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

Pull arm64 updates from Catalin Marinas:
 "Apart from some new arm64 features and clean-ups, this also contains
  the core mmu_gather changes for tracking the levels of the page table
  being cleared and a minor update to the generic
  compat_sys_sigaltstack() introducing COMPAT_SIGMINSKSZ.

  Summary:

   - Core mmu_gather changes which allow tracking the levels of
     page-table being cleared together with the arm64 low-level flushing
     routines

   - Support for the new ARMv8.5 PSTATE.SSBS bit which can be used to
     mitigate Spectre-v4 dynamically without trapping to EL3 firmware

   - Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack

   - Optimise emulation of MRS instructions to ID_* registers on ARMv8.4

   - Support for Common Not Private (CnP) translations allowing threads
     of the same CPU to share the TLB entries

   - Accelerated crc32 routines

   - Move swapper_pg_dir to the rodata section

   - Trap WFI instruction executed in user space

   - ARM erratum 1188874 workaround (arch_timer)

   - Miscellaneous fixes and clean-ups"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (78 commits)
  arm64: KVM: Guests can skip __install_bp_hardening_cb()s HYP work
  arm64: cpufeature: Trap CTR_EL0 access only where it is necessary
  arm64: cpufeature: Fix handling of CTR_EL0.IDC field
  arm64: cpufeature: ctr: Fix cpu capability check for late CPUs
  Documentation/arm64: HugeTLB page implementation
  arm64: mm: Use __pa_symbol() for set_swapper_pgd()
  arm64: Add silicon-errata.txt entry for ARM erratum 1188873
  Revert "arm64: uaccess: implement unsafe accessors"
  arm64: mm: Drop the unused cpu parameter
  MAINTAINERS: fix bad sdei paths
  arm64: mm: Use #ifdef for the __PAGETABLE_P?D_FOLDED defines
  arm64: Fix typo in a comment in arch/arm64/mm/kasan_init.c
  arm64: xen: Use existing helper to check interrupt status
  arm64: Use daifflag_restore after bp_hardening
  arm64: daifflags: Use irqflags functions for daifflags
  arm64: arch_timer: avoid unused function warning
  arm64: Trap WFI executed in userspace
  arm64: docs: Document SSBS HWCAP
  arm64: docs: Fix typos in ELF hwcaps
  arm64/kprobes: remove an extra semicolon in arch_prepare_kprobe
  ...

1 files changed, 15 insertions, 23 deletions

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 50b30ff30de4..d0e638ef3af6 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -37,6 +37,7 @@
 #include <asm/cmpxchg.h>
 #include <asm/cpufeature.h>
 #include <asm/exception.h>
+#include <asm/daifflags.h>
 #include <asm/debug-monitors.h>
 #include <asm/esr.h>
 #include <asm/sysreg.h>
@@ -56,10 +57,16 @@ struct fault_info {
 };
 
 static const struct fault_info fault_info[];
+static struct fault_info debug_fault_info[];
 
 static inline const struct fault_info *esr_to_fault_info(unsigned int esr)
 {
-	return fault_info + (esr & 63);
+	return fault_info + (esr & ESR_ELx_FSC);
+}
+
+static inline const struct fault_info *esr_to_debug_fault_info(unsigned int esr)
+{
+	return debug_fault_info + DBG_ESR_EVT(esr);
 }
 
 #ifdef CONFIG_KPROBES
@@ -235,9 +242,8 @@ static bool is_el1_instruction_abort(unsigned int esr)
 	return ESR_ELx_EC(esr) == ESR_ELx_EC_IABT_CUR;
 }
 
-static inline bool is_el1_permission_fault(unsigned int esr,
-					   struct pt_regs *regs,
-					   unsigned long addr)
+static inline bool is_el1_permission_fault(unsigned long addr, unsigned int esr,
+					   struct pt_regs *regs)
 {
 	unsigned int ec       = ESR_ELx_EC(esr);
 	unsigned int fsc_type = esr & ESR_ELx_FSC_TYPE;
@@ -283,7 +289,7 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
 	if (!is_el1_instruction_abort(esr) && fixup_exception(regs))
 		return;
 
-	if (is_el1_permission_fault(esr, regs, addr)) {
+	if (is_el1_permission_fault(addr, esr, regs)) {
 		if (esr & ESR_ELx_WNR)
 			msg = "write to read-only memory";
 		else
@@ -454,7 +460,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 		mm_flags |= FAULT_FLAG_WRITE;
 	}
 
-	if (addr < TASK_SIZE && is_el1_permission_fault(esr, regs, addr)) {
+	if (addr < TASK_SIZE && is_el1_permission_fault(addr, esr, regs)) {
 		/* regs->orig_addr_limit may be 0 if we entered from EL0 */
 		if (regs->orig_addr_limit == KERNEL_DS)
 			die_kernel_fault("access to user memory with fs=KERNEL_DS",
@@ -771,7 +777,7 @@ asmlinkage void __exception do_el0_ia_bp_hardening(unsigned long addr,
 	if (addr > TASK_SIZE)
 		arm64_apply_bp_hardening();
 
-	local_irq_enable();
+	local_daif_restore(DAIF_PROCCTX);
 	do_mem_abort(addr, esr, regs);
 }
 
@@ -785,7 +791,7 @@ asmlinkage void __exception do_sp_pc_abort(unsigned long addr,
 	if (user_mode(regs)) {
 		if (instruction_pointer(regs) > TASK_SIZE)
 			arm64_apply_bp_hardening();
-		local_irq_enable();
+		local_daif_restore(DAIF_PROCCTX);
 	}
 
 	clear_siginfo(&info);
@@ -831,7 +837,7 @@ asmlinkage int __exception do_debug_exception(unsigned long addr,
 					      unsigned int esr,
 					      struct pt_regs *regs)
 {
-	const struct fault_info *inf = debug_fault_info + DBG_ESR_EVT(esr);
+	const struct fault_info *inf = esr_to_debug_fault_info(esr);
 	int rv;
 
 	/*
@@ -864,17 +870,3 @@ asmlinkage int __exception do_debug_exception(unsigned long addr,
 	return rv;
 }
 NOKPROBE_SYMBOL(do_debug_exception);
-
-#ifdef CONFIG_ARM64_PAN
-void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused)
-{
-	/*
-	 * We modify PSTATE. This won't work from irq context as the PSTATE
-	 * is discarded once we return from the exception.
-	 */
-	WARN_ON_ONCE(in_interrupt());
-
-	sysreg_clear_set(sctlr_el1, SCTLR_EL1_SPAN, 0);
-	asm(SET_PSTATE_PAN(1));
-}
-#endif /* CONFIG_ARM64_PAN */