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Message-Id: <20241004152804.72508-9-steven.price@arm.com>
Date: Fri, 4 Oct 2024 16:27:29 +0100
From: Steven Price <steven.price@....com>
To: kvm@...r.kernel.org,
kvmarm@...ts.linux.dev
Cc: Steven Price <steven.price@....com>,
Catalin Marinas <catalin.marinas@....com>,
Marc Zyngier <maz@...nel.org>,
Will Deacon <will@...nel.org>,
James Morse <james.morse@....com>,
Oliver Upton <oliver.upton@...ux.dev>,
Suzuki K Poulose <suzuki.poulose@....com>,
Zenghui Yu <yuzenghui@...wei.com>,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
Joey Gouly <joey.gouly@....com>,
Alexandru Elisei <alexandru.elisei@....com>,
Christoffer Dall <christoffer.dall@....com>,
Fuad Tabba <tabba@...gle.com>,
linux-coco@...ts.linux.dev,
Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
Gavin Shan <gshan@...hat.com>,
Shanker Donthineni <sdonthineni@...dia.com>,
Alper Gun <alpergun@...gle.com>,
"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>
Subject: [PATCH v5 08/43] arm64: RME: Define the user ABI
There is one (multiplexed) CAP which can be used to create, populate and
then activate the realm.
Co-developed-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Steven Price <steven.price@....com>
---
Documentation/virt/kvm/api.rst | 1 +
arch/arm64/include/uapi/asm/kvm.h | 49 +++++++++++++++++++++++++++++++
include/uapi/linux/kvm.h | 12 ++++++++
3 files changed, 62 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index e32471977d0a..f10dce8232f6 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -5088,6 +5088,7 @@ Recognised values for feature:
===== ===========================================
arm64 KVM_ARM_VCPU_SVE (requires KVM_CAP_ARM_SVE)
+ arm64 KVM_ARM_VCPU_REC (requires KVM_CAP_ARM_RME)
===== ===========================================
Finalizes the configuration of the specified vcpu feature.
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 964df31da975..080331008b79 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -108,6 +108,7 @@ struct kvm_regs {
#define KVM_ARM_VCPU_PTRAUTH_ADDRESS 5 /* VCPU uses address authentication */
#define KVM_ARM_VCPU_PTRAUTH_GENERIC 6 /* VCPU uses generic authentication */
#define KVM_ARM_VCPU_HAS_EL2 7 /* Support nested virtualization */
+#define KVM_ARM_VCPU_REC 8 /* VCPU REC state as part of Realm */
struct kvm_vcpu_init {
__u32 target;
@@ -418,6 +419,54 @@ enum {
#define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3
#define KVM_DEV_ARM_ITS_CTRL_RESET 4
+/* KVM_CAP_ARM_RME on VM fd */
+#define KVM_CAP_ARM_RME_CONFIG_REALM 0
+#define KVM_CAP_ARM_RME_CREATE_RD 1
+#define KVM_CAP_ARM_RME_INIT_IPA_REALM 2
+#define KVM_CAP_ARM_RME_POPULATE_REALM 3
+#define KVM_CAP_ARM_RME_ACTIVATE_REALM 4
+
+#define KVM_CAP_ARM_RME_MEASUREMENT_ALGO_SHA256 0
+#define KVM_CAP_ARM_RME_MEASUREMENT_ALGO_SHA512 1
+
+#define KVM_CAP_ARM_RME_RPV_SIZE 64
+
+/* List of configuration items accepted for KVM_CAP_ARM_RME_CONFIG_REALM */
+#define KVM_CAP_ARM_RME_CFG_RPV 0
+#define KVM_CAP_ARM_RME_CFG_HASH_ALGO 1
+
+struct kvm_cap_arm_rme_config_item {
+ __u32 cfg;
+ union {
+ /* cfg == KVM_CAP_ARM_RME_CFG_RPV */
+ struct {
+ __u8 rpv[KVM_CAP_ARM_RME_RPV_SIZE];
+ };
+
+ /* cfg == KVM_CAP_ARM_RME_CFG_HASH_ALGO */
+ struct {
+ __u32 hash_algo;
+ };
+
+ /* Fix the size of the union */
+ __u8 reserved[256];
+ };
+};
+
+#define KVM_ARM_RME_POPULATE_FLAGS_MEASURE BIT(0)
+struct kvm_cap_arm_rme_populate_realm_args {
+ __u64 populate_ipa_base;
+ __u64 populate_ipa_size;
+ __u32 flags;
+ __u32 reserved[3];
+};
+
+struct kvm_cap_arm_rme_init_ipa_args {
+ __u64 init_ipa_base;
+ __u64 init_ipa_size;
+ __u32 reserved[4];
+};
+
/* Device Control API on vcpu fd */
#define KVM_ARM_VCPU_PMU_V3_CTRL 0
#define KVM_ARM_VCPU_PMU_V3_IRQ 0
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 637efc055145..b3884757739d 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -934,6 +934,8 @@ struct kvm_enable_cap {
#define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237
#define KVM_CAP_X86_GUEST_MODE 238
+#define KVM_CAP_ARM_RME 300 /* FIXME: Large number to prevent conflicts */
+
struct kvm_irq_routing_irqchip {
__u32 irqchip;
__u32 pin;
@@ -1573,4 +1575,14 @@ struct kvm_pre_fault_memory {
__u64 padding[5];
};
+/* Available with KVM_CAP_ARM_RME, only for VMs with KVM_VM_TYPE_ARM_REALM */
+struct kvm_arm_rmm_psci_complete {
+ __u64 target_mpidr;
+ __u32 psci_status;
+ __u32 padding[3];
+};
+
+/* FIXME: Update nr (0xd2) when merging */
+#define KVM_ARM_VCPU_RMM_PSCI_COMPLETE _IOW(KVMIO, 0xd2, struct kvm_arm_rmm_psci_complete)
+
#endif /* __LINUX_KVM_H */
--
2.34.1
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