From mboxrd@z Thu Jan 1 00:00:00 1970 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 85C4DC43219 for ; Thu, 5 May 2022 18:21:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1384222AbiEESYH (ORCPT ); Thu, 5 May 2022 14:24:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36390 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383307AbiEESTo (ORCPT ); Thu, 5 May 2022 14:19:44 -0400 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 884035DA7F; Thu, 5 May 2022 11:15:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651774559; x=1683310559; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=vov4jPM1ApnycITbC2fGVR7nHT4HZozduyZCEnCrz7k=; b=U7OVbY6GD/zEhanS7ssHU1Nn3NRKJ9bhEW/mPiLJ0iDBbJsAFuZ6uC6T IuZSAreN1ODMKNP5y/uO9E38zp9i4wDzGyTVkQM3kvT1QHbpxqoHSAMG3 T6PSW/LbARXcFQbEW2JpIrURfHj51qyo8zBY6Qetg736KKFXfx8e6eqEk Its+e6wonnt+2b358zwCcem/CCbBNqLYZ9kBSiqP/44rS28GYJG2W2tgA DmRkus4BtZQBOZ8U41Zp/hioMXutLEPX4DWTWV/PL42uXPQ8+0F62OSyx tJV8bGq6zRXlGflD0QdwTmNC/07h+Me99yJkKRLxr+b11bVZzS76HubKO g==; X-IronPort-AV: E=McAfee;i="6400,9594,10338"; a="268097121" X-IronPort-AV: E=Sophos;i="5.91,202,1647327600"; d="scan'208";a="268097121" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 May 2022 11:15:55 -0700 X-IronPort-AV: E=Sophos;i="5.91,202,1647327600"; d="scan'208";a="665083497" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 May 2022 11:15:55 -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 Subject: [RFC PATCH v6 098/104] KVM: TDX: Handle TDG.VP.VMCALL hypercall Date: Thu, 5 May 2022 11:15:32 -0700 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 d5bb5f1cbd21..4618934700cc 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1202,6 +1202,20 @@ static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu) return 1; } +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_report_fatal_error(struct kvm_vcpu *vcpu) { /* @@ -1297,6 +1311,8 @@ 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: return tdx_report_fatal_error(vcpu); case TDG_VP_VMCALL_MAP_GPA: -- 2.25.1