From nobody Thu Feb 12 17:27:26 2026 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00CA81859 for ; Tue, 11 Jun 2024 00:22:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718065328; cv=none; b=nrRv91iH9pkK+w8Thojs3VDbtZVhnYCgz4ZE42jSH+s7H51jLdBLsVaZaW3vTMGhL6SNRKvMQYh6Ji812fj4OvqgjZU6rkOXygwvCR2SEwlcwveqN4npiiGvapVCza40bvREJV9dzsZoAHqsU7rkWyZpGLX2TKcgupIPKZhc7ig= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718065328; c=relaxed/simple; bh=TLFRX+aqWmviYS3ujVoFIt3OR1s8HN7oRYUrNpwybnQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Elv3o2ijhydD8ErlwE5OZty/C4B4xR50VIeyASOtXzGultKZJmsHRaON+psqryXsrs7DWU4v+tJcYhnGj0GhkTvjqZkt3x7WAQUKjP4F5v8238EloYE2b+JyjqbGVGqCrfg3cyc7fXC5VNeatbGP/odCU9qFt3I3XCN97/QaYi0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jthoughton.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=TZjEK4WZ; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jthoughton.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="TZjEK4WZ" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-62ca03fc1ceso9705887b3.1 for ; Mon, 10 Jun 2024 17:22:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1718065325; x=1718670125; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=jRq1E0P4aXnPxzizQoW47AD5YHVJpyUxzEyvFYZC4Cg=; b=TZjEK4WZwZ76giyek/t3eOXFi+uTvRozz66gAy0/6tplI1prNKfNY+9srtusq1Qnfi 7yHnN8Kcony3GRhEb36lxiNA0dbz8t0SzLM89zGHxAk+c0gcani93hNDC9jec5Gc1cjE am0jgkEGtfnUAn4grOC5X+DAPasQyOh+NUvLXfu+RtwVYGjlGPHkXjUSnsxh/Oo1Hl5w Uc9XvcQTl8NDjmuURlhezE0iC0s9TKyasXpiAJERxsD1Lkv4phQ4dYsDDR3dMSFuK825 UOneVzphlQsFSh2ZcFRSP+L7OrpeWeXo2LfRssAR+j2AshUchDiDMsrivfsnt7B8MfS9 874g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718065325; x=1718670125; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=jRq1E0P4aXnPxzizQoW47AD5YHVJpyUxzEyvFYZC4Cg=; b=WuWKKvderwbmZC0CP8VYFg1Bhzx2fXRuCNPi1b+ZVw3iNWpBHkGjrtjUnJs6u5udX3 gCEX6OLJfclb5OKVUb5adVCIdH5svRxtTA6uuryBTvTIo4wnhJZksYIWGqRto302ZyvT ZiUH3ZAd/T9ZxNjqgf0XsOKROr4XG/5WkWe88UJ7tJ3LhkWPw/o29lB4i8SYvYydua9h SEFlTZwj33ZSTToHwbF6l0hj373P9IOimg3iQLUDTT4YxG5KP1b2/LZpXTO5zYf78JKK XsPUywPeD3hLme/+a3PJrNXE1+2SPUCdl+kZsdDVxn5ewJ6jpZk2wRaa/3Qz6B4rC/v7 uuTA== X-Forwarded-Encrypted: i=1; AJvYcCWrGrzHl35klCnOANCckJJkNjD+DjmvE6H2NpRZfX4EJ7x/NH4da2KTau/qS0MZF+K0t63cqp2iDAnbYzNUXrt0H4RG4OSd7qETUdw0 X-Gm-Message-State: AOJu0YwJcF9aO7y9NkNYQLaTQwkuEEony3LjtBpB9mgRjKie8DWvpbDy RrWi05vi2b9/qIolSYPCgYVublNr9jlpoB7cIbIxZ/zU8c4ftljwWgSbnGsYbwO+L41qi0XqYxp ahXmcGwuTTw3+Yoirgg== X-Google-Smtp-Source: AGHT+IFmXdVsVq2jHeT0x/0hUnfSFWa7WYtFFT8Isj0HD4sG8F4BOnOmk4JS+KLDOFafX3S7G6SXbQD7sfuchknU X-Received: from jthoughton.c.googlers.com ([fda3:e722:ac3:cc00:14:4d90:c0a8:2a4f]) (user=jthoughton job=sendgmr) by 2002:a05:690c:fca:b0:62c:fa1a:21d2 with SMTP id 00721157ae682-62cfa1a282cmr21119147b3.1.1718065324978; Mon, 10 Jun 2024 17:22:04 -0700 (PDT) Date: Tue, 11 Jun 2024 00:21:43 +0000 In-Reply-To: <20240611002145.2078921-1-jthoughton@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240611002145.2078921-1-jthoughton@google.com> X-Mailer: git-send-email 2.45.2.505.gda0bf45e8d-goog Message-ID: <20240611002145.2078921-8-jthoughton@google.com> Subject: [PATCH v5 7/9] KVM: x86: Implement kvm_fast_test_age_gfn and kvm_fast_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 , 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 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The fast-only notifier will only report an accurate result when the shadow MMU is not in use. Implement kvm_arch_young_notifier_likely_fast(), as MGLRU will check this function to see if it should even be attempting the fast-only notifier. We only want to attempt the notifier if there is a chance that it will succeed (i.e., that we're using the TDP MMU). Signed-off-by: James Houghton --- arch/x86/include/asm/kvm_host.h | 7 +++++ arch/x86/kvm/Kconfig | 1 + arch/x86/kvm/mmu/mmu.c | 50 ++++++++++++++++++++++++++++++--- 3 files changed, 54 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_hos= t.h index 0dc1fa99cdbb..ca2fbc162e51 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -2338,4 +2338,11 @@ int memslot_rmap_alloc(struct kvm_memory_slot *slot,= unsigned long npages); */ #define KVM_EXIT_HYPERCALL_MBZ GENMASK_ULL(31, 1) =20 +#define kvm_arch_young_notifier_likely_fast kvm_arch_young_notifier_likely= _fast +static inline bool kvm_arch_young_notifier_likely_fast(void) +{ + return IS_ENABLED(CONFIG_X86_64) && tdp_mmu_enabled && + shadow_accessed_mask; +} + #endif /* _ASM_X86_KVM_HOST_H */ diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 9dda7f8c72ed..84ae043c7d43 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -24,6 +24,7 @@ config KVM select KVM_COMMON select KVM_GENERIC_MMU_NOTIFIER select KVM_MMU_NOTIFIER_YOUNG_LOCKLESS + select HAVE_KVM_YOUNG_FAST_ONLY_NOTIFIER select HAVE_KVM_IRQCHIP select HAVE_KVM_PFNCACHE select HAVE_KVM_DIRTY_RING_TSO diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 51061f1fb3d1..ed50e78755ab 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1629,11 +1629,15 @@ static void rmap_add(struct kvm_vcpu *vcpu, const s= truct kvm_memory_slot *slot, __rmap_add(vcpu->kvm, cache, slot, spte, gfn, access); } =20 -bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) +static int __kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range, + bool fast_only) { bool young =3D false; =20 if (kvm_memslots_have_rmaps(kvm)) { + if (fast_only) + return -1; + write_lock(&kvm->mmu_lock); young =3D kvm_handle_gfn_range(kvm, range, kvm_age_rmap); write_unlock(&kvm->mmu_lock); @@ -1642,14 +1646,18 @@ bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_ra= nge *range) if (tdp_mmu_enabled) young |=3D kvm_tdp_mmu_age_gfn_range(kvm, range); =20 - return young; + return (int)young; } =20 -bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) +static int __kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range, + bool fast_only) { bool young =3D false; =20 if (kvm_memslots_have_rmaps(kvm)) { + if (fast_only) + return -1; + write_lock(&kvm->mmu_lock); young =3D kvm_handle_gfn_range(kvm, range, kvm_test_age_rmap); write_unlock(&kvm->mmu_lock); @@ -1658,7 +1666,41 @@ bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gf= n_range *range) if (tdp_mmu_enabled) young |=3D kvm_tdp_mmu_test_age_gfn(kvm, range); =20 - return young; + return (int)young; +} + +bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) +{ + return __kvm_age_gfn(kvm, range, false); +} + +bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) +{ + return __kvm_test_age_gfn(kvm, range, false); +} + +bool kvm_fast_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) +{ + int ret =3D __kvm_age_gfn(kvm, range, true); + + if (ret < 0) { + *range->arg.failed =3D true; + return false; + } + + return ret !=3D 0; +} + +bool kvm_fast_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range) +{ + int ret =3D __kvm_test_age_gfn(kvm, range, true); + + if (ret < 0) { + *range->arg.failed =3D true; + return false; + } + + return ret !=3D 0; } =20 static void kvm_mmu_check_sptes_at_free(struct kvm_mmu_page *sp) --=20 2.45.2.505.gda0bf45e8d-goog