From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (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 716DC1E1C3A for ; Thu, 10 Oct 2024 18:26:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728584793; cv=none; b=tEv+2LUz7hFe/GuI0+mrT6jwDWZwGFENOSyQoZtkJbn30mt0metpT+T5wb+U/CEoyz+TJ7miYsKxKrKO+7fVnshVhFCmgu5KrHhVOMBwO9DI9mQUECYaN6ZiMCy9Siyox2K88Yhw0SQL8lc2ZOsh1Q5cOZvsB1EA0NNQYk+y+Os= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728584793; c=relaxed/simple; bh=P6yv0TC0koYnkFHtfd6W3SlzMlk4IripfIbi6+Lm/9A=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=a2d/+odCzFeksHpyNQhqv38jZHmozDSH1rHR4NV+3KZlPbSrjx+Sgns7Eq4BV1FROU4Z+1T2GYv7djoFOfxgvAIJh1NL2Swcrw3ruKsTnQMe9nAotO2yaHdTpHtRPtSXex1OZh2kTlq4xTP/RkOHY+yPxNYN/d0dIrzGI4/Xe6M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Ykj8FNgw; arc=none smtp.client-ip=209.85.210.202 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--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Ykj8FNgw" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-71e123d3d22so1429113b3a.3 for ; Thu, 10 Oct 2024 11:26:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1728584792; x=1729189592; darn=lists.linux.dev; h=content-transfer-encoding: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=l4aL9ye2ZxrCnqTpLqQlinT65BUul16gfmDzid4NN5Y=; b=Ykj8FNgwbjCHfhPJp9mcdAgHvIKiNg7n0K2CwJeUVFKU6/B0H0VgbrfblYsIqUuoBS ILBTsXo1QtlXht8micjjrx5xsO4e1tPdSS1+3xX2cjaZxAN1MO5DEBe+uEgVA+SALRqe GzZPgu1LaGpkrEiKPE3hdPfvusr51A+dsnpLYeScyWDRPbVmmzx933vtOHjZ0eTwLY4y kd8H1wt51tHVd1QouRoPAO+6ozxPNoqVkz3+h4/+I0LKCTlmF+n8NSjho92NfhWI6PLB mVlGFn00CmuiYucPQTC/eCs69DHMNzJ3pLaoML4pzc1x89/CjWXTCGfF004bwLxLo8Pd nKJQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728584792; x=1729189592; h=content-transfer-encoding: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=l4aL9ye2ZxrCnqTpLqQlinT65BUul16gfmDzid4NN5Y=; b=OPTEnLCEFOujN+u6mHi5yCf715y38bntvVPhI2XXz7DaT91wpkhr72CA1s1GdR1g0r +QLYQvQxt7/ppaGB2bUBqoFRmNXjQ7PhZ5IPvN7YxrvVQcyUJ37zxSvSkrszGBavo7lU LDCLT7UY9DitZ5LUpJ3ye+jKC8t7xEZVQP5qWSoXtxzUsgbiuDGWQQTw5bgHpHlIeI0b 4/yOFmIoFhQ/w2Fp5g4vI+7BlyY8gmG8ATTZMJMqThC5egBs57Bd3xdJBXfBU7wIBOiG zUXWtqFchrA9uCkb0DYw2P3tidJ2XZ7FJJ3t/Be3DoRmMXAZzVlvQAD4iTuQR5t6c5hJ wK9Q== X-Forwarded-Encrypted: i=1; AJvYcCWu1RunVBJUyq1oNXuZVoplVSwvrqcho6cvoazmyxl5au6dIqAF4SQEALRbVyG/aT8bw8gdKXw=@lists.linux.dev X-Gm-Message-State: AOJu0YwH60iLWwNYwplKjldmqsbJwd3k7vgvHE0HcVbcLIHn9Jf4v7O0 xz2wZu+NEXbDZ54roYXGCxasJLRnRSMAzQwd9nf6YhFzwDJg4q84KgQxSRXb+c8ci29Q+txsotd fLg== X-Google-Smtp-Source: AGHT+IFunsAHL0GYDEyxrwNnSExkBiXOv88aJkEgjVxw5ZDXOBsEr4Eha3ByEK4QIBQ4extfr7SnAz+Fl/s= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:9d:3983:ac13:c240]) (user=seanjc job=sendgmr) by 2002:aa7:9184:0:b0:71d:f7c9:8cb3 with SMTP id d2e1a72fcca58-71e1dbf1ab5mr7799b3a.5.1728584790633; Thu, 10 Oct 2024 11:26:30 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 10 Oct 2024 11:23:49 -0700 In-Reply-To: <20241010182427.1434605-1-seanjc@google.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241010182427.1434605-1-seanjc@google.com> X-Mailer: git-send-email 2.47.0.rc1.288.g06298d1525-goog Message-ID: <20241010182427.1434605-48-seanjc@google.com> Subject: [PATCH v13 47/85] KVM: x86/mmu: Put refcounted pages instead of blindly releasing pfns From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Sean Christopherson 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, "=?UTF-8?q?Alex=20Benn=C3=A9e?=" , Yan Zhao , David Matlack , David Stevens , Andrew Jones Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Now that all x86 page fault paths precisely track refcounted pages, use Use kvm_page_fault.refcounted_page to put references to struct page memory when finishing page faults. This is a baby step towards eliminating kvm_pfn_to_refcounted_page(). Tested-by: Alex Benn=C3=A9e Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index a038cde74f0d..f9b7e3a7370f 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -4373,6 +4373,9 @@ static void kvm_mmu_finish_page_fault(struct kvm_vcpu= *vcpu, lockdep_assert_once(lockdep_is_held(&vcpu->kvm->mmu_lock) || r =3D=3D RET_PF_RETRY); =20 + if (!fault->refcounted_page) + return; + /* * If the page that KVM got from the *primary MMU* is writable, and KVM * installed or reused a SPTE, mark the page/folio dirty. Note, this @@ -4384,9 +4387,9 @@ static void kvm_mmu_finish_page_fault(struct kvm_vcpu= *vcpu, * folio dirty if KVM could locklessly make the SPTE writable. */ if (!fault->map_writable || r =3D=3D RET_PF_RETRY) - kvm_release_pfn_clean(fault->pfn); + kvm_release_page_clean(fault->refcounted_page); else - kvm_release_pfn_dirty(fault->pfn); + kvm_release_page_dirty(fault->refcounted_page); } =20 static int kvm_mmu_faultin_pfn_private(struct kvm_vcpu *vcpu, --=20 2.47.0.rc1.288.g06298d1525-goog