Verified the fix with reproducer described in
https://lore.kernel.org/linux-
pci/[email protected]/T/#m40d277dcdb9be64a1609a82412d1aa906263e201
using a plucky image:
qemu-system-x86_64 --enable-kvm -m 5G -cpu host \
-smp sockets=1,cores=2,threads=2 \
-snapshot -vga none -display none -nographic \
-drive if=none,file=/opt/vm/ubuntu-24.04-with-linux-net.qcow2,id=hda \
-device virtio-blk,drive=hda \
-device virtio-net,netdev=eth0,addr=03 -netdev user,id=eth0 \
-device virtio-net,netdev=eth1,addr=04 -netdev
socket,id=eth1,mcast=230.0.0.1:1234
git clone git://dpdk.org/dpdk
cd dpdk/
meson build-static --werror --default-library=static --debug
ninja -C build-static
echo 3 > /proc/sys/vm/drop_caches
echo 256 >
/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages
modprobe vfio-pci
lspci
python3 ./usertools/dpdk-devbind.py --noiommu-mode -b vfio-pci 0000:00:04.0
./build-static/app/dpdk-testpmd -l 1,2 --socket-mem 512,0 -a 0000:00:04.0 -- -i
Kernel 6.14.0-23-generic showed expected behavior, 6.14.0-24-generic
which included the faulty commit
4d4c10f763d7808fbade28d83d237411603bca05 PCI: Explicitly put devices
into D0 when initializing
reproduced the bug, while 6.14.0-27-generic with this fix included
worked fine again.
** Tags removed: verification-needed-plucky-linux
** Tags added: verification-done-plucky-linux
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https://bugs.launchpad.net/bugs/2117494
Title:
[Regression Updates] "PCI: Explicitly put devices into D0 when
initializing" breaks pci-pass-through in QEMU/KVM
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