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Mon, 6 Apr 2026 18:24:23 +0000 (GMT) Message-ID: <20708f8c-546d-44bf-ab3a-b9bd59614031@linux.ibm.com> Date: Mon, 6 Apr 2026 14:24:23 -0400 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 v3 3/3] KVM: s390: Introducing kvm_arch_set_irq_inatomic fast inject To: Sean Christopherson Cc: Douglas Freimuth , borntraeger@linux.ibm.com, imbrenda@linux.ibm.com, frankja@linux.ibm.com, david@kernel.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260406064419.14384-1-freimuth@linux.ibm.com> <20260406064419.14384-4-freimuth@linux.ibm.com> <0b9c451f-0167-4f1b-a38e-6413cf089c18@linux.ibm.com> Content-Language: en-US From: Matthew Rosato In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: ay5hpSrBLkPLAdA4ftpOybxlk2k3k-ok X-Proofpoint-GUID: 7eTo9i71uvBZk6hUU6FuuhGHyR5QCI5l X-Authority-Analysis: v=2.4 cv=U9qfzOru c=1 sm=1 tr=0 ts=69d3fa5a cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=a9-v2Dun1yPnsuJwnBcA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA2MDE3OSBTYWx0ZWRfX5RrI0qIhe1/R Rb/iSbPt2j8w9HTGFGu2ylS+PSOXAkfcbQnhDxko4j2f5bzJENGIXIlLroVOG3Gf+xqF7JAU5Vk MFUNRFVmOU5qqXvPHBf6aBUUdjBwTd7haDhowrjZWwF/CMJTzxI8JF2rPbp4zcPn3DXm5QyRtP/ c81wP3ZQ7NegJSYvbQ11mee7cUd6nECl/G32jXwxfUo3AXnv6ELo5t+U4lFIVu0i7FSSmJXrUoq ORnTLs8mx4l200C/ErGyPShSiClY3aE3c04zIwK9i3IBcqCQTcwMiTI7IFZXyfqCPu/JyxDqxA8 zlqvpf2o4eayG58apqTqGFtT59DoW4piVTRL3yzwJwoOnWInGzdLWSZwhpWxTNEenFSu+I44Nnk iSrL/2ihdhv3zwuw58hTCEUF9XuXs5Yd2XXUl3h7dVeYhYzjFMTu6LMKDA6bEwu/802LhXpQfJu ufVd8u8pliU5f8yuX7g== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-06_03,2026-04-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 malwarescore=0 clxscore=1015 adultscore=0 suspectscore=0 spamscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604060179 >> >> Sashiko complains about PREEMPT_RT kernels and spinlocks being sleepable >> in this case which would break the whole point of kvm_arch_set_irq_inatomic. > > Just make it a raw spinlock so that it stays an actual spinlock. [...] > > s390 should use a raw spinlock, same as arm64 and RISC-V. Ahh, I missed that subtlety. Thanks for the explanation!