Re: USB passthrough fails with 64GB drive but works fine with 8GB drive

[Juergen Gross <jgross@xxxxxxxx>]

[removing xen-users to avoid crossposting]

On 18.08.22 08:18, A Sudheer wrote:
> Hi All
>
> On XEN-4.16 with Ubuntu 22.04 Dom0 and HVM-DomU, I tried to do a USB mass 
> storage device passthrough to DomU.
> I followed the PVUSB method mentioned in 
> https://wiki.xenproject.org/wiki/Xen_USB_Passthrough 
> <https://wiki.xenproject.org/wiki/Xen_USB_Passthrough>.
> With 8GB sandisk pen drive, i am able to do USB passthrough to DomU.
> But with 64GB sandisk pendrive, though able to mount/umount in Dom0, not able to 
> do passthrough to DomU.
> I see IO errors in dmesg  when tried to access the usb disk folder in DomU.
> Both 8GB and 64GB disks are 3.2Gen1. (Not tried with 16GB & 32GB drives).
>
> Does anyone know why 64GB usb disk passthrough fails with the below error ?
>
> Dmesg Error:
> -----------------
> [  128.333409] usb 2-1: reset high-speed USB device number 2 using ehci-pci
> [  128.502872] sd 2:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_ERROR 
> driverbyte=DRIVER_OK cmd_age=0s
> [  128.502881] sd 2:0:0:0: [sda] tag#0 CDB: Read(10) 28 00 00 00 7a b7 00 00 3f 
> 00
> [  128.502883] blk_update_request: I/O error, dev sda, sector 31415 op 
> 0x0:(READ) flags 0x80700 phys_seg 63 prio class 0
Do you have the related qemu log from dom0? Should be something like
/var/log/xen/qemu-dm-*.log


Juergen

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