[RFC PATCH 05/28] arm64: RME: Define the user ABI

Steven Price
2023-01-27T11:32:30Z

There is one (multiplexed) CAP which can be used to create, populate and
then activate the realm.

Signed-off-by: Steven Price <steven.price@arm.com>
---
Documentation/virt/kvm/api.rst | 1 +
arch/arm64/include/uapi/asm/kvm.h | 63 +++++++++++++++++++++++++++++++
include/uapi/linux/kvm.h | 2 +
3 files changed, 66 insertions(+)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 0dd5d8733dd5..f1a59d6fb7fc 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -4965,6 +4965,7 @@ 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 a7a857f1784d..fcc0b8dce29b 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -109,6 +109,7 @@ struct kvm_regs {
#define KVM_ARM_VCPU_SVE 4 /* enable SVE for this CPU */
#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_REC 7 /* VCPU REC state as part of Realm */

struct kvm_vcpu_init {
__u32 target;
@@ -401,6 +402,68 @@ 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
+#define KVM_CAP_ARM_RME_CFG_SVE 2
+#define KVM_CAP_ARM_RME_CFG_DBG 3
+#define KVM_CAP_ARM_RME_CFG_PMU 4
+
+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;
+ };
+
+ /* cfg == KVM_CAP_ARM_RME_CFG_SVE */
+ struct {
+ __u32 sve_vq;
+ };
+
+ /* cfg == KVM_CAP_ARM_RME_CFG_DBG */
+ struct {
+ __u32 num_brps;
+ __u32 num_wrps;
+ };
+
+ /* cfg == KVM_CAP_ARM_RME_CFG_PMU */
+ struct {
+ __u32 num_pmu_cntrs;
+ };
+ /* Fix the size of the union */
+ __u8 reserved[256];
+ };
+};
+
+struct kvm_cap_arm_rme_populate_realm_args {
+ __u64 populate_ipa_base;
+ __u64 populate_ipa_size;
+};
+
+struct kvm_cap_arm_rme_init_ipa_args {
+ __u64 init_ipa_base;
+ __u64 init_ipa_size;
+};
+
/* 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 20522d4ba1e0..fec1909e8b73 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1176,6 +1176,8 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 224
#define KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP 225

+#define KVM_CAP_ARM_RME 300 // FIXME: Large number to prevent conflicts
+
#ifdef KVM_CAP_IRQ_ROUTING

struct kvm_irq_routing_irqchip {
--
2.34.1