linux-kernel - Re: [PATCH] PCI: remove pcibios_scan_all

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Date:	Tue, 23 Jun 2009 12:22:09 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	Matthew Wilcox <matthew@....cx>, Alex Chiang <achiang@...com>,
	jbarnes@...tuousgeek.org, linux-arch@...r.kernel.org,
	Kyle McMartin <kyle@...artin.ca>,
	Tony Luck <tony.luck@...el.com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Jeff Dike <jdike@...toit.com>, linux-kernel@...r.kernel.org,
	Ralf Baechle <ralf@...ux-mips.org>,
	David Howells <dhowells@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Ingo Molnar <mingo@...hat.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] PCI: remove pcibios_scan_all_fns()

On Mon, 2009-06-22 at 18:43 -0700, Chris Wright wrote:
> > I'd like to know what the KVM / Xen / ... people think about this.
> > I don't know if they rely on function 5 being able to show up out of
> > the blue.
> 
> KVM does not rely on this.  Typically a multi-function device's BDF
> gets
> remapped between host and guest (usually becoming a single function,
> function 0).

I'm surprised you don't hit problems with some devices/drivers here,
I have distinct memories of seeing such things as drivers who need
to know their own function number reliably.

Cheers,
Ben.


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