From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Implement a system-scoped ioctl to get system-wide parameters for TDX.
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
arch/x86/include/asm/kvm-x86-ops.h | 1 +
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/include/uapi/asm/kvm.h | 48 +++++++++++++++++++++++++++
arch/x86/kvm/vmx/main.c | 2 ++
arch/x86/kvm/vmx/tdx.c | 46 +++++++++++++++++++++++++
arch/x86/kvm/vmx/x86_ops.h | 2 ++
arch/x86/kvm/x86.c | 6 ++++
tools/arch/x86/include/uapi/asm/kvm.h | 48 +++++++++++++++++++++++++++
8 files changed, 154 insertions(+)
diff --git a/arch/x86/include/asm/kvm-x86-ops.h b/arch/x86/include/asm/kvm-x86-ops.h
index fbb2c6746066..3677a5015a4f 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -117,6 +117,7 @@ KVM_X86_OP(smi_allowed)
KVM_X86_OP(enter_smm)
KVM_X86_OP(leave_smm)
KVM_X86_OP(enable_smi_window)
+KVM_X86_OP_OPTIONAL(dev_mem_enc_ioctl)
KVM_X86_OP_OPTIONAL(mem_enc_ioctl)
KVM_X86_OP_OPTIONAL(mem_enc_register_region)
KVM_X86_OP_OPTIONAL(mem_enc_unregister_region)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 80df346af117..342decc69649 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1591,6 +1591,7 @@ struct kvm_x86_ops {
int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate);
void (*enable_smi_window)(struct kvm_vcpu *vcpu);
+ int (*dev_mem_enc_ioctl)(void __user *argp);
int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp);
int (*mem_enc_register_region)(struct kvm *kvm, struct kvm_enc_region *argp);
int (*mem_enc_unregister_region)(struct kvm *kvm, struct kvm_enc_region *argp);
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 9792ec1cc317..273c8d82b9c8 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -534,4 +534,52 @@ struct kvm_pmu_event_filter {
#define KVM_X86_DEFAULT_VM 0
#define KVM_X86_TDX_VM 1
+/* Trust Domain eXtension sub-ioctl() commands. */
+enum kvm_tdx_cmd_id {
+ KVM_TDX_CAPABILITIES = 0,
+
+ KVM_TDX_CMD_NR_MAX,
+};
+
+struct kvm_tdx_cmd {
+ /* enum kvm_tdx_cmd_id */
+ __u32 id;
+ /* flags for sub-commend. If sub-command doesn't use this, set zero. */
+ __u32 flags;
+ /*
+ * data for each sub-command. An immediate or a pointer to the actual
+ * data in process virtual address. If sub-command doesn't use it,
+ * set zero.
+ */
+ __u64 data;
+ /*
+ * Auxiliary error code. The sub-command may return TDX SEAMCALL
+ * status code in addition to -Exxx.
+ * Defined for consistency with struct kvm_sev_cmd.
+ */
+ __u64 error;
+ /* Reserved: Defined for consistency with struct kvm_sev_cmd. */
+ __u64 unused;
+};
+
+struct kvm_tdx_cpuid_config {
+ __u32 leaf;
+ __u32 sub_leaf;
+ __u32 eax;
+ __u32 ebx;
+ __u32 ecx;
+ __u32 edx;
+};
+
+struct kvm_tdx_capabilities {
+ __u64 attrs_fixed0;
+ __u64 attrs_fixed1;
+ __u64 xfam_fixed0;
+ __u64 xfam_fixed1;
+
+ __u32 nr_cpuid_configs;
+ __u32 padding;
+ struct kvm_tdx_cpuid_config cpuid_configs[0];
+};
+
#endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
index 6a93b19a8b06..7b497ed1f21c 100644
--- a/arch/x86/kvm/vmx/main.c
+++ b/arch/x86/kvm/vmx/main.c
@@ -212,6 +212,8 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
.complete_emulated_msr = kvm_complete_insn_gp,
.vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector,
+
+ .dev_mem_enc_ioctl = tdx_dev_ioctl,
};
struct kvm_x86_init_ops vt_init_ops __initdata = {
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 63f3c7a02cc8..ec4ebba4152a 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -392,6 +392,52 @@ int tdx_vm_init(struct kvm *kvm)
return ret;
}
+int tdx_dev_ioctl(void __user *argp)
+{
+ struct kvm_tdx_capabilities __user *user_caps;
+ struct kvm_tdx_capabilities caps;
+ struct kvm_tdx_cmd cmd;
+
+ BUILD_BUG_ON(sizeof(struct kvm_tdx_cpuid_config) !=
+ sizeof(struct tdx_cpuid_config));
+
+ if (copy_from_user(&cmd, argp, sizeof(cmd)))
+ return -EFAULT;
+ if (cmd.flags || cmd.error || cmd.unused)
+ return -EINVAL;
+ /*
+ * Currently only KVM_TDX_CAPABILITIES is defined for system-scoped
+ * mem_enc_ioctl().
+ */
+ if (cmd.id != KVM_TDX_CAPABILITIES)
+ return -EINVAL;
+
+ user_caps = (void __user *)cmd.data;
+ if (copy_from_user(&caps, user_caps, sizeof(caps)))
+ return -EFAULT;
+
+ if (caps.nr_cpuid_configs < tdx_caps.nr_cpuid_configs)
+ return -E2BIG;
+
+ caps = (struct kvm_tdx_capabilities) {
+ .attrs_fixed0 = tdx_caps.attrs_fixed0,
+ .attrs_fixed1 = tdx_caps.attrs_fixed1,
+ .xfam_fixed0 = tdx_caps.xfam_fixed0,
+ .xfam_fixed1 = tdx_caps.xfam_fixed1,
+ .nr_cpuid_configs = tdx_caps.nr_cpuid_configs,
+ .padding = 0,
+ };
+
+ if (copy_to_user(user_caps, &caps, sizeof(caps)))
+ return -EFAULT;
+ if (copy_to_user(user_caps->cpuid_configs, &tdx_caps.cpuid_configs,
+ tdx_caps.nr_cpuid_configs *
+ sizeof(struct tdx_cpuid_config)))
+ return -EFAULT;
+
+ return 0;
+}
+
int __init tdx_module_setup(void)
{
const struct tdsysinfo_struct *tdsysinfo;
diff --git a/arch/x86/kvm/vmx/x86_ops.h b/arch/x86/kvm/vmx/x86_ops.h
index 663fd8d4063f..3027d9821fe1 100644
--- a/arch/x86/kvm/vmx/x86_ops.h
+++ b/arch/x86/kvm/vmx/x86_ops.h
@@ -132,6 +132,7 @@ void vmx_setup_mce(struct kvm_vcpu *vcpu);
int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops);
bool tdx_is_vm_type_supported(unsigned long type);
void tdx_hardware_unsetup(void);
+int tdx_dev_ioctl(void __user *argp);
int tdx_vm_init(struct kvm *kvm);
void tdx_mmu_release_hkid(struct kvm *kvm);
@@ -140,6 +141,7 @@ void tdx_vm_free(struct kvm *kvm);
static inline int tdx_hardware_setup(struct kvm_x86_ops *x86_ops) { return 0; }
static inline bool tdx_is_vm_type_supported(unsigned long type) { return false; }
static inline void tdx_hardware_unsetup(void) {}
+static inline int tdx_dev_ioctl(void __user *argp) { return -EOPNOTSUPP; };
static inline int tdx_vm_init(struct kvm *kvm) { return -EOPNOTSUPP; }
static inline void tdx_mmu_release_hkid(struct kvm *kvm) {}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 320f902eaf9e..6037ce93bcb7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4565,6 +4565,12 @@ long kvm_arch_dev_ioctl(struct file *filp,
break;
r = kvm_x86_dev_has_attr(&attr);
break;
+ case KVM_MEMORY_ENCRYPT_OP:
+ r = -EINVAL;
+ if (!kvm_x86_ops.dev_mem_enc_ioctl)
+ goto out;
+ r = static_call(kvm_x86_dev_mem_enc_ioctl)(argp);
+ break;
}
default:
r = -EINVAL;
diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include/uapi/asm/kvm.h
index 71a5851475e7..a9ea3573be1b 100644
--- a/tools/arch/x86/include/uapi/asm/kvm.h
+++ b/tools/arch/x86/include/uapi/asm/kvm.h
@@ -528,4 +528,52 @@ struct kvm_pmu_event_filter {
#define KVM_X86_DEFAULT_VM 0
#define KVM_X86_TDX_VM 1
+/* Trust Domain eXtension sub-ioctl() commands. */
+enum kvm_tdx_cmd_id {
+ KVM_TDX_CAPABILITIES = 0,
+
+ KVM_TDX_CMD_NR_MAX,
+};
+
+struct kvm_tdx_cmd {
+ /* enum kvm_tdx_cmd_id */
+ __u32 id;
+ /* flags for sub-commend. If sub-command doesn't use this, set zero. */
+ __u32 flags;
+ /*
+ * data for each sub-command. An immediate or a pointer to the actual
+ * data in process virtual address. If sub-command doesn't use it,
+ * set zero.
+ */
+ __u64 data;
+ /*
+ * Auxiliary error code. The sub-command may return TDX SEAMCALL
+ * status code in addition to -Exxx.
+ * Defined for consistency with struct kvm_sev_cmd.
+ */
+ __u64 error;
+ /* Reserved: Defined for consistency with struct kvm_sev_cmd. */
+ __u64 unused;
+};
+
+struct kvm_tdx_cpuid_config {
+ __u32 leaf;
+ __u32 sub_leaf;
+ __u32 eax;
+ __u32 ebx;
+ __u32 ecx;
+ __u32 edx;
+};
+
+struct kvm_tdx_capabilities {
+ __u64 attrs_fixed0;
+ __u64 attrs_fixed1;
+ __u64 xfam_fixed0;
+ __u64 xfam_fixed1;
+
+ __u32 nr_cpuid_configs;
+ __u32 padding;
+ struct kvm_tdx_cpuid_config cpuid_configs[0];
+};
+
#endif /* _ASM_X86_KVM_H */
--
2.25.1
