[forgot to cc to the mail list]
Kevin O'Connor kevin@koconnor.net 于2018年8月8日周三 下午10:14写道：
On Thu, Aug 02, 2018 at 10:39:13AM +0800, Zihan Yang wrote:
NOTE: This patch set is still ongoing and does not fully function as its goal. But it involves some API changes, therefore I post them for comments before moving on to make sure I'm on the right path.
The corresponding qemu part can be found at https://gitlab.com/WhoisZihan/qemu-pci-domain/tree/master/qemu I will submit it to qemu list later.
Currently seabios assumes there is only one pci domain(0), and almost everything operates on pci domain 0 by default. This patch aims to add multiple pci domain support for pci_device, while reserve the original API for compatibility.
Thanks. I understand the desire to support multiple PCI domains in QEMU and the guest OS. However, what is the high level reason for wanting the BIOS to be able to interact with the secondary PCI domains?
The pxb-pcie host bus is put into a separated domain, so are the devices under the pxb host bus. I think we should also initialize busses in other domains and probe those devices during bios initialization. But currently qemu only binds port 0xcf8 and 0xcfc to q35 host's conf_mem and data_mem, if we want to read the config space of pxb host, we should use another port. I use port range 0x1000 and 0x1004 for a temporary workaround because they seem to be 'free' now.
Please correct me if I misunderstand it.
P.S. Maybe you would want to ignore this patch set as there are a few bugs that I fix later, and I will soon send a v2 patch (v2 is not working either, but I think I find where the current problem is), soon after I fix my network proxy issue...
Thanks Zihan
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Zihan Yang