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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 95DB7C19F3A for ; Mon, 16 Aug 2021 13:09:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D9D26108D for ; Mon, 16 Aug 2021 13:09:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239490AbhHPNJy (ORCPT ); Mon, 16 Aug 2021 09:09:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:58014 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237424AbhHPNGf (ORCPT ); Mon, 16 Aug 2021 09:06:35 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8849E604DC; Mon, 16 Aug 2021 13:06:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1629119164; bh=8gvPxoqCoIWQRbL2Tzvaxx2PVMyQK9HCrI+YZzYU6lc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=11jZRhX3SjbSn4DwiicICB6yP0fLE5Q0/oAnhOAs+o5DjzpBTyJS1kOpyFqOZbZz/ TvjzCwA7KxxmGLI2urN/19jciBT8GrY0Q/Lcv1sNWcRHdeTYeKdubWhh+/2J7umkWT 2DzbEERCMUthjT3adZbPhXKlBC5BfDgiWhUUu9WA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jacek Zloch , Lukasz Sobieraj , "Lee, Chun-Yi" , Krzysztof Rusocki , Damian Bassa , Jeff Moyer , Dan Williams Subject: [PATCH 5.10 17/96] ACPI: NFIT: Fix support for virtual SPA ranges Date: Mon, 16 Aug 2021 15:01:27 +0200 Message-Id: <20210816125435.495948552@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210816125434.948010115@linuxfoundation.org> References: <20210816125434.948010115@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dan Williams commit b93dfa6bda4d4e88e5386490f2b277a26958f9d3 upstream. Fix the NFIT parsing code to treat a 0 index in a SPA Range Structure as a special case and not match Region Mapping Structures that use 0 to indicate that they are not mapped. Without this fix some platform BIOS descriptions of "virtual disk" ranges do not result in the pmem driver attaching to the range. Details: In addition to typical persistent memory ranges, the ACPI NFIT may also convey "virtual" ranges. These ranges are indicated by a UUID in the SPA Range Structure of UUID_VOLATILE_VIRTUAL_DISK, UUID_VOLATILE_VIRTUAL_CD, UUID_PERSISTENT_VIRTUAL_DISK, or UUID_PERSISTENT_VIRTUAL_CD. The critical difference between virtual ranges and UUID_PERSISTENT_MEMORY, is that virtual do not support associations with Region Mapping Structures. For this reason the "index" value of virtual SPA Range Structures is allowed to be 0. If a platform BIOS decides to represent NVDIMMs with disconnected "Region Mapping Structures" (range-index == 0), the kernel may falsely associate them with standalone ranges where the "SPA Range Structure Index" is also zero. When this happens the driver may falsely require labels where "virtual disks" are expected to be label-less. I.e. "label-less" is where the namespace-range == region-range and the pmem driver attaches with no user action to create a namespace. Cc: Jacek Zloch Cc: Lukasz Sobieraj Cc: "Lee, Chun-Yi" Cc: Fixes: c2f32acdf848 ("acpi, nfit: treat virtual ramdisk SPA as pmem region") Reported-by: Krzysztof Rusocki Reported-by: Damian Bassa Reviewed-by: Jeff Moyer Link: https://lore.kernel.org/r/162870796589.2521182.1240403310175570220.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams Signed-off-by: Greg Kroah-Hartman --- drivers/acpi/nfit/core.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -3031,6 +3031,9 @@ static int acpi_nfit_register_region(str struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev; struct nd_mapping_desc *mapping; + /* range index 0 == unmapped in SPA or invalid-SPA */ + if (memdev->range_index == 0 || spa->range_index == 0) + continue; if (memdev->range_index != spa->range_index) continue; if (count >= ND_MAX_MAPPINGS) {