Re: [Qemu-devel] [PATCHv2-RFC 2/2] pci: add standard bridge device

[Gerd Hoffmann <kraxel@redhat.com>]

On 02/13/12 10:16, Michael S. Tsirkin wrote:
> This adds support for a standard pci to pci bridge,
> enabling support for more than 32 PCI devices in the system.
> Device hotplug is supported by means of SHPC controller.
> For guests with an SHPC driver, this allows robust hotplug
> and even hotplug of nested bridges, up to 31 devices
> per bridge.

This seems to not support 64bit prefetchable memory windows, at least
linux doesn't think it does, lspci looks like this:

00:10.0 PCI bridge: Red Hat, Inc. Device 0001 (prog-if 00 [Normal decode])
        Physical Slot: 16
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Region 0: Memory at f6126000 (32-bit, non-prefetchable) [size=256]
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
        Memory behind bridge: f6000000-f60fffff
        Prefetchable memory behind bridge: f8000000-fbffffff
        Secondary status: 66MHz+ FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- <SERR- <PERR-
        BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
                PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
        Capabilities: [40] Hot-plug capable
        Kernel modules: shpchp

Intentional?

cheers,
  Gerd