Re: [Xen-devel] [PATCH] x86: Disable IOAPIC earlier during shutdown

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.12.15 at 17:13, <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, disable the IOAPIC before each CPU's local APIC is
> disabled so that these interrupts are not generated.

But wouldn't a similar issue occur for MSI or MSI-like (IOMMU)
interrupts? I.e. shouldn't we perhaps invoke fixup_irqs() after
having restricted cpu_online_map to just CPU0?

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel