linux.git/arch/x86/include/uapi/asm/bootparam.h, branch v5.1

x86/acpi, x86/boot: Take RSDP address from boot params if available

2018-11-20T08:43:11+00:00

In case the RSDP address in struct boot_params is specified don't try
to find the table by searching, but take the address directly as set
by the boot loader.

Suggested-by: "H. Peter Anvin" 
Signed-off-by: Juergen Gross 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: boris.ostrovsky@oracle.com
Cc: bp@alien8.de
Cc: daniel.kiper@oracle.com
Cc: sstabellini@kernel.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20181120072529.5489-3-jgross@suse.com
Signed-off-by: Ingo Molnar

x86/boot: Mostly revert commit ae7e1238e68f2a ("Add ACPI RSDP address to setup_header")

2018-11-20T08:43:10+00:00

Peter Anvin pointed out that commit:

  ae7e1238e68f2a ("x86/boot: Add ACPI RSDP address to setup_header")

should be reverted as setup_header should only contain items set by the
legacy BIOS.

So revert said commit. Instead of fully reverting the dependent commit
of:

  e7b66d16fe4172 ("x86/acpi, x86/boot: Take RSDP address for boot params if available")

just remove the setup_header reference in order to replace it by
a boot_params in a followup patch.

Suggested-by: "H. Peter Anvin" 
Signed-off-by: Juergen Gross 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: boris.ostrovsky@oracle.com
Cc: bp@alien8.de
Cc: daniel.kiper@oracle.com
Cc: sstabellini@kernel.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20181120072529.5489-2-jgross@suse.com
Signed-off-by: Ingo Molnar

x86/boot: Add ACPI RSDP address to setup_header

2018-10-10T08:44:22+00:00

Xen PVH guests receive the address of the RSDP table from Xen. In order
to support booting a Xen PVH guest via Grub2 using the standard x86
boot entry we need a way for Grub2 to pass the RSDP address to the
kernel.

For this purpose expand the struct setup_header to hold the physical
address of the RSDP address. Being zero means it isn't specified and
has to be located the legacy way (searching through low memory or
EBDA).

While documenting the new setup_header layout and protocol version
2.14 add the missing documentation of protocol version 2.13.

There are Grub2 versions in several distros with a downstream patch
violating the boot protocol by writing past the end of setup_header.
This requires another update of the boot protocol to enable the kernel
to distinguish between a specified RSDP address and one filled with
garbage by such a broken Grub2.

From protocol 2.14 on Grub2 will write the version it is supporting
(but never a higher value than found to be supported by the kernel)
ored with 0x8000 to the version field of setup_header. This enables
the kernel to know up to which field Grub2 has written information
to. All fields after that are supposed to be clobbered.

Signed-off-by: Juergen Gross 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: boris.ostrovsky@oracle.com
Cc: bp@alien8.de
Cc: corbet@lwn.net
Cc: linux-doc@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20181010061456.22238-3-jgross@suse.com
Signed-off-by: Ingo Molnar

x86/uapi: Fix asm/bootparam.h userspace compilation errors

2018-04-05T08:05:21+00:00

Consistently use types provided by  to fix the following
asm/bootparam.h userspace compilation errors:

	/usr/include/asm/bootparam.h:140:2: error: unknown type name 'u16'
	  u16 version;
	/usr/include/asm/bootparam.h:141:2: error: unknown type name 'u16'
	  u16 compatible_version;
	/usr/include/asm/bootparam.h:142:2: error: unknown type name 'u16'
	  u16 pm_timer_address;
	/usr/include/asm/bootparam.h:143:2: error: unknown type name 'u16'
	  u16 num_cpus;
	/usr/include/asm/bootparam.h:144:2: error: unknown type name 'u64'
	  u64 pci_mmconfig_base;
	/usr/include/asm/bootparam.h:145:2: error: unknown type name 'u32'
	  u32 tsc_khz;
	/usr/include/asm/bootparam.h:146:2: error: unknown type name 'u32'
	  u32 apic_khz;
	/usr/include/asm/bootparam.h:147:2: error: unknown type name 'u8'
	  u8 standard_ioapic;
	/usr/include/asm/bootparam.h:148:2: error: unknown type name 'u8'
	  u8 cpu_ids[255];

Signed-off-by: Dmitry V. Levin 
Acked-by: Jan Kiszka 
Cc:  # v4.16
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Fixes: 4a362601baa6 ("x86/jailhouse: Add infrastructure for running in non-root cell")
Link: http://lkml.kernel.org/r/20180405043210.GA13254@altlinux.org
Signed-off-by: Ingo Molnar

x86/jailhouse: Add infrastructure for running in non-root cell

2018-01-14T20:11:54+00:00

The Jailhouse hypervisor is able to statically partition a multicore
system into multiple so-called cells. Linux is used as boot loader and
continues to run in the root cell after Jailhouse is enabled. Linux can
also run in non-root cells.

Jailhouse does not emulate usual x86 devices. It also provides no
complex ACPI but basic platform information that the boot loader
forwards via setup data. This adds the infrastructure to detect when
running in a non-root cell so that the platform can be configured as
required in succeeding steps.

Support is limited to x86-64 so far, primarily because no boot loader
stub exists for i386 and, thus, we wouldn't be able to test the 32-bit
path.

Signed-off-by: Jan Kiszka 
Signed-off-by: Thomas Gleixner 
Cc: jailhouse-dev@googlegroups.com
Link: https://lkml.kernel.org/r/7f823d077b38b1a70c526b40b403f85688c137d3.1511770314.git.jan.kiszka@siemens.com

License cleanup: add SPDX license identifier to uapi header files with no license

2017-11-02T10:19:54+00:00

Many user space API headers are missing licensing information, which
makes it hard for compliance tools to determine the correct license.

By default are files without license information under the default
license of the kernel, which is GPLV2.  Marking them GPLV2 would exclude
them from being included in non GPLV2 code, which is obviously not
intended. The user space API headers fall under the syscall exception
which is in the kernels COPYING file:

   NOTE! This copyright does *not* cover user programs that use kernel
   services by normal system calls - this is merely considered normal use
   of the kernel, and does *not* fall under the heading of "derived work".

otherwise syscall usage would not be possible.

Update the files which contain no license information with an SPDX
license identifier.  The chosen identifier is 'GPL-2.0 WITH
Linux-syscall-note' which is the officially assigned identifier for the
Linux syscall exception.  SPDX license identifiers are a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.  See the previous patch in this series for the
methodology of how this patch was researched.

Reviewed-by: Kate Stewart 
Reviewed-by: Philippe Ombredanne 
Reviewed-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

x86/lguest: Remove lguest support

2017-08-24T07:57:28+00:00

Lguest seems to be rather unused these days. It has seen only patches
ensuring it still builds the last two years and its official state is
"Odd Fixes".

Remove it in order to be able to clean up the paravirt code.

Signed-off-by: Juergen Gross 
Acked-by: Rusty Russell 
Acked-by: Thomas Gleixner 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: boris.ostrovsky@oracle.com
Cc: lguest@lists.ozlabs.org
Cc: rusty@rustcorp.com.au
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20170816173157.8633-3-jgross@suse.com
Signed-off-by: Ingo Molnar

Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2017-05-02T03:51:12+00:00

Pull x86 boot updates from Ingo Molnar:
 "The biggest changes in this cycle were:

   - reworking of the e820 code: separate in-kernel and boot-ABI data
     structures and apply a whole range of cleanups to the kernel side.

     No change in functionality.

   - enable KASLR by default: it's used by all major distros and it's
     out of the experimental stage as well.

   - ... misc fixes and cleanups"

* 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (63 commits)
  x86/KASLR: Fix kexec kernel boot crash when KASLR randomization fails
  x86/reboot: Turn off KVM when halting a CPU
  x86/boot: Fix BSS corruption/overwrite bug in early x86 kernel startup
  x86: Enable KASLR by default
  boot/param: Move next_arg() function to lib/cmdline.c for later reuse
  x86/boot: Fix Sparse warning by including required header file
  x86/boot/64: Rename start_cpu()
  x86/xen: Update e820 table handling to the new core x86 E820 code
  x86/boot: Fix pr_debug() API braindamage
  xen, x86/headers: Add  dependency to 
  x86/boot/e820: Simplify e820__update_table()
  x86/boot/e820: Separate the E820 ABI structures from the in-kernel structures
  x86/boot/e820: Fix and clean up e820_type switch() statements
  x86/boot/e820: Rename the remaining E820 APIs to the e820__*() prefix
  x86/boot/e820: Remove unnecessary #include's
  x86/boot/e820: Rename e820_mark_nosave_regions() to e820__register_nosave_regions()
  x86/boot/e820: Rename e820_reserve_resources*() to e820__reserve_resources*()
  x86/boot/e820: Use bool in query APIs
  x86/boot/e820: Document e820__reserve_setup_data()
  x86/boot/e820: Clean up __e820__update_table() et al
  ...

x86/boot: Correct setup_header.start_sys name

2017-03-01T10:27:26+00:00

It is called start_sys_seg elsewhere so rename it to that. It is an
obsolete field so we could just as well directly call it __u16 __pad...

No functional change.

Signed-off-by: Borislav Petkov 
Link: http://lkml.kernel.org/r/20170221183639.16554-1-bp@alien8.de
Signed-off-by: Thomas Gleixner

Merge branch 'linus' into WIP.x86/boot, to fix up conflicts and to pick up updates

2017-03-01T08:02:26+00:00

 Conflicts:
	arch/x86/xen/setup.c

Signed-off-by: Ingo Molnar