linux-kernel - [PATCH v2 3/3] arm64: cpufeature: Change 32-bit EL0 to display enabled cores

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Date:   Tue, 17 Oct 2023 00:23:22 -0500
From:   Jeremy Linton <jeremy.linton@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, will@...nel.org, mark.rutland@....com,
        maz@...nel.org, anshuman.khandual@....com, krisman@...e.de,
        broonie@...nel.org, james.morse@....com, ionela.voinescu@....com,
        linux-kernel@...r.kernel.org, Jeremy Linton <jeremy.linton@....com>
Subject: [PATCH v2 3/3] arm64: cpufeature: Change 32-bit EL0 to display enabled cores

Now that we have the ability to display the list of cores
with a feature when it is selectivly enabled, lets display the
cores enabled for 32-bit use at EL0.

Signed-off-by: Jeremy Linton <jeremy.linton@....com>
---
 arch/arm64/kernel/cpufeature.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index b7b67bac0e60..512cbe446b41 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1533,8 +1533,17 @@ static bool has_32bit_el0(const struct arm64_cpu_capabilities *entry, int scope)
 	if (!has_cpuid_feature(entry, scope))
 		return allow_mismatched_32bit_el0;
 
-	if (scope == SCOPE_SYSTEM)
-		pr_info("detected: 32-bit EL0 Support\n");
+	if (scope == SCOPE_SYSTEM) {
+		struct arm64_cpu_capabilities *has_32bit;
+
+		has_32bit = (struct arm64_cpu_capabilities *)entry;
+
+		has_32bit->cpus = system_32bit_el0_cpumask();
+		if (has_32bit->cpus == cpu_possible_mask)
+			has_32bit->cpus = cpu_online_mask;
+		if (has_32bit->cpus == cpu_none_mask)
+			has_32bit->cpus = NULL;
+	}
 
 	return true;
 }
@@ -2307,9 +2316,11 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 		ARM64_CPUID_FIELDS(ID_AA64MMFR2_EL1, NV, IMP)
 	},
 	{
+		.desc = "32-bit EL0 Support",
 		.capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE,
 		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
 		.matches = has_32bit_el0,
+		.cpus = cpu_none_mask,
 		ARM64_CPUID_FIELDS(ID_AA64PFR0_EL1, EL0, AARCH32)
 	},
 #ifdef CONFIG_KVM
-- 
2.41.0