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

Pull arm64 updates from Catalin Marinas:

 - Support for arm64 SME 2 and 2.1. SME2 introduces a new 512-bit
   architectural register (ZT0, for the look-up table feature) that
   Linux needs to save/restore

 - Include TPIDR2 in the signal context and add the corresponding
   kselftests

 - Perf updates: Arm SPEv1.2 support, HiSilicon uncore PMU updates, ACPI
   support to the Marvell DDR and TAD PMU drivers, reset DTM_PMU_CONFIG
   (ARM CMN) at probe time

 - Support for DYNAMIC_FTRACE_WITH_CALL_OPS on arm64

 - Permit EFI boot with MMU and caches on. Instead of cleaning the
   entire loaded kernel image to the PoC and disabling the MMU and
   caches before branching to the kernel bare metal entry point, leave
   the MMU and caches enabled and rely on EFI's cacheable 1:1 mapping of
   all of system RAM to populate the initial page tables

 - Expose the AArch32 (compat) ELF_HWCAP features to user in an arm64
   kernel (the arm32 kernel only defines the values)

 - Harden the arm64 shadow call stack pointer handling: stash the shadow
   stack pointer in the task struct on interrupt, load it directly from
   this structure

 - Signal handling cleanups to remove redundant validation of size
   information and avoid reading the same data from userspace twice

 - Refactor the hwcap macros to make use of the automatically generated
   ID registers. It should make new hwcaps writing less error prone

 - Further arm64 sysreg conversion and some fixes

 - arm64 kselftest fixes and improvements

 - Pointer authentication cleanups: don't sign leaf functions, unify
   asm-arch manipulation

 - Pseudo-NMI code generation optimisations

 - Minor fixes for SME and TPIDR2 handling

 - Miscellaneous updates: ARCH_FORCE_MAX_ORDER is now selectable,
   replace strtobool() to kstrtobool() in the cpufeature.c code, apply
   dynamic shadow call stack in two passes, intercept pfn changes in
   set_pte_at() without the required break-before-make sequence, attempt
   to dump all instructions on unhandled kernel faults

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (130 commits)
  arm64: fix .idmap.text assertion for large kernels
  kselftest/arm64: Don't require FA64 for streaming SVE+ZA tests
  kselftest/arm64: Copy whole EXTRA context
  arm64: kprobes: Drop ID map text from kprobes blacklist
  perf: arm_spe: Print the version of SPE detected
  perf: arm_spe: Add support for SPEv1.2 inverted event filtering
  perf: Add perf_event_attr::config3
  arm64/sme: Fix __finalise_el2 SMEver check
  drivers/perf: fsl_imx8_ddr_perf: Remove set-but-not-used variable
  arm64/signal: Only read new data when parsing the ZT context
  arm64/signal: Only read new data when parsing the ZA context
  arm64/signal: Only read new data when parsing the SVE context
  arm64/signal: Avoid rereading context frame sizes
  arm64/signal: Make interface for restore_fpsimd_context() consistent
  arm64/signal: Remove redundant size validation from parse_user_sigframe()
  arm64/signal: Don't redundantly verify FPSIMD magic
  arm64/cpufeature: Use helper macros to specify hwcaps
  arm64/cpufeature: Always use symbolic name for feature value in hwcaps
  arm64/sysreg: Initial unsigned annotations for ID registers
  arm64/sysreg: Initial annotation of signed ID registers
  ...

1 files changed, 30 insertions, 40 deletions

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index d7dfe00df7d2..2d49aea0ff67 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -63,50 +63,37 @@ stack_protector_prepare: prepare0
 					include/generated/asm-offsets.h))
 endif
 
-ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
-# make sure to pass the newest target architecture to -march.
-asm-arch := armv8.2-a
-endif
-
-# Ensure that if the compiler supports branch protection we default it
-# off, this will be overridden if we are using branch protection.
-branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)
-
-ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
-branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
-# We enable additional protection for leaf functions as there is some
-# narrow potential for ROP protection benefits and no substantial
-# performance impact has been observed.
-PACRET-y := pac-ret+leaf
-
-# Using a shadow call stack in leaf functions is too costly, so avoid PAC there
-# as well when we may be patching PAC into SCS
-PACRET-$(CONFIG_UNWIND_PATCH_PAC_INTO_SCS) := pac-ret
-
 ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
-branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=$(PACRET-y)+bti
+  KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
+else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
+  ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
+    KBUILD_CFLAGS += -mbranch-protection=pac-ret
+  else
+    KBUILD_CFLAGS += -msign-return-address=non-leaf
+  endif
 else
-branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=$(PACRET-y)
-endif
-# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the
-# compiler to generate them and consequently to break the single image contract
-# we pass it only to the assembler. This option is utilized only in case of non
-# integrated assemblers.
-ifeq ($(CONFIG_AS_HAS_PAC), y)
-asm-arch := armv8.3-a
-endif
-endif
-
-KBUILD_CFLAGS += $(branch-prot-flags-y)
-
-ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
-# make sure to pass the newest target architecture to -march.
-asm-arch := armv8.4-a
+  KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
 endif
 
+# Tell the assembler to support instructions from the latest target
+# architecture.
+#
+# For non-integrated assemblers we'll pass this on the command line, and for
+# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
+# inline usage.
+#
+# We cannot pass the same arch flag to the compiler as this would allow it to
+# freely generate instructions which are not supported by earlier architecture
+# versions, which would prevent a single kernel image from working on earlier
+# hardware.
 ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
-# make sure to pass the newest target architecture to -march.
-asm-arch := armv8.5-a
+  asm-arch := armv8.5-a
+else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
+  asm-arch := armv8.4-a
+else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
+  asm-arch := armv8.3-a
+else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
+  asm-arch := armv8.2-a
 endif
 
 ifdef asm-arch
@@ -139,7 +126,10 @@ endif
 
 CHECKFLAGS	+= -D__aarch64__
 
-ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
+ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y)
+  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
+  CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
+else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y)
   KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
   CC_FLAGS_FTRACE := -fpatchable-function-entry=2
 endif