From nobody Mon Sep 15 11:35:00 2025 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 F002DC54EBD for ; Thu, 12 Jan 2023 16:41:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240438AbjALQlK (ORCPT ); Thu, 12 Jan 2023 11:41:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234821AbjALQh1 (ORCPT ); Thu, 12 Jan 2023 11:37:27 -0500 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41CEC12A92; Thu, 12 Jan 2023 08:33:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1673541227; x=1705077227; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8sgh5LVThyz19ct5D24wjqu+zfNYK4knhiAU3u6blFI=; b=PLwLx6Cu1IlEBYKRvaWOe32lrX5zcYsjll7oiKBTLOVU8SRSQrrlz3Mr 24DnrssAfSRHWLdVVnnSnhP7292joNuaguKfhfB2NEZjRN+XelcnVu2LW 71Ce9N8wdPTateZLM/yz6+4P9Y7erxPHsErg3usDFWtx6QCDsGHEn+oQ8 1kaCCW2fvAHJepvVsp7GXzBPkMOaGsV2MQb8aCUdAQrXT0e/r9ZgjD0b+ 3C7JnPIWcK/vZWHpYatgkWytav285Ubm6XP0HOV9Xg+r4aam+LWHZS77q wCRUqUdS6BzBHK6Aihi4dOfv5SxXFXzvewLP714FUsM8SkSgw2+WoAYvQ w==; X-IronPort-AV: E=McAfee;i="6500,9779,10588"; a="386089770" X-IronPort-AV: E=Sophos;i="5.97,211,1669104000"; d="scan'208";a="386089770" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2023 08:33:37 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10588"; a="726372589" X-IronPort-AV: E=Sophos;i="5.97,211,1669104000"; d="scan'208";a="726372589" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2023 08:33:37 -0800 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 Subject: [PATCH v11 100/113] KVM: TDX: Handle TDG.VP.VMCALL hypercall Date: Thu, 12 Jan 2023 08:32:48 -0800 Message-Id: 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: Isaku Yamahata Implement TDG.VP.VMCALL hypercall. If the input value is zero, return success code and zero in output registers. TDG.VP.VMCALL hypercall is a subleaf of TDG.VP.VMCALL to enumerate which TDG.VP.VMCALL sub leaves are supported. This hypercall is for future enhancement of the Guest-Host-Communication Interface (GHCI) specification. The GHCI version of 344426-001US defines it to require input R12 to be zero and to return zero in output registers, R11, R12, R13, and R14 so that guest TD enumerates no enhancement. Signed-off-by: Isaku Yamahata --- arch/x86/kvm/vmx/tdx.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 486d0f0c6dd1..2f3206551c48 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1181,6 +1181,20 @@ static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu) return 1; } =20 +static int tdx_get_td_vm_call_info(struct kvm_vcpu *vcpu) +{ + if (tdvmcall_a0_read(vcpu)) + tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND); + else { + tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_SUCCESS); + kvm_r11_write(vcpu, 0); + tdvmcall_a0_write(vcpu, 0); + tdvmcall_a1_write(vcpu, 0); + tdvmcall_a2_write(vcpu, 0); + } + return 1; +} + static int tdx_map_gpa(struct kvm_vcpu *vcpu) { struct kvm *kvm =3D vcpu->kvm; @@ -1250,6 +1264,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) return tdx_emulate_rdmsr(vcpu); case EXIT_REASON_MSR_WRITE: return tdx_emulate_wrmsr(vcpu); + case TDG_VP_VMCALL_GET_TD_VM_CALL_INFO: + return tdx_get_td_vm_call_info(vcpu); case TDG_VP_VMCALL_REPORT_FATAL_ERROR: /* * Exit to userspace device model for tear down. --=20 2.25.1