Re: [Xen-devel] Possible bug on ARM with irq passthrough

[Julien Grall <julien.grall@xxxxxxx>]

On 04/07/17 21:20, Ivan Pavić2 wrote:
> Hello,
Hi Ivan,

> I'm testing IRQ latency on exynos5422. I'm using Xen 4.10-unstable. I used 
> device passthrough for SPI irq 64. For guest domain I used  FreeRTOS. When I 
> use credit scheduler after destruction of domain, IRQ is released. I changed 
> scheduler to credit2 and rtds at boot time and IRQ wasn't released after 
> destruction. xl create dom-free-rtos.cfg fails with:
>
> libxl: error: libxl_create.c:1278:domcreate_launch_dm: Domain 5:failed give 
> domain access to irq 64: Device or resource busy
>
> This is very strange because it doesn't happen with credit scheduler. This is 
> output of xl dmesg:
>
> (XEN) IRQ 64 is already used by domain 1
>
> Everything works first time but when I destroy domain and try to create again 
> it fails. It works normally with credit scheduler. In dom-free-rtos.cfg:
> ...
> irqs = [64]
> ....
The Domain 1 still seems to be alive, you can confirm by via "xl list". 
You said it works with credit but not credit2. I think you hit the bug 
described in [1].
Dario, do you have any status on this bug? I think we should consider it 
as a blocker for Xen 4.10.
Cheers,

[1] 
https://lists.xenproject.org/archives/html/xen-devel/2017-02/msg00138.html
--
Julien Grall

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