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[Bug 1843711] Re: qemu-xhci device should detect if libusb host supports
From: |
Thomas Huth |
Subject: |
[Bug 1843711] Re: qemu-xhci device should detect if libusb host supports streams |
Date: |
Wed, 05 May 2021 14:28:52 -0000 |
This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:
https://gitlab.com/qemu-project/qemu/-/issues/182
** Changed in: qemu
Status: New => Expired
** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #182
https://gitlab.com/qemu-project/qemu/-/issues/182
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https://bugs.launchpad.net/bugs/1843711
Title:
qemu-xhci device should detect if libusb host supports streams
Status in QEMU:
Expired
Bug description:
When using USBÂ passthrough with the qemu-xhci (and nec-usb-xhci),
streams are enabled by default, but if the host xHCI controller
doesn't support them, it will trigger hard-to-debug UAS guest errors.
This should be possible to detect since the kernel returns ENOSYS (errno 38)
when xhci host controller does not support streams:
libusb: error [do_streams_ioctl] streams-ioctl failed error -1
errno 38
qemu: libusb_alloc_streams: -99 [OTHER]
Maybe libusb should return a dedicated error instead of
LIBUSB_ERROR_OTHER in this case, but qemu does not handle any other
error code anyway.
Just trying to enable streams before enabling them in qemu should do
it. I don't know if it should be done in hcd-xhci.c, host-libusb.c or
elsewhere, but this would be detectable at launch instead of a static
option true/false, maybe a ternary with auto would be better.
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