From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754162AbdLHPMK (ORCPT ); Fri, 8 Dec 2017 10:12:10 -0500 Received: from mx2.suse.de ([195.135.220.15]:46457 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754105AbdLHPLt (ORCPT ); Fri, 8 Dec 2017 10:11:49 -0500 From: Juergen Gross To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Cc: boris.ostrovsky@oracle.com, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, corbet@lwn.net, rjw@rjwysocki.net, lenb@kernel.org, linux-acpi@vger.kernel.org, Juergen Gross Subject: [PATCH v3 0/4] x86: make rsdp address accessible via boot params Date: Fri, 8 Dec 2017 16:11:35 +0100 Message-Id: <20171208151139.30213-1-jgross@suse.com> X-Mailer: git-send-email 2.12.3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the non-EFI boot path the ACPI RSDP table is currently found via either EBDA or by searching through low memory for the RSDP magic. This requires the RSDP to be located in the first 1MB of physical memory. Xen PVH guests, however, get the RSDP address via the start of day information block. In order to support an arbitrary RSDP address this patch series adds the physical address of the RSDP to the boot params structure filled by the boot loader. A kernel booted directly in PVH mode can save the RSDP address in the boot params, while a kernel booted in PVH mode via grub can rely on the RSDP address being specified by grub2 (which in turn got the address via the start of day information block from Xen). Juergen Gross (4): x86/boot: add acpi rsdp address to setup_header x86/acpi: take rsdp address for boot params if available x86/xen: fix boot loader version reported for pvh guests x86/xen: supply rsdp address in boot params for pvh guests Documentation/x86/boot.txt | 19 +++++++++++++++++++ arch/x86/boot/header.S | 6 +++++- arch/x86/include/uapi/asm/bootparam.h | 1 + arch/x86/kernel/acpi/boot.c | 7 +++++++ arch/x86/xen/enlighten_pvh.c | 5 ++++- drivers/acpi/osl.c | 10 +++++++++- include/linux/acpi.h | 2 ++ 7 files changed, 47 insertions(+), 3 deletions(-) -- 2.12.3