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Tue, 05 May 2020 07:55:39 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 0457sRRE53281152 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 5 May 2020 07:54:27 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CBF0BAE04D; Tue, 5 May 2020 07:55:36 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5DEB6AE045; Tue, 5 May 2020 07:55:36 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.49.139]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 5 May 2020 07:55:36 +0000 (GMT) Subject: Re: [PATCH] KVM: s390: Remove false WARN_ON_ONCE for the PQAP instruction To: Cornelia Huck Cc: Janosch Frank , KVM , David Hildenbrand , linux-s390 , Qian Cai , Pierre Morel , Tony Krowiak References: <20200505073525.2287-1-borntraeger@de.ibm.com> <20200505095332.528254e5.cohuck@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200505095332.528254e5.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-05-05_03:2020-05-04,2020-05-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 spamscore=0 impostorscore=0 mlxscore=0 adultscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005050057 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 05.05.20 09:53, Cornelia Huck wrote: > On Tue, 5 May 2020 09:35:25 +0200 > Christian Borntraeger wrote: > >> In LPAR we will only get an intercept for FC==3 for the PQAP >> instruction. Running nested under z/VM can result in other intercepts as >> well, for example PQAP(QCI). So the WARN_ON_ONCE is not right. Let >> us simply remove it. > > While I agree with removing the WARN_ON_ONCE, I'm wondering why z/VM > gives us intercepts for those fcs... is that just a result of nesting > (or the z/VM implementation), or is there anything we might want to do? Yes nesting. The ECA bit for interpretion is an effective one. So if the ECA bit is off in z/VM (no crypto cards) our ECA bit is basically ignored as these bits are ANDed. I asked Tony to ask the z/VM team if that is the case here. > >> >> Cc: Pierre Morel >> Cc: Tony Krowiak >> Reported-by: Qian Cai >> Signed-off-by: Christian Borntraeger >> --- >> arch/s390/kvm/priv.c | 4 +++- >> 1 file changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c >> index 69a824f9ef0b..bbe46c6aedbf 100644 >> --- a/arch/s390/kvm/priv.c >> +++ b/arch/s390/kvm/priv.c >> @@ -626,10 +626,12 @@ static int handle_pqap(struct kvm_vcpu *vcpu) >> * available for the guest are AQIC and TAPQ with the t bit set >> * since we do not set IC.3 (FIII) we currently will only intercept >> * the AQIC function code. >> + * Note: running nested under z/VM can result in intercepts, e.g. > > s/intercepts/intercepts for other function codes/ > >> + * for PQAP(QCI). We do not support this and bail out. >> */ >> reg0 = vcpu->run->s.regs.gprs[0]; >> fc = (reg0 >> 24) & 0xff; >> - if (WARN_ON_ONCE(fc != 0x03)) >> + if (fc != 0x03) >> return -EOPNOTSUPP; >> >> /* PQAP instruction is allowed for guest kernel only */ >