From nobody Wed Dec 31 06:41:40 2025 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 0ECB6C4167B for ; Tue, 7 Nov 2023 14:58:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343525AbjKGO6c (ORCPT ); Tue, 7 Nov 2023 09:58:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34992 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234781AbjKGO5z (ORCPT ); Tue, 7 Nov 2023 09:57:55 -0500 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A4FC1D7A; Tue, 7 Nov 2023 06:57:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1699369070; x=1730905070; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=vLgUmjmBLc3J6I9Eg/cKgAU8/9ugkH9ESWoL90woQ1s=; b=PaoNax7s6zPkyYU0WFPWnwuQVGIgXc1onZr0x5lHRASY2MCZGZ9u0Ktp V12RIWGOe3MuGRedDIaZrtsgw8UzMPFZrmvQ7va+iYMZV4GZNrRFPdoR3 dmb60tnKosAJYD5FA/Frns6ay5Pf0c/UOdt6IY4eGzZCRWcMqIZM9GQ1G bxvoAKxhcc5hf5crbIxjG1BjccTrxt0SxONQkiay8jMBUakBxZaleFunF NRKsUbXXuPzmQ6EuCcoHMqTLndnt2UkwL36+1oVaALK0up1QHevyqeUvy c38EeFaTtaxAbPOYR940gWJEsdu6qnxgwSqwN+ioRMy7QmuuQXiUlw/Jc w==; X-IronPort-AV: E=McAfee;i="6600,9927,10887"; a="374555728" X-IronPort-AV: E=Sophos;i="6.03,284,1694761200"; d="scan'208";a="374555728" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2023 06:57:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,284,1694761200"; d="scan'208";a="10444001" Received: from ls.sc.intel.com (HELO localhost) ([172.25.112.31]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2023 06:57:47 -0800 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, hang.yuan@intel.com, tina.zhang@intel.com Subject: [PATCH v17 012/116] KVM: TDX: Retry SEAMCALL on the lack of entropy error Date: Tue, 7 Nov 2023 06:55:38 -0800 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Isaku Yamahata Some SEAMCALL may return TDX_RND_NO_ENTROPY error when the entropy is lacking. Retry SEAMCALL on the error following rdrand_long() to retry RDRAND_RETRY_LOOPS times. Signed-off-by: Isaku Yamahata Reviewed-by: Binbin Wu --- arch/x86/kvm/vmx/tdx_errno.h | 1 + arch/x86/kvm/vmx/tdx_ops.h | 40 +++++++++++++++++++++--------------- 2 files changed, 24 insertions(+), 17 deletions(-) diff --git a/arch/x86/kvm/vmx/tdx_errno.h b/arch/x86/kvm/vmx/tdx_errno.h index 7f96696b8e7c..bb093e292fef 100644 --- a/arch/x86/kvm/vmx/tdx_errno.h +++ b/arch/x86/kvm/vmx/tdx_errno.h @@ -14,6 +14,7 @@ #define TDX_OPERAND_INVALID 0xC000010000000000ULL #define TDX_OPERAND_BUSY 0x8000020000000000ULL #define TDX_PREVIOUS_TLB_EPOCH_BUSY 0x8000020100000000ULL +#define TDX_RND_NO_ENTROPY 0x8000020300000000ULL #define TDX_VCPU_NOT_ASSOCIATED 0x8000070200000000ULL #define TDX_KEY_GENERATION_FAILED 0x8000080000000000ULL #define TDX_KEY_STATE_INCORRECT 0xC000081100000000ULL diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h index 12fd6b8d49e0..a55977626ae3 100644 --- a/arch/x86/kvm/vmx/tdx_ops.h +++ b/arch/x86/kvm/vmx/tdx_ops.h @@ -6,6 +6,7 @@ =20 #include =20 +#include #include #include #include @@ -17,25 +18,30 @@ static inline u64 tdx_seamcall(u64 op, u64 rcx, u64 rdx, u64 r8, u64 r9, struct tdx_module_args *out) { + int retry; u64 ret; =20 - if (out) { - *out =3D (struct tdx_module_args) { - .rcx =3D rcx, - .rdx =3D rdx, - .r8 =3D r8, - .r9 =3D r9, - }; - ret =3D __seamcall_ret(op, out); - } else { - struct tdx_module_args args =3D { - .rcx =3D rcx, - .rdx =3D rdx, - .r8 =3D r8, - .r9 =3D r9, - }; - ret =3D __seamcall(op, &args); - } + /* Mimic the existing rdrand_long() to retry RDRAND_RETRY_LOOPS times. */ + retry =3D RDRAND_RETRY_LOOPS; + do { + if (out) { + *out =3D (struct tdx_module_args) { + .rcx =3D rcx, + .rdx =3D rdx, + .r8 =3D r8, + .r9 =3D r9, + }; + ret =3D __seamcall_ret(op, out); + } else { + struct tdx_module_args args =3D { + .rcx =3D rcx, + .rdx =3D rdx, + .r8 =3D r8, + .r9 =3D r9, + }; + ret =3D __seamcall(op, &args); + } + } while (unlikely(ret =3D=3D TDX_RND_NO_ENTROPY) && --retry); if (unlikely(ret =3D=3D TDX_SEAMCALL_UD)) { /* * SEAMCALLs fail with TDX_SEAMCALL_UD returned when VMX is off. --=20 2.25.1