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Mon, 6 Jun 2022 20:42:31 +0000 (GMT) Received: from [9.163.20.188] (unknown [9.163.20.188]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 6 Jun 2022 20:42:31 +0000 (GMT) Message-ID: <5a2b4f8f-14b4-cbf2-7c22-ba7bbcd4e09f@linux.ibm.com> Date: Mon, 6 Jun 2022 16:42:31 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: [PATCH v9 00/21] KVM: s390: enable zPCI for interpretive execution Content-Language: en-US From: Matthew Rosato To: 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, borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, svens@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, pbonzini@redhat.com, corbet@lwn.net, jgg@nvidia.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org References: <20220606203325.110625-1-mjrosato@linux.ibm.com> In-Reply-To: <20220606203325.110625-1-mjrosato@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: WFXtV8rQRBX5Bmwtlid3r8AwwaBWsNT_ X-Proofpoint-GUID: lyTwiG177E8ZqAOvlxnKbrvOiwU_nyNv Content-Transfer-Encoding: 7bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-06_06,2022-06-03_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxscore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 mlxlogscore=709 suspectscore=0 impostorscore=0 spamscore=0 malwarescore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2206060081 Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On 6/6/22 4:33 PM, Matthew Rosato wrote: > Enable interpretive execution of zPCI instructions + adapter interruption > forwarding for s390x KVM vfio-pci. This is done by triggering a routine > when the VFIO group is associated with the KVM guest, transmitting to > firmware a special token (GISA designation) to enable that specific guest > for interpretive execution on that zPCI device. Load/store interpreation > enablement is then controlled by userspace (based upon whether or not a > SHM bit is placed in the virtual function handle). Adapter Event > Notification interpretation is controlled from userspace via a new KVM > ioctl. > > By allowing intepretation of zPCI instructions and firmware delivery of > interrupts to guests, we can reduce the frequency of guest SIE exits for > zPCI. > > From the perspective of guest configuration, you passthrough zPCI devices > in the same manner as before, with intepretation support being used by > default if available in kernel+qemu. > > Will follow up with a link the most recent QEMU series. > Latest QEMU series: https://lore.kernel.org/kvm/20220606203614.110928-1-mjrosato@linux.ibm.com/