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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3C87BC433EF for ; Tue, 15 Mar 2022 09:54:25 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 8A8B049F26; Tue, 15 Mar 2022 05:54:24 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@redhat.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 57uYL-Iofusx; Tue, 15 Mar 2022 05:54:23 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 6898B49F27; Tue, 15 Mar 2022 05:54:23 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 4273C49F13 for ; Tue, 15 Mar 2022 05:54:22 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HH3KdcsdKsKH for ; Tue, 15 Mar 2022 05:54:21 -0400 (EDT) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1D16849EFB for ; Tue, 15 Mar 2022 05:54:21 -0400 (EDT) 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-pj1-f72.google.com (mail-pj1-f72.google.com [209.85.216.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-126-DxWtAmFPOWGrox9-YVqTyQ-1; Tue, 15 Mar 2022 05:54:19 -0400 X-MC-Unique: DxWtAmFPOWGrox9-YVqTyQ-1 Received: by mail-pj1-f72.google.com with SMTP id md4-20020a17090b23c400b001bf675ff745so1676292pjb.3 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=p3ZtjFYfOJyFkmDmWwLLZgeL/v85iHOJOJ3pE9BrlPRXRMEdAGNVzbSLdIlj2KzGpC Qx41hQSmmsrVmTd/gN/Ocvg16+xVW1/vdMpijqvKYOkEwjpjeeuijetabarIPRqhsBb9 BO9zIHKyV8/ChG8CINZteOKQLLcmBvaOLsEj6seuRB6uwL5CJ+MxqDAu8MqELPB1QsAO 7v9F4S9yQiit+hcPWnpQyMxDc+Igct7VaiUZOWusaRkkgoKw5I6Q9ANz3HU+jH0hbY10 DbhW1j0ULv6yBlb2o7NderjUHyVAU0G6O8yOW1wJ3tUlaUW65S6mYPCzy8zcLgUgYlQK 45NA== X-Gm-Message-State: AOAM530mAVqy+xqZw/23yruh1nNSLMsEDweijKwWjCc7qRzn89Y7eiZC 3CXFTp+1LiFG+j8IiZA1KETJuPps69XovrQjgAS/dLGIOTqE9EwtTswOy45wFe0mBTwAjLQdk6P kDi89CRGigtBE1fFB/Qi/+geg X-Received: by 2002:a63:6a87:0:b0:37c:917a:9ce8 with SMTP id f129-20020a636a87000000b0037c917a9ce8mr23252016pgc.373.1647338058391; 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 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 In-Reply-To: <20220311002528.2230172-8-dmatlack@google.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=peterx@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: Marc Zyngier , Albert Ou , "open list:KERNEL VIRTUAL MACHINE FOR MIPS \(KVM/mips\)" , Huacai Chen , "open list:KERNEL VIRTUAL MACHINE FOR MIPS \(KVM/mips\)" , Aleksandar Markovic , Palmer Dabbelt , "open list:KERNEL VIRTUAL MACHINE FOR RISC-V \(KVM/riscv\)" , Paul Walmsley , Ben Gardon , Paolo Bonzini , maciej.szmigiero@oracle.com, "moderated list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)" , Peter Feiner X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu 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 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm