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 F421DC6FD19 for ; Sat, 11 Mar 2023 00:25:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231621AbjCKAZg (ORCPT ); Fri, 10 Mar 2023 19:25:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230244AbjCKAYm (ORCPT ); Fri, 10 Mar 2023 19:24:42 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C07FB13FF07 for ; Fri, 10 Mar 2023 16:23:56 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id n139-20020a25d691000000b00b1f2dad8a21so7480250ybg.10 for ; Fri, 10 Mar 2023 16:23:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1678494224; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=N+pTW/7tamt2IbWqj09PuRke2TPGqju0w/Y+Ey0MO8s=; b=TX207gWxU4fl6z+RQW+zgREYFd4cytj/8tZI2zkqObrsMjl10KdJrGM7q7WTP5BOZO DLzQ5VWBQnNxCbVf2+cQfzIXI2zYHKEkWEpr61vTyWUf1I6R86u7aEJttHbobxIZO1Rr wVnaUWJDjIJy9hGRnN9kp5vaAQq8hjOjzD3OwUEvbaSXDsqjfNp+/9yet1+LMyjg+hSH Z9+g65wP4Zbnz/J9mWJkkvJA7OGYRysmwD27lA/eCXxws3+k9tERGBRPk5aJu3/Qu5AP cC1dzmy98Ceg7CX3vuaG00oNgtqXqbPeF9m0P0uprlHmrwBfXlYgWw3L9RzBsjlqF1nF Fqkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678494224; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=N+pTW/7tamt2IbWqj09PuRke2TPGqju0w/Y+Ey0MO8s=; b=XqKENYC6yl+s9tE2EWGfahIYP4zK1Ku7c6MGYPGCLiuwi7ZFL7Iz58v+ZFPnuPwRrV gw6XXx1UD018Z3MHMINMc64fsoUHSDgscfzD8sOFoWQOQ2rNULo5vMI+zKrbqmbTYwoe Ze1Npjco+h381Y/shKcnhLqFzVTPVXXle60c8QPQg9u1WUJ6IxBcStprRDflMZX+UpB5 eiKX6wY8ZGokVYXHBSXTyIEw8yB54v9IjgYAKXJeYjmAw9hLsGgvQoR/Y3mUizPBXBRl cVZHlT9M3ylrAbECQ8+72fBrjrqq6sjHF9Fy2ZYx613b0D8QekbRemqMu4/DCeF+8cls Fsbg== X-Gm-Message-State: AO0yUKW7LCHCHtN1f9ElzuVix7PAogtVlq4727yfG7uf1J5VeFq/XvW2 tTofYyauFqIOg8AUOw39E8O124dvSEg= X-Google-Smtp-Source: AK7set+PhmN8Vt5Sg9+9k+BbkcNTAAL0L3IO4DJekk9kppHHOYe5KBYbxmQ3nKmARwfzkGtntaBVjMChv4E= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a5b:c0b:0:b0:80b:4f92:1623 with SMTP id f11-20020a5b0c0b000000b0080b4f921623mr9ybq.370.1678494223739; Fri, 10 Mar 2023 16:23:43 -0800 (PST) Reply-To: Sean Christopherson Date: Fri, 10 Mar 2023 16:22:51 -0800 In-Reply-To: <20230311002258.852397-1-seanjc@google.com> Mime-Version: 1.0 References: <20230311002258.852397-1-seanjc@google.com> X-Mailer: git-send-email 2.40.0.rc1.284.g88254d51c5-goog Message-ID: <20230311002258.852397-21-seanjc@google.com> Subject: [PATCH v2 20/27] KVM: x86/mmu: Use page-track notifiers iff there are external users From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini , Zhenyu Wang , Zhi Wang Cc: kvm@vger.kernel.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, Yan Zhao , Ben Gardon Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Disable the page-track notifier code at compile time if there are no external users, i.e. if CONFIG_KVM_EXTERNAL_WRITE_TRACKING=n. KVM itself now hooks emulated writes directly instead of relying on the page-track mechanism. Signed-off-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/include/asm/kvm_page_track.h | 2 ++ arch/x86/kvm/mmu/page_track.c | 9 ++++----- arch/x86/kvm/mmu/page_track.h | 29 +++++++++++++++++++++++---- 4 files changed, 33 insertions(+), 9 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 1a4225237564..a3423711e403 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1265,7 +1265,9 @@ struct kvm_arch { * create an NX huge page (without hanging the guest). */ struct list_head possible_nx_huge_pages; +#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING struct kvm_page_track_notifier_head track_notifier_head; +#endif /* * Protects marking pages unsync during page faults, as TDP MMU page * faults only take mmu_lock for read. For simplicity, the unsync diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h index deece45936a5..53c2adb25a07 100644 --- a/arch/x86/include/asm/kvm_page_track.h +++ b/arch/x86/include/asm/kvm_page_track.h @@ -55,6 +55,7 @@ void kvm_slot_page_track_remove_page(struct kvm *kvm, struct kvm_memory_slot *slot, gfn_t gfn, enum kvm_page_track_mode mode); +#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING enum pg_level kvm_page_track_max_mapping_level(struct kvm *kvm, gfn_t gfn, enum pg_level max_level); @@ -64,5 +65,6 @@ kvm_page_track_register_notifier(struct kvm *kvm, void kvm_page_track_unregister_notifier(struct kvm *kvm, struct kvm_page_track_notifier_node *n); +#endif /* CONFIG_KVM_EXTERNAL_WRITE_TRACKING */ #endif diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c index a21200df515d..619ec8e5fd32 100644 --- a/arch/x86/kvm/mmu/page_track.c +++ b/arch/x86/kvm/mmu/page_track.c @@ -194,6 +194,7 @@ bool kvm_slot_page_track_is_active(struct kvm *kvm, return !!READ_ONCE(slot->arch.gfn_track[mode][index]); } +#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING void kvm_page_track_cleanup(struct kvm *kvm) { struct kvm_page_track_notifier_head *head; @@ -255,14 +256,13 @@ EXPORT_SYMBOL_GPL(kvm_page_track_unregister_notifier); * The node should figure out if the written page is the one that node is * interested in by itself. */ -void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, - int bytes) +void __kvm_page_track_write(struct kvm *kvm, gpa_t gpa, const u8 *new, int bytes) { struct kvm_page_track_notifier_head *head; struct kvm_page_track_notifier_node *n; int idx; - head = &vcpu->kvm->arch.track_notifier_head; + head = &kvm->arch.track_notifier_head; if (hlist_empty(&head->track_notifier_list)) return; @@ -273,8 +273,6 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, if (n->track_write) n->track_write(gpa, new, bytes, n); srcu_read_unlock(&head->track_srcu, idx); - - kvm_mmu_track_write(vcpu, gpa, new, bytes); } /* @@ -317,3 +315,4 @@ enum pg_level kvm_page_track_max_mapping_level(struct kvm *kvm, gfn_t gfn, return max_level; } EXPORT_SYMBOL_GPL(kvm_page_track_max_mapping_level); +#endif diff --git a/arch/x86/kvm/mmu/page_track.h b/arch/x86/kvm/mmu/page_track.h index 89712f123ad3..931b26b8fc8f 100644 --- a/arch/x86/kvm/mmu/page_track.h +++ b/arch/x86/kvm/mmu/page_track.h @@ -6,8 +6,6 @@ #include -int kvm_page_track_init(struct kvm *kvm); -void kvm_page_track_cleanup(struct kvm *kvm); bool kvm_page_track_write_tracking_enabled(struct kvm *kvm); int kvm_page_track_write_tracking_alloc(struct kvm_memory_slot *slot); @@ -21,13 +19,36 @@ bool kvm_slot_page_track_is_active(struct kvm *kvm, const struct kvm_memory_slot *slot, gfn_t gfn, enum kvm_page_track_mode mode); -void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, - int bytes); +#ifdef CONFIG_KVM_EXTERNAL_WRITE_TRACKING +int kvm_page_track_init(struct kvm *kvm); +void kvm_page_track_cleanup(struct kvm *kvm); + +void __kvm_page_track_write(struct kvm *kvm, gpa_t gpa, const u8 *new, int bytes); void kvm_page_track_delete_slot(struct kvm *kvm, struct kvm_memory_slot *slot); static inline bool kvm_page_track_has_external_user(struct kvm *kvm) { return hlist_empty(&kvm->arch.track_notifier_head.track_notifier_list); } +#else +static inline int kvm_page_track_init(struct kvm *kvm) { return 0; } +static inline void kvm_page_track_cleanup(struct kvm *kvm) { } + +static inline void __kvm_page_track_write(struct kvm *kvm, gpa_t gpa, + const u8 *new, int bytes) { } +static inline void kvm_page_track_delete_slot(struct kvm *kvm, + struct kvm_memory_slot *slot) { } + +static inline bool kvm_page_track_has_external_user(struct kvm *kvm) { return false; } + +#endif /* CONFIG_KVM_EXTERNAL_WRITE_TRACKING */ + +static inline void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, + const u8 *new, int bytes) +{ + __kvm_page_track_write(vcpu->kvm, gpa, new, bytes); + + kvm_mmu_track_write(vcpu, gpa, new, bytes); +} #endif /* __KVM_X86_PAGE_TRACK_H */ -- 2.40.0.rc1.284.g88254d51c5-goog