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 7946DC32789 for ; Tue, 6 Nov 2018 12:07:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4335F20881 for ; Tue, 6 Nov 2018 12:07:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4335F20881 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 S2388306AbeKFVcS (ORCPT ); Tue, 6 Nov 2018 16:32:18 -0500 Received: from mx1.redhat.com ([209.132.183.28]:58748 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387404AbeKFVcS (ORCPT ); Tue, 6 Nov 2018 16:32:18 -0500 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 mx1.redhat.com (Postfix) with ESMTPS id DB62231256BD; Tue, 6 Nov 2018 12:07:23 +0000 (UTC) Received: from [10.36.117.33] (ovpn-117-33.ams2.redhat.com [10.36.117.33]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8A03417D5F; Tue, 6 Nov 2018 12:07:16 +0000 (UTC) Subject: Re: [PATCH v1 7/7] s390: kvm: Handle all GISA IPM bits through GISA To: Pierre Morel , borntraeger@de.ibm.com Cc: alex.williamson@redhat.com, cohuck@redhat.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, frankja@linux.ibm.com, akrowiak@linux.ibm.com, pasic@linux.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, freude@linux.ibm.com, mimu@linux.ibm.com References: <1541009577-29656-1-git-send-email-pmorel@linux.ibm.com> <1541009577-29656-8-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:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <1541009577-29656-8-git-send-email-pmorel@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 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Tue, 06 Nov 2018 12:07:24 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 31.10.18 19:12, Pierre Morel wrote: > Now that we use GISA and GIB we can handle all IPM bits from GISA > directly from firmware. > They will be interpreted on SIE entry or during guest run. > > We remove them from the pending_irqs() test. > > Signed-off-by: Pierre Morel > --- > arch/s390/kvm/interrupt.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c > index 6d0193173388..3174d9946523 100644 > --- a/arch/s390/kvm/interrupt.c > +++ b/arch/s390/kvm/interrupt.c > @@ -248,8 +248,7 @@ static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu) > > static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu) > { > - return pending_irqs_no_gisa(vcpu) | > - kvm_s390_gisa_get_ipm(vcpu->kvm->arch.gisa) << IRQ_PEND_IO_ISC_7; > + return pending_irqs_no_gisa(vcpu); > } > > static inline int isc_to_irq_type(unsigned long isc) > (only looking at this very patch with no background information, so just some notes) 1. e.g. kvm_s390_vcpu_has_irq() has to check all possible paths for pending interrupts. It uses pending_irqs(). 2. kvm_s390_deliver_pending_interrupts() delivers interrupts in the order of priority. It could be that leaving it completely to the hardware will result in some priority changes that could theoretically be observed by the guest (will have to study the GIB patches) -- Thanks, David / dhildenb