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Thu, 16 Jan 2020 08:18:11 -0500 X-MC-Unique: GUX1q-dHMN-A_cN94iDuEQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 289B31902EB6; Thu, 16 Jan 2020 13:18:10 +0000 (UTC) Received: from [10.36.116.136] (ovpn-116-136.ams2.redhat.com [10.36.116.136]) by smtp.corp.redhat.com (Postfix) with ESMTP id C2AD56106F; Thu, 16 Jan 2020 13:18:06 +0000 (UTC) Subject: Re: [kvm-unit-tests PATCH v2 6/7] s390x: smp: Test all CRs on initial reset To: Janosch Frank , kvm@vger.kernel.org Cc: thuth@redhat.com, borntraeger@de.ibm.com, linux-s390@vger.kernel.org, cohuck@redhat.com References: <20200116120513.2244-1-frankja@linux.ibm.com> <20200116120513.2244-7-frankja@linux.ibm.com> <7e85ec92-4d0a-f673-00c8-a9ab9a22118c@redhat.com> <400dc0d2-86bc-cdc8-ec8a-7d1148ebd5fa@linux.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 In-Reply-To: <400dc0d2-86bc-cdc8-ec8a-7d1148ebd5fa@linux.ibm.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 16.01.20 14:07, Janosch Frank wrote: > On 1/16/20 1:24 PM, David Hildenbrand wrote: >> On 16.01.20 13:05, Janosch Frank wrote: >>> All CRs are set to 0 and CRs 0 and 14 are set to pre-defined values, >>> so we also need to test 1-13 and 15 for 0. >>> >>> And while we're at it, let's also set some values to cr 1, 7 and 13, so >>> we can actually be sure that they will be zeroed. >>> >>> Signed-off-by: Janosch Frank >>> --- >>> s390x/smp.c | 19 ++++++++++++++++++- >>> 1 file changed, 18 insertions(+), 1 deletion(-) >>> >>> diff --git a/s390x/smp.c b/s390x/smp.c >>> index d430638..ce3215d 100644 >>> --- a/s390x/smp.c >>> +++ b/s390x/smp.c >>> @@ -176,16 +176,31 @@ static void test_emcall(void) >>> report_prefix_pop(); >>> } >>> >>> +/* Used to dirty registers of cpu #1 before it is reset */ >>> +static void test_func_initial(void) >>> +{ >>> + lctlg(1, 0x42000UL); >>> + lctlg(7, 0x43000UL); >>> + lctlg(13, 0x44000UL); >>> + testflag = 1; >>> + mb(); >>> + cpu_loop(); >> >> Can we make cpu_loop() the default when this function returns? (IOW, an >> endless loop whenever a cpu finished executing the function?) > > So adding it to cstart64.S after the br 14? Yes I think so. > >> >> Do we need the mb() here? > > Would the compiler reorder the lctlcg and testflag if it could? lctlg() does not have a "memory" constraint, so I guess it would be valid if it would reorder. I assume the mb() would have to be moved in front of the testflag=1? -- Thanks, David / dhildenb