Implement a simple policy whereby if the HW supports FEAT_LPA2 for the
page size we are using, always use LPA2-style page-tables for stage 2
and hyp stage 1 (assuming an nvhe hyp), regardless of the VMM-requested
IPA size or HW-implemented PA size. When in use we can now support up to
52-bit IPA and PA sizes.

We use the previously created cpu feature to track whether LPA2 is
supported for deciding whether to use the LPA2 or classic pte format.

Note that FEAT_LPA2 brings support for bigger block mappings (512GB with
4KB, 64GB with 16KB). We explicitly don't enable these in the library
because stage2_apply_range() works on batch sizes of the largest used
block mapping, and increasing the size of the batch would lead to soft
lockups. See commit 5994bc9e ("KVM: arm64: Limit
stage2_apply_range() batch size to largest block").

With the addition of LPA2 support in the hypervisor, the PA size
supported by the HW must be capped with a runtime decision, rather than
simply using a compile-time decision based on PA_BITS. For example, on a
system that advertises 52 bit PA but does not support FEAT_LPA2, A 4KB
or 16KB kernel compiled with LPA2 support must still limit the PA size
to 48 bits.

Therefore, move the insertion of the PS field into TCR_EL2 out of
__kvm_hyp_init assembly code and instead do it in cpu_prepare_hyp_mode()
where the rest of TCR_EL2 is prepared. This allows us to figure out PS
with kvm_get_parange(), which has the appropriate logic to ensure the
above requirement. (and the PS field of VTCR_EL2 is already populated
this way).
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-8-ryan.roberts@arm.com

As per Arm ARM (0487I.a), (V)TCR_EL2.DS fields control whether 52 bit
input and output addresses are supported on 4K and 16K page size
configurations when FEAT_LPA2 is known to have been implemented.

This adds these field definitions which will be used by KVM when
FEAT_LPA2 is enabled.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-7-ryan.roberts@arm.com

Expose FEAT_LPA2 as a capability so that we can take advantage of
alternatives patching in the hypervisor.

Although FEAT_LPA2 presence is advertised separately for stage1 and
stage2, the expectation is that in practice both stages will either
support or not support it. Therefore, we combine both into a single
capability, allowing us to simplify the implementation. KVM requires
support in both stages in order to use LPA2 since the same library is
used for hyp stage 1 and guest stage 2 pgtables.
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-6-ryan.roberts@arm.com

PAGE_SIZE support is tested against possible minimum and maximum values for
its respective ID_AA64MMFR0.TGRAN field, depending on whether it is signed
or unsigned. But then FEAT_LPA2 implementation needs to be validated for 4K
and 16K page sizes via feature specific ID_AA64MMFR0.TGRAN values. Hence it
adds FEAT_LPA2 specific ID_AA64MMFR0.TGRAN[2] values per ARM ARM (0487G.A).
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-5-ryan.roberts@arm.com

FEAT_LPA2 impacts tlb invalidation in 2 ways; Firstly, the TTL field in
the non-range tlbi instructions can now validly take a 0 value as a
level hint for the 4KB granule (this is due to the extra level of
translation) - previously TTL=0b0100 meant no hint and was treated as
0b0000. Secondly, The BADDR field of the range-based tlbi instructions
is specified in 64KB units when LPA2 is in use (TCR.DS=1), whereas it is
in page units otherwise. Changes are required for tlbi to continue to
operate correctly when LPA2 is in use.

Solve the first problem by always adding the level hint if the level is
between [0, 3] (previously anything other than 0 was hinted, which
breaks in the new level -1 case from kvm). When running on non-LPA2 HW,
0 is still safe to hint as the HW will fall back to non-hinted. While we
are at it, we replace the notion of 0 being the non-hinted sentinel with
a macro, TLBI_TTL_UNKNOWN. This means callers won't need updating
if/when translation depth increases in future.

The second issue is more complex: When LPA2 is in use, use the non-range
tlbi instructions to forward align to a 64KB boundary first, then use
range-based tlbi from there on, until we have either invalidated all
pages or we have a single page remaining. If the latter, that is done
with non-range tlbi. We determine whether LPA2 is in use based on
lpa2_is_enabled() (for kernel calls) or kvm_lpa2_is_enabled() (for kvm
calls).
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-4-ryan.roberts@arm.com

Add stub functions which is initially always return false. These provide
the hooks that we need to update the range-based TLBI routines, whose
operands are encoded differently depending on whether lpa2 is enabled or
not.

The kernel and kvm will enable the use of lpa2 asynchronously in future,
and part of that enablement will involve fleshing out their respective
hook to advertise when it is using lpa2.

Since the kernel's decision to use lpa2 relies on more than just whether
the HW supports the feature, it can't just use the same static key as
kvm. This is another reason to use separate functions. lpa2_is_enabled()
is already implemented as part of Ard's kernel lpa2 series. Since kvm
will make its decision solely based on HW support, kvm_lpa2_is_enabled()
will be defined as system_supports_lpa2() once kvm starts using lpa2.
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-3-ryan.roberts@arm.com

In preparation for adding support for LPA2 to the tlb invalidation
routines, modify the algorithm used by range-based tlbi to start at the
highest 'scale' and decrement instead of starting at the lowest 'scale'
and incrementing. This new approach makes it possible to maintain 64K
alignment as we work through the range, until the last op (at scale=0).
This is required when LPA2 is enabled. (This part will be added in a
subsequent commit).

This change is separated into its own patch because it will also impact
non-LPA2 systems, and I want to make it easy to bisect in case it leads
to performance regression (see below for benchmarks that suggest this
should not be a problem).

The original commit (d1d3aa98 "arm64: tlb: Use the TLBI RANGE feature in
arm64") stated this as the reason for _incrementing_ scale:

  However, in most scenarios, the pages = 1 when flush_tlb_range() is
  called. Start from scale = 3 or other proper value (such as scale
  =ilog2(pages)), will incur extra overhead. So increase 'scale' from 0
  to maximum.

But pages=1 is already special cased by the non-range invalidation path,
which will take care of it the first time through the loop (both in the
original commit and in my change), so I don't think switching to
decrement scale should have any extra performance impact after all.

Indeed benchmarking kernel compilation, a TLBI-heavy workload, suggests
that this new approach actually _improves_ performance slightly (using a
virtual machine on Apple M2):

Table shows time to execute kernel compilation workload with 8 jobs,
relative to baseline without this patch (more negative number is
bigger speedup). Repeated 9 times across 3 system reboots:

| counter   |       mean |     stdev |
|:----------|-----------:|----------:|
| real-time |      -0.6% |      0.0% |
| kern-time |      -1.6% |      0.5% |
| user-time |      -0.4% |      0.1% |
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-2-ryan.roberts@arm.com

Pull tracing fixes from Steven Rostedt::
 "Eventfs fixes:

   - With the usage of simple_recursive_remove() recommended by Al Viro,
     the code should not be calling "d_invalidate()" itself. Doing so is
     causing crashes. The code was calling d_invalidate() on the race of
     trying to look up a file while the parent was being deleted. This
     was detected, and the added dentry was having d_invalidate() called
     on it, but the deletion of the directory was also calling
     d_invalidate() on that same dentry.

   - A fix to not free the eventfs_inode (ei) until the last dput() was
     called on its ei->dentry made the ei->dentry exist even after it
     was marked for free by setting the ei->is_freed. But code elsewhere
     still was checking if ei->dentry was NULL if ei->is_freed is set
     and would trigger WARN_ON if that was the case. That's no longer
     true and there should not be any warnings when it is true.

   - Use GFP_NOFS for allocations done under eventfs_mutex. The
     eventfs_mutex can be taken on file system reclaim, make sure that
     allocations done under that mutex do not trigger file system
     reclaim.

   - Clean up code by moving the taking of inode_lock out of the helper
     functions and into where they are needed, and not use the parameter
     to know to take it or not. It must always be held but some callers
     of the helper function have it taken when they were called.

   - Warn if the inode_lock is not held in the helper functions.

   - Warn if eventfs_start_creating() is called without a parent. As
     eventfs is underneath tracefs, all files created will have a parent
     (the top one will have a tracefs parent).

  Tracing update:

   - Add Mathieu Desnoyers as an official reviewer of the tracing subsystem"

* tag 'trace-v6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  MAINTAINERS: TRACING: Add Mathieu Desnoyers as Reviewer
  eventfs: Make sure that parent->d_inode is locked in creating files/dirs
  eventfs: Do not allow NULL parent to eventfs_start_creating()
  eventfs: Move taking of inode_lock into dcache_dir_open_wrapper()
  eventfs: Use GFP_NOFS for allocation when eventfs_mutex is held
  eventfs: Do not invalidate dentry in create_file/dir_dentry()
  eventfs: Remove expectation that ei->is_freed means ei->dentry == NULL

Pull parisc architecture fixes from Helge Deller:
 "This patchset fixes and enforces correct section alignments for the
  ex_table, altinstructions, parisc_unwind, jump_table and bug_table
  which are created by inline assembly.

  Due to not being correctly aligned at link & load time they can
  trigger unnecessarily the kernel unaligned exception handler at
  runtime. While at it, I switched the bug table to use relative
  addresses which reduces the size of the table by half on 64-bit.

  We still had the ENOSYM and EREMOTERELEASE errno symbols as left-overs
  from HP-UX, which now trigger build-issues with glibc. We can simply
  remove them.

  Most of the patches are tagged for stable kernel series.

  Summary:

   - Drop HP-UX ENOSYM and EREMOTERELEASE return codes to avoid glibc
     build issues

   - Fix section alignments for ex_table, altinstructions, parisc unwind
     table, jump_table and bug_table

   - Reduce size of bug_table on 64-bit kernel by using relative
     pointers"

* tag 'parisc-for-6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: Reduce size of the bug_table on 64-bit kernel by half
  parisc: Drop the HP-UX ENOSYM and EREMOTERELEASE error codes
  parisc: Use natural CPU alignment for bug_table
  parisc: Ensure 32-bit alignment on parisc unwind section
  parisc: Mark lock_aligned variables 16-byte aligned on SMP
  parisc: Mark jump_table naturally aligned
  parisc: Mark altinstructions read-only and 32-bit aligned
  parisc: Mark ex_table entries 32-bit aligned in uaccess.h
  parisc: Mark ex_table entries 32-bit aligned in assembly.h

Pull x86 microcode fixes from Ingo Molnar:
 "Fix/enhance x86 microcode version reporting: fix the bootup log spam,
  and remove the driver version announcement to avoid version confusion
  when distros backport fixes"

* tag 'x86-urgent-2023-11-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/microcode: Rework early revisions reporting
  x86/microcode: Remove the driver announcement and version

Pull x86 perf event fix from Ingo Molnar:
 "Fix a bug in the Intel hybrid CPUs hardware-capabilities enumeration
  code resulting in non-working events on those platforms"

* tag 'perf-urgent-2023-11-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel: Correct incorrect 'or' operation for PMU capabilities

Pull locking fix from Ingo Molnar:
 "Fix lockdep block chain corruption resulting in KASAN warnings"

* tag 'locking-urgent-2023-11-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  lockdep: Fix block chain corruption

Pull smb client fixes from Steve French:

 - use after free fix in releasing multichannel interfaces

 - fixes for special file types (report char, block, FIFOs properly when
   created e.g. by NFS to Windows)

 - fixes for reporting various special file types and symlinks properly
   when using SMB1

* tag '6.7-rc2-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb: client: introduce cifs_sfu_make_node()
  smb: client: set correct file type from NFS reparse points
  smb: client: introduce ->parse_reparse_point()
  smb: client: implement ->query_reparse_point() for SMB1
  cifs: fix use after free for iface while disabling secondary channels

Pull USB / PHY / Thunderbolt fixes from Greg KH:
 "Here are a number of reverts, fixes, and new device ids for 6.7-rc3
  for the USB, PHY, and Thunderbolt driver subsystems. Include in here
  are:

   - reverts of some PHY drivers that went into 6.7-rc1 that shouldn't
     have been merged yet, the author is reworking them based on review
     comments as they were using older apis that shouldn't be used
     anymore for newer drivers

   - small thunderbolt driver fixes for reported issues

   - USB driver fixes for a variety of small issues in dwc3, typec,
     xhci, and other smaller drivers.

   - new device ids for usb-serial and onboard_usb_hub drivers.

  All of these have been in linux-next with no reported issues"

* tag 'usb-6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (33 commits)
  USB: serial: option: add Luat Air72*U series products
  USB: dwc3: qcom: fix ACPI platform device leak
  USB: dwc3: qcom: fix software node leak on probe errors
  USB: dwc3: qcom: fix resource leaks on probe deferral
  USB: dwc3: qcom: simplify wakeup interrupt setup
  USB: dwc3: qcom: fix wakeup after probe deferral
  dt-bindings: usb: qcom,dwc3: fix example wakeup interrupt types
  usb: misc: onboard-hub: add support for Microchip USB5744
  dt-bindings: usb: microchip,usb5744: Add second supply
  usb: misc: ljca: Fix enumeration error on Dell Latitude 9420
  USB: serial: option: add Fibocom L7xx modules
  USB: xhci-plat: fix legacy PHY double init
  usb: typec: tipd: Supply also I2C driver data
  usb: xhci-mtk: fix in-ep's start-split check failure
  usb: dwc3: set the dma max_seg_size
  usb: config: fix iteration issue in 'usb_get_bos_descriptor()'
  usb: dwc3: add missing of_node_put and platform_device_put
  USB: dwc2: write HCINT with INTMASK applied
  usb: misc: ljca: Drop _ADR support to get ljca children devices
  usb: cdnsp: Fix deadlock issue during using NCM gadget
  ...

Pull xfs fix from Chandan Babu:

 - Validate quota records recovered from the log before writing them to
   the disk.

* tag 'xfs-6.7-fixes-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: dquot recovery does not validate the recovered dquot
  xfs: clean up dqblk extraction

Pull arm64 fixes from Catalin Marinas:

 - Fix "rodata=on" not disabling "rodata=full" on arm64

 - Add arm64 make dependency between vmlinuz.efi and Image, leading to
   occasional build failures previously (with parallel building)

 - Add newline to the output formatting of the za-fork kselftest

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: add dependency between vmlinuz.efi and Image
  kselftest/arm64: Fix output formatting for za-fork
  arm64: mm: Fix "rodata=on" when CONFIG_RODATA_FULL_DEFAULT_ENABLED=y

Pull xen fixes from Juergen Gross:

 - A small cleanup patch for the Xen privcmd driver

 - A fix for the swiotlb-xen driver which was missing the advertising of
   the maximum mapping length

 - A fix for Xen on Arm for a longstanding bug, which happened to occur
   only recently: a structure in percpu memory crossed a page boundary,
   which was rejected by the hypervisor

* tag 'for-linus-6.7a-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  arm/xen: fix xen_vcpu_info allocation alignment
  xen: privcmd: Replace zero-length array with flex-array member and use __counted_by
  swiotlb-xen: provide the "max_mapping_size" method

Enable GENERIC_BUG_RELATIVE_POINTERS which will store 32-bit relative
offsets to the bug address and the source file name instead of 64-bit
absolute addresses. This effectively reduces the size of the
bug_table[] array by half on 64-bit kernels.
Signed-off-by: Helge Deller <deller@gmx.de>

Those return codes are only defined for the parisc architecture and
are leftovers from when we wanted to be HP-UX compatible.

They are not returned by any Linux kernel syscall but do trigger
problems with the glibc strerrorname_np() and strerror() functions as
reported in glibc issue #31080.

There is no need to keep them, so simply remove them.
Signed-off-by: Helge Deller <deller@gmx.de>
Reported-by: Bruno Haible <bruno@clisp.org>
Closes: https://sourceware.org/bugzilla/show_bug.cgi?id=31080
Cc: stable@vger.kernel.org

Make sure that the __bug_table section gets 32- or 64-bit aligned,
depending if a 32- or 64-bit kernel is being built.
Mark it non-writeable and use .blockz instead of the .org assembler
directive to pad the struct.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+

Make sure the .PARISC.unwind section will be 32-bit aligned.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+

On parisc we need 16-byte alignment for variables which are used for
locking. Mark the __lock_aligned attribute acordingly so that the
.data..lock_aligned section will get that alignment in the generated
object files.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+

The jump_table stores two 32-bit words and one 32- (on 32-bit kernel)
or one 64-bit word (on 64-bit kernel).
Ensure that the last word is always 64-bit aligned on a 64-bit kernel
by aligning the whole structure on sizeof(long).
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+

Add an align statement to tell the linker that all ex_table entries and as
such the whole ex_table section should be 32-bit aligned in vmlinux and modules.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+

Add an align statement to tell the linker that all ex_table entries and as
such the whole ex_table section should be 32-bit aligned in vmlinux and modules.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org   # v6.0+

Pull s390 updates from Alexander Gordeev:

 - Remove unnecessary assignment of the performance event last_tag.

 - Create missing /sys/firmware/ipl/* attributes when kernel is booted
   in dump mode using List-directed ECKD IPL.

 - Remove odd comment.

 - Fix s390-specific part of scripts/checkstack.pl script that only
   matches three-digit numbers starting with 3 or any higher number and
   skips any stack sizes smaller than 304 bytes.

* tag 's390-6.7-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  scripts/checkstack.pl: match all stack sizes for s390
  s390: remove odd comment
  s390/ipl: add missing IPL_TYPE_ECKD_DUMP case to ipl_init()
  s390/pai: cleanup event initialization

Pull ACPI fixes from Rafael Wysocki:
 "These add an ACPI IRQ override quirk for ASUS ExpertBook B1402CVA and
  fix an ACPI processor idle issue leading to triple-faults in Xen HVM
  guests and an ACPI backlight driver issue that causes GPUs to
  misbehave while their children power is being fixed up.

  Specifics:

   - Avoid powering up GPUs while attempting to fix up power for their
     children (Hans de Goede)

   - Use raw_safe_halt() instead of safe_halt() in acpi_idle_play_dead()
     so as to avoid triple-falts during CPU online in Xen HVM guests due
     to the setting of the hardirqs_enabled flag in safe_halt() (David
     Woodhouse)

   - Add an ACPI IRQ override quirk for ASUS ExpertBook B1402CVA (Hans
     de Goede)"

* tag 'acpi-6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: resource: Skip IRQ override on ASUS ExpertBook B1402CVA
  ACPI: video: Use acpi_device_fix_up_power_children()
  ACPI: PM: Add acpi_device_fix_up_power_children() function
  ACPI: processor_idle: use raw_safe_halt() in acpi_idle_play_dead()

Pull power management fix from Rafael Wysocki:
 "Fix a syntax error in the sleepgraph utility which causes it to exit
  early on every invocation (David Woodhouse)"

* tag 'pm-6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: tools: Fix sleepgraph syntax error

Pull AFS fixes from David Howells:

 - Fix the afs_server_list struct to be cleaned up with RCU

 - Fix afs to translate a no-data result from a DNS lookup into ENOENT,
   not EDESTADDRREQ for consistency with OpenAFS

 - Fix afs to translate a negative DNS lookup result into ENOENT rather
   than EDESTADDRREQ

 - Fix file locking on R/O volumes to operate in local mode as the
   server doesn't handle exclusive locks on such files

 - Set SB_RDONLY on superblocks for RO and Backup volumes so that the
   VFS can see that they're read only

* tag 'afs-fixes-20231124' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Mark a superblock for an R/O or Backup volume as SB_RDONLY
  afs: Fix file locking on R/O volumes to operate in local mode
  afs: Return ENOENT if no cell DNS record can be found
  afs: Make error on cell lookup failure consistent with OpenAFS
  afs: Fix afs_server_list to be cleaned up with RCU

Merge ACPI backlight driver fixes and an ACPI processor driver fix for
6.7-rc3:

 - Avoid powering up GPUs while attempting to fix up power for their
   children (Hans de Goede).

 - Use raw_safe_halt() instead of safe_halt() in acpi_idle_play_dead()
   so as to avoid triple-falts during CPU online in Xen HVM guests due
   to the setting of the hardirqs_enabled flag in safe_halt() (David
   Woodhouse).

* acpi-video:
  ACPI: video: Use acpi_device_fix_up_power_children()
  ACPI: PM: Add acpi_device_fix_up_power_children() function

* acpi-processor:
  ACPI: processor_idle: use raw_safe_halt() in acpi_idle_play_dead()

Pull vfs fixes from Christian Brauner:

 - Avoid calling back into LSMs from vfs_getattr_nosec() calls.

   IMA used to query inode properties accessing raw inode fields without
   dedicated helpers. That was finally fixed a few releases ago by
   forcing IMA to use vfs_getattr_nosec() helpers.

   The goal of the vfs_getattr_nosec() helper is to query for attributes
   without calling into the LSM layer which would be quite problematic
   because incredibly IMA is called from __fput()...

     __fput()
       -> ima_file_free()

   What it does is to call back into the filesystem to update the file's
   IMA xattr. Querying the inode without using vfs_getattr_nosec() meant
   that IMA didn't handle stacking filesystems such as overlayfs
   correctly. So the switch to vfs_getattr_nosec() is quite correct. But
   the switch to vfs_getattr_nosec() revealed another bug when used on
   stacking filesystems:

     __fput()
       -> ima_file_free()
          -> vfs_getattr_nosec()
             -> i_op->getattr::ovl_getattr()
                -> vfs_getattr()
                   -> i_op->getattr::$WHATEVER_UNDERLYING_FS_getattr()
                      -> security_inode_getattr() # calls back into LSMs

   Now, if that __fput() happens from task_work_run() of an exiting task
   current->fs and various other pointer could already be NULL. So
   anything in the LSM layer relying on that not being NULL would be
   quite surprised.

   Fix that by passing the information that this is a security request
   through to the stacking filesystem by adding a new internal
   ATT_GETATTR_NOSEC flag. Now the callchain becomes:

     __fput()
       -> ima_file_free()
          -> vfs_getattr_nosec()
             -> i_op->getattr::ovl_getattr()
                -> if (AT_GETATTR_NOSEC)
                          vfs_getattr_nosec()
                   else
                          vfs_getattr()
                   -> i_op->getattr::$WHATEVER_UNDERLYING_FS_getattr()

 - Fix a bug introduced with the iov_iter rework from last cycle.

   This broke /proc/kcore by copying too much and without the correct
   offset.

 - Add a missing NULL check when allocating the root inode in
   autofs_fill_super().

 - Fix stable writes for multi-device filesystems (xfs, btrfs etc) and
   the block device pseudo filesystem.

   Stable writes used to be a superblock flag only, making it a per
   filesystem property. Add an additional AS_STABLE_WRITES mapping flag
   to allow for fine-grained control.

 - Ensure that offset_iterate_dir() returns 0 after reaching the end of
   a directory so it adheres to getdents() convention.

* tag 'vfs-6.7-rc3.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  libfs: getdents() should return 0 after reaching EOD
  xfs: respect the stable writes flag on the RT device
  xfs: clean up FS_XFLAG_REALTIME handling in xfs_ioctl_setattr_xflags
  block: update the stable_writes flag in bdev_add
  filemap: add a per-mapping stable writes flag
  autofs: add: new_inode check in autofs_fill_super()
  iov_iter: fix copy_page_to_iter_nofault()
  fs: Pass AT_GETATTR_NOSEC flag to getattr interface function

Pull drm fixes from Dave Airlie:
 "Back to regular scheduled fixes pull request, mainly a bunch of msm,
  some i915 and otherwise a few scattered, one memory crasher in the
  nouveau GSP paths is helping stabilise that work.

  msm:
   - Fix the VREG_CTRL_1 for 4nm CPHY to match downstream
   - Remove duplicate call to drm_kms_helper_poll_init() in
     msm_drm_init()
   - Fix the safe_lut_tbl[] for sc8280xp to match downstream
   - Don't attach the drm_dp_set_subconnector_property() for eDP
   - Fix to attach drm_dp_set_subconnector_property() for DP. Otherwise
     there is a bootup crash on multiple targets
   - Remove unnecessary NULL check left behind during cleanup

  i915:
   - Fix race between DP MST connectore registration and setup
   - Fix GT memory leak on probe error path

  panel:
   - Fixes for innolux and auo,b101uan08.3 panel.
   - Fix Himax83102-j02 timings.

  ivpu:
   - Fix ivpu MMIO reset.

  ast:
   - AST fix on connetor disconnection.

  nouveau:
   - gsp memory corruption fix

  rockchip:
   - color fix"

* tag 'drm-fixes-2023-11-24' of git://anongit.freedesktop.org/drm/drm:
  nouveau/gsp: allocate enough space for all channel ids.
  drm/panel: boe-tv101wum-nl6: Fine tune Himax83102-j02 panel HFP and HBP
  drm/ast: Disconnect BMC if physical connector is connected
  accel/ivpu/37xx: Fix hangs related to MMIO reset
  drm/rockchip: vop: Fix color for RGB888/BGR888 format on VOP full
  drm/i915: do not clean GT table on error path
  drm/i915/dp_mst: Fix race between connector registration and setup
  drm/panel: simple: Fix Innolux G101ICE-L01 timings
  drm/panel: simple: Fix Innolux G101ICE-L01 bus flags
  drm/msm: remove unnecessary NULL check
  drm/panel: auo,b101uan08.3: Fine tune the panel power sequence
  drm/msm/dp: attach the DP subconnector property
  drm/msm/dp: don't touch DP subconnector property in eDP case
  drm/msm/dpu: Add missing safe_lut_tbl in sc8280xp catalog
  drm/msm: remove exra drm_kms_helper_poll_init() call
  drm/msm/dsi: use the correct VREG_CTRL_1 value for 4nm cphy

Merge tag 'usb-serial-6.7-rc3' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-linus

Johan writes:

USB-serial fixes for 6.7-rc3

Here are a couple of modem device entry fixes and some new modem device
ids.

All have been in linux-next with no reported issues.

* tag 'usb-serial-6.7-rc3' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial: (329 commits)
  USB: serial: option: add Luat Air72*U series products
  USB: serial: option: add Fibocom L7xx modules
  USB: serial: option: fix FM101R-GL defines
  USB: serial: option: don't claim interface 4 for ZTE MF290
  Linux 6.7-rc2
  prctl: Disable prctl(PR_SET_MDWE) on parisc
  parisc/power: Fix power soft-off when running on qemu
  parisc: Replace strlcpy() with strscpy()
  NFSD: Fix checksum mismatches in the duplicate reply cache
  NFSD: Fix "start of NFS reply" pointer passed to nfsd_cache_update()
  NFSD: Update nfsd_cache_append() to use xdr_stream
  nfsd: fix file memleak on client_opens_release
  dm-crypt: start allocating with MAX_ORDER
  dm-verity: don't use blocking calls from tasklets
  dm-bufio: fix no-sleep mode
  dm-delay: avoid duplicate logic
  dm-delay: fix bugs introduced by kthread mode
  dm-delay: fix a race between delay_presuspend and delay_bio
  drm/amdgpu/gmc9: disable AGP aperture
  drm/amdgpu/gmc10: disable AGP aperture
  ...

Mark a superblock that is for for an R/O or Backup volume as SB_RDONLY when
mounting it.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

AFS doesn't really do locking on R/O volumes as fileservers don't maintain
state with each other and thus a lock on a R/O volume file on one
fileserver will not be be visible to someone looking at the same file on
another fileserver.

Further, the server may return an error if you try it.

Fix this by doing what other AFS clients do and handle filelocking on R/O
volume files entirely within the client and don't touch the server.

Fixes: 6c6c1d63 ("afs: Provide mount-time configurable byte-range file locking emulation")
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

Make AFS return error ENOENT if no cell SRV or AFSDB DNS record (or
cellservdb config file record) can be found rather than returning
EDESTADDRREQ.

Also add cell name lookup info to the cursor dump.

Fixes: d5c32c89 ("afs: Fix cell DNS lookup")
Reported-by: Markus Suvanto <markus.suvanto@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216637Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org

Kent reported an occasional KASAN splat in lockdep. Mark then noted:

> I suspect the dodgy access is to chain_block_buckets[-1], which hits the last 4
> bytes of the redzone and gets (incorrectly/misleadingly) attributed to
> nr_large_chain_blocks.

That would mean @size == 0, at which point size_to_bucket() returns -1
and the above happens.

alloc_chain_hlocks() has 'size - req', for the first with the
precondition 'size >= rq', which allows the 0.

This code is trying to split a block, del_chain_block() takes what we
need, and add_chain_block() puts back the remainder, except in the
above case the remainder is 0 sized and things go sideways.

Fixes: 810507fe ("locking/lockdep: Reuse freed chain_hlocks entries")
Reported-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Kent Overstreet <kent.overstreet@linux.dev>
Link: https://lkml.kernel.org/r/20231121114126.GH8262@noisy.programming.kicks-ass.net

Pull ata fix from Damien Le Moal:

 - Add a missing error check in the adapter initialization of the
   pata_isapnp driver (Chen)

* tag 'ata-6.7-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
  ata: pata_isapnp: Add missing error check for devm_ioport_map()