On x86 this looks pretty similar and at the place we have seen before:
45397 0.000073 readlink("/sys/bus/pci/devices/0000:21:00.1/iommu_group",
"../../../../kernel/iommu_groups/"..., 4096) = 34 <0.000020>
45397 0.000053 openat(AT_FDCWD, "/dev/vfio/45", O_RDWR|O_CLOEXEC) = 31
<0.000033>
45397 0.000060 ioctl(31, VFIO_GROUP_GET_STATUS, 0x7ffd774f80f8) = 0
<0.000015>
45397 0.000041 openat(AT_FDCWD, "/dev/vfio/vfio", O_RDWR|O_CLOEXEC) = 32
<0.000019>
45397 0.000046 ioctl(32, VFIO_GET_API_VERSION, 0x80002) = 0 <0.000011>
45397 0.000038 ioctl(32, VFIO_CHECK_EXTENSION, 0x3) = 1 <0.000012>
45397 0.000035 ioctl(31, VFIO_GROUP_SET_CONTAINER, 0x55758e6acec8) = 0
<0.000011>
45397 0.000033 ioctl(32, VFIO_SET_IOMMU, 0x3) = 0 <0.000174>
45397 0.000199 ioctl(32, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO or
VFIO_IOMMU_GET_INFO or VFIO_IOMMU_SPAPR_TCE_GET_INFO, 0x7ffd774f8100) = 0
<0.000012>
45397 0.000038 ioctl(14, KVM_CREATE_DEVICE, 0x7ffd774f8094) = 0 <0.000015>
45397 0.000039 ioctl(33, KVM_SET_DEVICE_ATTR, 0x7ffd774f80a0) = 0
<0.000028>
45397 0.000054 ioctl(32, VFIO_DEVICE_PCI_HOT_RESET or VFIO_IOMMU_MAP_DMA,
0x7ffd774f7f20) = 0 <0.000287>
45397 0.000312 ioctl(32, VFIO_DEVICE_PCI_HOT_RESET or VFIO_IOMMU_MAP_DMA,
0x7ffd774f7f20) = 0 <0.000035>
45397 0.000058 ioctl(32, VFIO_DEVICE_PCI_HOT_RESET or VFIO_IOMMU_MAP_DMA,
0x7ffd774f7f20) = 0 <0.000037>
45397 0.000060 ioctl(32, VFIO_DEVICE_PCI_HOT_RESET or VFIO_IOMMU_MAP_DMA,
0x7ffd774f7f20) = 0 <0.334458>
45397 0.334593 ioctl(32, VFIO_DEVICE_PCI_HOT_RESET or VFIO_IOMMU_MAP_DMA,
0x7ffd774f7f20) = 0 <0.000055>
45397 0.000088 ioctl(32, VFIO_DEVICE_PCI_HOT_RESET or VFIO_IOMMU_MAP_DMA
<unfinished ...>
45402 9.654538 <... futex resumed> ) = -1 ETIMEDOUT (Connection timed out)
<10.000112>
45402 0.000144 madvise(0x7fd51236f000, 8368128, MADV_DONTNEED) = 0
<0.000036>
45402 0.000076 exit(0) = ?
45402 0.000074 +++ exited with 0 +++
45397 45.903415 <... ioctl resumed> , 0x7ffd774f7f20) = 0 <55.558237>
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1838575
Title:
passthrough devices cause >17min boot delay
Status in linux package in Ubuntu:
Confirmed
Status in qemu package in Ubuntu:
Incomplete
Bug description:
Adding passthrough devices to a guest introduces a boot delay of > 17
minutes. During this time libvirt reports the guest to be "paused".
The delay does not seem to scale with the # of hostdevs - that is, 1
hostdev causes about a 17min delay, while 16 only bumps that up to
~18min. Removing all hostdevs avoids the delay.
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