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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA6BAC7EE25 for ; Thu, 8 Jun 2023 00:08:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 69BD36B0072; Wed, 7 Jun 2023 20:08:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 64C348E0002; Wed, 7 Jun 2023 20:08:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 513698E0001; Wed, 7 Jun 2023 20:08:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 3ECDF6B0072 for ; Wed, 7 Jun 2023 20:08:43 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 0BDFBC031B for ; Thu, 8 Jun 2023 00:08:43 +0000 (UTC) X-FDA: 80877644526.25.A84E7D1 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by imf05.hostedemail.com (Postfix) with ESMTP id E8D25100009 for ; Thu, 8 Jun 2023 00:08:40 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Teh4wRKG; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf05.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 192.55.52.88) smtp.mailfrom=kirill.shutemov@linux.intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1686182921; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=pjQ2LZxOCMd8soWuHmJH2kRHfDO1GIqt5N4L2FELu5I=; b=e4ByA/78Pyc5aq+L7xvjvR6FFtXrqkpEWRdkPQeVQBCmD+fS0me6NbWq6qkqaOWwtVZ+Jd 2Jz+uXv17b6hBRZyk4LJ8UJgn+aHLwK7eC3XT/cQnga6ISY5eAexPMsR3DzVhjHzcYX9eJ og4TSPp2fZizqKmc9LoaTpbQHZ0c1so= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Teh4wRKG; dmarc=pass (policy=none) header.from=intel.com; spf=none (imf05.hostedemail.com: domain of kirill.shutemov@linux.intel.com has no SPF policy when checking 192.55.52.88) smtp.mailfrom=kirill.shutemov@linux.intel.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1686182921; a=rsa-sha256; cv=none; b=Z+1abzENHRZcLKo3JLjGZmCCWk27tWYrvz4SrVAFMpDQqasZaUMQoAUKfpORh8vdpcgdNC x0o1dzcSHQwJc2OqkCdSBBM+WZUMkBY8aYXKYCzKxRktsDI85sDuD0zdiQmpXYiGAWkzCn O6hzBJxhKhr2pRPjrK9ENMnsBrMivaI= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1686182920; x=1717718920; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=1hzioKQ/N8dq4Quaj9gu8PIF2snj8PPWSmrQicnFLUo=; b=Teh4wRKGfFhmSXl2UrrPsgEgMerjA2veFzJR7HHo9TxIqal+EoXDsBAE nzqfhfatLRjeyH0OrW7YVGByB/BcFi3zC0XdK8LOjt7kQhoVzy1EAWuk6 n3ixGHcw43BJ9vuTbhFMaGGUGLsEVGVKfZVKcOsWDlr6d9YzA2M6kYrSK IAXyQ/eP3Mxv1ktK/FYAndmtm1NDHaKl9IsFC6G5+K2KmNUE3d5auebv6 1Qu1JbglFkLZI5JgGkPwwfaPZ6rTBWnak9e88044bECrGZqwp6AQD+0OU 0wyh+woN9dlLmxKczYZ+Weu9jhgI+6FCRef++n74w6t4kdNXyTCQ/M2In g==; X-IronPort-AV: E=McAfee;i="6600,9927,10734"; a="385482383" X-IronPort-AV: E=Sophos;i="6.00,225,1681196400"; d="scan'208";a="385482383" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jun 2023 17:08:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10734"; a="854106798" X-IronPort-AV: E=Sophos;i="6.00,225,1681196400"; d="scan'208";a="854106798" Received: from zhanzhiw-mobl2.ger.corp.intel.com (HELO box.shutemov.name) ([10.249.42.209]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jun 2023 17:08:34 -0700 Received: by box.shutemov.name (Postfix, from userid 1000) id B412A10F0E0; Thu, 8 Jun 2023 03:08:31 +0300 (+03) Date: Thu, 8 Jun 2023 03:08:31 +0300 From: kirill.shutemov@linux.intel.com To: Kai Huang Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, dave.hansen@intel.com, tony.luck@intel.com, peterz@infradead.org, tglx@linutronix.de, seanjc@google.com, pbonzini@redhat.com, david@redhat.com, dan.j.williams@intel.com, rafael.j.wysocki@intel.com, ying.huang@intel.com, reinette.chatre@intel.com, len.brown@intel.com, ak@linux.intel.com, isaku.yamahata@intel.com, chao.gao@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, bagasdotme@gmail.com, sagis@google.com, imammedo@redhat.com Subject: Re: [PATCH v11 06/20] x86/virt/tdx: Handle SEAMCALL running out of entropy error Message-ID: <20230608000831.2rjrhdaf7qs6bjnv@box.shutemov.name> References: <9b3582c9f3a81ae68b32d9997fcd20baecb63b9b.1685887183.git.kai.huang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9b3582c9f3a81ae68b32d9997fcd20baecb63b9b.1685887183.git.kai.huang@intel.com> X-Rspamd-Queue-Id: E8D25100009 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: o3xesz5idifikpyq54jrwnhtpq35bonu X-HE-Tag: 1686182920-404364 X-HE-Meta: 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 VM9Pdghx wzTbEhFEEhvbHGJm5A9cU48gJVIGGDLJTQrJZ2H1/6zwb2ta7RvGvbQPTgxdSwWDwWbVDgwq2wGwlUMWI3zXCcu5D3nY/YIMwK9PVYHRtboPfcXUSveyvG2QCngh7yw0FZ5wN X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Jun 05, 2023 at 02:27:19AM +1200, Kai Huang wrote: > Certain SEAMCALL leaf functions may return error due to running out of > entropy, in which case the SEAMCALL should be retried as suggested by > the TDX spec. > > Handle this case in SEAMCALL common function. Mimic the existing > rdrand_long() to retry RDRAND_RETRY_LOOPS times. > > Signed-off-by: Kai Huang Reviewed-by: Kirill A. Shutemov -- Kiryl Shutsemau / Kirill A. Shutemov