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arm64: Handle mismatched cache type

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commit 314d53d297980676011e6fd83dac60db4a01dc70 upstream.

Track mismatches in the cache type register (CTR_EL0), other
than the D/I min line sizes and trap user accesses if there are any.

Fixes: be68a8aaf925 ("arm64: cpufeature: Fix CTR_EL0 field definitions")
Cc: <stable@vger.kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2018-07-04 23:07:46 +01:00 committed by Greg Kroah-Hartman
parent a683009568
commit 67badb2521
2 changed files with 16 additions and 4 deletions
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3
arch/arm64/include/asm/cpucaps.h
View File

@ -37,7 +37,8 @@
#define ARM64_UNMAP_KERNEL_AT_EL0 16
#define ARM64_HARDEN_BRANCH_PREDICTOR 17
#define ARM64_SSBD 18
#define ARM64_MISMATCHED_CACHE_TYPE 19
#define ARM64_NCAPS 19
#define ARM64_NCAPS 20
#endif /* __ASM_CPUCAPS_H */

17
arch/arm64/kernel/cpu_errata.c
View File

@ -32,11 +32,15 @@ is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope)
}
static bool
has_mismatched_cache_line_size(const struct arm64_cpu_capabilities *entry,
int scope)
has_mismatched_cache_type(const struct arm64_cpu_capabilities *entry,
int scope)
{
u64 mask = CTR_CACHE_MINLINE_MASK;
/* Skip matching the min line sizes for cache type check */
if (entry->capability == ARM64_MISMATCHED_CACHE_TYPE)
mask ^= arm64_ftr_reg_ctrel0.strict_mask;
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
return (read_cpuid_cachetype() & mask) !=
(arm64_ftr_reg_ctrel0.sys_val & mask);
@ -449,7 +453,14 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
{
.desc = "Mismatched cache line size",
.capability = ARM64_MISMATCHED_CACHE_LINE_SIZE,
.matches = has_mismatched_cache_line_size,
.matches = has_mismatched_cache_type,
.def_scope = SCOPE_LOCAL_CPU,
.enable = cpu_enable_trap_ctr_access,
},
{
.desc = "Mismatched cache type",
.capability = ARM64_MISMATCHED_CACHE_TYPE,
.matches = has_mismatched_cache_type,
.def_scope = SCOPE_LOCAL_CPU,
.enable = cpu_enable_trap_ctr_access,
},