Re: [Qemu-devel] [PATCH RFC 3/3] hw/pci-host: catch acesses to unassigned pci addresses

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Sep 02, 2013 at 06:42:33PM +0300, Marcel Apfelbaum wrote:
> On Mon, 2013-09-02 at 15:39 +0100, Peter Maydell wrote:
> > On 2 September 2013 15:13, Marcel Apfelbaum <marcel.a@redhat.com> wrote:
> > > Added a memory region that has negative priority and
> > > extends over all the pci adddress space. This region will
> > > "catch" all the accesses to the unassigned pci
> > > addresses and it will be possible to emulate the
> > > master abort scenario (When no device on the bus claims
> > > the transaction).
> > >
> > > Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
> > > ---
> > >  hw/pci-host/piix.c        |  8 ++++++++
> > >  hw/pci-host/q35.c         | 19 ++++++++++++++++---
> > >  include/hw/pci-host/q35.h |  1 +
> > 
> > This is happening at the wrong layer -- you want this memory
> > region to be created and managed in the PCI core code so that
> > we get correct PCI-spec behaviour for all our PCI controllers,
> > not just the two x86 ones you've changed here.pci_address_space
> I saw that the memory regions are part of the Host state and
> duplicated for each host type(like pci_address_space). 
> Question, why are not pci_address_space and pci_hole present
> in a core layer?


I think we can move them out to core.

> 
> I followed the existing code; from what you are saying
> I understand that also the existing memory regions 
> like the one mentioned above should be moved in
> the core layer, right?
> Marcel 

pci hole is a PC thing.

> > 
> > -- PMM
> > 
>