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From: Ricardo Koller <ricarkol@google.com>
To: pbonzini@redhat.com, maz@kernel.org, oupton@google.com,
	 dmatlack@google.com, qperret@google.com,
	catalin.marinas@arm.com,  andrew.jones@linux.dev,
	seanjc@google.com, alexandru.elisei@arm.com,
	 suzuki.poulose@arm.com, eric.auger@redhat.com, gshan@redhat.com,
	 reijiw@google.com, rananta@google.com, bgardon@google.com
Cc: kvmarm@lists.linux.dev, ricarkol@gmail.com,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Subject: [RFC PATCH 05/12] arm64: Add a capability for FEAT_BBM level 2
Date: Sat, 12 Nov 2022 08:17:07 +0000	[thread overview]
Message-ID: <20221112081714.2169495-6-ricarkol@google.com> (raw)
In-Reply-To: <20221112081714.2169495-1-ricarkol@google.com>

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

Signed-off-by: Ricardo Koller <ricarkol@google.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 6062454a9067..ff97fb05d430 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2339,6 +2339,17 @@ 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 f1c0347ec31a..f421adbdb08b 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -36,6 +36,7 @@ HAS_PAN
 HAS_RAS_EXTN
 HAS_RNG
 HAS_SB
+HAS_STAGE2_BBM2
 HAS_STAGE2_FWB
 HAS_SYSREG_GIC_CPUIF
 HAS_TIDCP1
-- 
2.38.1.431.g37b22c650d-goog

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WARNING: multiple messages have this Message-ID (diff)
From: Ricardo Koller <ricarkol@google.com>
To: pbonzini@redhat.com, maz@kernel.org, oupton@google.com,
	 dmatlack@google.com, qperret@google.com,
	catalin.marinas@arm.com,  andrew.jones@linux.dev,
	seanjc@google.com, alexandru.elisei@arm.com,
	 suzuki.poulose@arm.com, eric.auger@redhat.com, gshan@redhat.com,
	 reijiw@google.com, rananta@google.com, bgardon@google.com
Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev,
	kvmarm@lists.cs.columbia.edu,  ricarkol@gmail.com,
	Ricardo Koller <ricarkol@google.com>
Subject: [RFC PATCH 05/12] arm64: Add a capability for FEAT_BBM level 2
Date: Sat, 12 Nov 2022 08:17:07 +0000	[thread overview]
Message-ID: <20221112081714.2169495-6-ricarkol@google.com> (raw)
Message-ID: <20221112081707.awUE0uU3bcUvaTdCER4LpNQiyrHRNAS1aGt04sTdco4@z> (raw)
In-Reply-To: <20221112081714.2169495-1-ricarkol@google.com>

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

Signed-off-by: Ricardo Koller <ricarkol@google.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 6062454a9067..ff97fb05d430 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2339,6 +2339,17 @@ 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 f1c0347ec31a..f421adbdb08b 100644
--- a/arch/arm64/tools/cpucaps
+++ b/arch/arm64/tools/cpucaps
@@ -36,6 +36,7 @@ HAS_PAN
 HAS_RAS_EXTN
 HAS_RNG
 HAS_SB
+HAS_STAGE2_BBM2
 HAS_STAGE2_FWB
 HAS_SYSREG_GIC_CPUIF
 HAS_TIDCP1
-- 
2.38.1.431.g37b22c650d-goog


  parent reply	other threads:[~2022-11-12  8:17 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-12  8:17 [RFC PATCH 00/12] KVM: arm64: Eager huge-page splitting for dirty-logging Ricardo Koller
2022-11-12  8:17 ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 01/12] KVM: arm64: Relax WARN check in stage2_make_pte() Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-14 20:59   ` Oliver Upton
2022-11-14 20:59     ` Oliver Upton
2022-11-12  8:17 ` [RFC PATCH 02/12] KVM: arm64: Allow visiting block PTEs in post-order Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-14 18:48   ` Oliver Upton
2022-11-14 18:48     ` Oliver Upton
2023-01-13  3:44     ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 03/12] KVM: arm64: Add stage2_create_removed() Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 04/12] KVM: arm64: Add kvm_pgtable_stage2_split() Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-14 20:54   ` Oliver Upton
2022-11-14 20:54     ` Oliver Upton
2022-11-15 23:03     ` Ricardo Koller
2022-11-15 23:03       ` Ricardo Koller
2022-11-15 23:27       ` Ricardo Koller
2022-11-15 23:27         ` Ricardo Koller
2022-11-15 23:54         ` Oliver Upton
2022-11-15 23:54           ` Oliver Upton
2022-11-17 21:50           ` Ricardo Koller
2022-11-17 21:50             ` Ricardo Koller
2022-11-12  8:17 ` Ricardo Koller [this message]
2022-11-12  8:17   ` [RFC PATCH 05/12] arm64: Add a capability for FEAT_BBM level 2 Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 06/12] KVM: arm64: Split block PTEs without using break-before-make Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-14 18:56   ` Oliver Upton
2022-11-14 18:56     ` Oliver Upton
2022-11-12  8:17 ` [RFC PATCH 07/12] KVM: arm64: Refactor kvm_arch_commit_memory_region() Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 08/12] KVM: arm64: Add kvm_uninit_stage2_mmu() Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 09/12] KVM: arm64: Split huge pages when dirty logging is enabled Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 10/12] KVM: arm64: Open-code kvm_mmu_write_protect_pt_masked() Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 11/12] KVM: arm64: Split huge pages during KVM_CLEAR_DIRTY_LOG Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-12  8:17 ` [RFC PATCH 12/12] KVM: arm64: Use local TLBI on permission relaxation Ricardo Koller
2022-11-12  8:17   ` Ricardo Koller
2022-11-14 18:42 ` [RFC PATCH 00/12] KVM: arm64: Eager huge-page splitting for dirty-logging Oliver Upton
2022-11-14 18:42   ` Oliver Upton
2023-01-13  3:42   ` Ricardo Koller

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