From nobody Mon Feb 9 10:32:37 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12D51FA3742 for ; Sun, 30 Oct 2022 06:25:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230083AbiJ3GZE (ORCPT ); Sun, 30 Oct 2022 02:25:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229828AbiJ3GYF (ORCPT ); Sun, 30 Oct 2022 02:24:05 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43BCBBC; Sat, 29 Oct 2022 23:24:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667111044; x=1698647044; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=jpCQcZecMNiOkK/TgcMHhl62N+vT7vM+ua/D84nFGlU=; b=RNhVN0buGE9GVKrc1k39uQOe1edPbgFchdEb9h2Kry/yMRcVYq0nh4CA bTfRCmo1brW9fWFFODased4gnLRJhp6n8jar+05x2uJbxU31HrTs50paR 5V2oovGimwY9d+NmrONrBxlzD40s1iHtKnPg+D3k8Qc3vZ/+l9A7Pp6I1 csmtJjMk5Ca4u3wAb/n11BYI/ZiVIyhUT2nN7AE+bJJY075O45hsglobw RHZJVOZMk4zBxIxF6lRVET4VJgwsCkfOLMs/yBWuqT4tO428BcaWVOLi/ GBaEEadoYaDLhFvxEWskhfH3hwujV90TpxWAZuZUISLoS/20c1+e7dyLy A==; X-IronPort-AV: E=McAfee;i="6500,9779,10515"; a="395037130" X-IronPort-AV: E=Sophos;i="5.95,225,1661842800"; d="scan'208";a="395037130" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Oct 2022 23:23:59 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10515"; a="878392885" X-IronPort-AV: E=Sophos;i="5.95,225,1661842800"; d="scan'208";a="878392885" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Oct 2022 23:23:59 -0700 From: isaku.yamahata@intel.com To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, Paolo Bonzini , erdemaktas@google.com, Sean Christopherson , Sagi Shahar , David Matlack , Sean Christopherson Subject: [PATCH v10 018/108] KVM: TDX: x86: Add ioctl to get TDX systemwide parameters Date: Sat, 29 Oct 2022 23:22:19 -0700 Message-Id: <178c7ceb19eace04d2745be0feb7623a5cf56738.1667110240.git.isaku.yamahata@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Sean Christopherson Implement a system-scoped ioctl to get system-wide parameters for TDX. Signed-off-by: Sean Christopherson Signed-off-by: Isaku Yamahata --- 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 0ceb8e58a6c0..4425564647cb 100644 --- a/arch/x86/include/asm/kvm-x86-ops.h +++ b/arch/x86/include/asm/kvm-x86-ops.h @@ -118,6 +118,7 @@ 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_hos= t.h index 50b39d0071ff..1fced310ec63 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1626,6 +1626,7 @@ struct kvm_x86_ops { int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate); void (*enable_smi_window)(struct kvm_vcpu *vcpu); =20 + 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 *ar= gp); 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/kv= m.h index 54b08789c402..2ad9666e02a5 100644 --- a/arch/x86/include/uapi/asm/kvm.h +++ b/arch/x86/include/uapi/asm/kvm.h @@ -535,4 +535,52 @@ struct kvm_pmu_event_filter { #define KVM_X86_DEFAULT_VM 0 #define KVM_X86_TDX_VM 1 =20 +/* Trust Domain eXtension sub-ioctl() commands. */ +enum kvm_tdx_cmd_id { + KVM_TDX_CAPABILITIES =3D 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 0918d1e6d2f3..aedba5acb8eb 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -203,6 +203,8 @@ struct kvm_x86_ops vt_x86_ops __initdata =3D { .complete_emulated_msr =3D kvm_complete_insn_gp, =20 .vcpu_deliver_sipi_vector =3D kvm_vcpu_deliver_sipi_vector, + + .dev_mem_enc_ioctl =3D tdx_dev_ioctl, }; =20 struct kvm_x86_init_ops vt_init_ops __initdata =3D { diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 64229c3b3c5a..5a3ed8217a54 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -431,6 +431,52 @@ int tdx_vm_init(struct kvm *kvm) return ret; } =20 +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) !=3D + 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 !=3D KVM_TDX_CAPABILITIES) + return -EINVAL; + + user_caps =3D (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 =3D (struct kvm_tdx_capabilities) { + .attrs_fixed0 =3D tdx_caps.attrs_fixed0, + .attrs_fixed1 =3D tdx_caps.attrs_fixed1, + .xfam_fixed0 =3D tdx_caps.xfam_fixed0, + .xfam_fixed1 =3D tdx_caps.xfam_fixed1, + .nr_cpuid_configs =3D tdx_caps.nr_cpuid_configs, + .padding =3D 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; +} + static 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 b2cb5786830a..057f2be3d818 100644 --- a/arch/x86/kvm/vmx/x86_ops.h +++ b/arch/x86/kvm/vmx/x86_ops.h @@ -135,6 +135,7 @@ int __init tdx_hardware_setup(struct kvm_x86_ops *x86_o= ps); bool tdx_is_vm_type_supported(unsigned long type); void tdx_hardware_unsetup(void); int tdx_offline_cpu(void); +int tdx_dev_ioctl(void __user *argp); =20 int tdx_vm_init(struct kvm *kvm); void tdx_mmu_release_hkid(struct kvm *kvm); @@ -144,6 +145,7 @@ 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 f= alse; } static inline void tdx_hardware_unsetup(void) {} static inline int tdx_offline_cpu(void) { return 0; } +static inline int tdx_dev_ioctl(void __user *argp) { return -EOPNOTSUPP; }; =20 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 25c30c8c2d9b..ddcbbcf13a55 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4678,6 +4678,12 @@ long kvm_arch_dev_ioctl(struct file *filp, r =3D kvm_x86_dev_has_attr(&attr); break; } + case KVM_MEMORY_ENCRYPT_OP: + r =3D -EINVAL; + if (!kvm_x86_ops.dev_mem_enc_ioctl) + goto out; + r =3D static_call(kvm_x86_dev_mem_enc_ioctl)(argp); + break; default: r =3D -EINVAL; break; diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include= /uapi/asm/kvm.h index 54b08789c402..2ad9666e02a5 100644 --- a/tools/arch/x86/include/uapi/asm/kvm.h +++ b/tools/arch/x86/include/uapi/asm/kvm.h @@ -535,4 +535,52 @@ struct kvm_pmu_event_filter { #define KVM_X86_DEFAULT_VM 0 #define KVM_X86_TDX_VM 1 =20 +/* Trust Domain eXtension sub-ioctl() commands. */ +enum kvm_tdx_cmd_id { + KVM_TDX_CAPABILITIES =3D 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 */ --=20 2.25.1