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Mon, 3 Aug 2026 06:58:02 +0000 (GMT) From: Madhavan Srinivasan To: Vishal Chourasia Cc: peterz@infradead.org, frederic@kernel.org, npiggin@gmail.com, mpe@ellerman.id.au, chleroy@kernel.org, sshegde@linux.ibm.com, amachhiw@linux.ibm.com, vaibhav@linux.ibm.com, harshpb@linux.ibm.com, gautam@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 0/2] KVM: powerpc: Use generic xfer to guest work function Date: Mon, 3 Aug 2026 12:28:02 +0530 Message-ID: <178574013459.29744.14268082002008456960.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260709092140.1753715-2-vishalc@linux.ibm.com> References: <20260709092140.1753715-2-vishalc@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODAzMDA1OCBTYWx0ZWRfX8ffrc5J4nAHK vH0+Q9XBCLdiegmcOYxvyyKNnvUxCP2KvqsQ3vz8AobgUwn0UdWI4ktqo85no3m5pIAi858QWg2 ca3jDyRpGZdhxwpthZznO3ZSKNREhC4ReXx0xmg6aYa8AvX1m+P+IBHBnh7uhNJNI8hYqBnGKon X3UuoW1siD9hmJ4qFzlOKY8vS5IQ77U04IS9T5VaesQ8KIA9ecOGd5ts1hYufo/tr+8mDK/MO/M kRr5aL1pyhkB8iqmHXgAZ+LRYhzIoe6V4Bwhg8FMRUMW4srptT2OsiQBAslfiNym3cDok7aSmsp fvFNfg+nwMMqtq2YgAH87SexYcsN9g4XK3YcM9NBW02N4/Kaw2b5UO3Yuo3czZKIdGBtPdaXFam zs8ulExvMjBXyCnVfvgCBPRlEsZkhwwTApzcl1L8ESQRbIW+X2JJRn/WZu+CRxij2iatMYcrHO1 VlZT70Qfvi5/ct6gMsA== X-Authority-Analysis: v=2.4 cv=WIFPmHsR c=1 sm=1 tr=0 ts=6a703c02 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=HOfZ0xPUYLTITXtUa5IA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: Vyf5O9lbPYgGCKingTMYhlKUBhx8kaK9 X-Proofpoint-ORIG-GUID: rRkzfVMjvXWlizzBobUaxG7SB7_HjGwC X-Proofpoint-Spam-Info: AW1haW4tMjYwODAzMDA1OCBTYWx0ZWRfXx5gDHJcZnTEF PCGE9pTuihnUSK3oXlAa6BGMTECBz5mLP8zhy2kgLO280TE/YgfyTnsDyLy8jInMYhTdlSioHOz 9J492Z4c4oK2+kKqOmFLWY7AyN5c+UE= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-02_06,2026-07-30_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 malwarescore=0 suspectscore=0 clxscore=1015 impostorscore=0 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608030058 On Thu, 09 Jul 2026 14:51:38 +0530, Vishal Chourasia wrote: > This series fixes a KVM scheduling bug on Book3S HV where a guest VM > under a cpu.max bandwidth limit can run arbitrarily past its quota and > then appear frozen for minutes afterwards. > > == Problem == > > Since commit 2cd571245b43 ("sched/fair: Add related data structure for > task based throttle"), merged in v6.18, CFS bandwidth throttling no > longer dequeues a task directly. Instead it queues a task_work item via > task_work_add(..., TWA_RESUME), sets TIF_NOTIFY_RESUME, and relies on > that work running on the return path to actually dequeue the task. > > [...] Applied to powerpc/next. [1/2] KVM: powerpc: Use generic xfer to guest work function https://git.kernel.org/powerpc/c/12013e3d4695721ef83b2e32fdfd20e2eb9b0cc9 [2/2] powerpc: enable to run posix cpu timers in task context https://git.kernel.org/powerpc/c/c2c8844316a12c2e1a3314e4f021815dd7fc7b47 cheers