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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 B7062C433E3 for ; Thu, 20 Aug 2020 00:13:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 912E22075E for ; Thu, 20 Aug 2020 00:13:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597882381; bh=/S/5fcNXp1qF0dj5Sh7EBvrVNQQbog7E1B1vZS/c6vk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=M0QvC/hd2xNumwCogZxHxCNhiB/5iQ8o9eP6CemKxYsEvKqQy7IxK5Og8Kk9ox83l YkbBLdhIF0AiDfsm8nM+uK4eAYz4yd2U4S/lHaNOtWLYXX0IU17tZOCOGnwoqfBP+m kcfroOO6aAamXYygoz3VoNEc/FLzvRF8xxdA1lks= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728560AbgHTAM7 (ORCPT ); Wed, 19 Aug 2020 20:12:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:57520 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726938AbgHTABl (ORCPT ); Wed, 19 Aug 2020 20:01:41 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 22CF621775; Thu, 20 Aug 2020 00:01:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597881701; bh=/S/5fcNXp1qF0dj5Sh7EBvrVNQQbog7E1B1vZS/c6vk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UL8pE1I4ZQDqAImmRtg4skD02jMIjFvneVDTdLfMYuOJeQ/nKjqUSFDKZDJR0rHbP +1aRDNmqMwNpckqtGIl8R0HA5YeksLdEE04yTMtuCzwJYEV1TW/DonTAubE2N/iv7E O8D9JnWlGGkYR9tExbA0JAy2Rxf6aJJuP2Nga9jY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Boris Ostrovsky , Stefano Stabellini , Corey Minyard , Roman Shaposhnik , Juergen Gross , Sasha Levin , xen-devel@lists.xenproject.org, iommu@lists.linux-foundation.org Subject: [PATCH AUTOSEL 5.8 18/27] swiotlb-xen: use vmalloc_to_page on vmalloc virt addresses Date: Wed, 19 Aug 2020 20:01:07 -0400 Message-Id: <20200820000116.214821-18-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200820000116.214821-1-sashal@kernel.org> References: <20200820000116.214821-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Boris Ostrovsky [ Upstream commit 8b1e868f66076490189a36d984fcce286cdd6295 ] xen_alloc_coherent_pages might return pages for which virt_to_phys and virt_to_page don't work, e.g. ioremap'ed pages. So in xen_swiotlb_free_coherent we can't assume that virt_to_page works. Instead add a is_vmalloc_addr check and use vmalloc_to_page on vmalloc virt addresses. This patch fixes the following crash at boot on RPi4 (the underlying issue is not RPi4 specific): https://marc.info/?l=xen-devel&m=158862573216800 Signed-off-by: Boris Ostrovsky Signed-off-by: Stefano Stabellini Reviewed-by: Boris Ostrovsky Tested-by: Corey Minyard Tested-by: Roman Shaposhnik Link: https://lore.kernel.org/r/20200710223427.6897-1-sstabellini@kernel.org Signed-off-by: Juergen Gross Signed-off-by: Sasha Levin --- drivers/xen/swiotlb-xen.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index b6d27762c6f8c..5fbadd07819bd 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -335,6 +335,7 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, int order = get_order(size); phys_addr_t phys; u64 dma_mask = DMA_BIT_MASK(32); + struct page *page; if (hwdev && hwdev->coherent_dma_mask) dma_mask = hwdev->coherent_dma_mask; @@ -346,9 +347,14 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, /* Convert the size to actually allocated. */ size = 1UL << (order + XEN_PAGE_SHIFT); + if (is_vmalloc_addr(vaddr)) + page = vmalloc_to_page(vaddr); + else + page = virt_to_page(vaddr); + if (!WARN_ON((dev_addr + size - 1 > dma_mask) || range_straddles_page_boundary(phys, size)) && - TestClearPageXenRemapped(virt_to_page(vaddr))) + TestClearPageXenRemapped(page)) xen_destroy_contiguous_region(phys, order); xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs); -- 2.25.1