Re: Possible io_uring regression with QEMU on Ubuntu's kernel

2021-07-01 Thread Kamal Mostafa
Hi- Thanks very much for reporting this. We picked up that patch ("io_uring: don't mark S_ISBLK async work as unbounded") for our Ubuntu v5.8 kernel from linux-stable/v5.10.31. Since it's not clear that it's appropriate for v5.8 (or even v5.10-stable?) we'll revert it from Ubuntu v5.8 if you can

Re: Possible io_uring regression with QEMU on Ubuntu's kernel

2021-07-01 Thread Juhyung Park
Hi Kamal. Thanks for the timely response. We currently worked around the issue by installing linux-generic-hwe-20.04-edge. I've just installed the new build that you provided but I'm afraid the same issue persists. I've double-checked that the kernel is installed properly: root@datai-ampere:~# u

Possible io_uring regression with QEMU on Ubuntu's kernel

2021-06-30 Thread Juhyung Park
Hi everyone. With the latest Ubuntu 20.04's HWE kernel 5.8.0-59, I'm noticing some weirdness when using QEMU/libvirt with the following storage configuration: QEMU version is 5.2+dfsg-9ubuntu3 and libvirt version is 7.0.0-2ubuntu2. The guest VM is unable to handle I/O proper