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Fri, 17 Dec 2021 15:19:02 +0000 (GMT) Message-ID: Date: Fri, 17 Dec 2021 10:19:01 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Subject: Re: [PATCH 16/32] KVM: s390: expose the guest zPCI interpretation facility Content-Language: en-US To: Christian Borntraeger , linux-s390@vger.kernel.org Cc: alex.williamson@redhat.com, cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com, pmorel@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com, vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20211207205743.150299-1-mjrosato@linux.ibm.com> <20211207205743.150299-17-mjrosato@linux.ibm.com> <23ee6e80-b857-11ab-1d80-c8b1f4ff6f04@linux.ibm.com> From: Matthew Rosato In-Reply-To: <23ee6e80-b857-11ab-1d80-c8b1f4ff6f04@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 1Qt-TK5IIhz3iqrFs_Hock8DMrn_5rHx X-Proofpoint-GUID: xrYnc8mY-vB6ZjuDRqwRaDG3FxoMAjoh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-17_05,2021-12-16_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 phishscore=0 impostorscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 bulkscore=0 priorityscore=1501 clxscore=1015 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112170088 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/17/21 10:05 AM, Christian Borntraeger wrote: > > > Am 07.12.21 um 21:57 schrieb Matthew Rosato: >> This facility will be used to enable interpretive execution of zPCI >> instructions. >> >> Signed-off-by: Matthew Rosato >> --- >>   arch/s390/kvm/kvm-s390.c | 4 ++++ >>   1 file changed, 4 insertions(+) >> >> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c >> index c8fe9b7c2395..09991d05c871 100644 >> --- a/arch/s390/kvm/kvm-s390.c >> +++ b/arch/s390/kvm/kvm-s390.c >> @@ -2751,6 +2751,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned >> long type) >>           set_kvm_facility(kvm->arch.model.fac_mask, 147); >>           set_kvm_facility(kvm->arch.model.fac_list, 147); >>       } >> +    if (sclp.has_zpci_interp && test_facility(69)) { >> +        set_kvm_facility(kvm->arch.model.fac_mask, 69); >> +        set_kvm_facility(kvm->arch.model.fac_list, 69); >> +    } > > > Do we need the setting of these stfle bits somewhere? I think QEMU sets > them as well for the guest. > We only need this when the kernel probes for this (test_kvm_facility) > But then the question is, shouldnt > we then simply check for sclp bits in those places? > See also patch 19. We need to build it in a way that allows VSIE support > later on. > Right, so this currently sets the facility bits but we don't set the associated guest SCLP bits. I guess since we are not enabling for VSIE now it would make sense to not set either. So then just to confirm we are on the same page: I will drop these patches 16-18 and leave the kvm facilities unset until we wish to enable VSIE. And then also make sure we are checking sclp bits (e.g. patch 19). OK? >>       if (css_general_characteristics.aiv && test_facility(65)) >>           set_kvm_facility(kvm->arch.model.fac_mask, 65); >>