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Re: Cannot passthrough usb with bus number and device number



On 08.12.20 09:14, YaoHua Wu wrote:
Sometimes, qemu cannot find correct usb device number
Reproduce steps:
1、lsusb
Bus 001 Device 011: ID 090c:1000
1、prepare usb device attach xml
<hostdev managed="yes" mode="subsystem" type="usb">
<source>
<vendor id="0x090c" />
<product id="0x1000" />
<address bus='001' device='011'/>
</source><address bus="1" port="1" type="usb" />
</hostdev>
2、virsh attach-device vm usb.xml
error: internal error: Did not find USB device 090c:1000 bus:1 device 9

Question:
why the device number returned in qemu's error report is not what I wrote in xml, what I mean is that if my dev number is really wrong, the returned error should also be the number I wrote,
commonly when using dongle

Looks like the number 011 in your device='011' is interpreted as octal number: 1x8 + 1x1 = 9 in decimal

Best regards
	Andreas
--
Andreas Tscharner                                 sternenfeuer gmail com
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