Re: [Xen-devel] [PATCH v3] x86: Fixup IRQs when CPUs go down during shutdown

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.12.15 at 15:01, <ross.lagerwall@xxxxxxxxxx> wrote:
> Commit fc0c3fa2ad5c ("x86/IO-APIC: fix setup of Xen internally used IRQs
> (take 2)") introduced a regression on some hardware where Xen would hang
> during shutdown, repeating the following message:
> APIC error on CPU0: 08(08), Receive accept error
> 
> This appears to be because an interrupt (in this case from the serial
> console) destined for a CPU other than the boot CPU is left unhandled so
> an APIC error on CPU 0 is generated instead.
> 
> To fix this, before taking down the non-boot CPUs, call fixup_irqs()
> with a CPU mask of only the boot CPU to reset the IRQ affinities
> correctly.
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Albeit along the lines of ...

> * Reduce code churn

... I really would have wanted the split of the functions to be
undone too (renaming the bool_t function parameter suitably).

Jan


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