diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index e28189c81691..9ac0246bd974 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -570,6 +570,7 @@ struct kvm_pmu_event_filter {
 /* Trust Domain eXtension sub-ioctl() commands. */
 enum kvm_tdx_cmd_id {
 	KVM_TDX_CAPABILITIES = 0,
+	KVM_TDX_INIT_VM,
 
 	KVM_TDX_CMD_NR_MAX,
 };
@@ -621,4 +622,30 @@ struct kvm_tdx_capabilities {
 	struct kvm_tdx_cpuid_config cpuid_configs[];
 };
 
+struct kvm_tdx_init_vm {
+	__u64 attributes;
+	__u64 mrconfigid[6];	/* sha384 digest */
+	__u64 mrowner[6];	/* sha384 digest */
+	__u64 mrownerconfig[6];	/* sha384 digest */
+	/*
+	 * For future extensibility to make sizeof(struct kvm_tdx_init_vm) = 8KB.
+	 * This should be enough given sizeof(TD_PARAMS) = 1024.
+	 * 8KB was chosen given because
+	 * sizeof(struct kvm_cpuid_entry2) * KVM_MAX_CPUID_ENTRIES(=256) = 8KB.
+	 */
+	__u64 reserved[1004];
+
+	/*
+	 * Call KVM_TDX_INIT_VM before vcpu creation, thus before
+	 * KVM_SET_CPUID2.
+	 * This configuration supersedes KVM_SET_CPUID2s for VCPUs because the
+	 * TDX module directly virtualizes those CPUIDs without VMM.  The user
+	 * space VMM, e.g. qemu, should make KVM_SET_CPUID2 consistent with
+	 * those values.  If it doesn't, KVM may have wrong idea of vCPUIDs of
+	 * the guest, and KVM may wrongly emulate CPUIDs or MSRs that the TDX
+	 * module doesn't virtualize.
+	 */
+	struct kvm_cpuid2 cpuid;
+};
+
 #endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index adba49afb5fe..8cdcd6f406aa 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1443,6 +1443,13 @@ int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
 	return r;
 }
 
+struct kvm_cpuid_entry2 *kvm_find_cpuid_entry2(
+	struct kvm_cpuid_entry2 *entries, int nent, u32 function, u64 index)
+{
+	return cpuid_entry2_find(entries, nent, function, index);
+}
+EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry2);
+
 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry_index(struct kvm_vcpu *vcpu,
 						    u32 function, u32 index)
 {
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index 856e3037e74f..215d1c68c6d1 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -13,6 +13,8 @@ void kvm_set_cpu_caps(void);
 
 void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
 void kvm_update_pv_runtime(struct kvm_vcpu *vcpu);
+struct kvm_cpuid_entry2 *kvm_find_cpuid_entry2(struct kvm_cpuid_entry2 *entries,
+					       int nent, u32 function, u64 index);
 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry_index(struct kvm_vcpu *vcpu,
 						    u32 function, u32 index);
 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 2da405190616..83b962b4bd42 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -8,7 +8,6 @@
 #include "mmu.h"
 #include "tdx_arch.h"
 #include "tdx.h"
-#include "tdx_ops.h"
 #include "x86.h"
 
 #undef pr_fmt
@@ -393,18 +392,21 @@ static int tdx_do_tdh_mng_key_config(void *param)
 	return 0;
 }
 
-static int __tdx_td_init(struct kvm *kvm);
-
 int tdx_vm_init(struct kvm *kvm)
 {
+	/*
+	 * This function initializes only KVM software construct.  It doesn't
+	 * initialize TDX stuff, e.g. TDCS, TDR, TDCX, HKID etc.
+	 * It is handled by KVM_TDX_INIT_VM, __tdx_td_init().
+	 */
+
 	/*
 	 * TDX has its own limit of the number of vcpus in addition to
 	 * KVM_MAX_VCPUS.
 	 */
 	kvm->max_vcpus = min(kvm->max_vcpus, TDX_MAX_VCPUS);
 
-	/* Place holder for TDX specific logic. */
-	return __tdx_td_init(kvm);
+	return 0;
 }
 
 static int tdx_get_capabilities(struct kvm_tdx_cmd *cmd)
@@ -459,9 +461,161 @@ static int tdx_get_capabilities(struct kvm_tdx_cmd *cmd)
 	return ret;
 }
 
-static int __tdx_td_init(struct kvm *kvm)
+static int setup_tdparams_eptp_controls(struct kvm_cpuid2 *cpuid,
+					struct td_params *td_params)
+{
+	const struct kvm_cpuid_entry2 *entry;
+	int max_pa = 36;
+
+	entry = kvm_find_cpuid_entry2(cpuid->entries, cpuid->nent, 0x80000008, 0);
+	if (entry)
+		max_pa = entry->eax & 0xff;
+
+	td_params->eptp_controls = VMX_EPTP_MT_WB;
+	/*
+	 * No CPU supports 4-level && max_pa > 48.
+	 * "5-level paging and 5-level EPT" section 4.1 4-level EPT
+	 * "4-level EPT is limited to translating 48-bit guest-physical
+	 *  addresses."
+	 * cpu_has_vmx_ept_5levels() check is just in case.
+	 */
+	if (!cpu_has_vmx_ept_5levels() && max_pa > 48)
+		return -EINVAL;
+	if (cpu_has_vmx_ept_5levels() && max_pa > 48) {
+		td_params->eptp_controls |= VMX_EPTP_PWL_5;
+		td_params->exec_controls |= TDX_EXEC_CONTROL_MAX_GPAW;
+	} else {
+		td_params->eptp_controls |= VMX_EPTP_PWL_4;
+	}
+
+	return 0;
+}
+
+static void setup_tdparams_cpuids(struct kvm_cpuid2 *cpuid,
+				  struct td_params *td_params)
+{
+	int i;
+
+	/*
+	 * td_params.cpuid_values: The number and the order of cpuid_value must
+	 * be same to the one of struct tdsysinfo.{num_cpuid_config, cpuid_configs}
+	 * It's assumed that td_params was zeroed.
+	 */
+	for (i = 0; i < tdx_info->num_cpuid_config; i++) {
+		const struct kvm_tdx_cpuid_config *c = &tdx_info->cpuid_configs[i];
+		/* KVM_TDX_CPUID_NO_SUBLEAF means index = 0. */
+		u32 index = c->sub_leaf == KVM_TDX_CPUID_NO_SUBLEAF ? 0 : c->sub_leaf;
+		const struct kvm_cpuid_entry2 *entry =
+			kvm_find_cpuid_entry2(cpuid->entries, cpuid->nent,
+					      c->leaf, index);
+		struct tdx_cpuid_value *value = &td_params->cpuid_values[i];
+
+		if (!entry)
+			continue;
+
+		/*
+		 * tdsysinfo.cpuid_configs[].{eax, ebx, ecx, edx}
+		 * bit 1 means it can be configured to zero or one.
+		 * bit 0 means it must be zero.
+		 * Mask out non-configurable bits.
+		 */
+		value->eax = entry->eax & c->eax;
+		value->ebx = entry->ebx & c->ebx;
+		value->ecx = entry->ecx & c->ecx;
+		value->edx = entry->edx & c->edx;
+	}
+}
+
+static int setup_tdparams_xfam(struct kvm_cpuid2 *cpuid, struct td_params *td_params)
+{
+	const struct kvm_cpuid_entry2 *entry;
+	u64 guest_supported_xcr0;
+	u64 guest_supported_xss;
+
+	/* Setup td_params.xfam */
+	entry = kvm_find_cpuid_entry2(cpuid->entries, cpuid->nent, 0xd, 0);
+	if (entry)
+		guest_supported_xcr0 = (entry->eax | ((u64)entry->edx << 32));
+	else
+		guest_supported_xcr0 = 0;
+	guest_supported_xcr0 &= kvm_caps.supported_xcr0;
+
+	entry = kvm_find_cpuid_entry2(cpuid->entries, cpuid->nent, 0xd, 1);
+	if (entry)
+		guest_supported_xss = (entry->ecx | ((u64)entry->edx << 32));
+	else
+		guest_supported_xss = 0;
+
+	/*
+	 * PT can be exposed to TD guest regardless of KVM's XSS and CET
+	 * support.
+	 */
+	guest_supported_xss &=
+		(kvm_caps.supported_xss | XFEATURE_MASK_PT | TDX_TD_XFAM_CET);
+
+	td_params->xfam = guest_supported_xcr0 | guest_supported_xss;
+	if (td_params->xfam & XFEATURE_MASK_LBR) {
+		/*
+		 * TODO: once KVM supports LBR(save/restore LBR related
+		 * registers around TDENTER), remove this guard.
+		 */
+#define MSG_LBR	"TD doesn't support LBR yet. KVM needs to save/restore IA32_LBR_DEPTH properly.\n"
+		pr_warn(MSG_LBR);
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int setup_tdparams(struct kvm *kvm, struct td_params *td_params,
+			struct kvm_tdx_init_vm *init_vm)
+{
+	struct kvm_cpuid2 *cpuid = &init_vm->cpuid;
+	int ret;
+
+	if (kvm->created_vcpus)
+		return -EBUSY;
+
+	if (init_vm->attributes & TDX_TD_ATTRIBUTE_PERFMON) {
+		/*
+		 * TODO: save/restore PMU related registers around TDENTER.
+		 * Once it's done, remove this guard.
+		 */
+#define MSG_PERFMON	"TD doesn't support perfmon yet. KVM needs to save/restore host perf registers properly.\n"
+		pr_warn(MSG_PERFMON);
+		return -EOPNOTSUPP;
+	}
+
+	td_params->max_vcpus = kvm->max_vcpus;
+	td_params->attributes = init_vm->attributes;
+	td_params->tsc_frequency = TDX_TSC_KHZ_TO_25MHZ(kvm->arch.default_tsc_khz);
+
+	ret = setup_tdparams_eptp_controls(cpuid, td_params);
+	if (ret)
+		return ret;
+	setup_tdparams_cpuids(cpuid, td_params);
+	ret = setup_tdparams_xfam(cpuid, td_params);
+	if (ret)
+		return ret;
+
+#define MEMCPY_SAME_SIZE(dst, src)				\
+	do {							\
+		BUILD_BUG_ON(sizeof(dst) != sizeof(src));	\
+		memcpy((dst), (src), sizeof(dst));		\
+	} while (0)
+
+	MEMCPY_SAME_SIZE(td_params->mrconfigid, init_vm->mrconfigid);
+	MEMCPY_SAME_SIZE(td_params->mrowner, init_vm->mrowner);
+	MEMCPY_SAME_SIZE(td_params->mrownerconfig, init_vm->mrownerconfig);
+
+	return 0;
+}
+
+static int __tdx_td_init(struct kvm *kvm, struct td_params *td_params,
+			 u64 *seamcall_err)
 {
 	struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
+	struct tdx_module_args out;
 	cpumask_var_t packages;
 	unsigned long *tdcs_pa = NULL;
 	unsigned long tdr_pa = 0;
@@ -469,6 +623,7 @@ static int __tdx_td_init(struct kvm *kvm)
 	int ret, i;
 	u64 err;
 
+	*seamcall_err = 0;
 	ret = tdx_guest_keyid_alloc();
 	if (ret < 0)
 		return ret;
@@ -583,10 +738,23 @@ static int __tdx_td_init(struct kvm *kvm)
 		}
 	}
 
-	/*
-	 * Note, TDH_MNG_INIT cannot be invoked here.  TDH_MNG_INIT requires a dedicated
-	 * ioctl() to define the configure CPUID values for the TD.
-	 */
+	err = tdh_mng_init(kvm_tdx->tdr_pa, __pa(td_params), &out);
+	if ((err & TDX_SEAMCALL_STATUS_MASK) == TDX_OPERAND_INVALID) {
+		/*
+		 * Because a user gives operands, don't warn.
+		 * Return a hint to the user because it's sometimes hard for the
+		 * user to figure out which operand is invalid.  SEAMCALL status
+		 * code includes which operand caused invalid operand error.
+		 */
+		*seamcall_err = err;
+		ret = -EINVAL;
+		goto teardown;
+	} else if (WARN_ON_ONCE(err)) {
+		pr_tdx_error(TDH_MNG_INIT, err, &out);
+		ret = -EIO;
+		goto teardown;
+	}
+
 	return 0;
 
 	/*
@@ -629,6 +797,76 @@ static int __tdx_td_init(struct kvm *kvm)
 	return ret;
 }
 
+static int tdx_td_init(struct kvm *kvm, struct kvm_tdx_cmd *cmd)
+{
+	struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
+	struct kvm_tdx_init_vm *init_vm = NULL;
+	struct td_params *td_params = NULL;
+	int ret;
+
+	BUILD_BUG_ON(sizeof(*init_vm) != 8 * 1024);
+	BUILD_BUG_ON(sizeof(struct td_params) != 1024);
+
+	if (is_hkid_assigned(kvm_tdx))
+		return -EINVAL;
+
+	if (cmd->flags)
+		return -EINVAL;
+
+	init_vm = kzalloc(sizeof(*init_vm) +
+			  sizeof(init_vm->cpuid.entries[0]) * KVM_MAX_CPUID_ENTRIES,
+			  GFP_KERNEL);
+	if (!init_vm)
+		return -ENOMEM;
+	if (copy_from_user(init_vm, (void __user *)cmd->data, sizeof(*init_vm))) {
+		ret = -EFAULT;
+		goto out;
+	}
+	if (init_vm->cpuid.nent > KVM_MAX_CPUID_ENTRIES) {
+		ret = -E2BIG;
+		goto out;
+	}
+	if (copy_from_user(init_vm->cpuid.entries,
+			   (void __user *)cmd->data + sizeof(*init_vm),
+			   flex_array_size(init_vm, cpuid.entries, init_vm->cpuid.nent))) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	if (memchr_inv(init_vm->reserved, 0, sizeof(init_vm->reserved))) {
+		ret = -EINVAL;
+		goto out;
+	}
+	if (init_vm->cpuid.padding) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	td_params = kzalloc(sizeof(struct td_params), GFP_KERNEL);
+	if (!td_params) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = setup_tdparams(kvm, td_params, init_vm);
+	if (ret)
+		goto out;
+
+	ret = __tdx_td_init(kvm, td_params, &cmd->error);
+	if (ret)
+		goto out;
+
+	kvm_tdx->tsc_offset = td_tdcs_exec_read64(kvm_tdx, TD_TDCS_EXEC_TSC_OFFSET);
+	kvm_tdx->attributes = td_params->attributes;
+	kvm_tdx->xfam = td_params->xfam;
+
+out:
+	/* kfree() accepts NULL. */
+	kfree(init_vm);
+	kfree(td_params);
+	return ret;
+}
+
 int tdx_vm_ioctl(struct kvm *kvm, void __user *argp)
 {
 	struct kvm_tdx_cmd tdx_cmd;
@@ -645,6 +883,9 @@ int tdx_vm_ioctl(struct kvm *kvm, void __user *argp)
 	case KVM_TDX_CAPABILITIES:
 		r = tdx_get_capabilities(&tdx_cmd);
 		break;
+	case KVM_TDX_INIT_VM:
+		r = tdx_td_init(kvm, &tdx_cmd);
+		break;
 	default:
 		r = -EINVAL;
 		goto out;
diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
index ae117f864cfb..184fe394da86 100644
--- a/arch/x86/kvm/vmx/tdx.h
+++ b/arch/x86/kvm/vmx/tdx.h
@@ -12,7 +12,11 @@ struct kvm_tdx {
 	unsigned long tdr_pa;
 	unsigned long *tdcs_pa;
 
+	u64 attributes;
+	u64 xfam;
 	int hkid;
+
+	u64 tsc_offset;
 };
 
 struct vcpu_tdx {
@@ -39,6 +43,20 @@ static inline struct vcpu_tdx *to_tdx(struct kvm_vcpu *vcpu)
 {
 	return container_of(vcpu, struct vcpu_tdx, vcpu);
 }
+
+static __always_inline u64 td_tdcs_exec_read64(struct kvm_tdx *kvm_tdx, u32 field)
+{
+	struct tdx_module_args out;
+	u64 err;
+
+	err = tdh_mng_rd(kvm_tdx->tdr_pa, TDCS_EXEC(field), &out);
+	if (unlikely(err)) {
+		pr_err("TDH_MNG_RD[EXEC.0x%x] failed: 0x%llx\n", field, err);
+		return 0;
+	}
+	return out.r8;
+}
+
 #else
 struct kvm_tdx {
 	struct kvm kvm;
diff --git a/arch/x86/kvm/vmx/tdx_arch.h b/arch/x86/kvm/vmx/tdx_arch.h
index 569d59c55229..eb11618366b7 100644
--- a/arch/x86/kvm/vmx/tdx_arch.h
+++ b/arch/x86/kvm/vmx/tdx_arch.h
@@ -123,6 +123,12 @@ struct tdx_cpuid_value {
 #define TDX_TD_ATTRIBUTE_KL		BIT_ULL(31)
 #define TDX_TD_ATTRIBUTE_PERFMON	BIT_ULL(63)
 
+/*
+ * TODO: Once XFEATURE_CET_{U, S} in arch/x86/include/asm/fpu/types.h is
+ * defined, Replace these with define ones.
+ */
+#define TDX_TD_XFAM_CET	(BIT(11) | BIT(12))
+
 /*
  * TD_PARAMS is provided as an input to TDH_MNG_INIT, the size of which is 1024B.
  */
