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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 5 Feb 2020 18:14:45 -0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 015IEh3H60162262 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 5 Feb 2020 18:14:43 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C8352A4040; Wed, 5 Feb 2020 18:14:43 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4CF69A404D; Wed, 5 Feb 2020 18:14:43 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.26.20]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 5 Feb 2020 18:14:43 +0000 (GMT) Subject: Re: [RFCv2 16/37] KVM: s390: protvirt: Add SCLP interrupt handling To: Cornelia Huck Cc: Janosch Frank , KVM , David Hildenbrand , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , Andrea Arcangeli References: <20200203131957.383915-1-borntraeger@de.ibm.com> <20200203131957.383915-17-borntraeger@de.ibm.com> <20200205132259.75521fad.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/68.3.0 MIME-Version: 1.0 In-Reply-To: <20200205132259.75521fad.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20020518-0020-0000-0000-000003A74E50 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20020518-0021-0000-0000-000021FF1A46 Message-Id: <48348906-bded-4491-ed0a-ae5d4ba6fe80@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-05_05:2020-02-04,2020-02-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 phishscore=0 impostorscore=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=658 spamscore=0 priorityscore=1501 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002050139 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 05.02.20 13:22, Cornelia Huck wrote: > On Mon, 3 Feb 2020 08:19:36 -0500 > Christian Borntraeger wrote: > >> The sclp interrupt is kind of special. The ultravisor polices that we >> do not inject and sclp interrupt with payload if no sccb is outstanding. >> On the other hand we have "asynchronous" event interrupts, e.g. for >> console input. >> We separate both variants into sclp interrupt and sclp event interrupt. >> The sclp interrupt is masked until a previous servc instruction has >> finished (sie exit 108). >> >> Signed-off-by: Christian Borntraeger >> --- >> arch/s390/include/asm/kvm_host.h | 6 ++- >> arch/s390/kvm/intercept.c | 25 +++++++++ >> arch/s390/kvm/interrupt.c | 92 ++++++++++++++++++++++++++------ >> arch/s390/kvm/kvm-s390.c | 2 + >> 4 files changed, 108 insertions(+), 17 deletions(-) >> > >> diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c >> index 4b3fbbde1674..c22214967214 100644 >> --- a/arch/s390/kvm/intercept.c >> +++ b/arch/s390/kvm/intercept.c >> @@ -444,8 +444,33 @@ static int handle_operexc(struct kvm_vcpu *vcpu) >> return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); >> } >> >> +static int handle_pv_sclp(struct kvm_vcpu *vcpu) >> +{ >> + struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int; >> + >> + spin_lock(&fi->lock); >> + /* >> + * 2 cases: >> + * a: an sccb answering interrupt was already pending or in flight. >> + * As the sccb value is not used we can simply set some more bits >> + * and make sure that we deliver something > > The sccb value is not used because the firmware handles this? Yes, the firmware will use its copy of the sccb value when we have something !=0 > >> + * b: an error sccb interrupt needs to be injected so we also inject >> + * something and let firmware do the right thing. >> + * This makes sure, that both errors and real sccb returns will only >> + * be delivered when we are unmasked. > > What makes this sure? That we only unmask here? Yes, we unmask here at a notification intercept (instruction is complete).. I will use: /* * 2 cases: * a: an sccb answering interrupt was already pending or in flight. * As the sccb value is not known we can simply set some value to * trigger delivery of a saved SCCB. UV will then use its saved * copy of the SCCB value. * b: an error SCCB interrupt needs to be injected so we also inject * a fake SCCB address. Firmware will use the proper one. * This makes sure, that both errors and real sccb returns will only * be delivered after a notification intercept (instruction has * finished) but not after others. */