Re: [Qemu-devel] [PATCH 1/6] q35: make pci window address/size match guest cfg

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

On Tue, Sep 10, 2013 at 03:37:12PM +0200, Igor Mammedov wrote:
> On Wed, 4 Sep 2013 13:48:29 +0300
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
> 
> > For Q35, MMCFG address and size are guest configurable.
> > Update w32 property to make it behave accordingly.
> >
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > ---
> >  hw/pci-host/q35.c | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
> > index 4febd24..3f1d447 100644
> > --- a/hw/pci-host/q35.c
> > +++ b/hw/pci-host/q35.c
> > @@ -214,6 +214,16 @@ static void mch_update_pciexbar(MCHPCIState *mch)
> >      }
> >      addr = pciexbar & addr_mask;
> >      pcie_host_mmcfg_update(pehb, enable, addr, length);
> > +    /* Leave enough space for the MCFG BAR */
> > +    /*
> > +     * TODO: this matches current bios behaviour, but it's not a power of two,
> > +     * which means an MTRR can't cover it exactly.
> > +     */
> > +    if (enable) {
> > +        mch->pci_info.w32.begin = addr + length;
> > +    } else {
> > +        mch->pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
> > +    }
> >  }
> I probably miss something but where is remapping in system address space?
> If there is none then, then updated w32 might mismatch actually/initially mapped alias.
> 
> >  /* PAM */

You mean mmcfg?
The re-mapping is in hw/pci/pcie_host.c