linux-kernel - [PATCH 1/3] arm64: Add a capability for FEAT

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Date:   Fri,  2 Jun 2023 17:01:45 +0000
From:   Colton Lewis <coltonlewis@...gle.com>
To:     kvm@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.linux.dev, Ricardo Koller <ricarkol@...gle.com>
Subject: [PATCH 1/3] arm64: Add a capability for FEAT_BBM level 2

From: Ricardo Koller <ricarkol@...gle.com>

Add a new capability to detect "Stage-2 Translation table
break-before-make" (FEAT_BBM) level 2.

Signed-off-by: Ricardo Koller <ricarkol@...gle.com>
---
 arch/arm64/kernel/cpufeature.c | 11 +++++++++++
 arch/arm64/tools/cpucaps       |  1 +
 2 files changed, 12 insertions(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index c331c49a7d19c..c538060f7f66b 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2455,6 +2455,17 @@ static const struct arm64_cpu_capabilities arm64_features[] = {
 		.min_field_value = 1,
 		.matches = has_cpuid_feature,
 	},
+	{
+		.desc = "Stage-2 Translation table break-before-make level 2",
+		.type = ARM64_CPUCAP_SYSTEM_FEATURE,
+		.capability = ARM64_HAS_STAGE2_BBM2,
+		.sys_reg = SYS_ID_AA64MMFR2_EL1,
+		.sign = FTR_UNSIGNED,
+		.field_pos = ID_AA64MMFR2_EL1_BBM_SHIFT,
+		.field_width = 4,
+		.min_field_value = 2,
+		.matches = has_cpuid_feature,
+	},
 	{
 		.desc = "TLB range maintenance instructions",
 		.capability = ARM64_HAS_TLB_RANGE,
diff --git a/arch/arm64/tools/cpucaps b/arch/arm64/tools/cpucaps
index 40ba95472594d..010aca1892642 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -41,6 +41,7 @@ HAS_PAN
 HAS_RAS_EXTN
 HAS_RNG
 HAS_SB
+HAS_STAGE2_BBM2
 HAS_STAGE2_FWB
 HAS_TIDCP1
 HAS_TLB_RANGE
--
2.41.0.rc0.172.g3f132b7071-goog