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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A842C46CA1 for ; Mon, 18 Sep 2023 16:02:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229838AbjIRQCj (ORCPT ); Mon, 18 Sep 2023 12:02:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45718 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229675AbjIRQCi (ORCPT ); Mon, 18 Sep 2023 12:02:38 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C54BF30F4 for ; Mon, 18 Sep 2023 09:02:23 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-d7ec535fe42so4844489276.1 for ; Mon, 18 Sep 2023 09:01:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1695052667; x=1695657467; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=s17YssV/eLMk3v6BQw21PztJLVQ1uDSUDnGyHA0nJic=; b=29mFCgzEaKXgI7BJZgdelVVGImtdHCE2jfWHG7m0Kw0Ihmz69s1VSQ4NvYUCM6MJol A9yr4B7MUuqqWO9htV1FHHai+1Wf6SeDdosUaIQhlIdAVUWgadhsgqOCJHybVx08RyUf j0KXbhEe6dYJ9g7Sh2neYuUkRUevWzwLdDSU8u6cCI4tPtvcvBprx15w0BN8eTfqO7kl 6Dgqn4BODRv4r+XzJjGkwpkVWEUz3GbSoYbMgBJhlqUoasBORVmSAQFFSiGpTtJQrEOl YwQpxNh3jBhjxcv5+WtUiau53mI8EgAEEqSkeKzyPNuAqZ4PkfjAnfhBVK+JuhypuyiU CN4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695052667; x=1695657467; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=s17YssV/eLMk3v6BQw21PztJLVQ1uDSUDnGyHA0nJic=; b=V5BKGDkVhi51T5csfPCrspEiZbN9CrnUGLJ6OodCya0mdxfwFtAnoRFf8U4vb1f5mm zwZX88hyWhmSPejlgZcfZGIao3Jhfi/Fk9frFr78VXxMwoFhmkAHGxFUjQJXwLRaUKlk 1+JOB5lOKQqXVwMXIEwh/HF+uLxtyhkdkOe8/6Mt74yXt/s8X7lZO7dp6i0sXUhCwF// 4h5ibTmP7XuswDIaDF9l96xdqjCIuPkCohhvWSliaNh8jpjGrMKtp7CAJuko5f4sFqIb WFkAlYsj5fPhHZnMSULx64IzHsvybSOJxagHd1bw5jN7S8qDJqrOkdzzV8LCbFX5t9tq slUg== X-Gm-Message-State: AOJu0Ywdpc7gBdJ8hWz+cHG47z739RkHxRkVDsGs8/k2kHvukZpf9URr LBltEOOHU/rVAiaqaJaBsJjguxMheKE= X-Google-Smtp-Source: AGHT+IFqXVMaW5EWUR3sn7RRHAULv1S9Ax+JzluU+Y462jgw29bgpZAEkbL739S68Hx7QOlYkiFqSLcGAUw= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6902:4cf:b0:d7f:f3e:74ab with SMTP id v15-20020a05690204cf00b00d7f0f3e74abmr227961ybs.1.1695052667494; Mon, 18 Sep 2023 08:57:47 -0700 (PDT) Date: Mon, 18 Sep 2023 08:57:45 -0700 In-Reply-To: <9925e01b-7fa9-95e4-dc21-1d760ef9cde4@linux.intel.com> Mime-Version: 1.0 References: <20230914015531.1419405-1-seanjc@google.com> <20230914015531.1419405-11-seanjc@google.com> <9925e01b-7fa9-95e4-dc21-1d760ef9cde4@linux.intel.com> Message-ID: Subject: Re: [RFC PATCH v12 10/33] KVM: Set the stage for handling only shared mappings in mmu_notifier events From: Sean Christopherson To: Binbin Wu Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Paolo Bonzini , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , "Matthew Wilcox (Oracle)" , Andrew Morton , Paul Moore , James Morris , "Serge E. Hallyn" , Chao Peng , Fuad Tabba , Jarkko Sakkinen , Anish Moorthy , Yu Zhang , Isaku Yamahata , Xu Yilun , Vlastimil Babka , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" Content-Type: text/plain; charset="us-ascii" Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On Mon, Sep 18, 2023, Binbin Wu wrote: > > > On 9/14/2023 9:55 AM, Sean Christopherson wrote: > > Add flags to "struct kvm_gfn_range" to let notifier events target only > > shared and only private mappings, and write up the existing mmu_notifier > > events to be shared-only (private memory is never associated with a > > userspace virtual address, i.e. can't be reached via mmu_notifiers). > > > > Add two flags so that KVM can handle the three possibilities (shared, > > private, and shared+private) without needing something like a tri-state > > enum. > > How to understand the word "stage" in short log? Sorry, it's an idiom[*] that essentially means "to prepare for". I'll rephrase the shortlog to be more straightforward (I have a bad habit of using idioms). [*] https://dictionary.cambridge.org/us/dictionary/english/set-the-stage-for