[Bug Report] smmuv3 event 0x10 report when running virtio-blk-pci

[Zhou Wang]

Hi All,

When I tested mainline qemu(commit 7b87a25f49), it reports smmuv3 event 0x10
during kernel booting up.

qemu command which I use is as below:

qemu-system-aarch64 -machine virt,kernel_irqchip=on,gic-version=3,iommu=smmuv3 \
-kernel Image -initrd minifs.cpio.gz \
-enable-kvm -net none -nographic -m 3G -smp 6 -cpu host \
-append 'rdinit=init console=ttyAMA0 ealycon=pl0ll,0x90000000 maxcpus=3' \
-device 
pcie-root-port,port=0x8,chassis=0,id=pci.0,bus=pcie.0,multifunction=on,addr=0x2 
\
-device pcie-root-port,port=0x9,chassis=1,id=pci.1,bus=pcie.0,addr=0x2.0x1 \
-device 
virtio-blk-pci,drive=drive0,id=virtblk0,num-queues=8,packed=on,bus=pci.1 \
-drive file=/home/boot.img,if=none,id=drive0,format=raw

smmuv3 event 0x10 log:
[...]
[    1.962656] virtio-pci 0000:02:00.0: Adding to iommu group 0
[    1.963150] virtio-pci 0000:02:00.0: enabling device (0000 -> 0002)
[    1.964707] virtio_blk virtio0: 6/0/0 default/read/poll queues
[    1.965759] virtio_blk virtio0: [vda] 2097152 512-byte logical blocks (1.07 
GB/1.00 GiB)
[    1.966934] arm-smmu-v3 9050000.smmuv3: event 0x10 received:
[    1.967442] input: gpio-keys as /devices/platform/gpio-keys/input/input0
[    1.967478] arm-smmu-v3 9050000.smmuv3:      0x0000020000000010
[    1.968381] clk: Disabling unused clocks
[    1.968677] arm-smmu-v3 9050000.smmuv3:      0x0000020000000000
[    1.968990] PM: genpd: Disabling unused power domains
[    1.969424] arm-smmu-v3 9050000.smmuv3:      0x0000000000000000
[    1.969814] ALSA device list:
[    1.970240] arm-smmu-v3 9050000.smmuv3:      0x0000000000000000
[    1.970471]   No soundcards found.
[    1.970902] arm-smmu-v3 9050000.smmuv3: event 0x10 received:
[    1.971600] arm-smmu-v3 9050000.smmuv3:      0x0000020000000010
[    1.971601] arm-smmu-v3 9050000.smmuv3:      0x0000020000000000
[    1.971601] arm-smmu-v3 9050000.smmuv3:      0x0000000000000000
[    1.971602] arm-smmu-v3 9050000.smmuv3:      0x0000000000000000
[    1.971606] arm-smmu-v3 9050000.smmuv3: event 0x10 received:
[    1.971607] arm-smmu-v3 9050000.smmuv3:      0x0000020000000010
[    1.974202] arm-smmu-v3 9050000.smmuv3:      0x0000020000000000
[    1.974634] arm-smmu-v3 9050000.smmuv3:      0x0000000000000000
[    1.975005] Freeing unused kernel memory: 10112K
[    1.975062] arm-smmu-v3 9050000.smmuv3:      0x0000000000000000
[    1.975442] Run init as init process

Another information is that if "maxcpus=3" is removed from the kernel command 
line,
it will be OK.

I am not sure if there is a bug about vsmmu. It will be very appreciated if 
anyone
know this issue or can take a look at it.

Thanks,
Zhou