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 742D0C433EF for ; Tue, 15 Mar 2022 09:54:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245460AbiCOJzg (ORCPT ); Tue, 15 Mar 2022 05:55:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343563AbiCOJzf (ORCPT ); Tue, 15 Mar 2022 05:55:35 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id A8742BED for ; Tue, 15 Mar 2022 02:54:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647338060; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Xo7vEvs61DjOwm+OclljyKsVMA7zeYl4GrMr0rJ3aPA=; b=FAFXlZAgGmK5NvWaqs3uMxKqjDh40qjEPm+E8EsYxtST+nGSQ/KUh6Y5qDFAPXOMN7HcjK I3Htf5aLBUPi3heVoeYU4zRdIPjS6HmlB0lhLR8LmPxewmICpBd9y1+F1JM1N4zTHPmmFS 6jdk1S4HoYr8Nr5wJQjmsnYJPZ1SexE= Received: from mail-pl1-f199.google.com (mail-pl1-f199.google.com [209.85.214.199]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-126-sczn1gJjNciDdlhkHmLwcA-1; Tue, 15 Mar 2022 05:54:19 -0400 X-MC-Unique: sczn1gJjNciDdlhkHmLwcA-1 Received: by mail-pl1-f199.google.com with SMTP id j1-20020a170903028100b0014b1f9e0068so8088556plr.8 for ; Tue, 15 Mar 2022 02:54:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Xo7vEvs61DjOwm+OclljyKsVMA7zeYl4GrMr0rJ3aPA=; b=FDhdUPkMby2eCWqgg2FValndl2OEhSqcR0HdBMryAqTB4Ehxn2pk7IQcC/5nS+/35S 60OUmsRzijL5aDFmWQrusexALI0EHzaUttNUd3WYbu3rx/fZwjhzSUyhAJtVsqgJUCKP aqn6Qh6BrcgzZNv+eT95FymkiWDmlAP1rgiq1z/p7BlxaoFKr8HdnWWNwjmmzoLeb05u NipNBtxG+9yBh+URzV5juHytTri7psQabsPZqWx/CWpI9xeVG+I8ay9AfN1SC5uz53c9 ySd8dLMKekomytN9TFXbhZTSNKSP+/o4G68x/sKc1ECnzUneUH8CcoFUlQZ+ML6zSjEc gcAg== X-Gm-Message-State: AOAM531pLHL7CMrGsohj1Lpefdb8/HgTiTaygaNayj0jkJAciD+bgALN Yl/+idYTXmnUdV1NkNpFFzh2Z+09vER+0JCEUTYZ/P7j1TjxIaN1kzxyrAa+xojHdSUAs0d3jzy n+f6xMfMU0E2o X-Received: by 2002:a63:6a87:0:b0:37c:917a:9ce8 with SMTP id f129-20020a636a87000000b0037c917a9ce8mr23251998pgc.373.1647338058329; Tue, 15 Mar 2022 02:54:18 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxk6toqw8g9xhAX2SCrS3+aOdMM5AnKaYY+MCoYdIf9gIGOszMtcDKZxExIC2OWuD0eFQebMA== X-Received: by 2002:a63:6a87:0:b0:37c:917a:9ce8 with SMTP id f129-20020a636a87000000b0037c917a9ce8mr23251985pgc.373.1647338057995; Tue, 15 Mar 2022 02:54:17 -0700 (PDT) Received: from xz-m1.local ([191.101.132.43]) by smtp.gmail.com with ESMTPSA id b5-20020a056a000cc500b004f6ff0f51f4sm23591315pfv.5.2022.03.15.02.54.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Mar 2022 02:54:17 -0700 (PDT) Date: Tue, 15 Mar 2022 17:54:09 +0800 From: Peter Xu To: David Matlack Cc: Paolo Bonzini , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , Andrew Jones , Ben Gardon , maciej.szmigiero@oracle.com, "moderated list:KERNEL VIRTUAL MACHINE FOR ARM64 (KVM/arm64)" , "open list:KERNEL VIRTUAL MACHINE FOR MIPS (KVM/mips)" , "open list:KERNEL VIRTUAL MACHINE FOR MIPS (KVM/mips)" , "open list:KERNEL VIRTUAL MACHINE FOR RISC-V (KVM/riscv)" , Peter Feiner Subject: Re: [PATCH v2 07/26] KVM: x86/mmu: Separate shadow MMU sp allocation from initialization Message-ID: References: <20220311002528.2230172-1-dmatlack@google.com> <20220311002528.2230172-8-dmatlack@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20220311002528.2230172-8-dmatlack@google.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Fri, Mar 11, 2022 at 12:25:09AM +0000, David Matlack wrote: > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c > index 519910938478..e866e05c4ba5 100644 > --- a/arch/x86/kvm/mmu/mmu.c > +++ b/arch/x86/kvm/mmu/mmu.c > @@ -1716,16 +1716,9 @@ static struct kvm_mmu_page *kvm_mmu_alloc_shadow_page(struct kvm_vcpu *vcpu, > sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache); > if (!direct) > sp->gfns = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_gfn_array_cache); > + > set_page_private(virt_to_page(sp->spt), (unsigned long)sp); Trivial nit: I read Ben's comment in previous version and that sounds reasonable to keep the two linkages together. It's just a bit of a pity we need to set the private manually for each allocation. Meanwhile we have another counter example in the tdp mmu code (tdp_mmu_init_sp()), so we may want to align the tdp/shadow cases at some point.. -- Peter Xu