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authorDaniel Kiper <daniel.kiper@oracle.com>2019-11-12 14:46:39 +0100
committerBorislav Petkov <bp@suse.de>2019-11-12 16:16:54 +0100
commit00cd1c154d565c62ad5e065bf3530f68bdf59490 (patch)
tree110d37ffd112b0c703103716dad76bdbe5c48dac
parent2c33c27fd6033ced942c9a591b8ac15c07c57d70 (diff)
downloadlinux-00cd1c154d565c62ad5e065bf3530f68bdf59490.tar.bz2
x86/boot: Introduce kernel_info.setup_type_max
This field contains maximal allowed type for setup_data. Do not bump setup_header version in arch/x86/boot/header.S because it will be followed by additional changes coming into the Linux/x86 boot protocol. Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Ross Philipson <ross.philipson@oracle.com> Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: ard.biesheuvel@linaro.org Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: dave.hansen@linux.intel.com Cc: eric.snowberg@oracle.com Cc: Ingo Molnar <mingo@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Juergen Gross <jgross@suse.com> Cc: kanth.ghatraju@oracle.com Cc: linux-doc@vger.kernel.org Cc: linux-efi <linux-efi@vger.kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: rdunlap@infradead.org Cc: ross.philipson@oracle.com Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Cc: xen-devel@lists.xenproject.org Link: https://lkml.kernel.org/r/20191112134640.16035-3-daniel.kiper@oracle.com
-rw-r--r--Documentation/x86/boot.rst9
-rw-r--r--arch/x86/boot/compressed/kernel_info.S5
-rw-r--r--arch/x86/include/uapi/asm/bootparam.h3
3 files changed, 16 insertions, 1 deletions
diff --git a/Documentation/x86/boot.rst b/Documentation/x86/boot.rst
index c60fafda9427..6cdd767c3835 100644
--- a/Documentation/x86/boot.rst
+++ b/Documentation/x86/boot.rst
@@ -73,7 +73,7 @@ Protocol 2.14: BURNT BY INCORRECT COMMIT ae7e1238e68f2a472a125673ab506d49158c188
(x86/boot: Add ACPI RSDP address to setup_header)
DO NOT USE!!! ASSUME SAME AS 2.13.
-Protocol 2.15: (Kernel 5.5) Added the kernel_info.
+Protocol 2.15: (Kernel 5.5) Added the kernel_info and kernel_info.setup_type_max.
============= ============================================================
.. note::
@@ -981,6 +981,13 @@ Offset/size: 0x0008/4
This field contains the size of the kernel_info including kernel_info.header
and kernel_info.kernel_info_var_len_data.
+============ ==============
+Field name: setup_type_max
+Offset/size: 0x000c/4
+============ ==============
+
+ This field contains maximal allowed type for setup_data.
+
The Image Checksum
==================
diff --git a/arch/x86/boot/compressed/kernel_info.S b/arch/x86/boot/compressed/kernel_info.S
index 8ea6f6e3feef..018dacbd753e 100644
--- a/arch/x86/boot/compressed/kernel_info.S
+++ b/arch/x86/boot/compressed/kernel_info.S
@@ -1,5 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
+#include <asm/bootparam.h>
+
.section ".rodata.kernel_info", "a"
.global kernel_info
@@ -12,6 +14,9 @@ kernel_info:
/* Size total. */
.long kernel_info_end - kernel_info
+ /* Maximal allowed type for setup_data. */
+ .long SETUP_TYPE_MAX
+
kernel_info_var_len_data:
/* Empty for time being... */
kernel_info_end:
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index a1ebcd7a991c..dbb41128e5a0 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -11,6 +11,9 @@
#define SETUP_APPLE_PROPERTIES 5
#define SETUP_JAILHOUSE 6
+/* max(SETUP_*) */
+#define SETUP_TYPE_MAX SETUP_JAILHOUSE
+
/* ram_size flags */
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000