From patchwork Thu Feb 27 01:20:12 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Binbin Wu X-Patchwork-Id: 13993412 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DF9B61A83E6; Thu, 27 Feb 2025 01:19:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740619167; cv=none; b=tPKlJSy9b++Q4ccAD6OxjwHl1iS67cHH92BLenAnxMh1HcQBG9AQHoDbT8TppCUF0wEzNq7McUk1BgZyiDIAFWpqSv0bDkBX/cVIgIS79kfZe3dsOODGKJdwUGjG54Akwz+JOmCRYUYzqmB1kjApe3kMGfa25pu4qnrrYk2gM+0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740619167; c=relaxed/simple; bh=lEHEJBGNv7Z2ZmoEjKOLCQwWgl97DVj2RsejJ+To+VM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Us2Zu++9kTazA37qvQ4CN76i4+jo1IH8T0nnFat3E+e5mtCIjMdyoTTcRJctT5HqDmVvUW4BOxEi863vbtRYoWGZpkNi0tP18BTNcVv6hwdVz1Fk4EQ7R+QXivKaqP3pbrQLtLE8EVnOrkopemvo+2akwhZBk7w3gfEd9UYLxpk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=QUDCEqIp; arc=none smtp.client-ip=198.175.65.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="QUDCEqIp" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1740619166; x=1772155166; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=lEHEJBGNv7Z2ZmoEjKOLCQwWgl97DVj2RsejJ+To+VM=; b=QUDCEqIp/ikRVel9mP3PC9NFNZfl54C8yW/R+lMF9mvBF4jj49DiFTEn BxWgmVPLC4AziWf+nV5N7q9T8AU5lWUKLFJfavhPxrY2LZgDyU6URtNgT oEnR2WDYmxheDwf+SwalwNVPCJpf1gqkIElzPLkfFABRWE+KCa+31yq8b 7JgSqbo8JQZTvLN7gzp6CoqYDGiJfx4f9wf4R4RRcC/GLm9qVDNrCfCEd ovQFvxjsDNAhWLtRX0zk3qqzp+gBAiJDiPfRGPHaKolfbULZFh1SaaTqA aDTdknvyMLXT/CWkMnqaRlg8g3G3FZRhaPrewO38VjU6AiM2QxUgEUs7o w==; X-CSE-ConnectionGUID: kJFl6CeoSiib36MIWREWMw== X-CSE-MsgGUID: XPizCEjnQ1mIE1KbWPCoQw== X-IronPort-AV: E=McAfee;i="6700,10204,11357"; a="63959632" X-IronPort-AV: E=Sophos;i="6.13,318,1732608000"; d="scan'208";a="63959632" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2025 17:19:26 -0800 X-CSE-ConnectionGUID: +OlgE+0bRomnfoTj7CiJwg== X-CSE-MsgGUID: cm2TS4g5Q1KaSsnlAxP6Dg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,318,1732608000"; d="scan'208";a="116674906" Received: from litbin-desktop.sh.intel.com ([10.239.156.93]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Feb 2025 17:19:22 -0800 From: Binbin Wu To: pbonzini@redhat.com, seanjc@google.com, kvm@vger.kernel.org Cc: rick.p.edgecombe@intel.com, kai.huang@intel.com, adrian.hunter@intel.com, reinette.chatre@intel.com, xiaoyao.li@intel.com, tony.lindgren@intel.com, isaku.yamahata@intel.com, yan.y.zhao@intel.com, chao.gao@intel.com, linux-kernel@vger.kernel.org, binbin.wu@linux.intel.com Subject: [PATCH v2 11/20] KVM: TDX: Handle TDG.VP.VMCALL hypercall Date: Thu, 27 Feb 2025 09:20:12 +0800 Message-ID: <20250227012021.1778144-12-binbin.wu@linux.intel.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20250227012021.1778144-1-binbin.wu@linux.intel.com> References: <20250227012021.1778144-1-binbin.wu@linux.intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 Signed-off-by: Binbin Wu --- TDX "the rest" v2: - Use vp_enter_args directly instead of helpers. - Skip setting return code as TDVMCALL_STATUS_SUCCESS. - Skip setting tdx->vp_enter_args.r12 to 0 because it already is 0. TDX "the rest" v1: - Use TDVMCALL_STATUS prefix for TDX call status codes (Binbin) v19: - rename TDG_VP_VMCALL_GET_TD_VM_CALL_INFO => TDVMCALL_GET_TD_VM_CALL_INFO --- arch/x86/include/asm/shared/tdx.h | 1 + arch/x86/kvm/vmx/tdx.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h index f23657350d28..606d93a1cbac 100644 --- a/arch/x86/include/asm/shared/tdx.h +++ b/arch/x86/include/asm/shared/tdx.h @@ -67,6 +67,7 @@ #define TD_CTLS_LOCK BIT_ULL(TD_CTLS_LOCK_BIT) /* TDX hypercall Leaf IDs */ +#define TDVMCALL_GET_TD_VM_CALL_INFO 0x10000 #define TDVMCALL_MAP_GPA 0x10001 #define TDVMCALL_GET_QUOTE 0x10002 #define TDVMCALL_REPORT_FATAL_ERROR 0x10003 diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 76764bf5ba29..dbc9fffcbc26 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1422,6 +1422,20 @@ static int tdx_emulate_mmio(struct kvm_vcpu *vcpu) return 1; } +static int tdx_get_td_vm_call_info(struct kvm_vcpu *vcpu) +{ + struct vcpu_tdx *tdx = to_tdx(vcpu); + + if (tdx->vp_enter_args.r12) + tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_INVALID_OPERAND); + else { + tdx->vp_enter_args.r11 = 0; + tdx->vp_enter_args.r13 = 0; + tdx->vp_enter_args.r14 = 0; + } + return 1; +} + static int handle_tdvmcall(struct kvm_vcpu *vcpu) { switch (tdvmcall_leaf(vcpu)) { @@ -1429,6 +1443,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) return tdx_map_gpa(vcpu); case TDVMCALL_REPORT_FATAL_ERROR: return tdx_report_fatal_error(vcpu); + case TDVMCALL_GET_TD_VM_CALL_INFO: + return tdx_get_td_vm_call_info(vcpu); default: break; }