From patchwork Fri Aug 6 00:09:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12422373 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E05FCC4320A for ; Fri, 6 Aug 2021 00:10:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C8BF8606A5 for ; Fri, 6 Aug 2021 00:10:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242942AbhHFAKn (ORCPT ); Thu, 5 Aug 2021 20:10:43 -0400 Received: from mga04.intel.com ([192.55.52.120]:45289 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242730AbhHFAKV (ORCPT ); Thu, 5 Aug 2021 20:10:21 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10067"; a="212422375" X-IronPort-AV: E=Sophos;i="5.84,299,1620716400"; d="scan'208";a="212422375" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Aug 2021 17:10:07 -0700 X-IronPort-AV: E=Sophos;i="5.84,299,1620716400"; d="scan'208";a="420562724" Received: from rmgular-mobl2.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.251.138.25]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Aug 2021 17:10:05 -0700 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Peter Zijlstra , Andy Lutomirski , Hans de Goede , Mark Gross , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: Peter H Anvin , Dave Hansen , Tony Luck , Dan Williams , Andi Kleen , Kirill Shutemov , Sean Christopherson , Kuppuswamy Sathyanarayanan , x86@kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v4 4/7] x86/tdx: Add SetupEventNotifyInterrupt TDX hypercall support Date: Thu, 5 Aug 2021 17:09:42 -0700 Message-Id: <20210806000946.2951441-5-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210806000946.2951441-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20210806000946.2951441-1-sathyanarayanan.kuppuswamy@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org SetupEventNotifyInterrupt TDX hypercall is used by guest TD to specify which interrupt vector to use as an event-notify vector to the VMM. Such registered vector is also used by Host VMM to notify about completion of GetQuote requests to the Guest TD. Add tdx_hcall_set_notify_intr() helper function to implement the SetupEventNotifyInterrupt hypercall. This will be used by the TD quote driver. Details about the SetupEventNotifyInterrupt TDVMCALL can be found in TDX Guest-Host Communication Interface (GHCI) Specification, sec 3.5 "TDG.VP.VMCALL". Reviewed-by: Tony Luck Reviewed-by: Andi Kleen Signed-off-by: Kuppuswamy Sathyanarayanan --- Change since v3: * None Change since v2: * Included TDVMCALL_SUCCESS case check in tdx_hcall_set_notify_intr(). arch/x86/kernel/tdx.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/arch/x86/kernel/tdx.c b/arch/x86/kernel/tdx.c index 203ddc4c8412..9fca354e014c 100644 --- a/arch/x86/kernel/tdx.c +++ b/arch/x86/kernel/tdx.c @@ -28,6 +28,7 @@ /* TDX hypercall Leaf IDs */ #define TDVMCALL_MAP_GPA 0x10001 #define TDVMCALL_GET_QUOTE 0x10002 +#define TDVMCALL_SETUP_NOTIFY_INTR 0x10004 /* TDX Module call error codes */ #define TDX_PAGE_ALREADY_ACCEPTED 0x00000b0a00000000 @@ -207,6 +208,32 @@ int tdx_hcall_get_quote(u64 data) } EXPORT_SYMBOL_GPL(tdx_hcall_get_quote); +/* + * tdx_hcall_set_notify_intr() - Setup Event Notify Interrupt Vector. + * + * @vector : Vector address to be used for notification. + * + * return 0 on success or failure error number. + */ +int tdx_hcall_set_notify_intr(u8 vector) +{ + u64 ret; + + /* Minimum vector value allowed is 32 */ + if (vector < 32) + return -EINVAL; + + ret = _trace_tdx_hypercall(TDVMCALL_SETUP_NOTIFY_INTR, vector, 0, 0, 0, + NULL); + + if (ret == TDVMCALL_SUCCESS) + return 0; + else if (ret == TDCALL_INVALID_OPERAND) + return -EINVAL; + + return -EIO; +} + static void tdg_get_info(void) { u64 ret;