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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1923C433F5 for ; Wed, 5 Oct 2022 17:48:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230507AbiJERsx (ORCPT ); Wed, 5 Oct 2022 13:48:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229901AbiJERsg (ORCPT ); Wed, 5 Oct 2022 13:48:36 -0400 Received: from mail-ej1-x636.google.com (mail-ej1-x636.google.com [IPv6:2a00:1450:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2997A24D for ; Wed, 5 Oct 2022 10:48:35 -0700 (PDT) Received: by mail-ej1-x636.google.com with SMTP id bj12so37036946ejb.13 for ; Wed, 05 Oct 2022 10:48:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=lUqPpYv5HbJS3RJZgdTtH5zBJM8cF/Q/yQo70/LIPGg=; b=q2NAXUerg5Qq4svf9ZBclqSa7jhIsyyWtisVfdHoR09jVE9TUdLqPM4efflTILBJ2E 1QzruERT96PZYju0r7C2ZaHvg30mr5WuMueOXGd/ZwvoZmmuOUN13WUjo0E1wd+IbDqs BHtddK4HNWj9DlWucI/LF6hcSCBL5vdIlYwIr7rf7LHwpwKw1u0JzBn48GS4yFmoiv+C BXfd99AdwgNOMIo8PqFDtYXynE8wj8nj18ErlAFmAjYKe4avYXwKc2MTtpfsUUJ0Hr+d nyJcbqw+4Yt20d6Zxo8CDJDZfh2dhLrWeY1cgcrGP5JOqbkMqzLlOTlOQlgFouD46h6r MMng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=lUqPpYv5HbJS3RJZgdTtH5zBJM8cF/Q/yQo70/LIPGg=; b=e8iVVSl+Z6082WT15Hs5ZxRfQzat2STbEA86rZBA9MWYsNjPIR98zxoXlT+b+m9zYs bMlP4VKwgfMUTyjR2teJYHUd+fozAxTs0Rk/3de16cTcMGemsOpq2k4yzMZjOhh9/5b/ tbRsE/UUSChSyPLox6ce02riVngTs+6PgO3HHZF9d9dz/tNwFsyEr+lszZtuLVDD/wIr ONlrUKLeaZz6whFs+wV4gJHlJsjSlSl5+m7ccCcT2pTXF/GDRYefW50zBBA3gyysrRiw kY9C4dqIG5afT/655rKTnWX5mGS5X+mFt2PZrPch60vuYB5s5NNkh6KCThzbLThmMFo5 YQ3A== X-Gm-Message-State: ACrzQf3NwwdrdIhpGhfsxoZrMb50A9gfcbYfdeccdpRJMUHbfgmTJeeM GtmKZW4N6bO/JLxpjK4kahQ= X-Google-Smtp-Source: AMsMyM7qFxTtDClHub9HwGnUCHbj0K2B+uD3aLcbrl4tDcKrhmWQ/TdQGfyyThVB1O4Bfc/Y82Eqaw== X-Received: by 2002:a17:906:4ac1:b0:780:3448:ff06 with SMTP id u1-20020a1709064ac100b007803448ff06mr587283ejt.403.1664992113581; Wed, 05 Oct 2022 10:48:33 -0700 (PDT) Received: from otyshchenko.router ([212.22.223.21]) by smtp.gmail.com with ESMTPSA id ee32-20020a056402292000b0044e7862ab3fsm4320697edb.7.2022.10.05.10.48.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Oct 2022 10:48:32 -0700 (PDT) From: Oleksandr Tyshchenko To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org Cc: Oleksandr Tyshchenko , Stefano Stabellini , Juergen Gross Subject: [PATCH 1/2] xen/virtio: Fix n_pages calculation in xen_grant_dma_map(unmap)_page() Date: Wed, 5 Oct 2022 20:48:22 +0300 Message-Id: <20221005174823.1800761-2-olekstysh@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221005174823.1800761-1-olekstysh@gmail.com> References: <20221005174823.1800761-1-olekstysh@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oleksandr Tyshchenko Take page offset into the account when calculating the number of pages to be granted. Signed-off-by: Oleksandr Tyshchenko Fixes: d6aca3504c7d ("xen/grant-dma-ops: Add option to restrict memory access under Xen") --- drivers/xen/grant-dma-ops.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c index 8973fc1e9ccc..1998d0e8ce82 100644 --- a/drivers/xen/grant-dma-ops.c +++ b/drivers/xen/grant-dma-ops.c @@ -153,7 +153,7 @@ static dma_addr_t xen_grant_dma_map_page(struct device *dev, struct page *page, unsigned long attrs) { struct xen_grant_dma_data *data; - unsigned int i, n_pages = PFN_UP(size); + unsigned int i, n_pages = PFN_UP(offset + size); grant_ref_t grant; dma_addr_t dma_handle; @@ -185,7 +185,8 @@ static void xen_grant_dma_unmap_page(struct device *dev, dma_addr_t dma_handle, unsigned long attrs) { struct xen_grant_dma_data *data; - unsigned int i, n_pages = PFN_UP(size); + unsigned long offset = dma_handle & (PAGE_SIZE - 1); + unsigned int i, n_pages = PFN_UP(offset + size); grant_ref_t grant; if (WARN_ON(dir == DMA_NONE)) -- 2.25.1