On Mon, Jan 25, 2016 at 03:53:37PM +0000, Marc Zyngier wrote:
> 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.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> arch/arm64/include/asm/cpufeature.h | 3 ++-
> arch/arm64/kernel/cpufeature.c | 15 +++++++++++++--
> 2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
> index 8f271b8..c705d6a 100644
> --- a/arch/arm64/include/asm/cpufeature.h
> +++ b/arch/arm64/include/asm/cpufeature.h
> @@ -30,8 +30,9 @@
> #define ARM64_HAS_LSE_ATOMICS 5
> #define ARM64_WORKAROUND_CAVIUM_23154 6
> #define ARM64_WORKAROUND_834220 7
> +#define ARM64_HAS_VIRT_HOST_EXTN 8
>
> -#define ARM64_NCAPS 8
> +#define ARM64_NCAPS 9
>
> #ifndef __ASSEMBLY__
>
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 5c90aa4..8d3961e 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -26,6 +26,9 @@
> #include <asm/cpu_ops.h>
> #include <asm/processor.h>
> #include <asm/sysreg.h>
> +#include <asm/virt.h>
> +
> +#include <linux/irqchip/arm-gic-v3.h>
>
> unsigned long elf_hwcap __read_mostly;
> EXPORT_SYMBOL_GPL(elf_hwcap);
> @@ -587,8 +590,6 @@ u64 read_system_reg(u32 id)
> return regp->sys_val;
> }
>
> -#include <linux/irqchip/arm-gic-v3.h>
> -
unrelated change?
> static bool
> feature_matches(u64 reg, const struct arm64_cpu_capabilities *entry)
> {
> @@ -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,
> + },
> {},
> };
>
> --
> 2.1.4
>
Otherwise:
Acked-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
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