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

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 01/27/2014 05:33 PM, Oleksandr Tyshchenko wrote:
> Hi, all.

Hello Oleksandr,

> We are trying to bringing up XEN on DRA7XX (OMAP5) platform.
> 
> We sometimes see some hangs in Hypervisor and these hangs are related to SMP.
> We found out that deadlock took place in on_selected_cpus function
> in case of simultaneous occurrence cross-interrupts.
> 
> The issue:
> 
> 1. We receive irqs from first CPU (for example CPU0) and second CPU (for 
> example CPU1) in parallel.
> 2. In our case the maintenance_interrupt function for maintenance irq from 
> CPU0 is executed on CPU1 and
> maintenance_interrupt for irq from CPU1 is executed on CPU0.
> 3. According to existing logic we have run gic_irq_eoi function on CPU which 
> it was scheduled.

gic_irq_eoi is only called for physical IRQ routed to the guest (eg:
hard drive, network, ...). As far as I remember, these IRQs are only
routed to CPU0. Do you pass-through PPIs to dom0?

-- 
Julien Grall

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