linux-kernel - [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm platform device

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Message-ID: <20250728135216.48084-12-aneesh.kumar@kernel.org>
Date: Mon, 28 Jul 2025 19:21:48 +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,
	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>,
	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: [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm platform device

Register a platform device if the CCA DA feature is supported.
A driver for this platform device will further drive the CCA DA workflow.

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
---
 arch/arm64/include/asm/rmi_smc.h |  3 +++
 arch/arm64/kvm/rme.c             | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/arm64/include/asm/rmi_smc.h b/arch/arm64/include/asm/rmi_smc.h
index 504009a42035..42708d500048 100644
--- a/arch/arm64/include/asm/rmi_smc.h
+++ b/arch/arm64/include/asm/rmi_smc.h
@@ -12,6 +12,8 @@
 
 #include <linux/arm-smccc.h>
 
+#define RMI_DEV_NAME "arm-rmi-dev"
+
 #define SMC_RMI_CALL(func)				\
 	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL,		\
 			   ARM_SMCCC_SMC_64,		\
@@ -87,6 +89,7 @@ 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/rme.c b/arch/arm64/kvm/rme.c
index ec8093ec2da3..d1c147aba2ed 100644
--- a/arch/arm64/kvm/rme.c
+++ b/arch/arm64/kvm/rme.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/kvm_host.h>
+#include <linux/platform_device.h>
 
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_mmu.h>
@@ -1724,6 +1725,18 @@ int kvm_init_realm_vm(struct kvm *kvm)
 	return 0;
 }
 
+static struct platform_device cca_host_dev = {
+	.name = RMI_DEV_NAME,
+	.id = PLATFORM_DEVID_NONE
+};
+
+static void rmm_tsm_init(void)
+{
+	if (!platform_device_register(&cca_host_dev))
+		pr_info("CCA host DA platform device initialized.\n");
+
+}
+
 void kvm_init_rme(void)
 {
 	if (PAGE_SIZE != SZ_4K)
@@ -1737,6 +1750,9 @@ void kvm_init_rme(void)
 	if (WARN_ON(rmi_features(0, &rmm_feat_reg0)))
 		return;
 
+	if (rme_has_feature(RMI_FEATURE_REGISTER_0_DA))
+		rmm_tsm_init();
+
 	if (rme_vmid_init())
 		return;
 
-- 
2.43.0