linux-kernel - [PATCH 01/12] KVM: arm64: RMI: Export kvm_has_da

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Message-ID: <20251027094916.1153143-1-aneesh.kumar@kernel.org>
Date: Mon, 27 Oct 2025 15:18:52 +0530
From: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
To: linux-coco@...ts.linux.dev,
	kvmarm@...ts.linux.dev
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dan.j.williams@...el.com,
	aik@....com,
	lukas@...ner.de,
	Samuel Ortiz <sameo@...osinc.com>,
	Xu Yilun <yilun.xu@...ux.intel.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Suzuki K Poulose <Suzuki.Poulose@....com>,
	Steven Price <steven.price@....com>,
	Bjorn Helgaas <helgaas@...nel.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>,
	Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Subject: [PATCH 01/12] KVM: arm64: RMI: Export kvm_has_da_feature

This will be used in later patches

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
---
 arch/arm64/include/asm/kvm_rmi.h | 1 +
 arch/arm64/include/asm/rmi_smc.h | 1 +
 arch/arm64/kvm/rmi.c             | 6 ++++++
 3 files changed, 8 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_rmi.h b/arch/arm64/include/asm/kvm_rmi.h
index 1b2cdaac6c50..a967061af6ed 100644
--- a/arch/arm64/include/asm/kvm_rmi.h
+++ b/arch/arm64/include/asm/kvm_rmi.h
@@ -90,6 +90,7 @@ u32 kvm_realm_ipa_limit(void);
 u32 kvm_realm_vgic_nr_lr(void);
 u8 kvm_realm_max_pmu_counters(void);
 unsigned int kvm_realm_sve_max_vl(void);
+bool kvm_has_da_feature(void);
 
 u64 kvm_realm_reset_id_aa64dfr0_el1(const struct kvm_vcpu *vcpu, u64 val);
 
diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h
index 1000368f1bca..2ea657a87402 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -87,6 +87,7 @@ enum rmi_ripas {
 #define RMI_FEATURE_REGISTER_0_GICV3_NUM_LRS	GENMASK(37, 34)
 #define RMI_FEATURE_REGISTER_0_MAX_RECS_ORDER	GENMASK(41, 38)
 #define RMI_FEATURE_REGISTER_0_Reserved		GENMASK(63, 42)
+#define RMI_FEATURE_REGISTER_0_DA		BIT(42)
 
 #define RMI_REALM_PARAM_FLAG_LPA2		BIT(0)
 #define RMI_REALM_PARAM_FLAG_SVE		BIT(1)
diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c
index 478a73e0b35a..08f3d2362dfd 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c
@@ -1738,6 +1738,12 @@ int kvm_init_realm_vm(struct kvm *kvm)
 	return 0;
 }
 
+bool kvm_has_da_feature(void)
+{
+	return rmi_has_feature(RMI_FEATURE_REGISTER_0_DA);
+}
+EXPORT_SYMBOL_GPL(kvm_has_da_feature);
+
 void kvm_init_rmi(void)
 {
 	/* Only 4k page size on the host is supported */
-- 
2.43.0