -722,14 +727,20 @@ static int vfio_iommu_type1_pin_pages(void *iommu_data, pin_unwind: phys_pfn[i] = 0; for (j = 0; j < i; j++) { - dma_addr_t iova; - iova = user_pfn[j] << PAGE_SHIFT; dma = vfio_find_dma(iommu, iova, PAGE_SIZE); vfio_unpin_page_external(dma, iova, do_accounting); phys_pfn[j] = 0; + + if (test_bit(j, bitmap_added)) { + bitmap_offset = (iova - dma->iova) >> pgshift; + clear_bit(bitmap_offset, dma->bitmap); + } } pin_done: + if (bitmap_added) + bitmap_free(bitmap_added); + mutex_unlock(&iommu->lock); return ret; } -- 2.23.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu