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 F2ED3C25B0E for ; Sun, 7 Aug 2022 22:13:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242322AbiHGWK5 (ORCPT ); Sun, 7 Aug 2022 18:10:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241870AbiHGWHQ (ORCPT ); Sun, 7 Aug 2022 18:07:16 -0400 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6371CBC17; Sun, 7 Aug 2022 15:03:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1659909798; x=1691445798; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9k8hHT4h6MN648mDsUmZu+Cs5u9gYRKRacre65MQmzg=; b=P2zcuqkERoeJ36kwHn5dwZnO7VG6E4XplayhfnrHqnlS+ZHVc83Nr//V bDJTCptW8WqpO32gHfVIyHcgJgiWLYjTZUIs41CvREyP8Uv20QGL/0sMD MVrsR4FXXNPR4wJGpwz239Btf1JVTlR5RAt7VHpxBifLpkB0xFnyEVzqi YIVAZ5Ldrb4WGi3EQ88ADyfBzfmCtuC5ZNPcIoedLSP0d2cVibYLPCll3 rBq0WhiO28nHBvuxlSGTscMaOFfdDH0ZIjnwni5POeAQNhnlJoJ1prc6F ERMZ223EUw+g31CBU20WmYhmUVYOYLIUWh4PKIEilihIqxdG3ig7DL3qG w==; X-IronPort-AV: E=McAfee;i="6400,9594,10432"; a="270240400" X-IronPort-AV: E=Sophos;i="5.93,220,1654585200"; d="scan'208";a="270240400" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Aug 2022 15:02:43 -0700 X-IronPort-AV: E=Sophos;i="5.93,220,1654585200"; d="scan'208";a="663682737" Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Aug 2022 15:02:43 -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: [PATCH v8 089/103] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL Date: Sun, 7 Aug 2022 15:02:14 -0700 Message-Id: <78f8eae8b9286409bfde60d06a05d822cd246fc9.1659854791.git.isaku.yamahata@intel.com> 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 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 | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index c3cea3cb4d15..849bae37246a 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -906,8 +906,39 @@ static int tdx_handle_triple_fault(struct kvm_vcpu *vcpu) return 0; } +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 != 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 = kvm_r10_read(vcpu); + a0 = kvm_r11_read(vcpu); + a1 = kvm_r12_read(vcpu); + a2 = kvm_r13_read(vcpu); + a3 = kvm_r14_read(vcpu); + + ret = __kvm_emulate_hypercall(vcpu, nr, a0, a1, a2, a3, true); + + tdvmcall_set_return_code(vcpu, ret); + + 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; -- 2.25.1