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 X-Spam-Level: X-Spam-Status: No, score=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no 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 E952FC433E0 for ; Mon, 1 Mar 2021 17:04:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B731F6514E for ; Mon, 1 Mar 2021 17:04:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236788AbhCAREk (ORCPT ); Mon, 1 Mar 2021 12:04:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35250 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237348AbhCAQWJ (ORCPT ); Mon, 1 Mar 2021 11:22:09 -0500 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 94171C061756 for ; Mon, 1 Mar 2021 08:21:27 -0800 (PST) Received: by mail-pj1-x1032.google.com with SMTP id b15so11609725pjb.0 for ; Mon, 01 Mar 2021 08:21:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=jC2WGY5IvJY5a5GaOcvwnDc85miRJPUWJYADM2oq/Vk=; b=RSfR2jcli1GleHaRZ8Ny/9wJRvHkoiPuBTy1nY6AzKOBtnWAcufVR2eThF7uMxrbd4 SvCGy1dGOjeYf1HhmCoDZ/EvKnYgXPaJYPk09YdEcK5qALeK9p9zLRJPHI4NGz4qN8ms iIQhskrnUrHIIPW4aFVFr73y6frsAPhkGyu/lEl+uSA7r9o3/c7VpFCC1UT9ZLDhRlmL yz95t6qu75srosy1wuCKPV6h/87XbLBQIYmx3PT02V5jXdJkEhnWYrEAtgDp9gWo2xPv rHE2an4zDaVV6jHhu4JXXCUykswbc7dAHz52xBG5cIT0iIKVoLves2rKVfJ3107CpL7K /ELw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=jC2WGY5IvJY5a5GaOcvwnDc85miRJPUWJYADM2oq/Vk=; b=D4SC1SMyVcxg+NlKL6RGY/WXmFDGoQ4onVSkOHtClqlsBPQRX1hxvuYdbdCZ6zkuwl IihBdTA+3AMN9huEmkbW03CP2FGPmPcJ7nG7tRju6eK3/viyVhjzxtepA6j89Olj+pb2 sBnzAAs2PeUUPeTvT2Uq1JL+mqdG4c3Qhpitm4awIS7oW5bifl8ZYsgkgzxUY9p/re9P Lkg3Ce4sTVCnPLY2QMmMDsnLrw3poNNaEYOWt5Q8AIwtYqea15itNewQJMPGSMtwdj1b pd4e07JMABHdAVWsaQe+yKpegbhXkoliX/GtK5f6C6kF7IZ4fQEklmllc+Z4m1zFGGLs 7oUg== X-Gm-Message-State: AOAM533dRfQqsV6ARtJMfC/HFNaPVMWxN/ZnhrEDGHrhW0qi8UpMEkxQ O0d3Nv+w+xf9POI6gGYVDLcavw== X-Google-Smtp-Source: ABdhPJzDK3rT//fSp8J4fsSDT5s0A4TeJiUbKdNYMYyEOict+tnCU+C6QCR6dpG7EgSBrxC7OgBIEg== X-Received: by 2002:a17:902:c582:b029:e4:c16d:b5eb with SMTP id p2-20020a170902c582b02900e4c16db5ebmr1867568plx.6.1614615686845; Mon, 01 Mar 2021 08:21:26 -0800 (PST) Received: from google.com ([2620:15c:f:10:5d06:6d3c:7b9:20c9]) by smtp.gmail.com with ESMTPSA id z22sm18134271pfa.41.2021.03.01.08.21.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Mar 2021 08:21:26 -0800 (PST) Date: Mon, 1 Mar 2021 08:21:19 -0800 From: Sean Christopherson To: Kai Huang Cc: kvm@vger.kernel.org, x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, jarkko@kernel.org, luto@kernel.org, dave.hansen@intel.com, rick.p.edgecombe@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com Subject: Re: [PATCH 05/25] x86/sgx: Introduce virtual EPC for use by KVM guests Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 01, 2021, Kai Huang wrote: > + /* > + * SECS pages are "pinned" by child pages, an unpinned once all s/an/and > + * children have been EREMOVE'd. A child page in this instance > + * may have pinned an SECS page encountered in an earlier release(), > + * creating a zombie. Since some children were EREMOVE'd above, > + * try to EREMOVE all zombies in the hopes that one was unpinned. > + */ > + mutex_lock(&zombie_secs_pages_lock); > + list_for_each_entry_safe(epc_page, tmp, &zombie_secs_pages, list) { > + /* > + * Speculatively remove the page from the list of zombies, > + * if the page is successfully EREMOVE it will be added to > + * the list of free pages. If EREMOVE fails, throw the page > + * on the local list, which will be spliced on at the end. > + */ > + list_del(&epc_page->list); > + > + if (sgx_vepc_free_page(epc_page)) > + list_add_tail(&epc_page->list, &secs_pages); > + } > + > + if (!list_empty(&secs_pages)) > + list_splice_tail(&secs_pages, &zombie_secs_pages); > + mutex_unlock(&zombie_secs_pages_lock); > + > + kfree(vepc); > + > + return 0; > +}