On Jul 26 15:55, Jinhao Fan wrote: > at 3:41 PM, Klaus Jensen <i...@irrelevant.dk> wrote: > > > On Jul 26 15:35, Jinhao Fan wrote: > >> at 4:55 AM, Klaus Jensen <i...@irrelevant.dk> wrote: > >> > >>> We have a regression following this patch that we need to address. > >>> > >>> With this patch, issuing a reset on the device (`nvme reset /dev/nvme0` > >>> will do the trick) causes QEMU to hog my host cpu at 100%. > >>> > >>> I'm still not sure what causes this. The trace output is a bit > >>> inconclusive still. > >>> > >>> I'll keep looking into it. > >> > >> I cannot reproduce this bug. I just start the VM and used `nvme reset > >> /dev/nvme0`. Did you do anything before the reset? > > > > Interesting and thanks for checking! Looks like a kernel issue then! > > > > I remember that I'm using a dev branch (nvme-v5.20) of the kernel and > > reverting to a stock OS kernel did not produce the bug. > > I’m using 5.19-rc4 which I pulled from linux-next on Jul 1. It works ok on > my machine.
Interesting. I can reproduce on 5.19-rc4 from torvalds tree. Can you drop your qemu command line here? This is mine. /home/kbj/work/src/qemu/build/x86_64-softmmu/qemu-system-x86_64 \ -nodefaults \ -display "none" \ -machine "q35,accel=kvm,kernel-irqchip=split" \ -cpu "host" \ -smp "4" \ -m "8G" \ -device "intel-iommu" \ -netdev "user,id=net0,hostfwd=tcp::2222-:22" \ -device "virtio-net-pci,netdev=net0" \ -device "virtio-rng-pci" \ -drive "id=boot,file=/home/kbj/work/vol/machines/img/nvme.qcow2,format=qcow2,if=virtio,discard=unmap,media=disk,read-only=no" \ -device "pcie-root-port,id=pcie_root_port1,chassis=1,slot=0" \ -device "nvme,id=nvme0,serial=deadbeef,bus=pcie_root_port1,mdts=7" \ -drive "id=null,if=none,file=null-co://,file.read-zeroes=on,format=raw" \ -device "nvme-ns,id=nvm-1,drive=nvm-1,bus=nvme0,nsid=1,drive=null,logical_block_size=4096,physical_block_size=4096" \ -pidfile "/home/kbj/work/vol/machines/run/null/pidfile" \ -kernel "/home/kbj/work/src/kernel/linux/arch/x86_64/boot/bzImage" \ -append "root=/dev/vda1 console=ttyS0,115200 audit=0 intel_iommu=on" \ -virtfs "local,path=/home/kbj/work/src/kernel/linux,security_model=none,readonly=on,mount_tag=kernel_dir" \ -serial "mon:stdio" \ -d "guest_errors" \ -D "/home/kbj/work/vol/machines/log/null/qemu.log" \ -trace "pci_nvme*"
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