From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (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 DBC45156230 for ; Fri, 26 Jul 2024 23:52:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722037971; cv=none; b=YHogEMs7q6HjwJuWLRAInGo41JZ9+kv5QkGfPRKGMw2AjFxYwfEuADOlxOaV3aMIDCzWgpTdhhe1/2H+TwFV3QJJa1T6k7y9MwZXISr10wL87Qf6fnk7sqQISAX6N4AvYqnqaMYGMSKLFyljpfd702Sa8zhY3yfEsYj8DRFpJIo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722037971; c=relaxed/simple; bh=o0JBLF6HQjluB3iIirHhfso1PE7Zf/Ht0oB2KRN4Rqk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Ip2AhWifjsNqABzKNabkiNRILui063f5qfGFSGV2Y67SW6OWjvKIYw5bt8ejNT+g8RMkePrxmoI/OuuTNicD71h2yZ5sGpNThg9k0v4F1OsPfK1XRZMqz5SS2P5UPi83mmPWHz/iL25kKjARQuSnJcXz7HvQbS0glwhCYBZdIHc= 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=Z65s61vJ; arc=none smtp.client-ip=209.85.210.201 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="Z65s61vJ" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-70d14709555so1472814b3a.2 for ; Fri, 26 Jul 2024 16:52:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1722037968; x=1722642768; darn=lists.linux.dev; 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=1PAT6v4tn5ltatT/kjen/UunIT1fRhHnj971W9WBYQU=; b=Z65s61vJ0G6iPLo8B4wgMvYgspN4WetZvJrFZTXnj3B9uXnyEBUoSNdCf5F0CcPpSW xB+vHmU51KSE7WjU/QT/la7xOhDRzCOVKgX8v7a4xDYZ7l1l4OPccDhH8+D/n2ghFuTl nQYbdfyzU94LydsZzJAKofL8Ols5Iue9l009z4uvtwsyaFOaN/VV2/AUaK6DxyboUJ4V JpnZBKIpmps2DR2p08CkOkm7W5WrynljpZtnsAIa7YgZD2UiTAD1KMPMhBrJCPJLUBdm PEY0Y6kFGEVkldgGzgGYgnIKcDwtie4+TK+nIPmjFVxEn92RSnEDfvKxxksF1WZPMLd7 VdxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722037968; x=1722642768; 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=1PAT6v4tn5ltatT/kjen/UunIT1fRhHnj971W9WBYQU=; b=rMppow8mV4thu/8vP1i7e36K6xm82jqwlFHbat+BN5LbVu0F5TFB4oTeWau/VW5DCI Op5Xq81pQYpYW87d0q38wXmySuxUzYpVLVaofgZuyWr1Upz5uw/or7eZK2JPpYCWYa2t EvVBNhDSzYaA46PttPv56M1m3Wdxr4ycE9Wicu7dvW9tWYsQ/nS6ClVo75Ywp6jlL2ul sxMkl12D5l40VTS7dCDC1dpU3fIWndFukN/HyKhtvbfHKGcnhVuXW7akJGbhxOrMN2Kv FB157o03pum8AMKudLxKBBzSynNxhEOfOE6yEK9b5Z/Ml/mt5yqDNGDjlZeicODJ4/wG JGiQ== X-Forwarded-Encrypted: i=1; AJvYcCXg6H/riFmNPCzDAEeq23lPnUhvEXOfM2C5ytZHKbx3n35G+1b+4tOi8AtV2NTM+gqqBfg3zSmA/QmxXYPvOPtN8lg/U64Z X-Gm-Message-State: AOJu0YzlA1rKP4rzXxSOrLKJwnprPiaYQz0bc2mVieU/uPIfpi8LjF9+ BomDh9EJZy/G4K6dfg1S7kaLVNuILtsJZ9CRNfspJkE83CiIlboD8ec1kt0IZ6AsWEQySxWNSIf VKg== X-Google-Smtp-Source: AGHT+IGybwcUaaDWGaRnVlNYMzL2lybkBwi+pdiFBv1toqDzA479d7SifMoC4AbRMiwOqaRTolCzzwjRN5U= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6a00:731c:b0:70d:13c2:1d08 with SMTP id d2e1a72fcca58-70ecedb0dfamr2514b3a.3.1722037967857; Fri, 26 Jul 2024 16:52:47 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 26 Jul 2024 16:51:14 -0700 In-Reply-To: <20240726235234.228822-1-seanjc@google.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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: <20240726235234.228822-6-seanjc@google.com> Subject: [PATCH v12 05/84] KVM: Add kvm_release_page_unused() API to put pages that KVM never consumes 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, David Matlack , David Stevens Content-Type: text/plain; charset="UTF-8" Add an API to release an unused page, i.e. to put a page without marking it accessed or dirty. The API will be used when KVM faults-in a page but bails before installing the guest mapping (and other similar flows). Signed-off-by: Sean Christopherson --- include/linux/kvm_host.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 3d9617d1de41..c5d39a337aa3 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1201,6 +1201,15 @@ unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable); unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn); unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn, bool *writable); + +static inline void kvm_release_page_unused(struct page *page) +{ + if (!page) + return; + + put_page(page); +} + void kvm_release_page_clean(struct page *page); void kvm_release_page_dirty(struct page *page); -- 2.46.0.rc1.232.g9752f9e123-goog