Message ID | 20240726235234.228822-70-seanjc@google.com |
---|---|
State | New |
Headers | show
Return-Path: <kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org> X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=j8ALGjRh; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256 header.s=20230601 header.b=c2EmoLdn; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2607:7c80:54:3::133; helo=bombadil.infradead.org; envelope-from=kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=patchwork.ozlabs.org) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4WW58C19n9z1ybY for <incoming@patchwork.ozlabs.org>; Sat, 27 Jul 2024 10:28:43 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:Message-ID :References:Mime-Version:In-Reply-To:Date:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=8JPKnYduKLBBX7U9pkNC8pTulhhi8kSNdDfm0C/u8ls=; b=j8ALGjRhpmr3F1 FIkeIznsOQTNyXj67i3HUeJCf+c3a5EozMWfalFlysbWEWnArsiGUvz03O7nBiS+QLhpFe9sozhwB Xnz+g1w+C5K5TrQOZTXFRC/dtgMKrAOkuFM2yKHRV/70thzJwqUJlV3oAXBXb0w0nSSvt9x4LwtDw 3Cyb+L/N6IS8rEgDiMOVJiTfuL8oPHxv/ZUUt8lymYMphbAjuEcL14pwk6UCY3sihlhH2UYdZn/nm 1cOazPYUw5x6mGXL4IY2dMFvEyQYgsywXIDdPE69GBBtGC55klrwkIGGV0tZn4KZOJyq3v5/yzv// Kwn6SncADhTJZifdxTFQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sXVIe-00000005i1e-11RE; Sat, 27 Jul 2024 00:28:40 +0000 Received: from mail-yb1-xb4a.google.com ([2607:f8b0:4864:20::b4a]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sXUm7-00000005R5l-0trz for kvm-riscv@lists.infradead.org; Fri, 26 Jul 2024 23:55:06 +0000 Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-dc691f1f83aso140426276.1 for <kvm-riscv@lists.infradead.org>; Fri, 26 Jul 2024 16:55:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1722038102; x=1722642902; darn=lists.infradead.org; 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=xPTfQtMbnGzpFXQRYDpT9MKKQAxP5DVy80mpAp/3DnI=; b=c2EmoLdn6qWUnwkOI6Es5Bckdmi+xotmqTg2HTzLZNNNX8PcxIrfx3F3x3Gg2ZMiMg mhj5TJzavZrgCw7PYLzcxEl83nISxS5/HJfs9HRJck6YuxX2YgvNczqNrU1gLvQbGEHh HQHxrzXAfGeo84l/fs0VIAl4E+qbKlrHHj3s6vnooQ+9m/TKG7aieSPgRSsP5m4ZLdtI fD04ZHLyN8HK8R3tu9EYmBj+mIgxQ5dmpnQ+jAALXe96+m9nNUfD1+zgyx91K5BQd0pU z2ZrtNQP7fxu8DWnlG4RvMXgBtgMN0xzUn9bkjJW9/079rCv1BT4EP5tZArWL+Mbwhf+ GcLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722038102; x=1722642902; 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=xPTfQtMbnGzpFXQRYDpT9MKKQAxP5DVy80mpAp/3DnI=; b=L82rtJH1szt4+OeBxQmdG43b8kgyeVvAg1ntDZQ7GhHZ0UYSyBQlXrYEanG+nsycm0 k4CC7/MKHxprEYmhlw0SbClBC4oJg9u6gYFF1/BhEQ/AVMFXi/qXk7F24DV11sJ0CIAa jClvxoCtq2cmXJCUSbA2RcU2ydEN2HP/TiuCrY9vdxAHIm/iWkMnMKnK312QfJ0EAa2I JfwMGPdeW/kw56nMwpWNIADyRJeSGAB4/91VHbROhvLlVSq5aCsbyQB7CSHkiCHMTRQq dvwKi9ggbWYyZmrZ91OH2t0qf210AiVCWjPazFvTSRrtNc6laZGEMRKXj265RUnpTPxx 6/Qw== X-Forwarded-Encrypted: i=1; AJvYcCXjssXhM9T9/H777si3+jpKT3cZ6uBRX5pIFsmhfHd32MdfjKNwKwZ4E4baYTrZphpm/7Q5huqIgJnyZ6URCSVGZZP/Ava/joHHDmzf8Q== X-Gm-Message-State: AOJu0Yz1syWQuPOsX98B8b9rfJ+C/uEFeDahGJHYrKQMPlj+qIULGYE+ 9VqtEAmTxloXBaANlXvIKPpipAR44IG5C2xYz97kmj6gQqzeNXkNRysg2Oae0+7ZE/WQaa2TuLr ilQ== X-Google-Smtp-Source: AGHT+IEEWasWSJ9byHCocPT0rn5wdP9A8yl8cF0t65kc5fqEIfuaFnuVC5T09t/hlGHF+EVf0JUp5RZPIP4= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6902:c0a:b0:e05:a890:5aaa with SMTP id 3f1490d57ef6-e0b555474d7mr20378276.1.1722038101719; Fri, 26 Jul 2024 16:55:01 -0700 (PDT) Date: Fri, 26 Jul 2024 16:52:18 -0700 In-Reply-To: <20240726235234.228822-1-seanjc@google.com> Mime-Version: 1.0 References: <20240726235234.228822-1-seanjc@google.com> X-Mailer: git-send-email 2.46.0.rc1.232.g9752f9e123-goog Message-ID: <20240726235234.228822-70-seanjc@google.com> Subject: [PATCH v12 69/84] KVM: MIPS: Mark "struct page" pfns accessed only in "slow" page fault path From: Sean Christopherson <seanjc@google.com> To: Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, Tianrui Zhao <zhaotianrui@loongson.cn>, Bibo Mao <maobibo@loongson.cn>, Huacai Chen <chenhuacai@kernel.org>, Michael Ellerman <mpe@ellerman.id.au>, Anup Patel <anup@brainfault.org>, Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Christian Borntraeger <borntraeger@linux.ibm.com>, Janosch Frank <frankja@linux.ibm.com>, Claudio Imbrenda <imbrenda@linux.ibm.com>, Sean Christopherson <seanjc@google.com> Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, David Matlack <dmatlack@google.com>, David Stevens <stevensd@chromium.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240726_165503_522488_A31DC541 X-CRM114-Status: GOOD ( 12.43 ) X-Spam-Score: -9.5 (---------) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Mark pages accessed only in the slow page fault path in order to remove an unnecessary user of kvm_pfn_to_refcounted_page(). Marking pages accessed in the primary MMU during KVM page fault handling is [...] Content analysis details: (-9.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:b4a listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM welcome-list 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.0 DKIMWL_WL_MED DKIMwl.org - Medium trust sender X-BeenThere: kvm-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: <kvm-riscv.lists.infradead.org> List-Unsubscribe: <http://lists.infradead.org/mailman/options/kvm-riscv>, <mailto:kvm-riscv-request@lists.infradead.org?subject=unsubscribe> List-Archive: <http://lists.infradead.org/pipermail/kvm-riscv/> List-Post: <mailto:kvm-riscv@lists.infradead.org> List-Help: <mailto:kvm-riscv-request@lists.infradead.org?subject=help> List-Subscribe: <http://lists.infradead.org/mailman/listinfo/kvm-riscv>, <mailto:kvm-riscv-request@lists.infradead.org?subject=subscribe> Reply-To: Sean Christopherson <seanjc@google.com> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" <kvm-riscv-bounces@lists.infradead.org> Errors-To: kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org |
Series |
KVM: Stop grabbing references to PFNMAP'd pages
|
expand
|
diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c index 4da9ce4eb54d..f1e4b618ec6d 100644 --- a/arch/mips/kvm/mmu.c +++ b/arch/mips/kvm/mmu.c @@ -484,8 +484,6 @@ static int _kvm_mips_map_page_fast(struct kvm_vcpu *vcpu, unsigned long gpa, struct kvm *kvm = vcpu->kvm; gfn_t gfn = gpa >> PAGE_SHIFT; pte_t *ptep; - kvm_pfn_t pfn = 0; /* silence bogus GCC warning */ - bool pfn_valid = false; int ret = 0; spin_lock(&kvm->mmu_lock); @@ -498,12 +496,9 @@ static int _kvm_mips_map_page_fast(struct kvm_vcpu *vcpu, unsigned long gpa, } /* Track access to pages marked old */ - if (!pte_young(*ptep)) { + if (!pte_young(*ptep)) set_pte(ptep, pte_mkyoung(*ptep)); - pfn = pte_pfn(*ptep); - pfn_valid = true; - /* call kvm_set_pfn_accessed() after unlock */ - } + if (write_fault && !pte_dirty(*ptep)) { if (!pte_write(*ptep)) { ret = -EFAULT; @@ -512,7 +507,6 @@ static int _kvm_mips_map_page_fast(struct kvm_vcpu *vcpu, unsigned long gpa, /* Track dirtying of writeable pages */ set_pte(ptep, pte_mkdirty(*ptep)); - pfn = pte_pfn(*ptep); mark_page_dirty(kvm, gfn); } @@ -523,8 +517,6 @@ static int _kvm_mips_map_page_fast(struct kvm_vcpu *vcpu, unsigned long gpa, out: spin_unlock(&kvm->mmu_lock); - if (pfn_valid) - kvm_set_pfn_accessed(pfn); return ret; }
Mark pages accessed only in the slow page fault path in order to remove an unnecessary user of kvm_pfn_to_refcounted_page(). Marking pages accessed in the primary MMU during KVM page fault handling isn't harmful, but it's largely pointless and likely a waste of a cycles since the primary MMU will call into KVM via mmu_notifiers when aging pages. I.e. KVM participates in a "pull" model, so there's no need to also "push" updates. Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/mips/kvm/mmu.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-)