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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3B4E2C3A5A7 for ; Thu, 8 Dec 2022 11:35:26 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p3FAr-0004pi-S0; Thu, 08 Dec 2022 06:34:46 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p3FAm-0004pA-5J for qemu-devel@nongnu.org; Thu, 08 Dec 2022 06:34:41 -0500 Received: from mga04.intel.com ([192.55.52.120]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p3FAj-0003XJ-Lh for qemu-devel@nongnu.org; Thu, 08 Dec 2022 06:34:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1670499277; x=1702035277; h=date:from:to:cc:subject:message-id:reply-to:references: mime-version:in-reply-to; bh=BNKj0Q3HaLW0QQmlzFra5ewPCCLiShH0XE7KzON/axc=; b=CFBmrARQBtj1dWTXIBHj1T8eNiPP1FmKEvEJwv7bloP24pSVvhqNeG4d g/XO/+pkKl4s4yhBju4WFtKOErJff2PQO8OBdviiwISVN9J9MYC0pRA6T uKSPOx1hDCEEUsp/OwjixzEbS9LpHDnaJxIFQVEU8FIy7gsi7/tqN4qS5 Drtf63+Jtf0Yd0dPj5OE5P9qQKKMnWRnQ9JaepmIWAt/Zvw1u4Pk718J+ buf6NTUgkQU5QF1nKgEbMYik3Zdjau6HdZ7v/2A3mpgb19ky8eCqXQ4IQ soGrSFC+eLBfb9oIG9PJ+QcE8bnALRx1YRbytfYquFKsFZg+QahxUFVbG Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10554"; a="315865234" X-IronPort-AV: E=Sophos;i="5.96,227,1665471600"; d="scan'208";a="315865234" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Dec 2022 03:34:34 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10554"; a="624670349" X-IronPort-AV: E=Sophos;i="5.96,227,1665471600"; d="scan'208";a="624670349" Received: from chaop.bj.intel.com (HELO localhost) ([10.240.193.75]) by orsmga006.jf.intel.com with ESMTP; 08 Dec 2022 03:34:22 -0800 Date: Thu, 8 Dec 2022 19:30:03 +0800 From: Chao Peng To: Xiaoyao Li Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org, qemu-devel@nongnu.org, Paolo Bonzini , Jonathan Corbet , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Arnd Bergmann , Naoya Horiguchi , Miaohe Lin , x86@kernel.org, "H . Peter Anvin" , Hugh Dickins , Jeff Layton , "J . Bruce Fields" , Andrew Morton , Shuah Khan , Mike Rapoport , Steven Price , "Maciej S . Szmigiero" , Vlastimil Babka , Vishal Annapurve , Yu Zhang , "Kirill A . Shutemov" , luto@kernel.org, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com, aarcange@redhat.com, ddutile@redhat.com, dhildenb@redhat.com, Quentin Perret , tabba@google.com, Michael Roth , mhocko@suse.com, wei.w.wang@intel.com Subject: Re: [PATCH v10 3/9] KVM: Extend the memslot to support fd-based private memory Message-ID: <20221208113003.GE1304936@chaop.bj.intel.com> References: <20221202061347.1070246-1-chao.p.peng@linux.intel.com> <20221202061347.1070246-4-chao.p.peng@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: none client-ip=192.55.52.120; envelope-from=chao.p.peng@linux.intel.com; helo=mga04.intel.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Chao Peng Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Dec 08, 2022 at 04:37:03PM +0800, Xiaoyao Li wrote: > On 12/2/2022 2:13 PM, Chao Peng wrote: > > .. > > > Together with the change, a new config HAVE_KVM_RESTRICTED_MEM is added > > and right now it is selected on X86_64 only. > > > > From the patch implementation, I have no idea why HAVE_KVM_RESTRICTED_MEM is > needed. The reason is we want KVM further controls the feature enabling. An opt-in CONFIG_RESTRICTEDMEM can cause problem if user sets that for unsupported architectures. Here is the original discussion: https://lore.kernel.org/all/YkJLFu98hZOvTSrL@google.com/ Thanks, Chao