[PATCH 2/3] powerpc/pci: unmap legacy INTx interrupts of passthrough IO adapters

[Michael Ellerman]

Cédric Le Goater <clg at kaod.org> writes:
> On 4/29/20 9:51 AM, Cédric Le Goater wrote:
>> When a passthrough IO adapter is removed from a pseries machine using
>> hash MMU and the XIVE interrupt mode, the POWER hypervisor, pHyp,
>> expects the guest OS to have cleared all page table entries related to
>> the adapter. If some are still present, the RTAS call which isolates
>> the PCI slot returns error 9001 "valid outstanding translations" and
>> the removal of the IO adapter fails.
>> 
>> INTx interrupt numbers need special care because Linux maps the
>> interrupts automatically in the Linux interrupt number space if they
>> are presented in the device tree node describing the IO adapter. These
>> interrupts are not un-mapped automatically and in case of an hot-plug
>> adapter, the PCI hot-plug layer needs to handle the cleanup to make
>> sure that all the page table entries of the XIVE ESB pages are
>> cleared.
>
> It seems this patch needs more digging to make sure we are handling
> the IRQ unmapping in the correct PCI handler. Could you please keep
> it back for the moment ? 

Yep no worries.

cheers