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| author | Marc Zyngier <marc.zyngier@arm.com> | 2015-01-29 11:24:05 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 18:34:16 +0000 |
| commit | d88701bea3664cea99b8b7380f63a3bd0ec3ead3 (patch) | |
| tree | 2a91794924445300fd79b316494b35a35de2aeaf | |
| parent | f81f03fa231a8c3aacd580759e73b9238b92ba29 (diff) | |
| download | linux-d88701bea3664cea99b8b7380f63a3bd0ec3ead3.tar.bz2 | |
arm64: Add ARM64_HAS_VIRT_HOST_EXTN feature
Add a new ARM64_HAS_VIRT_HOST_EXTN features to indicate that the
CPU has the ARMv8.1 VHE capability.
This will be used to trigger kernel patching in KVM.
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
| -rw-r--r-- | arch/arm64/include/asm/cpufeature.h | 6 | ||||
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 11 |
2 files changed, 16 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 8f271b83f910..a5c769b1c65b 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -30,8 +30,12 @@ #define ARM64_HAS_LSE_ATOMICS 5 #define ARM64_WORKAROUND_CAVIUM_23154 6 #define ARM64_WORKAROUND_834220 7 +/* #define ARM64_HAS_NO_HW_PREFETCH 8 */ +/* #define ARM64_HAS_UAO 9 */ +/* #define ARM64_ALT_PAN_NOT_UAO 10 */ +#define ARM64_HAS_VIRT_HOST_EXTN 11 -#define ARM64_NCAPS 8 +#define ARM64_NCAPS 12 #ifndef __ASSEMBLY__ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 5c90aa490a2b..ba745199297e 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -26,6 +26,7 @@ #include <asm/cpu_ops.h> #include <asm/processor.h> #include <asm/sysreg.h> +#include <asm/virt.h> unsigned long elf_hwcap __read_mostly; EXPORT_SYMBOL_GPL(elf_hwcap); @@ -621,6 +622,11 @@ static bool has_useable_gicv3_cpuif(const struct arm64_cpu_capabilities *entry) return has_sre; } +static bool runs_at_el2(const struct arm64_cpu_capabilities *entry) +{ + return is_kernel_in_hyp_mode(); +} + static const struct arm64_cpu_capabilities arm64_features[] = { { .desc = "GIC system register CPU interface", @@ -651,6 +657,11 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .min_field_value = 2, }, #endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */ + { + .desc = "Virtualization Host Extensions", + .capability = ARM64_HAS_VIRT_HOST_EXTN, + .matches = runs_at_el2, + }, {}, }; |