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

[Ivan Pavic <ivan.pavic2@xxxxxx>]

On 07/05/2017 01:27 PM, Julien Grall wrote:
> 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].
I checked xl-list. There is no domain with id 1, only dom0. Also I tried 
xenctx 1 which resulted in
    xc_domain_getinfo: No such process

Same problem is with rtds scheduler. As I said, no problem with credit 
scheduler.
> 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
Regards,

Ivan Pavic


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