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| author |  Catalin Marinas <catalin.marinas@arm.com>
| 2021-05-26 20:36:21 +0100 |
|---|---|---|
| committer |  Will Deacon <will@kernel.org>
| 2021-05-26 22:05:07 +0100 |
| commit | 21047e91a5a674b97ebbf2c2c1751f1e9c317f09 (patch) | |
| tree | 21524e7af7b2d9514d5ae9e27c67af0db8c193c2 /arch/arm64/include/asm/cpu.h | |
| parent | arm64: Change the cpuinfo_arm64 member type for some sysregs to u64 (diff) | |
| download | linux-21047e91a5a674b97ebbf2c2c1751f1e9c317f09.tar.gz linux-21047e91a5a674b97ebbf2c2c1751f1e9c317f09.tar.bz2 linux-21047e91a5a674b97ebbf2c2c1751f1e9c317f09.zip | |
arm64: Check if GMID_EL1.BS is the same on all CPUs
The GMID_EL1.BS field determines the number of tags accessed by the
LDGM/STGM instructions (EL1 and up), used by the kernel for copying or
zeroing page tags.
Taint the kernel if GMID_EL1.BS differs between CPUs but only of
CONFIG_ARM64_MTE is enabled.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Link: https://lore.kernel.org/r/20210526193621.21559-3-catalin.marinas@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/cpu.h')
| -rw-r--r-- | arch/arm64/include/asm/cpu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h index fe5a8499ddc2..9088e72c7cf6 100644 --- a/arch/arm64/include/asm/cpu.h +++ b/arch/arm64/include/asm/cpu.h @@ -20,6 +20,7 @@ struct cpuinfo_arm64 { u64 reg_dczid; u64 reg_midr; u64 reg_revidr; + u64 reg_gmid; u64 reg_id_aa64dfr0; u64 reg_id_aa64dfr1; |