Re: [Xen-devel] [PATCH v1 0/2] xen/arm: maintenance_interrupt SMP fix

[Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>]

On Wed, Jan 29, 2014 at 3:12 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hello Oleksandr,
>
> On 28/01/14 19:25, Oleksandr Tyshchenko wrote:
>
> [..]
>
>
>>
>>     Do you pass-through PPIs to dom0?
>>
>> If I understand correctly that PPIs is irqs from 16 to 31.
>> So yes, I do. I see timer's irqs and maintenance irq which routed to
>> both CPUs.
>
>
> This IRQs are used by Xen, therefore they are emulated for dom0 and domU.
> Xen won't EOI in maintenance_interrupt theses IRQs.
>
>
>>
>> And I have printed all irqs which fall to gic_route_irq_to_guest and
>> gic_route_irq functions.
>> ...
>> (XEN) GIC initialization:
>> (XEN)         gic_dist_addr=0000000048211000
>> (XEN)         gic_cpu_addr=0000000048212000
>> (XEN)         gic_hyp_addr=0000000048214000
>> (XEN)         gic_vcpu_addr=0000000048216000
>> (XEN)         gic_maintenance_irq=25
>> (XEN) GIC: 192 lines, 2 cpus, secure (IID 0000043b).
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 25, cpu_mask: 00000001
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 30, cpu_mask: 00000001
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 26, cpu_mask: 00000001
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 27, cpu_mask: 00000001
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 104, cpu_mask: 00000001
>> (XEN) Using scheduler: SMP Credit Scheduler (credit)
>> (XEN) Allocated console ring of 16 KiB.
>> (XEN) VFP implementer 0x41 architecture 4 part 0x30 variant 0xf rev 0x0
>> (XEN) Bringing up CPU1
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 25, cpu_mask: 00000002
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 30, cpu_mask: 00000002
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 26, cpu_mask: 00000002
>> (XEN)
>> (XEN) >>>>> gic_route_irq: irq: 27, cpu_mask: 00000002
>> (XEN) CPU 1 booted.
>> (XEN) Brought up 2 CPUs
>> (XEN) *** LOADING DOMAIN 0 ***
>> (XEN) Populate P2M 0xc8000000->0xd0000000 (1:1 mapping for dom0)
>> (XEN)
>> (XEN) >>>>> gic_route_irq_to_guest: domid: 0, irq: 61, cpu: 0
>
>
> [..]
>
>
>> (XEN) >>>>> gic_route_irq_to_guest: domid: 1, irq: 61, cpu: 1
>
>
> Not related to this patch series, but is it normal that you passthrough the
> same interrupt both to dom0 and domU?
>
No, it isn't. Although, these interrupts are not used in both domains,
we need to make cleanup. Thank you for your attention.
> There is few other case like that.
>
> --
> Julien Grall

-- 
Oleksandr Tyshchenko | Embedded Developer
GlobalLogic

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