From nobody Sun Sep 7 12:25:10 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 7A64ECDB482 for ; Mon, 16 Oct 2023 16:34:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234183AbjJPQeV (ORCPT ); Mon, 16 Oct 2023 12:34:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234184AbjJPQdl (ORCPT ); Mon, 16 Oct 2023 12:33:41 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43FE5479D; Mon, 16 Oct 2023 09:20:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697473238; x=1729009238; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=i2dR5ItEFftjCJiG59AV7yvV3LMkSNvIShT4KE4blHc=; b=IdXH+4oX3GWvmS/gKvAO4hXzJjHAJjdnqyYY1xIfFQfZDBHZBRw1nJR5 X0Pe0F0awbvMxUnhApgjZda/bntUf6PvPfyQimp3TlMgXr0ehJfPpmR/L sOzbAWhGdgHaHfc3q+BPSorY/an6V2BqDP6VSfSdgBb7zywLPcPBXrzP8 0n+RaDiUAkPMoso6M1e/shBReLTKCjdzi31lAuuU9ksMSvk7Aw0yivZSj 9/hfGxIMXzLj2ulLiI4wFX1MCdtRzV8GgOYtAAoR0AzcR4NnVUxVV2Mhh jVPWlmhKgeupQd9xGq+2DGEBjrJsmG4xpdqOplzYAhCisbHGabaNolH/Z A==; X-IronPort-AV: E=McAfee;i="6600,9927,10865"; a="364922025" X-IronPort-AV: E=Sophos;i="6.03,229,1694761200"; d="scan'208";a="364922025" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2023 09:16:03 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10865"; a="846448289" X-IronPort-AV: E=Sophos;i="6.03,229,1694761200"; d="scan'208";a="846448289" Received: from ls.sc.intel.com (HELO localhost) ([172.25.112.31]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Oct 2023 09:16:03 -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 , Kai Huang , Zhi Wang , chen.bo@intel.com, hang.yuan@intel.com, tina.zhang@intel.com Subject: [PATCH v16 089/116] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL Date: Mon, 16 Oct 2023 09:14:41 -0700 Message-Id: <9833756b73569332788c493dc67d5ee9291f1088.1697471314.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: Isaku Yamahata The TDX Guest-Host communication interface (GHCI) specification defines the ABI for the guest TD to issue hypercall. It reserves vendor specific arguments for VMM specific use. Use it as KVM hypercall and handle it. Signed-off-by: Isaku Yamahata --- arch/x86/kvm/vmx/tdx.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index fa1cf0a8b5f9..89e92c696760 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -982,8 +982,41 @@ static int tdx_handle_triple_fault(struct kvm_vcpu *vc= pu) return 0; } =20 +static int tdx_emulate_vmcall(struct kvm_vcpu *vcpu) +{ + unsigned long nr, a0, a1, a2, a3, ret; + + /* + * ABI for KVM tdvmcall argument: + * In Guest-Hypervisor Communication Interface(GHCI) specification, + * Non-zero leaf number (R10 !=3D 0) is defined to indicate + * vendor-specific. KVM uses this for KVM hypercall. NOTE: KVM + * hypercall number starts from one. Zero isn't used for KVM hypercall + * number. + * + * R10: KVM hypercall number + * arguments: R11, R12, R13, R14. + */ + nr =3D kvm_r10_read(vcpu); + a0 =3D kvm_r11_read(vcpu); + a1 =3D kvm_r12_read(vcpu); + a2 =3D kvm_r13_read(vcpu); + a3 =3D kvm_r14_read(vcpu); + + ret =3D __kvm_emulate_hypercall(vcpu, nr, a0, a1, a2, a3, true, 0); + + tdvmcall_set_return_code(vcpu, ret); + + if (nr =3D=3D KVM_HC_MAP_GPA_RANGE && !ret) + return 0; + return 1; +} + static int handle_tdvmcall(struct kvm_vcpu *vcpu) { + if (tdvmcall_exit_type(vcpu)) + return tdx_emulate_vmcall(vcpu); + switch (tdvmcall_leaf(vcpu)) { default: break; --=20 2.25.1