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,URIBL_BLOCKED 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 9855DCA9EBA for ; Tue, 22 Oct 2019 17:16:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 47BE22086D for ; Tue, 22 Oct 2019 17:16:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GnCRogCT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 47BE22086D 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 EB1DE6B0008; Tue, 22 Oct 2019 13:16:09 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E627C6B0010; Tue, 22 Oct 2019 13:16:09 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D29A26B0266; Tue, 22 Oct 2019 13:16:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0022.hostedemail.com [216.40.44.22]) by kanga.kvack.org (Postfix) with ESMTP id 6A64D6B0008 for ; Tue, 22 Oct 2019 13:16:09 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 2319C8419 for ; Tue, 22 Oct 2019 17:16:09 +0000 (UTC) X-FDA: 76072073658.17.coast43_52ba9e21d9936 X-HE-Tag: coast43_52ba9e21d9936 X-Filterd-Recvd-Size: 6897 Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Tue, 22 Oct 2019 17:16:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571764567; 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=FajnFySKW/A5xDPqu9rw0Ua4hR3TkmQD80jFnqfnPxM=; b=GnCRogCTDpnhmDEdOZRo7GWzYBIxwYdvwpBajKNxNEIjNwLVvcV6sAKKobCVHktBkUhfDN JP6xVs7sxv41sfTksQJK/IgnLBPKIsOqe1lvfdE1PM8fq0Pbwp/jNZLeRGGlhYqqpQDPk6 ax/bEFoXGGAcPuH+AuVpqWkmWXnrbgo= 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-327-nIyOmixtOyKHdiiLzBpxAg-1; Tue, 22 Oct 2019 13:16:06 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E1C24800D53; Tue, 22 Oct 2019 17:16:00 +0000 (UTC) Received: from t460s.redhat.com (ovpn-116-248.ams2.redhat.com [10.36.116.248]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2FF84612AB; Tue, 22 Oct 2019 17:15:42 +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 , Ben Chan , Benjamin Herrenschmidt , Borislav Petkov , Boris Ostrovsky , Christophe Leroy , Cornelia Huck , Dan Carpenter , Dan Williams , Dave Hansen , Fabio Estevam , Greg Kroah-Hartman , Haiyang Zhang , "H. Peter Anvin" , Ingo Molnar , "Isaac J. Manjarres" , Jeremy Sowden , Jim Mattson , Joerg Roedel , Johannes Weiner , Juergen Gross , KarimAllah Ahmed , Kate Stewart , Kees Cook , "K. Y. Srinivasan" , Madhumitha Prabakaran , Matt Sickler , Mel Gorman , Michael Ellerman , Michal Hocko , Mike Rapoport , Mike Rapoport , Nicholas Piggin , Nishka Dasgupta , 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?= , Rob Springer , Sasha Levin , Sean Christopherson , =?UTF-8?q?Simon=20Sandstr=C3=B6m?= , Stefano Stabellini , Stephen Hemminger , Thomas Gleixner , Todd Poynor , Vandana BN , Vitaly Kuznetsov , Vlastimil Babka , Wanpeng Li , YueHaibing Subject: [PATCH RFC v1 08/12] powerpc/book3s: Prepare kvmppc_book3s_instantiate_page() for PG_reserved changes Date: Tue, 22 Oct 2019 19:12:35 +0200 Message-Id: <20191022171239.21487-9-david@redhat.com> In-Reply-To: <20191022171239.21487-1-david@redhat.com> References: <20191022171239.21487-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-MC-Unique: nIyOmixtOyKHdiiLzBpxAg-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 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. Note that ZONE_DEVICE memory is never online (IOW, managed by the buddy). Switching to pfn_to_online_page() keeps the existing behavior for PFNs without a memmap and for ZONE_DEVICE memory. Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Michael Ellerman Signed-off-by: David Hildenbrand --- arch/powerpc/kvm/book3s_64_mmu_radix.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book= 3s_64_mmu_radix.c index 2d415c36a61d..05397c0561fc 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -801,12 +801,14 @@ int kvmppc_book3s_instantiate_page(struct kvm_vcpu *v= cpu, =09=09=09=09=09 writing, upgrade_p); =09=09if (is_error_noslot_pfn(pfn)) =09=09=09return -EFAULT; -=09=09page =3D NULL; -=09=09if (pfn_valid(pfn)) { -=09=09=09page =3D pfn_to_page(pfn); -=09=09=09if (PageReserved(page)) -=09=09=09=09page =3D NULL; -=09=09} +=09=09/* +=09=09 * We treat any pages that are not online (not managed by the +=09=09 * buddy) as reserved - this includes ZONE_DEVICE pages and +=09=09 * pages without a memmap (e.g., mapped via /dev/mem). +=09=09 */ +=09=09page =3D pfn_to_online_page(pfn); +=09=09if (page && PageReserved(page)) +=09=09=09page =3D NULL; =09} =20 =09/* --=20 2.21.0