Re: KVM PCI passthrough IRQ limitations

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* Jason Kwon (jkwon@xxxxxxxxxxx) wrote:
> pci 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
> IRQ handler type mismatch for IRQ 16
> current handler: uhci_hcd:usb3

This is a shared interrupt (and pci device assignment will request a
non-shared interrupt).  Are you using that usb host controller?  Can you
unbind it?

> Pid: 3597, comm: qemu-system-x86 Not tainted 2.6.28.1-19.fc10.x86_64 #1
> Call Trace:
>  [<ffffffff810891f6>] __setup_irq+0x1f4/0x227
>  [<ffffffffa01bc917>] ? kvm_assigned_dev_intr+0x0/0x2c [kvm]
>  [<ffffffff810892fc>] request_irq+0xd3/0x15a
>  [<ffffffffa01bc9d2>] assigned_device_update_intx+0x8f/0xa9 [kvm]
>  [<ffffffffa01be711>] kvm_vm_ioctl+0x6af/0x79c [kvm]
>  [<ffffffff8114d9bf>] ? inode_has_perm+0x5b/0x61
>  [<ffffffff81051241>] ? __sigqueue_free+0x38/0x3c
>  [<ffffffff81051f39>] ? __dequeue_signal+0x103/0x12f
>  [<ffffffff810d82ec>] vfs_ioctl+0x2a/0x78
>  [<ffffffff810d86cc>] do_vfs_ioctl+0x392/0x3c0
>  [<ffffffff810d874f>] sys_ioctl+0x55/0x77
>  [<ffffffff8101106a>] system_call_fastpath+0x16/0x1b
> kvm: failed to enable INTx device!
> pci 0000:02:00.0: PCI INT A disabled
>
> lspci -t shows:
>
> -[0000:00]-+-00.0
>            +-01.0-[0000:01]--
>            +-03.0-[0000:02]----00.0

OK, only the one device behind this bridge

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