Re: [Qemu-devel] [PATCH] spapr_pci: fix MSI limit

[Alexander Graf <agraf@suse.de>]

On 05/04/2014 04:09 PM, Alexey Kardashevskiy wrote:
> At the moment XICS does not support interrupts reuse so sPAPR PHB
> implements this. sPAPRPHBState holds array of 32 spapr_pci_msi to
> describe PCI config address, first MSI and number of MSIs. Once
> allocated for a device, QEMU tries reusing this config until the number
> of MSIs changes.
>
> Existing SPAPR guests call ibm,change-msi in a loop until the handler
> returns the requested number of vectors.
>
> Recently introduced check for the maximum number of MSI/MSIX vectors
> supported by a device only works for a device which is new for PHB's
> MSI cache. If it is already there, the check is not performed which
> leads to new IRQ block allocation. This happens during PCI hotplug
> even when the user hot plug the same device which he just hot unplugged.
>
> This moves the check earlier.
>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

Thanks, applied to ppc-next.


Alex