From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Chen, Tiejun" <tiejun.chen@intel.com>
Subject: Re: [Xen-devel] [PATCH 2/2] xen:i386:pc_piix: create
 isa bridge specific to IGD passthrough
Date: Thu, 28 Aug 2014 08:56:26 +0800
Message-ID: <53FE7E3A.7050907@intel.com>
References: <1408584508-5946-1-git-send-email-tiejun.chen@intel.com>	<1408584508-5946-3-git-send-email-tiejun.chen@intel.com>	<20140821161649.GA18265@laptop.dumpdata.com>	<53F6978C.9080600@intel.com>	<20140824111206.GB9561@redhat.com>
	<53FAC70F.1080201@intel.com> <53FBF5BD.6060104@intel.com>
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: xen-devel@lists.xensource.com, allen.m.kay@intel.com, qemu-devel@nongnu.org, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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>>>>>> +     */
>>>>>> +    dev = pci_create_simple(bus, PCI_DEVFN(0x1f, 0),
>>>>>> +                            "xen-igd-passthrough-isa-bridge");
>>>>>> +    if (dev) {
>>>>>> +        r = xen_host_pci_device_get(&hdev, 0, 0, PCI_DEVFN(0x1f,
>>>>>> 0), 0);
>>>>>> +        if (!r) {
>>>>>> +            pci_config_set_vendor_id(dev->config, hdev.vendor_id);
>>>>>> +            pci_config_set_device_id(dev->config, hdev.device_id);
>>>
>>> Can you, instead, implement the reverse logic, probing
>>> the card and supplying the correct device id for PCH?
>>>
>>
>> Here what is your so-called reverse logic as I already asked you
>> previously? Do you mean I should list all PCHs with a combo illustrated
>> with the vendor/device id in advance? Then look up if we can find a
>
> Michael,
>

Ping.

Thanks
Tiejun

> Could you explain this exactly? Then I can try follow-up your idea ASAP
> if this is necessary and possible.
>
> Thanks
> Tiejun
>
>> matched PCH? If yes, what is that benefit you expect in passthrough
>> case? Shouldn't we pass these info to VM directly in passthrough case?
>>
>> Thanks
>> Tiejun
>>
>>
>>
>
>
>