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AJvYcCWW2kQSTqBW5W+f32u2VaHrn13nHYQY77QqBNblDi78zQNUWrUoKGSQe74bveu8k/s4HnEp5hkxVnu54uahtHVxlULz X-Gm-Message-State: AOJu0Ywo44Dbt2fNI3+v4pg6dQLwFT+U67yKDy7ZhzD0IyAheclD9Swu GPkiq3XLj54mAtHWaQi/4hWnLnxGIFZpZNsadvDv3SDLGux9xtJiFbZe9ct6AA/prS75JYWTp+A w/jmuudQD2I+f+pnjCg== X-Google-Smtp-Source: AGHT+IEN/Y2KcEHN/92i673drFtDbgqlQb3JUSQlrIWx5MUp4ovVZHssNawTpvQt6yIfvMN/stHEpv668SrbKdDV X-Received: from jthoughton.c.googlers.com ([fda3:e722:ac3:cc00:14:4d90:c0a8:2a4f]) (user=jthoughton job=sendgmr) by 2002:a05:690c:289:b0:630:28e3:2568 with SMTP id 00721157ae682-671f1095e3fmr479257b3.3.1721783479490; Tue, 23 Jul 2024 18:11:19 -0700 (PDT) Date: Wed, 24 Jul 2024 01:10:32 +0000 In-Reply-To: <20240724011037.3671523-1-jthoughton@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240724011037.3671523-1-jthoughton@google.com> X-Mailer: git-send-email 2.46.0.rc1.232.g9752f9e123-goog Message-ID: <20240724011037.3671523-8-jthoughton@google.com> Subject: [PATCH v6 07/11] KVM: Pass fast_only to kvm_{test_,}age_gfn From: James Houghton To: Andrew Morton , Paolo Bonzini Cc: Ankit Agrawal , Axel Rasmussen , Catalin Marinas , David Matlack , David Rientjes , James Houghton , James Morse , Jason Gunthorpe , Jonathan Corbet , Marc Zyngier , Oliver Upton , Raghavendra Rao Ananta , Ryan Roberts , Sean Christopherson , Shaoqin Huang , Suzuki K Poulose , Wei Xu , Will Deacon , Yu Zhao , Zenghui Yu , kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Provide the basics for architectures to implement a fast-only version of kvm_{test_,}age_gfn. Add CONFIG_HAVE_KVM_MMU_NOTIFIER_YOUNG_FAST_ONLY that architectures will set if they non-trivially implement test_young() and clear_young() when called with fast_only. Signed-off-by: James Houghton --- include/linux/kvm_host.h | 1 + virt/kvm/Kconfig | 4 ++++ virt/kvm/kvm_main.c | 37 +++++++++++++++++++++---------------- 3 files changed, 26 insertions(+), 16 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 8cd80f969cff..944c5fba2344 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -258,6 +258,7 @@ int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu); #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER union kvm_mmu_notifier_arg { unsigned long attributes; + bool fast_only; }; struct kvm_gfn_range { diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 632334861001..cb4d5384c2f2 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -103,6 +103,10 @@ config KVM_GENERIC_MMU_NOTIFIER config KVM_MMU_NOTIFIER_YOUNG_LOCKLESS bool +config HAVE_KVM_MMU_NOTIFIER_YOUNG_FAST_ONLY + select KVM_GENERIC_MMU_NOTIFIER + bool + config KVM_GENERIC_MEMORY_ATTRIBUTES depends on KVM_GENERIC_MMU_NOTIFIER bool diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 959b6d5d8ce4..86fb2b560d98 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -697,18 +697,20 @@ static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn, static __always_inline int kvm_handle_hva_range_no_flush(struct mmu_notifier *mn, unsigned long start, unsigned long end, - gfn_handler_t handler) + gfn_handler_t handler, + bool fast_only) { struct kvm *kvm = mmu_notifier_to_kvm(mn); const struct kvm_mmu_notifier_range range = { - .start = start, - .end = end, - .handler = handler, - .on_lock = (void *)kvm_null_fn, - .flush_on_ret = false, - .may_block = false, - .lockless = + .start = start, + .end = end, + .handler = handler, + .on_lock = (void *)kvm_null_fn, + .flush_on_ret = false, + .may_block = false, + .lockless = IS_ENABLED(CONFIG_KVM_MMU_NOTIFIER_YOUNG_LOCKLESS), + .arg.fast_only = fast_only, }; return __kvm_handle_hva_range(kvm, &range).ret; @@ -900,7 +902,8 @@ static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, * cadence. If we find this inaccurate, we might come up with a * more sophisticated heuristic later. */ - return kvm_handle_hva_range_no_flush(mn, start, end, kvm_age_gfn); + return kvm_handle_hva_range_no_flush(mn, start, end, kvm_age_gfn, + fast_only); } static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, @@ -911,7 +914,7 @@ static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, trace_kvm_test_age_hva(address, fast_only); return kvm_handle_hva_range_no_flush(mn, address, address + 1, - kvm_test_age_gfn); + kvm_test_age_gfn, fast_only); } static void kvm_mmu_notifier_release(struct mmu_notifier *mn, @@ -926,17 +929,19 @@ static void kvm_mmu_notifier_release(struct mmu_notifier *mn, } static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { - .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, - .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, - .clear_flush_young = kvm_mmu_notifier_clear_flush_young, - .clear_young = kvm_mmu_notifier_clear_young, - .test_young = kvm_mmu_notifier_test_young, - .release = kvm_mmu_notifier_release, + .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, + .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, + .clear_flush_young = kvm_mmu_notifier_clear_flush_young, + .clear_young = kvm_mmu_notifier_clear_young, + .test_young = kvm_mmu_notifier_test_young, + .release = kvm_mmu_notifier_release, }; static int kvm_init_mmu_notifier(struct kvm *kvm) { kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; + kvm->mmu_notifier.has_fast_aging = + IS_ENABLED(CONFIG_HAVE_KVM_MMU_NOTIFIER_YOUNG_FAST_ONLY); return mmu_notifier_register(&kvm->mmu_notifier, current->mm); }