Re: [Qemu-devel] [PATCH RFC 1/2] hw/pci: delay bus_master_enable_region initialization

[Marcel Apfelbaum]

On 05/23/2016 05:08 PM, Paolo Bonzini wrote:
> On 23/05/2016 16:01, Marcel Apfelbaum wrote:
> > Skip bus_master_enable region creation on PCI devices init
> > in order to be sure the IOMMU device (if present) would
> > be created in advance. Add this memory region at machine_done time.
> >
> > Signed-off-by: Marcel Apfelbaum <address@hidden>
> > ---
> >   hw/i386/pc.c         | 17 +++++++++++++++++
> >   hw/pci/pci.c         | 22 ++++++++++++----------
> >   include/hw/pci/pci.h |  2 ++
> >   3 files changed, 31 insertions(+), 10 deletions(-)
>
> Does hotplug still work?

Hotplug does work, but the device can't be bus_master since I am adding
the bus_master_region only at machine_done...

Thank you for pointing that out, this can be easily solved by checking
the qdev_hotplug flag and enabling the bus_master region if we passed machine 
creation.

Other than that, does it seems to a you a feasible approach?

Thanks,
Marcel

> Thanks,
>
> Paolo