linux-toradex.git/include/linux/kexec.h, branch v4.11-rc3

Merge tag 'powerpc-4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2016-12-16T17:26:42+00:00

Pull powerpc updates from Michael Ellerman:
 "Highlights include:

   - Support for the kexec_file_load() syscall, which is a prereq for
     secure and trusted boot.

   - Prevent kernel execution of userspace on P9 Radix (similar to
     SMEP/PXN).

   - Sort the exception tables at build time, to save time at boot, and
     store them as relative offsets to save space in the kernel image &
     memory.

   - Allow building the kernel with thin archives, which should allow us
     to build an allyesconfig once some other fixes land.

   - Build fixes to allow us to correctly rebuild when changing the
     kernel endian from big to little or vice versa.

   - Plumbing so that we can avoid doing a full mm TLB flush on P9
     Radix.

   - Initial stack protector support (-fstack-protector).

   - Support for dumping the radix (aka. Linux) and hash page tables via
     debugfs.

   - Fix an oops in cxl coredump generation when cxl_get_fd() is used.

   - Freescale updates from Scott: "Highlights include 8xx hugepage
     support, qbman fixes/cleanup, device tree updates, and some misc
     cleanup."

   - Many and varied fixes and minor enhancements as always.

  Thanks to:
    Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Anshuman
    Khandual, Anton Blanchard, Balbir Singh, Bartlomiej Zolnierkiewicz,
    Christophe Jaillet, Christophe Leroy, Denis Kirjanov, Elimar
    Riesebieter, Frederic Barrat, Gautham R. Shenoy, Geliang Tang, Geoff
    Levand, Jack Miller, Johan Hovold, Lars-Peter Clausen, Libin,
    Madhavan Srinivasan, Michael Neuling, Nathan Fontenot, Naveen N.
    Rao, Nicholas Piggin, Pan Xinhui, Peter Senna Tschudin, Rashmica
    Gupta, Rui Teng, Russell Currey, Scott Wood, Simon Guo, Suraj
    Jitindar Singh, Thiago Jung Bauermann, Tobias Klauser, Vaibhav Jain"

[ And thanks to Michael, who took time off from a new baby to get this
  pull request done.   - Linus ]

* tag 'powerpc-4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (174 commits)
  powerpc/fsl/dts: add FMan node for t1042d4rdb
  powerpc/fsl/dts: add sg_2500_aqr105_phy4 alias on t1024rdb
  powerpc/fsl/dts: add QMan and BMan nodes on t1024
  powerpc/fsl/dts: add QMan and BMan nodes on t1023
  soc/fsl/qman: test: use DEFINE_SPINLOCK()
  powerpc/fsl-lbc: use DEFINE_SPINLOCK()
  powerpc/8xx: Implement support of hugepages
  powerpc: get hugetlbpage handling more generic
  powerpc: port 64 bits pgtable_cache to 32 bits
  powerpc/boot: Request no dynamic linker for boot wrapper
  soc/fsl/bman: Use resource_size instead of computation
  soc/fsl/qe: use builtin_platform_driver
  powerpc/fsl_pmc: use builtin_platform_driver
  powerpc/83xx/suspend: use builtin_platform_driver
  powerpc/ftrace: Fix the comments for ftrace_modify_code
  powerpc/perf: macros for power9 format encoding
  powerpc/perf: power9 raw event format encoding
  powerpc/perf: update attribute_group data structure
  powerpc/perf: factor out the event format field
  powerpc/mm/iommu, vfio/spapr: Put pages on VFIO container shutdown
  ...

Revert "kdump, vmcoreinfo: report memory sections virtual addresses"

2016-12-15T00:04:07+00:00

This reverts commit 0549a3c02efb ("kdump, vmcoreinfo: report memory
sections virtual addresses").

Commit 0549a3c02efb tells the userspace utility makedumpfile the
randomized base address of these memmory sections when mm kaslr is
enabled.  However the following patch "kexec: export the value of
phys_base instead of symbol address" makes makedumpfile not need these
addresses any more.

Besides we should use VMCOREINFO_NUMBER to export the value of the
variable so that we can use the existing number_table mechanism of
Makedumpfile to fetch it.  So revert it now.  If needed we can add it
later.

http://lists.infradead.org/pipermail/kexec/2016-October/017540.html
Link: http://lkml.kernel.org/r/1478568596-30060-1-git-send-email-bhe@redhat.com
Signed-off-by: Baoquan He 
Cc: Thomas Garnier 
Cc: Baoquan He 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H . Peter Anvin" 
Cc: Eric Biederman 
Cc: Xunlei Pang 
Cc: HATAYAMA Daisuke 
Cc: Kees Cook 
Cc: Eugene Surovegin 
Cc: Dave Young 
Cc: AKASHI Takahiro 
Cc: Atsushi Kumagai 
Cc: Dave Anderson 
Cc: Pratyush Anand 
Cc: Vivek Goyal 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kexec_file: Factor out kexec_locate_mem_hole from kexec_add_buffer.

2016-11-30T12:15:01+00:00

kexec_locate_mem_hole will be used by the PowerPC kexec_file_load
implementation to find free memory for the purgatory stack.

Signed-off-by: Thiago Jung Bauermann 
Acked-by: Dave Young 
Signed-off-by: Michael Ellerman

kexec_file: Change kexec_add_buffer to take kexec_buf as argument.

2016-11-30T12:14:59+00:00

This is done to simplify the kexec_add_buffer argument list.
Adapt all callers to set up a kexec_buf to pass to kexec_add_buffer.

In addition, change the type of kexec_buf.buffer from char * to void *.
There is no particular reason for it to be a char *, and the change
allows us to get rid of 3 existing casts to char * in the code.

Signed-off-by: Thiago Jung Bauermann 
Acked-by: Dave Young 
Acked-by: Balbir Singh 
Signed-off-by: Michael Ellerman

kexec_file: Allow arch-specific memory walking for kexec_add_buffer

2016-11-30T12:14:57+00:00

Allow architectures to specify a different memory walking function for
kexec_add_buffer. x86 uses iomem to track reserved memory ranges, but
PowerPC uses the memblock subsystem.

Signed-off-by: Thiago Jung Bauermann 
Acked-by: Dave Young 
Acked-by: Balbir Singh 
Signed-off-by: Michael Ellerman

kdump, vmcoreinfo: report memory sections virtual addresses

2016-10-11T22:06:33+00:00

KASLR memory randomization can randomize the base of the physical memory
mapping (PAGE_OFFSET), vmalloc (VMALLOC_START) and vmemmap
(VMEMMAP_START).  Adding these variables on VMCOREINFO so tools can easily
identify the base of each memory section.

Link: http://lkml.kernel.org/r/1471531632-23003-1-git-send-email-thgarnie@google.com
Signed-off-by: Thomas Garnier 
Acked-by: Baoquan He 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "H . Peter Anvin" 
Cc: Eric Biederman 
Cc: Xunlei Pang 
Cc: HATAYAMA Daisuke 
Cc: Kees Cook 
Cc: Eugene Surovegin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kexec: add a kexec_crash_loaded() function

2016-08-02T23:35:30+00:00

Provide a wrapper function to be used by kernel code to check whether a
crash kernel is loaded.  It returns the same value that can be seen in
/sys/kernel/kexec_crash_loaded by userspace programs.

I'm exporting the function, because it will be used by Xen, and it is
possible to compile Xen modules separately to enable the use of PV
drivers with unmodified bare-metal kernels.

Link: http://lkml.kernel.org/r/20160713121955.14969.69080.stgit@hananiah.suse.cz
Signed-off-by: Petr Tesarik 
Cc: Juergen Gross 
Cc: Josh Triplett 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Eric Biederman 
Cc: "H. Peter Anvin" 
Cc: Boris Ostrovsky 
Cc: "Paul E. McKenney" 
Cc: Dave Young 
Cc: David Vrabel 
Cc: Vivek Goyal 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kexec: allow architectures to override boot mapping

2016-08-02T23:35:27+00:00

kexec physical addresses are the boot-time view of the system.  For
certain ARM systems (such as Keystone 2), the boot view of the system
does not match the kernel's view of the system: the boot view uses a
special alias in the lower 4GB of the physical address space.

To cater for these kinds of setups, we need to translate between the
boot view physical addresses and the normal kernel view physical
addresses.  This patch extracts the current transation points into
linux/kexec.h, and allows an architecture to override the functions.

Due to the translations required, we unfortunately end up with six
translation functions, which are reduced down to four that the
architecture can override.

[akpm@linux-foundation.org: kexec.h needs asm/io.h for phys_to_virt()]
Link: http://lkml.kernel.org/r/E1b8koP-0004HZ-Vf@rmk-PC.armlinux.org.uk
Signed-off-by: Russell King 
Cc: Keerthy 
Cc: Pratyush Anand 
Cc: Vitaly Andrianov 
Cc: Eric Biederman 
Cc: Dave Young 
Cc: Baoquan He 
Cc: Vivek Goyal 
Cc: Simon Horman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kdump: arrange for paddr_vmcoreinfo_note() to return phys_addr_t

2016-08-02T23:35:27+00:00

On PAE systems (eg, ARM LPAE) the vmcore note may be located above 4GB
physical on 32-bit architectures, so we need a wider type than "unsigned
long" here.  Arrange for paddr_vmcoreinfo_note() to return a
phys_addr_t, thereby allowing it to be located above 4GB.

This makes no difference for kexec-tools, as they already assume a
64-bit type when reading from this file.

Link: http://lkml.kernel.org/r/E1b8koK-0004HS-K9@rmk-PC.armlinux.org.uk
Signed-off-by: Russell King 
Reviewed-by: Pratyush Anand 
Acked-by: Baoquan He 
Cc: Keerthy 
Cc: Vitaly Andrianov 
Cc: Eric Biederman 
Cc: Dave Young 
Cc: Vivek Goyal 
Cc: Simon Horman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kexec: don't invoke OOM-killer for control page allocation

2016-08-02T23:35:26+00:00

If we are unable to find a suitable page when allocating the control
page, do not invoke the OOM-killer: killing processes probably isn't
going to help.

Link: http://lkml.kernel.org/r/E1b8ko9-0004HG-R5@rmk-PC.armlinux.org.uk
Signed-off-by: Russell King 
Reviewed-by: Pratyush Anand 
Acked-by: Baoquan He 
Cc: Keerthy 
Cc: Vitaly Andrianov 
Cc: Eric Biederman 
Cc: Dave Young 
Cc: Vivek Goyal 
Cc: Simon Horman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds