Pull libnvdimm fixes from Dan Williams:
"These fixes are all tagged for -stable and have received a build
success notification from the kbuild robot.

- NVDIMM namespaces, configured to enforce 1GB alignment, fail to
initialize on platforms that mis-align the start or end of the
physical address range.

- The Linux implementation of the BTT (Block Translation Table) is
incompatible with the UEFI 2.7 definition of the BTT format. The
BTT layers a software atomic sector semantic on top of an NVDIMM
namespace. Linux needs to be compatible with the UEFI definition to
enable boot support or any pre-OS access of data on a BTT enabled
namespace.

- A fix for ACPI SMART notification events, this allows a userspace
monitor to register for health events rather than poll. This has
been broken since it was initially merged as the unit test
inadvertently worked around the problem. The urgency for fixing
this during the -rc series is driven by how expensive it is to poll
for this data (System Management Mode entry)"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
libnvdimm, btt: Fix an incompatibility in the log layout
libnvdimm, btt: add a couple of missing kernel-doc lines
libnvdimm, dax: fix 1GB-aligned namespaces vs physical misalignment
libnvdimm, pfn: fix start_pad handling for aligned namespaces
acpi, nfit: fix health event notification

Pull x86 PTI preparatory patches from Thomas Gleixner:
"Todays Advent calendar window contains twentyfour easy to digest
patches. The original plan was to have twenty three matching the date,
but a late fixup made that moot.

- Move the cpu_entry_area mapping out of the fixmap into a separate
address space. That's necessary because the fixmap becomes too big
with NRCPUS=8192 and this caused already subtle and hard to
diagnose failures.

The top most patch is fresh from today and cures a brain slip of
that tall grumpy german greybeard, who ignored the intricacies of
32bit wraparounds.

- Limit the number of CPUs on 32bit to 64. That's insane big already,
but at least it's small enough to prevent address space issues with
the cpu_entry_area map, which have been observed and debugged with
the fixmap code

- A few TLB flush fixes in various places plus documentation which of
the TLB functions should be used for what.

- Rename the SYSENTER stack to CPU_ENTRY_AREA stack as it is used for
more than sysenter now and keeping the name makes backtraces
confusing.

- Prevent LDT inheritance on exec() by moving it to arch_dup_mmap(),
which is only invoked on fork().

- Make vysycall more robust.

- A few fixes and cleanups of the debug_pagetables code. Check
PAGE_PRESENT instead of checking the PTE for 0 and a cleanup of the
C89 initialization of the address hint array which already was out
of sync with the index enums.

- Move the ESPFIX init to a different place to prepare for PTI.

- Several code moves with no functional change to make PTI
integration simpler and header files less convoluted.

- Documentation fixes and clarifications"

* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit
init: Invoke init_espfix_bsp() from mm_init()
x86/cpu_entry_area: Move it out of the fixmap
x86/cpu_entry_area: Move it to a separate unit
x86/mm: Create asm/invpcid.h
x86/mm: Put MMU to hardware ASID translation in one place
x86/mm: Remove hard-coded ASID limit checks
x86/mm: Move the CR3 construction functions to tlbflush.h
x86/mm: Add comments to clarify which TLB-flush functions are supposed to flush what
x86/mm: Remove superfluous barriers
x86/mm: Use __flush_tlb_one() for kernel memory
x86/microcode: Dont abuse the TLB-flush interface
x86/uv: Use the right TLB-flush API
x86/entry: Rename SYSENTER_stack to CPU_ENTRY_AREA_entry_stack
x86/doc: Remove obvious weirdnesses from the x86 MM layout documentation
x86/mm/64: Improve the memory map documentation
x86/ldt: Prevent LDT inheritance on exec
x86/ldt: Rework locking
arch, mm: Allow arch_dup_mmap() to fail
x86/vsyscall/64: Warn and fail vsyscall emulation in NATIVE mode
...

Due to a spec misinterpretation, the Linux implementation of the BTT log
area had different padding scheme from other implementations, such as
UEFI and NVML.

This fixes the padding scheme, and defaults to it for new BTT layouts.
We attempt to detect the padding scheme in use when probing for an
existing BTT. If we detect the older/incompatible scheme, we continue
using it.

Reported-by: Juston Li <juston.li@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: <stable@vger.kernel.org>
Fixes: 5212e11fde4d ("nd_btt: atomic sector updates")
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Pull powerpc fixes from Michael Ellerman:
"This is all fairly boring, except that there's two KVM fixes that
you'd normally get via Paul's kvm-ppc tree. He's away so I picked them
up. I was waiting to see if he would apply them, which is why they
have only been in my tree since today. But they were on the list for a
while and have been tested on the relevant hardware.

Of note is two fixes for KVM XIVE (Power9 interrupt controller). These
would normally go via the KVM tree but Paul is away so I've picked
them up.

Other than that, two fixes for error handling in the IMC driver, and
one for a potential oops in the BHRB code if the hardware records a
branch address that has subsequently been unmapped, and finally a
s/%p/%px/ in our oops code.

Thanks to: Anju T Sudhakar, Cédric Le Goater, Laurent Vivier, Madhavan
Srinivasan, Naveen N. Rao, Ravi Bangoria"

* tag 'powerpc-4.15-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
KVM: PPC: Book3S HV: Fix pending_pri value in kvmppc_xive_get_icp()
KVM: PPC: Book3S: fix XIVE migration of pending interrupts
powerpc/kernel: Print actual address of regs when oopsing
powerpc/perf: Fix kfree memory allocated for nest pmus
powerpc/perf/imc: Fix nest-imc cpuhotplug callback failure
powerpc/perf: Dereference BHRB entries safely

The loop which populates the CPU entry area PMDs can wrap around on 32bit
machines when the number of CPUs is small.

It worked wonderful for NR_CPUS=64 for whatever reason and the moron who
wrote that code did not bother to test it with !SMP.

Check for the wraparound to fix it.

Fixes: 92a0f81d8957 ("x86/cpu_entry_area: Move it out of the fixmap")
Reported-by: kernel test robot <fengguang.wu@intel.com>
Signed-off-by: Thomas "Feels stupid" Gleixner <tglx@linutronix.de>
Tested-by: Borislav Petkov <bp@alien8.de>

Recent updates to btt.h neglected to add corresponding kernel-doc lines
for new structure members. Add them.

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Pull xen fixes from Juergen Gross:
"This contains two fixes for running under Xen:

- a fix avoiding resource conflicts between adding mmio areas and
memory hotplug

- a fix setting NX bits in page table entries copied from Xen when
running a PV guest"

* tag 'for-linus-4.15-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/balloon: Mark unallocated host memory as UNUSABLE
x86-64/Xen: eliminate W+X mappings

When we migrate a VM from a POWER8 host (XICS) to a POWER9 host
(XICS-on-XIVE), we have an error:

qemu-kvm: Unable to restore KVM interrupt controller state \
(0xff000000) for CPU 0: Invalid argument

This is because kvmppc_xics_set_icp() checks the new state
is internaly consistent, and especially:

...
1129 if (xisr == 0) {
1130 if (pending_pri != 0xff)
1131 return -EINVAL;
...

On the other side, kvmppc_xive_get_icp() doesn't set
neither the pending_pri value, nor the xisr value (set to 0)
(and kvmppc_xive_set_icp() ignores the pending_pri value)

As xisr is 0, pending_pri must be set to 0xff.

Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
Cc: stable@vger.kernel.org # v4.12+
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

init_espfix_bsp() needs to be invoked before the page table isolation
initialization. Move it into mm_init() which is the place where pti_init()
will be added.

While at it get rid of the #ifdeffery and provide proper stub functions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

The following namespace configuration attempt:

# ndctl create-namespace -e namespace0.0 -m devdax -a 1G -f
libndctl: ndctl_dax_enable: dax0.1: failed to enable
Error: namespace0.0: failed to enable

failed to reconfigure namespace: No such device or address

...fails when the backing memory range is not physically aligned to 1G:

# cat /proc/iomem | grep Persistent
210000000-30fffffff : Persistent Memory (legacy)

In the above example the 4G persistent memory range starts and ends on a
256MB boundary.

We handle this case correctly when needing to handle cases that violate
section alignment (128MB) collisions against "System RAM", and we simply
need to extend that padding/truncation for the 1GB alignment use case.

Cc: <stable@vger.kernel.org>
Fixes: 315c562536c4 ("libnvdimm, pfn: add 'align' attribute...")
Reported-and-tested-by: Jane Chu <jane.chu@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Pull xfs fixes from Darrick Wong:
"Here are some XFS fixes for 4.15-rc5. Apologies for the unusually
large number of patches this late, but I wanted to make sure the
corruption fixes were really ready to go.

Changes since last update:

- Fix a locking problem during xattr block conversion that could lead
to the log checkpointing thread to try to write an incomplete
buffer to disk, which leads to a corruption shutdown

- Fix a null pointer dereference when removing delayed allocation
extents

- Remove post-eof speculative allocations when reflinking a block
past current inode size so that we don't just leave them there and
assert on inode reclaim

- Relax an assert which didn't accurately reflect the way locking
works and would trigger under heavy io load

- Avoid infinite loop when cancelling copy on write extents after a
writeback failure

- Try to avoid copy on write transaction reservation overflows when
remapping after a successful write

- Fix various problems with the copy-on-write reservation automatic
garbage collection not being cleaned up properly during a ro
remount

- Fix problems with rmap log items being processed in the wrong
order, leading to corruption shutdowns

- Fix problems with EFI recovery wherein the "remove any rmapping if
present" mechanism wasn't actually doing anything, which would lead
to corruption problems later when the extent is reallocated,
leading to multiple rmaps for the same extent"

* tag 'xfs-4.15-fixes-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: only skip rmap owner checks for unknown-owner rmap removal
xfs: always honor OWN_UNKNOWN rmap removal requests
xfs: queue deferred rmap ops for cow staging extent alloc/free in the right order
xfs: set cowblocks tag for direct cow writes too
xfs: remove leftover CoW reservations when remounting ro
xfs: don't be so eager to clear the cowblocks tag on truncate
xfs: track cowblocks separately in i_flags
xfs: allow CoW remap transactions to use reserve blocks
xfs: avoid infinite loop when cancelling CoW blocks after writeback failure
xfs: relax is_reflink_inode assert in xfs_reflink_find_cow_mapping
xfs: remove dest file's post-eof preallocations before reflinking
xfs: move xfs_iext_insert tracepoint to report useful information
xfs: account for null transactions in bunmapi
xfs: hold xfs_buf locked between shortform->leaf conversion and the addition of an attribute
xfs: add the ability to join a held buffer to a defer_ops

Commit f5775e0b6116 ("x86/xen: discard RAM regions above the maximum
reservation") left host memory not assigned to dom0 as available for
memory hotplug.

Unfortunately this also meant that those regions could be used by
others. Specifically, commit fa564ad96366 ("x86/PCI: Enable a 64bit BAR
on AMD Family 15h (Models 00-1f, 30-3f, 60-7f)") may try to map those
addresses as MMIO.

To prevent this mark unallocated host memory as E820_TYPE_UNUSABLE (thus
effectively reverting f5775e0b6116) and keep track of that region as
a hostmem resource that can be used for the hotplug.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>

When restoring a pending interrupt, we are setting the Q bit to force
a retrigger in xive_finish_unmask(). But we also need to force an EOI
in this case to reach the same initial state : P=1, Q=0.

This can be done by not setting 'old_p' for pending interrupts which
will inform xive_finish_unmask() that an EOI needs to be sent.

Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
Cc: stable@vger.kernel.org # v4.12+
Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>