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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 AAD46CA9EBC for ; Thu, 24 Oct 2019 20:03:00 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5B1CE20684 for ; Thu, 24 Oct 2019 20:03:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dCSeCeM6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B1CE20684 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46zdTG3vgSzDqYk for ; Fri, 25 Oct 2019 07:02:58 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=redhat.com (client-ip=205.139.110.120; helo=us-smtp-1.mimecast.com; envelope-from=david@redhat.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.b="dCSeCeM6"; dkim-atps=neutral Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 46zR2829q0zDqHv for ; Thu, 24 Oct 2019 23:12:16 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1571919128; 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=gYC6fNIGttIcUtgmCXmgJGRK+sWEvXrn/dTQBLMCSac=; b=dCSeCeM60hZGHiIn1XBNI7Y27vKvoCH3cd3+5v/mmyvfFOuV4I8zBYx2iIvDgPredrCUUe bq9miludVrpD6w2bbMzmeHKTGwO9zBJpTpQM1qElzNpJ+yCj7ZtUPUstxSJj45VHnNWg9C 2V5LvzoZRUqAWwRFN370VgSl6X5azf4= 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-282-4jB-26J_NR2cHntMTRc7Nw-1; Thu, 24 Oct 2019 08:12:06 -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 73C86801E5C; Thu, 24 Oct 2019 12:12:01 +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 10391196B2; Thu, 24 Oct 2019 12:11:34 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Subject: [PATCH v1 05/10] powerpc/book3s: Prepare kvmppc_book3s_instantiate_page() for PG_reserved changes Date: Thu, 24 Oct 2019 14:09:33 +0200 Message-Id: <20191024120938.11237-6-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: 4jB-26J_NR2cHntMTRc7Nw-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Fri, 25 Oct 2019 06:41:16 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hyperv@vger.kernel.org, Michal Hocko , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , kvm@vger.kernel.org, David Hildenbrand , KarimAllah Ahmed , Dave Hansen , Alexander Duyck , Michal Hocko , linux-mm@kvack.org, Pavel Tatashin , Paul Mackerras , "H. Peter Anvin" , Wanpeng Li , Alexander Duyck , "K. Y. Srinivasan" , Dan Williams , Kees Cook , devel@driverdev.osuosl.org, Stefano Stabellini , Stephen Hemminger , "Aneesh Kumar K.V" , Joerg Roedel , x86@kernel.org, YueHaibing , "Matthew Wilcox \(Oracle\)" , Mike Rapoport , Peter Zijlstra , Ingo Molnar , Vlastimil Babka , Anthony Yznaga , Oscar Salvador , "Isaac J. Manjarres" , Matt Sickler , Juergen Gross , Anshuman Khandual , Haiyang Zhang , Sasha Levin , kvm-ppc@vger.kernel.org, Qian Cai , Alex Williamson , Mike Rapoport , Borislav Petkov , Nicholas Piggin , Andy Lutomirski , xen-devel@lists.xenproject.org, Boris Ostrovsky , Vitaly Kuznetsov , Allison Randal , Jim Mattson , Mel Gorman , Cornelia Huck , Pavel Tatashin , Sean Christopherson , Thomas Gleixner , Johannes Weiner , Paolo Bonzini , Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 kvmppc_book3s_instantiate_page() similar to kvm_is_reserved_pfn() to make sure the function produces the same result once we stop setting ZONE_DEVICE pages PG_reserved. 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 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=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 0A0A0CA9EAF for ; Thu, 24 Oct 2019 12:12:24 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CE25720856 for ; Thu, 24 Oct 2019 12:12:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dCSeCeM6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CE25720856 Authentication-Results: mail.kernel.org; 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bh=gYC6fNIGttIcUtgmCXmgJGRK+sWEvXrn/dTQBLMCSac=; b=dCSeCeM60hZGHiIn1XBNI7Y27vKvoCH3cd3+5v/mmyvfFOuV4I8zBYx2iIvDgPredrCUUe bq9miludVrpD6w2bbMzmeHKTGwO9zBJpTpQM1qElzNpJ+yCj7ZtUPUstxSJj45VHnNWg9C 2V5LvzoZRUqAWwRFN370VgSl6X5azf4= 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-282-4jB-26J_NR2cHntMTRc7Nw-1; Thu, 24 Oct 2019 08:12:06 -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 73C86801E5C; Thu, 24 Oct 2019 12:12:01 +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 10391196B2; Thu, 24 Oct 2019 12:11:34 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Date: Thu, 24 Oct 2019 14:09:33 +0200 Message-Id: <20191024120938.11237-6-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: 4jB-26J_NR2cHntMTRc7Nw-1 X-Mimecast-Spam-Score: 0 Subject: [Xen-devel] [PATCH v1 05/10] powerpc/book3s: Prepare kvmppc_book3s_instantiate_page() for PG_reserved changes X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: linux-hyperv@vger.kernel.org, Michal Hocko , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , kvm@vger.kernel.org, David Hildenbrand , KarimAllah Ahmed , Benjamin Herrenschmidt , Dave Hansen , Alexander Duyck , Michal Hocko , Paul Mackerras , linux-mm@kvack.org, Pavel Tatashin , Paul Mackerras , Michael Ellerman , "H. Peter Anvin" , Wanpeng Li , Alexander Duyck , "K. Y. Srinivasan" , Dan Williams , Kees Cook , devel@driverdev.osuosl.org, Stefano Stabellini , Stephen Hemminger , "Aneesh Kumar K.V" , Joerg Roedel , x86@kernel.org, YueHaibing , "Matthew Wilcox \(Oracle\)" , Mike Rapoport , Peter Zijlstra , Ingo Molnar , Vlastimil Babka , Anthony Yznaga , Oscar Salvador , "Isaac J. Manjarres" , Matt Sickler , Juergen Gross , Anshuman Khandual , Haiyang Zhang , Sasha Levin , kvm-ppc@vger.kernel.org, Qian Cai , Alex Williamson , Mike Rapoport , Borislav Petkov , Nicholas Piggin , Andy Lutomirski , xen-devel@lists.xenproject.org, Boris Ostrovsky , Vitaly Kuznetsov , Allison Randal , Jim Mattson , Christophe Leroy , Mel Gorman , Cornelia Huck , Pavel Tatashin , Sean Christopherson , Thomas Gleixner , Johannes Weiner , Paolo Bonzini , Andrew Morton , linuxppc-dev@lists.ozlabs.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" UmlnaHQgbm93LCBaT05FX0RFVklDRSBtZW1vcnkgaXMgYWx3YXlzIHNldCBQR19yZXNlcnZlZC4g V2Ugd2FudCB0bwpjaGFuZ2UgdGhhdC4KCktWTSBoYXMgdGhpcyB3ZWlyZCB1c2UgY2FzZSB0aGF0 IHlvdSBjYW4gbWFwIGFueXRoaW5nIGZyb20gL2Rldi9tZW0KaW50byB0aGUgZ3Vlc3QuIHBmbl92 YWxpZCgpIGlzIG5vdCBhIHJlbGlhYmxlIGNoZWNrIHdoZXRoZXIgdGhlIG1lbW1hcAp3YXMgaW5p dGlhbGl6ZWQgYW5kIGNhbiBiZSB0b3VjaGVkLiBwZm5fdG9fb25saW5lX3BhZ2UoKSBtYWtlcyBz dXJlCnRoYXQgd2UgaGF2ZSBhbiBpbml0aWFsaXplZCBtZW1tYXAgKGFuZCBkb24ndCBoYXZlIFpP TkVfREVWSUNFIG1lbW9yeSkuCgpSZXdyaXRlIGt2bXBwY19ib29rM3NfaW5zdGFudGlhdGVfcGFn ZSgpIHNpbWlsYXIgdG8ga3ZtX2lzX3Jlc2VydmVkX3BmbigpCnRvIG1ha2Ugc3VyZSB0aGUgZnVu Y3Rpb24gcHJvZHVjZXMgdGhlIHNhbWUgcmVzdWx0IG9uY2Ugd2Ugc3RvcCBzZXR0aW5nClpPTkVf REVWSUNFIHBhZ2VzIFBHX3Jlc2VydmVkLgoKQ2M6IFBhdWwgTWFja2VycmFzIDxwYXVsdXNAb3ps YWJzLm9yZz4KQ2M6IEJlbmphbWluIEhlcnJlbnNjaG1pZHQgPGJlbmhAa2VybmVsLmNyYXNoaW5n Lm9yZz4KQ2M6IE1pY2hhZWwgRWxsZXJtYW4gPG1wZUBlbGxlcm1hbi5pZC5hdT4KU2lnbmVkLW9m Zi1ieTogRGF2aWQgSGlsZGVuYnJhbmQgPGRhdmlkQHJlZGhhdC5jb20+Ci0tLQogYXJjaC9wb3dl cnBjL2t2bS9ib29rM3NfNjRfbW11X3JhZGl4LmMgfCAxNCArKysrKysrKy0tLS0tLQogMSBmaWxl IGNoYW5nZWQsIDggaW5zZXJ0aW9ucygrKSwgNiBkZWxldGlvbnMoLSkKCmRpZmYgLS1naXQgYS9h cmNoL3Bvd2VycGMva3ZtL2Jvb2szc182NF9tbXVfcmFkaXguYyBiL2FyY2gvcG93ZXJwYy9rdm0v Ym9vazNzXzY0X21tdV9yYWRpeC5jCmluZGV4IDJkNDE1YzM2YTYxZC4uMDUzOTdjMDU2MWZjIDEw MDY0NAotLS0gYS9hcmNoL3Bvd2VycGMva3ZtL2Jvb2szc182NF9tbXVfcmFkaXguYworKysgYi9h cmNoL3Bvd2VycGMva3ZtL2Jvb2szc182NF9tbXVfcmFkaXguYwpAQCAtODAxLDEyICs4MDEsMTQg QEAgaW50IGt2bXBwY19ib29rM3NfaW5zdGFudGlhdGVfcGFnZShzdHJ1Y3Qga3ZtX3ZjcHUgKnZj cHUsCiAJCQkJCSAgIHdyaXRpbmcsIHVwZ3JhZGVfcCk7CiAJCWlmIChpc19lcnJvcl9ub3Nsb3Rf cGZuKHBmbikpCiAJCQlyZXR1cm4gLUVGQVVMVDsKLQkJcGFnZSA9IE5VTEw7Ci0JCWlmIChwZm5f dmFsaWQocGZuKSkgewotCQkJcGFnZSA9IHBmbl90b19wYWdlKHBmbik7Ci0JCQlpZiAoUGFnZVJl c2VydmVkKHBhZ2UpKQotCQkJCXBhZ2UgPSBOVUxMOwotCQl9CisJCS8qCisJCSAqIFdlIHRyZWF0 IGFueSBwYWdlcyB0aGF0IGFyZSBub3Qgb25saW5lIChub3QgbWFuYWdlZCBieSB0aGUKKwkJICog YnVkZHkpIGFzIHJlc2VydmVkIC0gdGhpcyBpbmNsdWRlcyBaT05FX0RFVklDRSBwYWdlcyBhbmQK KwkJICogcGFnZXMgd2l0aG91dCBhIG1lbW1hcCAoZS5nLiwgbWFwcGVkIHZpYSAvZGV2L21lbSku CisJCSAqLworCQlwYWdlID0gcGZuX3RvX29ubGluZV9wYWdlKHBmbik7CisJCWlmIChwYWdlICYm IFBhZ2VSZXNlcnZlZChwYWdlKSkKKwkJCXBhZ2UgPSBOVUxMOwogCX0KIAogCS8qCi0tIAoyLjIx LjAKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpYZW4t ZGV2ZWwgbWFpbGluZyBsaXN0Clhlbi1kZXZlbEBsaXN0cy54ZW5wcm9qZWN0Lm9yZwpodHRwczov L2xpc3RzLnhlbnByb2plY3Qub3JnL21haWxtYW4vbGlzdGluZm8veGVuLWRldmVs 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 D395ECA9EAF for ; 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Thu, 24 Oct 2019 08:12:06 -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 73C86801E5C; Thu, 24 Oct 2019 12:12:01 +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 10391196B2; Thu, 24 Oct 2019 12:11:34 +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 05/10] powerpc/book3s: Prepare kvmppc_book3s_instantiate_page() for PG_reserved changes Date: Thu, 24 Oct 2019 14:09:33 +0200 Message-Id: <20191024120938.11237-6-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: 4jB-26J_NR2cHntMTRc7Nw-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 (and don't have ZONE_DEVICE memory). Rewrite kvmppc_book3s_instantiate_page() similar to kvm_is_reserved_pfn() to make sure the function produces the same result once we stop setting ZONE_DEVICE pages PG_reserved. 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