From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2AD04CA9EAF for ; Thu, 24 Oct 2019 12:11:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CC1E921872 for ; Thu, 24 Oct 2019 12:11:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="c7cncqgG" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC1E921872 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7B9976B0007; Thu, 24 Oct 2019 08:11:14 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 791046B0008; Thu, 24 Oct 2019 08:11:14 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 659D86B000A; Thu, 24 Oct 2019 08:11:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0187.hostedemail.com [216.40.44.187]) by kanga.kvack.org (Postfix) with ESMTP id 433806B0007 for ; Thu, 24 Oct 2019 08:11:14 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id DBF458249980 for ; Thu, 24 Oct 2019 12:11:13 +0000 (UTC) X-FDA: 76078562826.06.way43_aad23aab8a2d X-HE-Tag: way43_aad23aab8a2d X-Filterd-Recvd-Size: 6207 Received: from us-smtp-delivery-1.mimecast.com (us-smtp-1.mimecast.com [205.139.110.61]) by imf13.hostedemail.com (Postfix) with ESMTP for ; Thu, 24 Oct 2019 12:11:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571919072; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Snv/eN2JSs1CKovdcEZrKtv3120OMPYnvMUKCAi50+E=; b=c7cncqgGOU9BtgVCAkyh4zahN4gd047yl0h3NqpFCd/RCxZPIsSSKHEgM9oQRV6f3DHEm7 h7be7LGyfJAfWtUWadeaSmwZvB0BzJVhhvbFrQueLRgNzcZOKQRyE0gqCaONklG9NkNVyK oloPEMxioZE9/dj9zesAoIKe75UKEZU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-78-XqXphJdGOZKQf4BuJSlwgQ-1; Thu, 24 Oct 2019 08:11:10 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 040841005500; Thu, 24 Oct 2019 12:11:04 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-141.ams2.redhat.com [10.36.116.141]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7E74A166A0; Thu, 24 Oct 2019 12:10:43 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , Michal Hocko , Andrew Morton , kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, devel@driverdev.osuosl.org, xen-devel@lists.xenproject.org, x86@kernel.org, Alexander Duyck , Alexander Duyck , Alex Williamson , Allison Randal , Andy Lutomirski , "Aneesh Kumar K.V" , Anshuman Khandual , Anthony Yznaga , Benjamin Herrenschmidt , Borislav Petkov , Boris Ostrovsky , Christophe Leroy , Cornelia Huck , Dan Williams , Dave Hansen , Haiyang Zhang , "H. Peter Anvin" , Ingo Molnar , "Isaac J. Manjarres" , Jim Mattson , Joerg Roedel , Johannes Weiner , Juergen Gross , KarimAllah Ahmed , Kees Cook , "K. Y. Srinivasan" , "Matthew Wilcox (Oracle)" , Matt Sickler , Mel Gorman , Michael Ellerman , Michal Hocko , Mike Rapoport , Mike Rapoport , Nicholas Piggin , Oscar Salvador , Paolo Bonzini , Paul Mackerras , Paul Mackerras , Pavel Tatashin , Pavel Tatashin , Peter Zijlstra , Qian Cai , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Sasha Levin , Sean Christopherson , Stefano Stabellini , Stephen Hemminger , Thomas Gleixner , Vitaly Kuznetsov , Vlastimil Babka , Wanpeng Li , YueHaibing Subject: [PATCH v1 03/10] KVM: Prepare kvm_is_reserved_pfn() for PG_reserved changes Date: Thu, 24 Oct 2019 14:09:31 +0200 Message-Id: <20191024120938.11237-4-david@redhat.com> In-Reply-To: <20191024120938.11237-1-david@redhat.com> References: <20191024120938.11237-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: XqXphJdGOZKQf4BuJSlwgQ-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Right now, ZONE_DEVICE memory is always set PG_reserved. We want to change that. KVM has this weird use case that you can map anything from /dev/mem into the guest. pfn_valid() is not a reliable check whether the memmap was initialized and can be touched. pfn_to_online_page() makes sure that we have an initialized memmap (and don't have ZONE_DEVICE memory). Rewrite kvm_is_reserved_pfn() to make sure the function produces the same result once we stop setting ZONE_DEVICE pages PG_reserved. Cc: Paolo Bonzini Cc: "Radim Kr=C4=8Dm=C3=A1=C5=99" Cc: Michal Hocko Cc: Dan Williams Cc: KarimAllah Ahmed Signed-off-by: David Hildenbrand --- virt/kvm/kvm_main.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index e9eb666eb6e8..9d18cc67d124 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -151,9 +151,15 @@ __weak int kvm_arch_mmu_notifier_invalidate_range(stru= ct kvm *kvm, =20 bool kvm_is_reserved_pfn(kvm_pfn_t pfn) { -=09if (pfn_valid(pfn)) -=09=09return PageReserved(pfn_to_page(pfn)); +=09struct page *page =3D pfn_to_online_page(pfn); =20 +=09/* +=09 * We treat any pages that are not online (not managed by the buddy) +=09 * as reserved - this includes ZONE_DEVICE pages and pages without +=09 * a memmap (e.g., mapped via /dev/mem). +=09 */ +=09if (page) +=09=09return PageReserved(page); =09return true; } =20 --=20 2.21.0