linux-kernel - Re: [PATCH 16/16 v6] PCI: document the new PCI boot parameters

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Date:	Fri, 07 Nov 2008 16:35:47 +0800
From:	"Zhao, Yu" <yu.zhao@...el.com>
To:	Greg KH <greg@...ah.com>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"achiang@...com" <achiang@...com>,
	"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"matthew@....cx" <matthew@....cx>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	"rdreier@...co.com" <rdreier@...co.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 16/16 v6] PCI: document the new PCI boot parameters

Greg KH wrote:
> On Fri, Nov 07, 2008 at 04:17:02PM +0800, Zhao, Yu wrote:
>>> Well, to do it "correctly" you are going to have to tell the driver to
>>> shut itself down, and reinitialize itself.
>>> Turns out, that doesn't really work for disk and network devices without
>>> dropping the connection (well, network devices should be fine probably).
>>> So you just can't do this, sorry.  That's why the BIOS handles all of
>>> these issues in a PCI hotplug system.
>>> How does the hardware people think we are going to handle this in the
>>> OS?  It's not something that any operating system can do, is it part of
>>> the IOV PCI spec somewhere?
>> No, it's not part of the PCI IOV spec.
>>
>> I just want the IOV (and whole PCI subsystem) have more flexibility on 
>> various BIOSes. So can we reconsider about resource rebalance as boot 
>> option, or should we forget about this idea?
> 
> As you have proposed it, the boot option will not work at all, so I
> think we need to forget about it.  Especially if it is not really
> needed.

I guess at least one thing would work if people don't want to boot 
twice: give the bus number 0 as rebalance starting point, then all 
system resources would be reshuffled :-)

Thanks,
Yu
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