From patchwork Tue Feb 22 23:17:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 12756051 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 7C381C433FE for ; Tue, 22 Feb 2022 23:18:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236209AbiBVXSa (ORCPT ); Tue, 22 Feb 2022 18:18:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236193AbiBVXS1 (ORCPT ); Tue, 22 Feb 2022 18:18:27 -0500 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9ACC59027F; Tue, 22 Feb 2022 15:18:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645571881; x=1677107881; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=KUNQWjpDSRdh+ji0vwxWvKmA2fta9psHurefSdvpBeQ=; b=L+XnAUwd/4uMnuDK2vIDaXYGU9boeVLLMExhNuk93qhLQv18HYXb7/Gd 67AntiT0VnhQbfM6oExGoLkALkf1RX+Fidb0D/TL6hzpMN2+jEoQPPgA9 wbhRotrUHWXpxylGzQ7ZOEpAyqiUxT1htxPHuAd+N1iuRYgGD6EegVZ3r tIb4OB/k8YWcc3X0v6Vq7nlBmlRAlx0AmmO3QRyKhthZ7qCPEAUFgvmB+ S+/sl9h749lZuUK/ah8gw3eK9FbJzXhbQBV0+4kM0P7wi6UgRAs9cSmde qQUR0w542Q+GJakeuSZWxaqbCCzc73vev55pqZyAFpKYnWy7M6X3TOeYq w==; X-IronPort-AV: E=McAfee;i="6200,9189,10266"; a="231810096" X-IronPort-AV: E=Sophos;i="5.88,389,1635231600"; d="scan'208";a="231810096" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 15:18:01 -0800 X-IronPort-AV: E=Sophos;i="5.88,389,1635231600"; d="scan'208";a="776476639" Received: from skoppolu-mobl4.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.252.138.103]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 15:18:00 -0800 From: Kuppuswamy Sathyanarayanan To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, Hans de Goede , Mark Gross , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: "H . Peter Anvin" , Kuppuswamy Sathyanarayanan , Kuppuswamy Sathyanarayanan , "Kirill A . Shutemov" , Andy Shevchenko , Tony Luck , linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v1 3/6] x86/tdx: Add SetupEventNotifyInterrupt TDX hypercall support Date: Tue, 22 Feb 2022 15:17:32 -0800 Message-Id: <20220222231735.268919-4-sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220222231735.268919-1-sathyanarayanan.kuppuswamy@linux.intel.com> References: <20220222231735.268919-1-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 guest attestation driver. Details about the SetupEventNotifyInterrupt TDVMCALL can be found in TDX Guest-Host Communication Interface (GHCI) Specification, sec 3.5 "VP.VMCALL". Reviewed-by: Tony Luck Reviewed-by: Andi Kleen Signed-off-by: Kuppuswamy Sathyanarayanan --- arch/x86/coco/tdx.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/x86/coco/tdx.c b/arch/x86/coco/tdx.c index 2c07f9551d3b..d18508e6150f 100644 --- a/arch/x86/coco/tdx.c +++ b/arch/x86/coco/tdx.c @@ -22,6 +22,7 @@ /* TDX hypercall Leaf IDs */ #define TDVMCALL_MAP_GPA 0x10001 #define TDVMCALL_GET_QUOTE 0x10002 +#define TDVMCALL_SETUP_NOTIFY_INTR 0x10004 /* MMIO direction */ #define EPT_READ 0 @@ -175,6 +176,38 @@ int tdx_hcall_get_quote(void *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. + */ +static int tdx_hcall_set_notify_intr(u8 vector) +{ + u64 ret; + + /* Minimum vector value allowed is 32 */ + if (vector < 32) + return -EINVAL; + + /* + * Register callback vector address with VMM. More details + * about the ABI can be found in TDX Guest-Host-Communication + * Interface (GHCI), sec titled + * "TDG.VP.VMCALL". + */ + ret = _tdx_hypercall(TDVMCALL_SETUP_NOTIFY_INTR, vector, 0, 0, 0); + + if (ret) { + if (ret == TDCALL_INVALID_OPERAND) + return -EINVAL; + return -EIO; + } + + return 0; +} + static void get_info(void) { struct tdx_module_output out;