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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 1790DC282C4 for ; Mon, 4 Feb 2019 15:15:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D95AE2080F for ; Mon, 4 Feb 2019 15:15:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731247AbfBDPPz (ORCPT ); Mon, 4 Feb 2019 10:15:55 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56889 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727217AbfBDPPy (ORCPT ); Mon, 4 Feb 2019 10:15:54 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B8B5DC087321; Mon, 4 Feb 2019 15:15:52 +0000 (UTC) Received: from [10.67.116.77] (ovpn-116-77.sin2.redhat.com [10.67.116.77]) by smtp.corp.redhat.com (Postfix) with ESMTP id B18A252FC1; Mon, 4 Feb 2019 15:15:45 +0000 (UTC) Subject: Re: [PATCH v1] KVM: s390: vsie: fix Do the CRYCB validation first To: pmorel@linux.ibm.com, borntraeger@de.ibm.com Cc: linux-kernel@vger.kernel.org, cohuck@redhat.com, linux-s390@vger.kernel.org, kvm@vger.kernel.org, frankja@linux.ibm.com, akrowiak@linux.ibm.com, pasic@linux.ibm.com, Claudio Imbrenda References: <1549014725-28216-1-git-send-email-pmorel@linux.ibm.com> <1549014725-28216-2-git-send-email-pmorel@linux.ibm.com> <3bb397e9-d679-1152-1b42-d633682b3272@linux.ibm.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwX4EEwECACgFAljj9eoCGwMFCQlmAYAGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEE3eEPcA/4Na5IIP/3T/FIQMxIfNzZshIq687qgG 8UbspuE/YSUDdv7r5szYTK6KPTlqN8NAcSfheywbuYD9A4ZeSBWD3/NAVUdrCaRP2IvFyELj xoMvfJccbq45BxzgEspg/bVahNbyuBpLBVjVWwRtFCUEXkyazksSv8pdTMAs9IucChvFmmq3 jJ2vlaz9lYt/lxN246fIVceckPMiUveimngvXZw21VOAhfQ+/sofXF8JCFv2mFcBDoa7eYob s0FLpmqFaeNRHAlzMWgSsP80qx5nWWEvRLdKWi533N2vC/EyunN3HcBwVrXH4hxRBMco3jvM m8VKLKao9wKj82qSivUnkPIwsAGNPdFoPbgghCQiBjBe6A75Z2xHFrzo7t1jg7nQfIyNC7ez MZBJ59sqA9EDMEJPlLNIeJmqslXPjmMFnE7Mby/+335WJYDulsRybN+W5rLT5aMvhC6x6POK z55fMNKrMASCzBJum2Fwjf/VnuGRYkhKCqqZ8gJ3OvmR50tInDV2jZ1DQgc3i550T5JDpToh dPBxZocIhzg+MBSRDXcJmHOx/7nQm3iQ6iLuwmXsRC6f5FbFefk9EjuTKcLMvBsEx+2DEx0E UnmJ4hVg7u1PQ+2Oy+Lh/opK/BDiqlQ8Pz2jiXv5xkECvr/3Sv59hlOCZMOaiLTTjtOIU7Tq 7ut6OL64oAq+zsFNBFXLn5EBEADn1959INH2cwYJv0tsxf5MUCghCj/CA/lc/LMthqQ773ga uB9mN+F1rE9cyyXb6jyOGn+GUjMbnq1o121Vm0+neKHUCBtHyseBfDXHA6m4B3mUTWo13nid 0e4AM71r0DS8+KYh6zvweLX/LL5kQS9GQeT+QNroXcC1NzWbitts6TZ+IrPOwT1hfB4WNC+X 2n4AzDqp3+ILiVST2DT4VBc11Gz6jijpC/KI5Al8ZDhRwG47LUiuQmt3yqrmN63V9wzaPhC+ xbwIsNZlLUvuRnmBPkTJwwrFRZvwu5GPHNndBjVpAfaSTOfppyKBTccu2AXJXWAE1Xjh6GOC 8mlFjZwLxWFqdPHR1n2aPVgoiTLk34LR/bXO+e0GpzFXT7enwyvFFFyAS0Nk1q/7EChPcbRb hJqEBpRNZemxmg55zC3GLvgLKd5A09MOM2BrMea+l0FUR+PuTenh2YmnmLRTro6eZ/qYwWkC u8FFIw4pT0OUDMyLgi+GI1aMpVogTZJ70FgV0pUAlpmrzk/bLbRkF3TwgucpyPtcpmQtTkWS gDS50QG9DR/1As3LLLcNkwJBZzBG6PWbvcOyrwMQUF1nl4SSPV0LLH63+BrrHasfJzxKXzqg rW28CTAE2x8qi7e/6M/+XXhrsMYG+uaViM7n2je3qKe7ofum3s4vq7oFCPsOgwARAQABwsFl BBgBAgAPBQJVy5+RAhsMBQkJZgGAAAoJEE3eEPcA/4NagOsP/jPoIBb/iXVbM+fmSHOjEshl KMwEl/m5iLj3iHnHPVLBUWrXPdS7iQijJA/VLxjnFknhaS60hkUNWexDMxVVP/6lbOrs4bDZ NEWDMktAeqJaFtxackPszlcpRVkAs6Msn9tu8hlvB517pyUgvuD7ZS9gGOMmYwFQDyytpepo YApVV00P0u3AaE0Cj/o71STqGJKZxcVhPaZ+LR+UCBZOyKfEyq+ZN311VpOJZ1IvTExf+S/5 lqnciDtbO3I4Wq0ArLX1gs1q1XlXLaVaA3yVqeC8E7kOchDNinD3hJS4OX0e1gdsx/e6COvy qNg5aL5n0Kl4fcVqM0LdIhsubVs4eiNCa5XMSYpXmVi3HAuFyg9dN+x8thSwI836FoMASwOl C7tHsTjnSGufB+D7F7ZBT61BffNBBIm1KdMxcxqLUVXpBQHHlGkbwI+3Ye+nE6HmZH7IwLwV W+Ajl7oYF+jeKaH4DZFtgLYGLtZ1LDwKPjX7VAsa4Yx7S5+EBAaZGxK510MjIx6SGrZWBrrV TEvdV00F2MnQoeXKzD7O4WFbL55hhyGgfWTHwZ457iN9SgYi1JLPqWkZB0JRXIEtjd4JEQcx +8Umfre0Xt4713VxMygW0PnQt5aSQdMD58jHFxTk092mU+yIHj5LeYgvwSgZN4airXk5yRXl SE+xAvmumFBY Organization: Red Hat GmbH Message-ID: <4d3977bf-63ec-5732-b2fc-ea8654f444e3@redhat.com> Date: Mon, 4 Feb 2019 16:15:42 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <3bb397e9-d679-1152-1b42-d633682b3272@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 04 Feb 2019 15:15:53 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01.02.19 14:37, Pierre Morel wrote: > On 01/02/2019 11:56, David Hildenbrand wrote: >> On 01.02.19 10:52, Pierre Morel wrote: >>> The case when the SIE for guest3 is not setup for using >>> encryption keys nor Adjunct processor but the guest2 >>> does use these features was not properly handled. >>> >>> This leads SIE entry for guest3 to crash with validity intercept >>> because the guest2, not having the use of encryption keys nor >>> Adjunct Processor did not initialize the CRYCB designation. >>> >>> In the case where none of ECA_APIE, ECB3_AES or ECB3_DEA >>> are set in guest3 a format 0 CRYCB is allowed for guest3 >>> and the CRYCB designation in the SIE for guest3 is not checked >>> on SIE entry. >>> >>> Let's allow the CRYCD designation to be ignored when the >>> SIE for guest3 is not initialized for encryption key usage >>> nor AP. >>> >>> Fixup: d6f6959 (KVM: s390: vsie: Do the CRYCB validation first) >>> >>> Signed-off-by: Pierre Morel >>> Reported-by: Claudio Imbrenda >>> --- >>> arch/s390/kvm/vsie.c | 3 +++ >>> 1 file changed, 3 insertions(+) >>> >>> diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c >>> index a153257..a748f76 100644 >>> --- a/arch/s390/kvm/vsie.c >>> +++ b/arch/s390/kvm/vsie.c >>> @@ -300,6 +300,9 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) >>> if (!apie_h && !key_msk) >>> return 0; >>> >>> + if (!(scb_o->eca & ECA_APIE) && !(scb_o->ecb3 & (ECB3_AES | ECB3_DEA))) >>> + return 0; >>> + >>> if (!crycb_addr) >>> return set_validity_icpt(scb_s, 0x0039U); >>> >>> >> >> The original patch said >> >> "We need to handle the validity checks for the crycb, no matter what the >> settings for the keywrappings are. So lets move the keywrapping checks >> after we have done the validy checks." >> >> Can you explain why keywrapping now is important? These patches seem to >> contradict. >> > > No it does not, having the flags set or not is part of the validity check. > but, I acted too fast. > > The problem seems to be even clearer: > key_msk is defined as > int key_msk = test_kvm_facility(vcpu->kvm, 76); > > If it is defined, as it should for a mask, as > (scb_o->ecb3 & (ECB3_AES | ECB3_DEA)) > > all is clear..., key_msk is not use but for this test, so I do not > understand why it is set as facility 76. > > so I think I better do: > > > diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c > index a153257..30843a8 100644 > --- a/arch/s390/kvm/vsie.c > +++ b/arch/s390/kvm/vsie.c > @@ -289,7 +289,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, > struct vsie_page *vsie_page) > unsigned long *b1, *b2; > u8 ecb3_flags; > int apie_h; > - int key_msk = test_kvm_facility(vcpu->kvm, 76); > + int key_msk = scb_o->ecb3 & (ECB3_AES | ECB3_DEA); > int fmt_o = crycbd_o & CRYCB_FORMAT_MASK; > int fmt_h = vcpu->arch.sie_block->crycbd & CRYCB_FORMAT_MASK; > int ret = 0; > > > So just define a mask a mask. > I verify the functionality and test on Monday and if in between it > seems better to you so too I post the patch. Without documentation at hand I cannot really judge what is the right approach. You have to read the architecture description very carefully and thimk about the different scenarios. I cannot help here. test_kvm_facility(vcpu->kvm, 76) means "hardware knows key wrapping exists" scb_o->ecb3 & (ECB3_AES | ECB3_DEA) means "key wrapping was actually enabled for AES or DEA" > > Thanks, > Pierre > -- Thanks, David / dhildenb