sse450 Posted December 1, 2018 Share Posted December 1, 2018 I would like to passthrough serial port to my CentOS VM, but have no clue how to do that. I would appreciate any help. Please find below relevant information from my Unraid: Unraid version: 6.6.5 lspci -v 09:00.0 Serial controller: Device 1c00:3253 (rev 10) (prog-if 05 [16850]) Subsystem: Device 1c00:3253 Flags: fast devsel, IRQ 16, NUMA node 0 I/O ports at 2000 [size=256] Memory at 92b00000 (32-bit, prefetchable) [size=32K] I/O ports at 2100 [size=4] [virtual] Expansion ROM at 92e00000 [disabled] [size=32K] Capabilities: [60] Power Management version 3 Capabilities: [68] MSI: Enable- Count=1/32 Maskable+ 64bit+ Capabilities: [80] Express Legacy Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Kernel driver in use: serial setserial -g /dev/ttyS[0123] /dev/ttyS0, UART: 16550A, Port: 0x02f8, IRQ: 3 Thank you. Quote Link to comment
Squid Posted December 1, 2018 Share Posted December 1, 2018 You'd have to stub it in the syslinux.cfg file Quote Link to comment
sse450 Posted December 1, 2018 Author Share Posted December 1, 2018 3 hours ago, Squid said: You'd have to stub it in the syslinux.cfg file @Squid Thanks for the hint. Is below text in the append line sufficient/correct? vfio-pci.ids=1c00:3253 Quote Link to comment
Squid Posted December 1, 2018 Share Posted December 1, 2018 I usually use pci-stub.ids=xxxx.xxxx Quote Link to comment
sse450 Posted December 2, 2018 Author Share Posted December 2, 2018 15 hours ago, Squid said: I usually use pci-stub.ids=xxxx.xxxx Interesting results. I put pci-stub.ids=1c00:3253 in the append line and rebooted. Stopped CentOS VM and wanted to add serial port in the edit window. It says at the bottom: Other PCI Devices: None available Started VM and SSHed into it and received below results: [root@centos ~]# setserial -g /dev/ttyS[0123] /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 /dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3 /dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4 /dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3 [root@centos ~]# dmesg | grep tty [ 0.000000] console [tty0] enabled [ 1.359365] 00:03: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A So far so good. But, just for a learning experience, I removed pci-stub.ids=1c00:3253 in the append line and rebooted again. Then, I SSHed into CentOS again and received exactly the same results as above. It looks like Unraid host and CentOS VM can both reach the serial interface irrespective of passthrough. How come is it possible? I am stumped. Could you please shed some light here? Thank you. Quote Link to comment
sse450 Posted December 2, 2018 Author Share Posted December 2, 2018 I think that ttyS0 is nothing to do with the ports on PCIe card. PCIe card has 2 serial ports. It should not come up as 1 port, I believe. So, my card is recognized by Unraid as pci device but drivers not loaded. Is it possible? If so, what should I do to properly load drivers for PCIe serial ports? Quote Link to comment
Squid Posted December 2, 2018 Share Posted December 2, 2018 I know that on my Windows VM, a virtual serial port is automatically created by KVM Quote Link to comment
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