From patchwork Fri Apr 22 21:05:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Matlack X-Patchwork-Id: 12824145 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 F1DB3C433EF for ; Fri, 22 Apr 2022 22:13:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232065AbiDVWQ0 (ORCPT ); Fri, 22 Apr 2022 18:16:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232049AbiDVWPg (ORCPT ); Fri, 22 Apr 2022 18:15:36 -0400 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDED731A14C for ; Fri, 22 Apr 2022 14:06:04 -0700 (PDT) Received: by mail-pf1-x44a.google.com with SMTP id g23-20020aa78197000000b0050adbdbbec8so4248353pfi.23 for ; Fri, 22 Apr 2022 14:06:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=eu8VJbJguY6ZXLXdguLoPmTx5E277sRGDrrNJcFdDls=; b=mm+KqjDQ8J0VSRw/QbSRolONpDUykCEYi89d8db8fl+iMViZR8v5A2X+QebpfJFc6B C8OURrG9LEQ4a3Wytvf4Ke9Q4CLrkDEndf5ycAdjvcdDkpbRxN0Yl+KrHS7izEFDlTwz c60cSQk5zb2UrX23tjZkqU3oH6gqEVS09yNyvaqqAH1hcARFFV1SltSJ/hCHEk8urLQl aRxdC99NmJrI6wfB5XGr20cRyUEx0oF3aql6vDmSs5mcnQ4VKFMevlqhMefHONh7+Oxk PfA3mhq70dtJJldDxC9vfyjDn822V20AWlkPT4ytIG7T7bQaaHlOPvaTeK89XHUFktN4 Evtw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=eu8VJbJguY6ZXLXdguLoPmTx5E277sRGDrrNJcFdDls=; b=tY7LXp33I9t/2Kfb2h/iju477xLqR2Cng2ccjFefYIJCOvo7zawUKu3Ch//r51kpdF lcBN1uMFzSay4Q94Zoth86NCNjB/KoXBk2AIdCPfhk95HPw83+5lENA2JGM7bnz9uzoe Xw614UVQjCyucUR6DxnvMB/kGa6KOHbGh4oB3isEuV/oKg/l7IfGuM8ZF8m91aQoKrUh xMC7fyCGqhz7eTLivn8JBeHBgkU4Sm7svxrJzIO0hs94agikrdjUMIv71i2+zfmdb9vi QEZcraAiJ43oCgUa7imkDoVIrTKzA87U9qmV/FDOCjtRiOMGoSR+D/rxBGw8IAgkbfHv 0CwQ== X-Gm-Message-State: AOAM533aGop8aU139p6h36FpU1iMZNRAeu9PfojfT0xvuDdxpHPYoCli vGeGO7DXkJmEaw4dMFyxZOyRxQb2NQA0sw== X-Google-Smtp-Source: ABdhPJzGn8bnFbc/Hfs0LpuWfl2EI/jAUqlaxIL7OMkYkvAkhScJ3fiquDkJMS7/S7081qV96um484xUT08c2g== X-Received: from dmatlack-heavy.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:19cd]) (user=dmatlack job=sendgmr) by 2002:a17:902:e803:b0:15c:e281:de8f with SMTP id u3-20020a170902e80300b0015ce281de8fmr838250plg.13.1650661564401; Fri, 22 Apr 2022 14:06:04 -0700 (PDT) Date: Fri, 22 Apr 2022 21:05:36 +0000 In-Reply-To: <20220422210546.458943-1-dmatlack@google.com> Message-Id: <20220422210546.458943-11-dmatlack@google.com> Mime-Version: 1.0 References: <20220422210546.458943-1-dmatlack@google.com> X-Mailer: git-send-email 2.36.0.rc2.479.g8af0fa9b8e-goog Subject: [PATCH v4 10/20] KVM: x86/mmu: Pass kvm pointer separately from vcpu to kvm_mmu_find_shadow_page() From: David Matlack To: Paolo Bonzini Cc: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , Andrew Jones , Ben Gardon , Peter Xu , 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 , David Matlack Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Get the kvm pointer from the caller, rather than deriving it from vcpu->kvm, and plumb the kvm pointer all the way from kvm_mmu_get_shadow_page(). With this change in place, the vcpu pointer is only needed to sync indirect shadow pages. In other words, __kvm_mmu_get_shadow_page() can now be used to get *direct* shadow pages without a vcpu pointer. This enables eager page splitting, which needs to allocate direct shadow pages during VM ioctls. No functional change intended. Signed-off-by: David Matlack --- arch/x86/kvm/mmu/mmu.c | 28 +++++++++++++++------------- 1 file changed, 15 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index df110e0d57cf..04029c01aebd 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -2003,7 +2003,8 @@ static void clear_sp_write_flooding_count(u64 *spte) __clear_sp_write_flooding_count(sptep_to_sp(spte)); } -static struct kvm_mmu_page *kvm_mmu_find_shadow_page(struct kvm_vcpu *vcpu, +static struct kvm_mmu_page *kvm_mmu_find_shadow_page(struct kvm *kvm, + struct kvm_vcpu *vcpu, gfn_t gfn, struct hlist_head *sp_list, union kvm_mmu_page_role role) @@ -2013,7 +2014,7 @@ static struct kvm_mmu_page *kvm_mmu_find_shadow_page(struct kvm_vcpu *vcpu, int collisions = 0; LIST_HEAD(invalid_list); - for_each_valid_sp(vcpu->kvm, sp, sp_list) { + for_each_valid_sp(kvm, sp, sp_list) { if (sp->gfn != gfn) { collisions++; continue; @@ -2030,7 +2031,7 @@ static struct kvm_mmu_page *kvm_mmu_find_shadow_page(struct kvm_vcpu *vcpu, * upper-level page will be write-protected. */ if (role.level > PG_LEVEL_4K && sp->unsync) - kvm_mmu_prepare_zap_page(vcpu->kvm, sp, + kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); continue; } @@ -2058,7 +2059,7 @@ static struct kvm_mmu_page *kvm_mmu_find_shadow_page(struct kvm_vcpu *vcpu, WARN_ON(!list_empty(&invalid_list)); if (ret > 0) - kvm_flush_remote_tlbs(vcpu->kvm); + kvm_flush_remote_tlbs(kvm); } __clear_sp_write_flooding_count(sp); @@ -2067,13 +2068,13 @@ static struct kvm_mmu_page *kvm_mmu_find_shadow_page(struct kvm_vcpu *vcpu, } sp = NULL; - ++vcpu->kvm->stat.mmu_cache_miss; + ++kvm->stat.mmu_cache_miss; out: - kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); + kvm_mmu_commit_zap_page(kvm, &invalid_list); - if (collisions > vcpu->kvm->stat.max_mmu_page_hash_collisions) - vcpu->kvm->stat.max_mmu_page_hash_collisions = collisions; + if (collisions > kvm->stat.max_mmu_page_hash_collisions) + kvm->stat.max_mmu_page_hash_collisions = collisions; return sp; } @@ -2118,7 +2119,8 @@ static struct kvm_mmu_page *kvm_mmu_alloc_shadow_page(struct kvm *kvm, return sp; } -static struct kvm_mmu_page *__kvm_mmu_get_shadow_page(struct kvm_vcpu *vcpu, +static struct kvm_mmu_page *__kvm_mmu_get_shadow_page(struct kvm *kvm, + struct kvm_vcpu *vcpu, struct shadow_page_caches *caches, gfn_t gfn, union kvm_mmu_page_role role) @@ -2127,12 +2129,12 @@ static struct kvm_mmu_page *__kvm_mmu_get_shadow_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp; bool created = false; - sp_list = &vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]; + sp_list = &kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]; - sp = kvm_mmu_find_shadow_page(vcpu, gfn, sp_list, role); + sp = kvm_mmu_find_shadow_page(kvm, vcpu, gfn, sp_list, role); if (!sp) { created = true; - sp = kvm_mmu_alloc_shadow_page(vcpu->kvm, caches, gfn, sp_list, role); + sp = kvm_mmu_alloc_shadow_page(kvm, caches, gfn, sp_list, role); } trace_kvm_mmu_get_page(sp, created); @@ -2149,7 +2151,7 @@ static struct kvm_mmu_page *kvm_mmu_get_shadow_page(struct kvm_vcpu *vcpu, .gfn_array_cache = &vcpu->arch.mmu_gfn_array_cache, }; - return __kvm_mmu_get_shadow_page(vcpu, &caches, gfn, role); + return __kvm_mmu_get_shadow_page(vcpu->kvm, vcpu, &caches, gfn, role); } static union kvm_mmu_page_role kvm_mmu_child_role(u64 *sptep, bool direct, u32 access)