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=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 791C5C65BA7 for ; Fri, 5 Oct 2018 07:54:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A91E2064D for ; Fri, 5 Oct 2018 07:54:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3A91E2064D 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 S1727981AbeJEOvr (ORCPT ); Fri, 5 Oct 2018 10:51:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:22374 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727354AbeJEOvq (ORCPT ); Fri, 5 Oct 2018 10:51:46 -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 mx1.redhat.com (Postfix) with ESMTPS id 91099804F3; Fri, 5 Oct 2018 07:54:13 +0000 (UTC) Received: from [10.36.116.131] (ovpn-116-131.ams2.redhat.com [10.36.116.131]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6B65D1853C; Fri, 5 Oct 2018 07:54:11 +0000 (UTC) Subject: Re: [PATCH] s390: vfio-ap: trace the update of APCB masks To: Cornelia Huck , Pierre Morel Cc: borntraeger@de.ibm.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 References: <1538724781-31852-1-git-send-email-pmorel@linux.ibm.com> <20181005095058.0af1555f.cohuck@redhat.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/60.0 MIME-Version: 1.0 In-Reply-To: <20181005095058.0af1555f.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Fri, 05 Oct 2018 07:54:13 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/10/2018 09:50, Cornelia Huck wrote: > On Fri, 5 Oct 2018 09:33:01 +0200 > Pierre Morel wrote: > >> Define a tracing function to trace in the KVM trace buffer >> and trace the changes of the APCB masks. > > In general, trace events are good :) > >> >> Signed-off-by: Pierre Morel >> --- >> drivers/s390/crypto/vfio_ap_ops.c | 22 ++++++++++++++++++++++ >> drivers/s390/crypto/vfio_ap_private.h | 4 ++++ >> 2 files changed, 26 insertions(+) >> >> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c >> index a8a9984..00e632a 100644 >> --- a/drivers/s390/crypto/vfio_ap_ops.c >> +++ b/drivers/s390/crypto/vfio_ap_ops.c >> @@ -753,6 +753,28 @@ static void vfio_ap_mdev_copy_masks(struct ap_matrix_mdev *matrix_mdev) >> memcpy(aqm, matrix_mdev->matrix.aqm, nbytes); >> nbytes = DIV_ROUND_UP(matrix_mdev->matrix.adm_max + 1, BITS_PER_BYTE); >> memcpy(adm, matrix_mdev->matrix.adm, nbytes); >> + >> + switch (matrix_mdev->kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) { >> + case CRYCB_FORMAT2: >> + VM_AP_EVENT(matrix_mdev->kvm, 3, >> + "SET CRYCB: apm %016lx %016lx %016lx %016lx", >> + apm[0], apm[1], apm[2], apm[3]); >> + VM_AP_EVENT(matrix_mdev->kvm, 3, >> + "SET CRYCB: aqm %016lx %016lx %016lx %016lx", >> + aqm[0], aqm[1], aqm[2], aqm[3]); >> + VM_AP_EVENT(matrix_mdev->kvm, 3, >> + "SET CRYCB: adm %016lx %016lx %016lx %016lx", >> + adm[0], adm[1], adm[2], adm[3]); >> + break; >> + case CRYCB_FORMAT1: >> + case CRYCB_FORMAT0: /* Both CRYCB format uses APCB format 0 */ >> + default: /* Can not happen */ > > If it can't happen, trace "SET CRYCB: invalid format '%x'" instead? > >> + VM_AP_EVENT(matrix_mdev->kvm, 3, >> + "SET CRYCB: apm %016lx aqm %04x adm %04x", apm[0], >> + *((unsigned short *)aqm), *((unsigned short *)adm)); >> + break; >> + } >> + >> } >> >> /** >> diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h >> index 5675492..4cd779d 100644 >> --- a/drivers/s390/crypto/vfio_ap_private.h >> +++ b/drivers/s390/crypto/vfio_ap_private.h >> @@ -19,6 +19,10 @@ >> >> #include "ap_bus.h" >> >> +#define VM_AP_EVENT(d_kvm, d_loglevel, d_string, d_args...)\ >> + debug_sprintf_event(d_kvm->arch.dbf, d_loglevel, d_string "\n", \ >> + d_args) >> + >> #define VFIO_AP_MODULE_NAME "vfio_ap" >> #define VFIO_AP_DRV_NAME "vfio_ap" >> > > One thing I don't like about this is that you're using the kvm dbf from > driver code, which looks odd. OTOH, these are kvm-specific masks... Maybe factor out the setting of the actual masks to KVM code and do tracing there? > > Is there anything else that you may want to trace in the vfio-ap > driver, so that you could add a dbf for it? > -- Thanks, David / dhildenb