diff options
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/armv8_deprecated.c | 8 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 20 |
2 files changed, 27 insertions, 1 deletions
diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c index 78d56bff91fd..bcee7abac68e 100644 --- a/arch/arm64/kernel/armv8_deprecated.c +++ b/arch/arm64/kernel/armv8_deprecated.c @@ -14,6 +14,8 @@ #include <linux/slab.h> #include <linux/sysctl.h> +#include <asm/alternative.h> +#include <asm/cpufeature.h> #include <asm/insn.h> #include <asm/opcodes.h> #include <asm/sysreg.h> @@ -280,6 +282,8 @@ static void register_insn_emulation_sysctl(struct ctl_table *table) */ #define __user_swpX_asm(data, addr, res, temp, B) \ __asm__ __volatile__( \ + ALTERNATIVE("nop", SET_PSTATE_PAN(0), ARM64_HAS_PAN, \ + CONFIG_ARM64_PAN) \ " mov %w2, %w1\n" \ "0: ldxr"B" %w1, [%3]\n" \ "1: stxr"B" %w0, %w2, [%3]\n" \ @@ -295,7 +299,9 @@ static void register_insn_emulation_sysctl(struct ctl_table *table) " .align 3\n" \ " .quad 0b, 3b\n" \ " .quad 1b, 3b\n" \ - " .popsection" \ + " .popsection\n" \ + ALTERNATIVE("nop", SET_PSTATE_PAN(1), ARM64_HAS_PAN, \ + CONFIG_ARM64_PAN) \ : "=&r" (res), "+r" (data), "=&r" (temp) \ : "r" (addr), "i" (-EAGAIN), "i" (-EFAULT) \ : "memory") diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 74fd0f74b065..978fa169d3c3 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -21,6 +21,7 @@ #include <linux/types.h> #include <asm/cpu.h> #include <asm/cpufeature.h> +#include <asm/processor.h> static bool feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry) @@ -39,6 +40,15 @@ has_id_aa64pfr0_feature(const struct arm64_cpu_capabilities *entry) return feature_matches(val, entry); } +static bool __maybe_unused +has_id_aa64mmfr1_feature(const struct arm64_cpu_capabilities *entry) +{ + u64 val; + + val = read_cpuid(id_aa64mmfr1_el1); + return feature_matches(val, entry); +} + static const struct arm64_cpu_capabilities arm64_features[] = { { .desc = "GIC system register CPU interface", @@ -47,6 +57,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .field_pos = 24, .min_field_value = 1, }, +#ifdef CONFIG_ARM64_PAN + { + .desc = "Privileged Access Never", + .capability = ARM64_HAS_PAN, + .matches = has_id_aa64mmfr1_feature, + .field_pos = 20, + .min_field_value = 1, + .enable = cpu_enable_pan, + }, +#endif /* CONFIG_ARM64_PAN */ {}, }; |
