| Message ID | 20231124163510.1835740-4-joey.gouly@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Permission Overlay Extension | expand |
On Fri, Nov 24, 2023 at 04:34:48PM +0000, Joey Gouly wrote: > This indicates if the system supports POE. This is a CPUCAP_BOOT_CPU_FEATURE > as the boot CPU will enable POE if it has it, so secondary CPUs must also > have this feature. > > Add a new config option: ARM64_POE For bisection purposes if nothing else I'd expect to see the Kconfig option added after everything else is in place so that we don't build a kernel image which has partial POE support available and confuse things, with no way to enable the config option earlier patches which just build the !POE case until everything is ready.
On Fri, Nov 24, 2023 at 04:34:48PM +0000, Joey Gouly wrote: > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2078,6 +2078,22 @@ config ARM64_EPAN > if the cpu does not implement the feature. > endmenu # "ARMv8.7 architectural features" > > +menu "ARMv8.9 architectural features" > +config ARM64_POE > + prompt "Permission Overlay Extension" > + def_bool y > + help > + The Permission Overlay Extension is used to implement Memory > + Protection Keys. Memory Protection Keys provides a mechanism for > + enforcing page-based protections, but without requiring modification > + of the page tables when an application changes protection domains. > + > + For details, see Documentation/core-api/protection-keys.rst > + > + If unsure, say y. > + > +endmenu # "ARMv8.9 architectural features" I agree with Mark, we typically leave the Kconfig option towards the end of the series. > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index 646591c67e7a..00b6d516ed3f 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -2731,6 +2731,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = { > .matches = has_cpuid_feature, > ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, EVT, IMP) > }, > +#ifdef CONFIG_ARM64_POE > + { > + .desc = "Stage-1 Permission Overlay Extension (S1POE)", > + .capability = ARM64_HAS_S1POE, > + .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, > + .matches = has_cpuid_feature, > + ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1POE, IMP) > + }, > +#endif Keeping the #ifdef here is ok, it won't be defined at this point.
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7b071a00425d..d7df6c603190 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2078,6 +2078,22 @@ config ARM64_EPAN if the cpu does not implement the feature. endmenu # "ARMv8.7 architectural features" +menu "ARMv8.9 architectural features" +config ARM64_POE + prompt "Permission Overlay Extension" + def_bool y + help + The Permission Overlay Extension is used to implement Memory + Protection Keys. Memory Protection Keys provides a mechanism for + enforcing page-based protections, but without requiring modification + of the page tables when an application changes protection domains. + + For details, see Documentation/core-api/protection-keys.rst + + If unsure, say y. + +endmenu # "ARMv8.9 architectural features" + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 646591c67e7a..00b6d516ed3f 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2731,6 +2731,15 @@ static const struct arm64_cpu_capabilities arm64_features[] = { .matches = has_cpuid_feature, ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, EVT, IMP) }, +#ifdef CONFIG_ARM64_POE + { + .desc = "Stage-1 Permission Overlay Extension (S1POE)", + .capability = ARM64_HAS_S1POE, + .type = ARM64_CPUCAP_BOOT_CPU_FEATURE, + .matches = has_cpuid_feature, + ARM64_CPUID_FIELDS(ID_AA64MMFR3_EL1, S1POE, IMP) + }, +#endif {}, }; diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps index b98c38288a9d..bbd2fac9345a 100644 --- a/arch/arm64/tools/cpucaps +++ b/arch/arm64/tools/cpucaps @@ -43,6 +43,7 @@ HAS_NESTED_VIRT HAS_NO_HW_PREFETCH HAS_PAN HAS_S1PIE +HAS_S1POE HAS_RAS_EXTN HAS_RNG HAS_SB
This indicates if the system supports POE. This is a CPUCAP_BOOT_CPU_FEATURE as the boot CPU will enable POE if it has it, so secondary CPUs must also have this feature. Add a new config option: ARM64_POE Signed-off-by: Joey Gouly <joey.gouly@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> --- arch/arm64/Kconfig | 16 ++++++++++++++++ arch/arm64/kernel/cpufeature.c | 9 +++++++++ arch/arm64/tools/cpucaps | 1 + 3 files changed, 26 insertions(+)