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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 3B053C4321D for ; Thu, 23 Aug 2018 07:15:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C3234208A6 for ; Thu, 23 Aug 2018 07:15:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C3234208A6 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726507AbeHWKnf (ORCPT ); Thu, 23 Aug 2018 06:43:35 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:36174 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726068AbeHWKnf (ORCPT ); Thu, 23 Aug 2018 06:43:35 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 13C797A7E7; Thu, 23 Aug 2018 07:15:20 +0000 (UTC) Received: from [10.36.117.65] (ovpn-117-65.ams2.redhat.com [10.36.117.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0E56FA9EE7; Thu, 23 Aug 2018 07:15:17 +0000 (UTC) Subject: Re: [PATCH v2 3/5] KVM: s390: vsie: Allow support for a host without AP To: pmorel@linux.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, borntraeger@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com References: <1534956717-14087-1-git-send-email-pmorel@linux.ibm.com> <1534956717-14087-4-git-send-email-pmorel@linux.ibm.com> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 23 Aug 2018 07:15:20 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Thu, 23 Aug 2018 07:15:20 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'david@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23.08.2018 08:44, Pierre Morel wrote: > On 22/08/2018 19:06, David Hildenbrand wrote: >> On 22.08.2018 18:51, Pierre Morel wrote: >>> Currently the CRYCB format used in the host for the >>> shadowed CRYCB is FORMAT2 while no check is done if >>> AP instructions are supported in the host. >>> >>> We better use the format the host calculated for the >>> guest 1 as the host already tested it against its >>> facility set. >>> >>> Signed-off-by: Pierre Morel >>> --- >>> arch/s390/kvm/vsie.c | 5 +++-- >>> 1 file changed, 3 insertions(+), 2 deletions(-) >>> >>> diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c >>> index 56a9d47..0b12916 100644 >>> --- a/arch/s390/kvm/vsie.c >>> +++ b/arch/s390/kvm/vsie.c >>> @@ -154,6 +154,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) >>> const u32 crycb_addr = crycbd_o & 0x7ffffff8U; >>> unsigned long *b1, *b2; >>> u8 ecb3_flags; >>> + unsigned long g1_fmt; >>> >>> scb_s->crycbd = 0; >>> if (!(crycbd_o == CRYCB_FORMAT1)) >>> @@ -180,8 +181,8 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) >>> return set_validity_icpt(scb_s, 0x0035U); >>> >>> scb_s->ecb3 |= ecb3_flags; >>> - scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT1 | >>> - CRYCB_FORMAT2; >>> + g1_fmt = vcpu->arch.sie_block->crycbd & 0x03; >>> + scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | g1_fmt; >>> >>> /* xor both blocks in one run */ >>> b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask; >>> >> >> This is wrong. I remember that with APXA, if FORMAT2 is available, we >> should always use FORMAT2. That's why we explicitly convert it here. >> > > You are right if FORMAT2 is available we should use FORMAT2 > but the intention here is to use what KVM crypto init function did, > assuming it did the right thing. > > Eventually we are running on a host without AP and we should use FORMAT1. > > Isn't it correct? Yes and no :) No APXA -> FORMAT2 bit is ignored (and that is one of the reasons why I am being so strict about simulating HW behavior correctly in nested code :) ) This only holds as long as we are not using AP. Because from a MSA3 perspective, FORMAT1==FORMAT2 (apart from the length/alignment, which is fine for us). Once we support AP (via ECA.28), we'll properly have to create either a Format0/Format1/Format2. Then, there is actually a semantically difference ("different fields used"). > > Regards, > Pierre > > -- Thanks, David / dhildenb