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when assigning devices using VFIO allows the guest to have direct access to the device of nvme, nvme0: I/O tag 4 (0004) QID 0 timeout #13
Description
When SR-IOV capable NVMe PCIe device is passed through to the guest vm using lkvm VFIO functionality (--vfio-pci), "nvme0: I/O tag 4 (0004) QID 0 timeout" is observed.
the following is lkvm cmds and logs.
- lkvm cmd
lkvm run -m 512 -c1 --console serial -p "console=ttyS0 earlycon" -k Image -d rootfs.ext2 --vfio-pci 0000:00:01.1- log
# lspci -v
00:00.0 Non-Volatile memory controller: Red Hat, Inc. QEMU NVM Express Controller (rev 02) (prog-if 02 [NVM Express])
Subsystem: Red Hat, Inc. Device 1100
Flags: fast devsel
Memory at 40000000 (32-bit, non-prefetchable) [size=16K]
Capabilities: [40] MSI-X: Enable- Count=1 Masked-
Capabilities: [80] Express Root Complex Integrated Endpoint, MSI 00- kernel log
[ 1.527082] pci 0000:00:00.0: BAR 0 [mem 0x40000000-0x40003fff]: assigned
[ 1.533870] pci 0000:00:01.0: BAR 2 [mem 0x40004000-0x400043ff]: assigned
[ 1.541026] pci 0000:00:02.0: BAR 2 [mem 0x40004400-0x400047ff]: assigned
[ 1.547329] pci 0000:00:01.0: BAR 0 [io 0x0100-0x01ff]: assigned
[ 1.553120] pci 0000:00:01.0: BAR 1 [mem 0x40004800-0x400048ff]: assigned
[ 1.559346] pci 0000:00:02.0: BAR 0 [io 0x0200-0x02ff]: assigned
[ 1.566536] pci 0000:00:02.0: BAR 1 [mem 0x40004900-0x400049ff]: assigned
[ 1.586236] nvme nvme0: pci function 0000:00:00.0
[ 1.771708] nvme nvme0: failed to register the CMB
[ 62.601763] nvme nvme0: I/O tag 4 (0004) QID 0 timeout, disable controller
[ 62.614979] nvme nvme0: Identify Controller failed (-4)
[ 62.633939] nvme 0000:00:00.0: probe with driver nvme failed with error -5But save device behavaves correctly using qemu utils.
The following is logs.
00:01.0 Non-Volatile memory controller: Red Hat, Inc. QEMU NVM Express Controller (rev 02) (prog-if 02 [NVM Express])
Subsystem: Red Hat, Inc. Device 1100
Flags: bus master, fast devsel, latency 0
Memory at 400000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] MSI-X: Enable+ Count=1 Masked-
Capabilities: [80] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [60] Power Management version 3
Kernel driver in use: nvmeHow can I solve this problem with kvmtool?
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