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

…el/git/arm64/linux

Pull arm64 updates from Will Deacon:
 "There's a reasonable amount here and the juicy details are all below.

  It's worth noting that the MTE/KASAN changes strayed outside of our
  usual directories due to core mm changes and some associated changes
  to some other architectures; Andrew asked for us to carry these [1]
  rather that take them via the -mm tree.

  Summary:

   - Optimise SVE switching for CPUs with 128-bit implementations.

   - Fix output format from SVE selftest.

   - Add support for versions v1.2 and 1.3 of the SMC calling
     convention.

   - Allow Pointer Authentication to be configured independently for
     kernel and userspace.

   - PMU driver cleanups for managing IRQ affinity and exposing event
     attributes via sysfs.

   - KASAN optimisations for both hardware tagging (MTE) and out-of-line
     software tagging implementations.

   - Relax frame record alignment requirements to facilitate 8-byte
     alignment with KASAN and Clang.

   - Cleanup of page-table definitions and removal of unused memory
     types.

   - Reduction of ARCH_DMA_MINALIGN back to 64 bytes.

   - Refactoring of our instruction decoding routines and addition of
     some missing encodings.

   - Move entry code moved into C and hardened against harmful compiler
     instrumentation.

   - Update booting requirements for the FEAT_HCX feature, added to v8.7
     of the architecture.

   - Fix resume from idle when pNMI is being used.

   - Additional CPU sanity checks for MTE and preparatory changes for
     systems where not all of the CPUs support 32-bit EL0.

   - Update our kernel string routines to the latest Cortex Strings
     implementation.

   - Big cleanup of our cache maintenance routines, which were
     confusingly named and inconsistent in their implementations.

   - Tweak linker flags so that GDB can understand vmlinux when using
     RELR relocations.

   - Boot path cleanups to enable early initialisation of per-cpu
     operations needed by KCSAN.

   - Non-critical fixes and miscellaneous cleanup"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (150 commits)
  arm64: tlb: fix the TTL value of tlb_get_level
  arm64: Restrict undef hook for cpufeature registers
  arm64/mm: Rename ARM64_SWAPPER_USES_SECTION_MAPS
  arm64: insn: avoid circular include dependency
  arm64: smp: Bump debugging information print down to KERN_DEBUG
  drivers/perf: fix the missed ida_simple_remove() in ddr_perf_probe()
  perf/arm-cmn: Fix invalid pointer when access dtc object sharing the same IRQ number
  arm64: suspend: Use cpuidle context helpers in cpu_suspend()
  PSCI: Use cpuidle context helpers in psci_cpu_suspend_enter()
  arm64: Convert cpu_do_idle() to using cpuidle context helpers
  arm64: Add cpuidle context save/restore helpers
  arm64: head: fix code comments in set_cpu_boot_mode_flag
  arm64: mm: drop unused __pa(__idmap_text_start)
  arm64: mm: fix the count comments in compute_indices
  arm64/mm: Fix ttbr0 values stored in struct thread_info for software-pan
  arm64: mm: Pass original fault address to handle_mm_fault()
  arm64/mm: Drop SECTION_[SHIFT|SIZE|MASK]
  arm64/mm: Use CONT_PMD_SHIFT for ARM64_MEMSTART_SHIFT
  arm64/mm: Drop SWAPPER_INIT_MAP_SIZE
  arm64: Conditionally configure PTR_AUTH key of the kernel.
  ...

Documentation/arm64/booting.rst

@@ -277,6 +277,12 @@ Before jumping into the kernel, the following conditions must be met:
 
     - SCR_EL3.FGTEn (bit 27) must be initialised to 0b1.
 
+  For CPUs with support for HCRX_EL2 (FEAT_HCX) present:
+
+  - If EL3 is present and the kernel is entered at EL2:
+
+    - SCR_EL3.HXEn (bit 38) must be initialised to 0b1.
+
   For CPUs with Advanced SIMD and floating point support:
 
   - If EL3 is present:

Makefile

@@ -1039,7 +1039,7 @@ LDFLAGS_vmlinux	+= $(call ld-option, -X,)
 endif
 
 ifeq ($(CONFIG_RELR),y)
-LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
+LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr --use-android-relr-tags
 endif
 
 # We never want expected sections to be placed heuristically by the

arch/alpha/include/asm/page.h

@@ -17,9 +17,9 @@
 extern void clear_page(void *page);
 #define clear_user_page(page, vaddr, pg)	clear_page(page)
 
-#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
-	alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vmaddr)
-#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
+#define alloc_zeroed_user_highpage_movable(vma, vaddr) \
+	alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vmaddr)
+#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE
 
 extern void copy_page(void * _to, void * _from);
 #define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

arch/arm/include/asm/cpuidle.h

@@ -50,4 +50,9 @@ extern int arm_cpuidle_suspend(int index);
 
 extern int arm_cpuidle_init(int cpu);
 
+struct arm_cpuidle_irq_context { };
+
+#define arm_cpuidle_save_irq_context(c)		(void)c
+#define arm_cpuidle_restore_irq_context(c)	(void)c
+
 #endif

arch/arm/kernel/perf_event_v7.c

@@ -773,10 +773,10 @@ static inline void armv7pmu_write_counter(struct perf_event *event, u64 value)
 		pr_err("CPU%u writing wrong counter %d\n",
 			smp_processor_id(), idx);
 	} else if (idx == ARMV7_IDX_CYCLE_COUNTER) {
-		asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (value));
+		asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" ((u32)value));
 	} else {
 		armv7_pmnc_select_counter(idx);
-		asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (value));
+		asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" ((u32)value));
 	}
 }
 

arch/arm64/Kconfig

@@ -1481,12 +1481,6 @@ menu "ARMv8.3 architectural features"
 config ARM64_PTR_AUTH
 	bool "Enable support for pointer authentication"
 	default y
-	depends on (CC_HAS_SIGN_RETURN_ADDRESS || CC_HAS_BRANCH_PROT_PAC_RET) && AS_HAS_PAC
-	# Modern compilers insert a .note.gnu.property section note for PAC
-	# which is only understood by binutils starting with version 2.33.1.
-	depends on LD_IS_LLD || LD_VERSION >= 23301 || (CC_IS_GCC && GCC_VERSION < 90100)
-	depends on !CC_IS_CLANG || AS_HAS_CFI_NEGATE_RA_STATE
-	depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)
 	help
 	  Pointer authentication (part of the ARMv8.3 Extensions) provides
 	  instructions for signing and authenticating pointers against secret
@@ -1498,13 +1492,6 @@ config ARM64_PTR_AUTH
 	  for each process at exec() time, with these keys being
 	  context-switched along with the process.
 
-	  If the compiler supports the -mbranch-protection or
-	  -msign-return-address flag (e.g. GCC 7 or later), then this option
-	  will also cause the kernel itself to be compiled with return address
-	  protection. In this case, and if the target hardware is known to
-	  support pointer authentication, then CONFIG_STACKPROTECTOR can be
-	  disabled with minimal loss of protection.
-
 	  The feature is detected at runtime. If the feature is not present in
 	  hardware it will not be advertised to userspace/KVM guest nor will it
 	  be enabled.
@@ -1515,6 +1502,24 @@ config ARM64_PTR_AUTH
 	  but with the feature disabled. On such a system, this option should
 	  not be selected.
 
+config ARM64_PTR_AUTH_KERNEL
+	bool "Use pointer authentication for kernel"
+	default y
+	depends on ARM64_PTR_AUTH
+	depends on (CC_HAS_SIGN_RETURN_ADDRESS || CC_HAS_BRANCH_PROT_PAC_RET) && AS_HAS_PAC
+	# Modern compilers insert a .note.gnu.property section note for PAC
+	# which is only understood by binutils starting with version 2.33.1.
+	depends on LD_IS_LLD || LD_VERSION >= 23301 || (CC_IS_GCC && GCC_VERSION < 90100)
+	depends on !CC_IS_CLANG || AS_HAS_CFI_NEGATE_RA_STATE
+	depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS)
+	help
+	  If the compiler supports the -mbranch-protection or
+	  -msign-return-address flag (e.g. GCC 7 or later), then this option
+	  will cause the kernel itself to be compiled with return address
+	  protection. In this case, and if the target hardware is known to
+	  support pointer authentication, then CONFIG_STACKPROTECTOR can be
+	  disabled with minimal loss of protection.
+
 	  This feature works with FUNCTION_GRAPH_TRACER option only if
 	  DYNAMIC_FTRACE_WITH_REGS is enabled.
 
@@ -1606,7 +1611,7 @@ config ARM64_BTI_KERNEL
 	bool "Use Branch Target Identification for kernel"
 	default y
 	depends on ARM64_BTI
-	depends on ARM64_PTR_AUTH
+	depends on ARM64_PTR_AUTH_KERNEL
 	depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI
 	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697
 	depends on !CC_IS_GCC || GCC_VERSION >= 100100

arch/arm64/Makefile

@@ -70,7 +70,7 @@ endif
 # off, this will be overridden if we are using branch protection.
 branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)
 
-ifeq ($(CONFIG_ARM64_PTR_AUTH),y)
+ifeq ($(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

arch/arm64/include/asm/alternative-macros.h

@@ -3,12 +3,10 @@
 #define __ASM_ALTERNATIVE_MACROS_H
 
 #include <asm/cpucaps.h>
+#include <asm/insn-def.h>
 
 #define ARM64_CB_PATCH ARM64_NCAPS
 
-/* A64 instructions are always 32 bits. */
-#define	AARCH64_INSN_SIZE		4
-
 #ifndef __ASSEMBLY__
 
 #include <linux/stringify.h>
@@ -197,11 +195,6 @@ alternative_endif
 #define _ALTERNATIVE_CFG(insn1, insn2, cap, cfg, ...)	\
 	alternative_insn insn1, insn2, cap, IS_ENABLED(cfg)
 
-.macro user_alt, label, oldinstr, newinstr, cond
-9999:	alternative_insn "\oldinstr", "\newinstr", \cond
-	_asm_extable 9999b, \label
-.endm
-
 #endif  /*  __ASSEMBLY__  */
 
 /*

arch/arm64/include/asm/arch_gicv3.h

@@ -124,7 +124,8 @@ static inline u32 gic_read_rpr(void)
 #define gic_read_lpir(c)		readq_relaxed(c)
 #define gic_write_lpir(v, c)		writeq_relaxed(v, c)
 
-#define gic_flush_dcache_to_poc(a,l)	__flush_dcache_area((a), (l))
+#define gic_flush_dcache_to_poc(a,l)	\
+	dcache_clean_inval_poc((unsigned long)(a), (unsigned long)(a)+(l))
 
 #define gits_read_baser(c)		readq_relaxed(c)
 #define gits_write_baser(v, c)		writeq_relaxed(v, c)

arch/arm64/include/asm/asm-prototypes.h

@@ -23,4 +23,10 @@ long long __ashlti3(long long a, int b);
 long long __ashrti3(long long a, int b);
 long long __lshrti3(long long a, int b);
 
+/*
+ * This function uses a custom calling convention and cannot be called from C so
+ * this prototype is not entirely accurate.
+ */
+void __hwasan_tag_mismatch(unsigned long addr, unsigned long access_info);
+
 #endif /* __ASM_PROTOTYPES_H */

arch/arm64/include/asm/asm_pointer_auth.h

@@ -7,19 +7,7 @@
 #include <asm/cpufeature.h>
 #include <asm/sysreg.h>
 
-#ifdef CONFIG_ARM64_PTR_AUTH
-/*
- * thread.keys_user.ap* as offset exceeds the #imm offset range
- * so use the base value of ldp as thread.keys_user and offset as
- * thread.keys_user.ap*.
- */
-	.macro __ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3
-	mov	\tmp1, #THREAD_KEYS_USER
-	add	\tmp1, \tsk, \tmp1
-	ldp	\tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APIA]
-	msr_s	SYS_APIAKEYLO_EL1, \tmp2
-	msr_s	SYS_APIAKEYHI_EL1, \tmp3
-	.endm
+#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL
 
 	.macro __ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
 	mov	\tmp1, #THREAD_KEYS_KERNEL
@@ -42,6 +30,33 @@ alternative_if ARM64_HAS_ADDRESS_AUTH
 alternative_else_nop_endif
 	.endm
 
+#else /* CONFIG_ARM64_PTR_AUTH_KERNEL */
+
+	.macro __ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
+	.endm
+
+	.macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
+	.endm
+
+	.macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3
+	.endm
+
+#endif /* CONFIG_ARM64_PTR_AUTH_KERNEL */
+
+#ifdef CONFIG_ARM64_PTR_AUTH
+/*
+ * thread.keys_user.ap* as offset exceeds the #imm offset range
+ * so use the base value of ldp as thread.keys_user and offset as
+ * thread.keys_user.ap*.
+ */
+	.macro __ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3
+	mov	\tmp1, #THREAD_KEYS_USER
+	add	\tmp1, \tsk, \tmp1
+	ldp	\tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APIA]
+	msr_s	SYS_APIAKEYLO_EL1, \tmp2
+	msr_s	SYS_APIAKEYHI_EL1, \tmp3
+	.endm
+
 	.macro __ptrauth_keys_init_cpu tsk, tmp1, tmp2, tmp3
 	mrs	\tmp1, id_aa64isar1_el1
 	ubfx	\tmp1, \tmp1, #ID_AA64ISAR1_APA_SHIFT, #8
@@ -64,17 +79,11 @@ alternative_else_nop_endif
 .Lno_addr_auth\@:
 	.endm
 
-#else /* CONFIG_ARM64_PTR_AUTH */
+#else /* !CONFIG_ARM64_PTR_AUTH */
 
 	.macro ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3
 	.endm
 
-	.macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3
-	.endm
-
-	.macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3
-	.endm
-
 #endif /* CONFIG_ARM64_PTR_AUTH */
 
 #endif /* __ASM_ASM_POINTER_AUTH_H */