Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64...

Pull arm64 updates from Will Deacon:
 "A sizeable pile of arm64 updates for 5.8.

  Summary below, but the big two features are support for Branch Target
  Identification and Clang's Shadow Call stack. The latter is currently
  arm64-only, but the high-level parts are all in core code so it could
  easily be adopted by other architectures pending toolchain support

  Branch Target Identification (BTI):

   - Support for ARMv8.5-BTI in both user- and kernel-space. This allows
     branch targets to limit the types of branch from which they can be
     called and additionally prevents branching to arbitrary code,
     although kernel support requires a very recent toolchain.

   - Function annotation via SYM_FUNC_START() so that assembly functions
     are wrapped with the relevant "landing pad" instructions.

   - BPF and vDSO updates to use the new instructions.

   - Addition of a new HWCAP and exposure of BTI capability to userspace
     via ID register emulation, along with ELF loader support for the
     BTI feature in .note.gnu.property.

   - Non-critical fixes to CFI unwind annotations in the sigreturn
     trampoline.

  Shadow Call Stack (SCS):

   - Support for Clang's Shadow Call Stack feature, which reserves
     platform register x18 to point at a separate stack for each task
     that holds only return addresses. This protects function return
     control flow from buffer overruns on the main stack.

   - Save/restore of x18 across problematic boundaries (user-mode,
     hypervisor, EFI, suspend, etc).

   - Core support for SCS, should other architectures want to use it
     too.

   - SCS overflow checking on context-switch as part of the existing
     stack limit check if CONFIG_SCHED_STACK_END_CHECK=y.

  CPU feature detection:

   - Removed numerous "SANITY CHECK" errors when running on a system
     with mismatched AArch32 support at EL1. This is primarily a concern
     for KVM, which disabled support for 32-bit guests on such a system.

   - Addition of new ID registers and fields as the architecture has
     been extended.

  Perf and PMU drivers:

   - Minor fixes and cleanups to system PMU drivers.

  Hardware errata:

   - Unify KVM workarounds for VHE and nVHE configurations.

   - Sort vendor errata entries in Kconfig.

  Secure Monitor Call Calling Convention (SMCCC):

   - Update to the latest specification from Arm (v1.2).

   - Allow PSCI code to query the SMCCC version.

  Software Delegated Exception Interface (SDEI):

   - Unexport a bunch of unused symbols.

   - Minor fixes to handling of firmware data.

  Pointer authentication:

   - Add support for dumping the kernel PAC mask in vmcoreinfo so that
     the stack can be unwound by tools such as kdump.

   - Simplification of key initialisation during CPU bringup.

  BPF backend:

   - Improve immediate generation for logical and add/sub instructions.

  vDSO:

   - Minor fixes to the linker flags for consistency with other
     architectures and support for LLVM's unwinder.

   - Clean up logic to initialise and map the vDSO into userspace.

  ACPI:

   - Work around for an ambiguity in the IORT specification relating to
     the "num_ids" field.

   - Support _DMA method for all named components rather than only PCIe
     root complexes.

   - Minor other IORT-related fixes.

  Miscellaneous:

   - Initialise debug traps early for KGDB and fix KDB cacheflushing
     deadlock.

   - Minor tweaks to early boot state (documentation update, set
     TEXT_OFFSET to 0x0, increase alignment of PE/COFF sections).

   - Refactoring and cleanup"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (148 commits)
  KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h
  KVM: arm64: Check advertised Stage-2 page size capability
  arm64/cpufeature: Add get_arm64_ftr_reg_nowarn()
  ACPI/IORT: Remove the unused __get_pci_rid()
  arm64/cpuinfo: Add ID_MMFR4_EL1 into the cpuinfo_arm64 context
  arm64/cpufeature: Add remaining feature bits in ID_AA64PFR1 register
  arm64/cpufeature: Add remaining feature bits in ID_AA64PFR0 register
  arm64/cpufeature: Add remaining feature bits in ID_AA64ISAR0 register
  arm64/cpufeature: Add remaining feature bits in ID_MMFR4 register
  arm64/cpufeature: Add remaining feature bits in ID_PFR0 register
  arm64/cpufeature: Introduce ID_MMFR5 CPU register
  arm64/cpufeature: Introduce ID_DFR1 CPU register
  arm64/cpufeature: Introduce ID_PFR2 CPU register
  arm64/cpufeature: Make doublelock a signed feature in ID_AA64DFR0
  arm64/cpufeature: Drop TraceFilt feature exposure from ID_DFR0 register
  arm64/cpufeature: Add explicit ftr_id_isar0[] for ID_ISAR0 register
  arm64: mm: Add asid_gen_match() helper
  firmware: smccc: Fix missing prototype warning for arm_smccc_version_init
  arm64: vdso: Fix CFI directives in sigreturn trampoline
  arm64: vdso: Don't prefix sigreturn trampoline with a BTI C instruction
  ...

diff --cc MAINTAINERS
Simple merge

diff --cc Makefile
Simple merge

diff --cc arch/arm64/Kconfig
Simple merge

diff --cc arch/arm64/kernel/efi-entry.S
Simple merge

diff --cc arch/arm64/kernel/efi-header.S
Simple merge

diff --cc arch/arm64/kernel/ptrace.c
Simple merge

diff --cc arch/arm64/kernel/sdei.c
Simple merge

diff --cc arch/arm64/kernel/smp.c
Simple merge

diff --cc arch/arm64/kernel/traps.c
Simple merge

diff --cc arch/arm64/kernel/vdso/Makefile
Simple merge

diff --cc arch/arm64/kvm/hyp/sysreg-sr.c
Simple merge

diff --cc arch/x86/Kconfig
Simple merge

diff --cc arch/x86/entry/entry_32.S
Simple merge

diff --cc arch/x86/include/asm/traps.h
Simple merge

diff --cc arch/x86/kernel/traps.c
Simple merge

diff --cc drivers/firmware/efi/libstub/Makefile
index 034d71663b1e9cce2a71cfae71f1f1f65a0bc358,b52ae8c29560d92f677759d842090c31b879752b..cce4a7436052502769d1da47ae724431709cfc71
--- 1/drivers/firmware/efi/libstub/Makefile
--- 2/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@@ -30,9 -30,11 +30,12 @@@ KBUILD_CFLAGS                       := $(cflags-y) -Os -DDI
                                   -D__NO_FORTIFY \
                                   $(call cc-option,-ffreestanding) \
                                   $(call cc-option,-fno-stack-protector) \
 +                                 $(call cc-option,-fno-addrsig) \
                                   -D__DISABLE_EXPORTS
  
+ # remove SCS flags from all objects in this directory
+ KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
+ 
  GCOV_PROFILE                  := n
  KASAN_SANITIZE                        := n
  UBSAN_SANITIZE                        := n

diff --cc drivers/perf/arm_spe_pmu.c
Simple merge

diff --cc fs/binfmt_elf.c
Simple merge

diff --cc fs/proc/task_mmu.c
Simple merge

diff --cc include/linux/compiler_types.h
Simple merge

diff --cc include/linux/mm.h
Simple merge

diff --cc init/init_task.c
Simple merge

diff --cc kernel/fork.c
Simple merge

diff --cc kernel/sched/core.c
Simple merge

diff --cc lib/Kconfig
Simple merge

diff --cc mm/page_alloc.c
Simple merge

diff --cc tools/testing/selftests/wireguard/qemu/debug.config
Simple merge