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 4F834C433EF for ; Mon, 27 Jun 2022 21:58:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241726AbiF0V6X (ORCPT ); Mon, 27 Jun 2022 17:58:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241580AbiF0Vzs (ORCPT ); Mon, 27 Jun 2022 17:55:48 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8938414D09; Mon, 27 Jun 2022 14:55:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1656366907; x=1687902907; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=YgV1xFu5YP/ElF21x2KrlvBL7tTG8eau0e2bIOp97ps=; b=aA/d/pmmhVvjnUmPUNwj766hAppzXYC271myA0tPKZU/W3AFQE1HUMrM O+xUPqbtQeYWtMca1YR8+W7C8+6Pl+WSiQ8S6d3w8om5vdQOQ+vdOwexw 3m7fPzuCZYcR2I902cUgz+PNpDupgmFNrsYb0hqznk9mvSjvtHrVzOxnc J/dFe/j9pTUtwSNrkAmt7DCFU+n72ItNrs0Rn1tmxQjKCkVinCvDEBEX5 zzr65JGRxLoscpWeyYv+kRcBp8DgMBTGoFh5vtDmMKKn8h+Y/YTaolu5N 7o0iloaDSFKT7phghcIrAVjCdDmExs2isYBjwgl1zCnbh854Bfcygp+Sc Q==; X-IronPort-AV: E=McAfee;i="6400,9594,10391"; a="279116137" X-IronPort-AV: E=Sophos;i="5.92,227,1650956400"; d="scan'208";a="279116137" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2022 14:55:01 -0700 X-IronPort-AV: E=Sophos;i="5.92,227,1650956400"; d="scan'208";a="657863727" 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; 27 Jun 2022 14:55:01 -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 Subject: [PATCH v7 088/102] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL Date: Mon, 27 Jun 2022 14:54:20 -0700 Message-Id: <84daf515aa16b748bffb4e7ec7e1e24466a75e66.1656366338.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: kvm@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 c9663df83292..a30be04229d7 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -919,8 +919,39 @@ 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