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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 99D4DC33C9E for ; Sat, 11 Jan 2020 10:15:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C98A20882 for ; Sat, 11 Jan 2020 10:15:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737714; bh=GO7tGw4PWBWDUud0LUtRlKZcxaeqxivaTtMUKSsvUI8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yWPSZORe12Wvit7KVplOW6Me2DdtKFr/B0XyVt/gYwplPfdHPQD5KOnKnB3Mek/V8 xqpi/zivc+m3DC5/2OM65a8mNJ/cGgIuZyVMSYCOmDbMdps3VwLJbj7yFhKsmIBXas 0fm10oiBNidsI/GopUfqbg5qoJHUxnYS8n166Ggs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730307AbgAKKPN (ORCPT ); Sat, 11 Jan 2020 05:15:13 -0500 Received: from mail.kernel.org ([198.145.29.99]:56218 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730048AbgAKKPK (ORCPT ); Sat, 11 Jan 2020 05:15:10 -0500 Received: from localhost (unknown [62.119.166.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5CCAA2082E; Sat, 11 Jan 2020 10:15:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737709; bh=GO7tGw4PWBWDUud0LUtRlKZcxaeqxivaTtMUKSsvUI8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kMV1dOPDgsFJ33Ns5YQW6JjKmvLMJjcBJ21qODnIbQoHdHdkR1zYu9tJX9UhySKDJ PuCnvH7xxswkeOl6zSgYMiZbK1b/dVIXywumhsFXw5Ox/hE8Hxb3cWZLCDNTmZ2viY Nz05rKmHNThVUmOne/3y7TqTx2DHZkwpLls/HcMg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Weiser , Dave Young , Ard Biesheuvel , Borislav Petkov , "Eric W. Biederman" , "H. Peter Anvin" , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , kexec@lists.infradead.org, linux-efi@vger.kernel.org, Ingo Molnar , Sasha Levin Subject: [PATCH 4.19 10/84] x86/efi: Update e820 with reserved EFI boot services data to fix kexec breakage Date: Sat, 11 Jan 2020 10:49:47 +0100 Message-Id: <20200111094848.096404230@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200111094845.328046411@linuxfoundation.org> References: <20200111094845.328046411@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Young [ Upstream commit af164898482817a1d487964b68f3c21bae7a1beb ] Michael Weiser reported that he got this error during a kexec rebooting: esrt: Unsupported ESRT version 2904149718861218184. The ESRT memory stays in EFI boot services data, and it was reserved in kernel via efi_mem_reserve(). The initial purpose of the reservation is to reuse the EFI boot services data across kexec reboot. For example the BGRT image data and some ESRT memory like Michael reported. But although the memory is reserved it is not updated in the X86 E820 table, and kexec_file_load() iterates system RAM in the IO resource list to find places for kernel, initramfs and other stuff. In Michael's case the kexec loaded initramfs overwrote the ESRT memory and then the failure happened. Since kexec_file_load() depends on the E820 table being updated, just fix this by updating the reserved EFI boot services memory as reserved type in E820. Originally any memory descriptors with EFI_MEMORY_RUNTIME attribute are bypassed in the reservation code path because they are assumed as reserved. But the reservation is still needed for multiple kexec reboots, and it is the only possible case we come here thus just drop the code chunk, then everything works without side effects. On my machine the ESRT memory sits in an EFI runtime data range, it does not trigger the problem, but I successfully tested with BGRT instead. both kexec_load() and kexec_file_load() work and kdump works as well. [ mingo: Edited the changelog. ] Reported-by: Michael Weiser Tested-by: Michael Weiser Signed-off-by: Dave Young Cc: Ard Biesheuvel Cc: Borislav Petkov Cc: Eric W. Biederman Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: kexec@lists.infradead.org Cc: linux-efi@vger.kernel.org Link: https://lkml.kernel.org/r/20191204075233.GA10520@dhcp-128-65.nay.redhat.com Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- arch/x86/platform/efi/quirks.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c index 844d31cb8a0c..c9873c9168ad 100644 --- a/arch/x86/platform/efi/quirks.c +++ b/arch/x86/platform/efi/quirks.c @@ -259,10 +259,6 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size) return; } - /* No need to reserve regions that will never be freed. */ - if (md.attribute & EFI_MEMORY_RUNTIME) - return; - size += addr % EFI_PAGE_SIZE; size = round_up(size, EFI_PAGE_SIZE); addr = round_down(addr, EFI_PAGE_SIZE); @@ -292,6 +288,8 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size) early_memunmap(new, new_size); efi_memmap_install(new_phys, num_entries); + e820__range_update(addr, size, E820_TYPE_RAM, E820_TYPE_RESERVED); + e820__update_table(e820_table); } /* -- 2.20.1