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 5080DC77B7A for ; Mon, 29 May 2023 04:29:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232238AbjE2E33 (ORCPT ); Mon, 29 May 2023 00:29:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231947AbjE2E2f (ORCPT ); Mon, 29 May 2023 00:28:35 -0400 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4ECEC1723; Sun, 28 May 2023 21:25:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1685334304; x=1716870304; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=j4UaGjqUHdHWF5P+EfOyo+SrZ3HJFlS7UZYjla+5tLQ=; b=ntytWpCwLjuY8kPkTx/UlVXePINYi09WONzcTIUxTtvZzNDdjtLtvmuC 0gS6Ta+SxM6B1w6GAUvPvdH5BGXZ1HaR32NGug6kiPtZkgGKE3+d/wbJd 092i+NQC7NyVmc01CMXKWQbOi3KPPc88IxCKGxXZt7kC+2tMHI9IFQL7e iG8aP0eZTshxZci4IOOV7ojXjx7zsjImsWBD5c4K7OoV7s0nDVfRyVEAr gqC8gVQLPWlYMEoG96LWKEVDtCdwXpWgdta3BfZVYw4+FveY3o4G6D8Di LoK0ctczxDDaQmCuI0UOICbePJpH4b0fKu/6kERnZp28LIXNJEvtb6JYP A==; X-IronPort-AV: E=McAfee;i="6600,9927,10724"; a="356993402" X-IronPort-AV: E=Sophos;i="6.00,200,1681196400"; d="scan'208";a="356993402" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2023 21:21:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10724"; a="830223409" X-IronPort-AV: E=Sophos;i="6.00,200,1681196400"; d="scan'208";a="830223409" Received: from ls.sc.intel.com (HELO localhost) ([172.25.112.31]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2023 21:21:38 -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 Subject: [PATCH v14 089/113] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL Date: Sun, 28 May 2023 21:20:11 -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 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 f4ac5b4662e1..8d3a5f9d208a 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -868,8 +868,39 @@ 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