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Fri, 17 Jan 2025 12:42:05 +0000 (GMT) Message-ID: <99bc2df0-ffd2-4aaa-b658-de5ac3a77b40@linux.ibm.com> Date: Fri, 17 Jan 2025 07:42:04 -0500 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1] s390/vfio-ap: Signal eventfd when guest AP configuration is changed To: freude@linux.ibm.com Cc: Rorie Reyes , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, hca@linux.ibm.com, borntraeger@de.ibm.com, agordeev@linux.ibm.com, gor@linux.ibm.com, pasic@linux.ibm.com, jjherne@linux.ibm.com, alex.williamson@redhat.com References: <20250107183645.90082-1-rreyes@linux.ibm.com> <45d553cd050334029a6d768dc6639433@linux.ibm.com> <105ff0df576ac86c1cd2edd4e1a6478c@linux.ibm.com> Content-Language: en-US From: Anthony Krowiak In-Reply-To: <105ff0df576ac86c1cd2edd4e1a6478c@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: EPHsWAj3XFcK4PFZ8T_OumlNyaUKoIxz X-Proofpoint-GUID: EPHsWAj3XFcK4PFZ8T_OumlNyaUKoIxz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-17_05,2025-01-16_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=999 priorityscore=1501 malwarescore=0 mlxscore=0 suspectscore=0 bulkscore=0 spamscore=0 impostorscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501170100 On 1/17/25 3:30 AM, Harald Freudenberger wrote: > On 2025-01-16 17:46, Anthony Krowiak wrote: >>> >>> Rorie, this is to inform listeners on the host of the guest. >>> The guest itself already sees this "inside" with uevents triggered >>> by the AP bus code. >>> >>> Do you have a consumer for these events? >> >> There is a series of QEMU patches that register a notification >> handler for this >> event. When that handler gets called, it generates and queues a CRW >> to the guest >> indicating there is event information pending which will cause the AP >> bus driver >> to get notified of the AP configuration change via its ap_bus_cfg_chg >> notifier call. >> >> The QEMU series can be seen at: >> https://lore.kernel.org/qemu-devel/7171c479-5cb4-4748-ba37-da4cf2fac35b@linux.ibm.com/T/ >> >> >> >> Kind regards, >> A Krowiak > > Ok, so this way the AP bus of the guest finally get's it's config > change callback invoked :-) Yes, and it happens pretty quickly; at least in the test environment.