linux-kernel - Re: [PATCH v6 04/30] xen/PCI: Don't use deprecated function pci_scan_bus

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Message-ID: <55135E83.3040804@huawei.com>
Date:	Thu, 26 Mar 2015 09:18:59 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Jiang Liu <jiang.liu@...ux.intel.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	"x86@...nel.org" <x86@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tony Luck <tony.luck@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Guan Xuetao" <gxt@...c.pku.edu.cn>, <linux-alpha@...r.kernel.org>,
	<linux-m68k@...r.kernel.org>, Liviu Dudau <liviu@...au.co.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH v6 04/30] xen/PCI: Don't use deprecated function pci_scan_bus_parented()

>>>> That seems OK to me.  Probably still wrong, but no worse than it was before.
>>>
>>> Interesting. The mechanism for PCI passthrough can either synthesize
>>> and PCI bus number starting at zero (so first device is always 0:0:0.0)
>>> or it can replicate the backend PCI topology. That means you
>>> could have segment values passed in, so: ab:ff:00.1). I've to admin
>>> I hadn't tried the 'physical' replication on an machine with
>>> domains (err, segments).
>>>
>>> Is there an git tree with this so I can just try it out?
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
>> pci/enumeration-yw6 has similar code (it exports the single
> 
> I presume now it is bjorn/pci/enumeration-yw8 ? Going to test this out
> this week.

Yes, it's the latest version. thanks!

>> busn_resource and makes xen use it).  That should be functionally
>> identical to what v4.0-rc1 does.
>>
>> Yijing hasn't posted the static busn_res proposal above yet, so I
>> don't have a branch with that in it.
>>
>> Bjorn
> 
> .
> 


-- 
Thanks!
Yijing

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