linux-kernel - Re: [PATCH] vfio-pci: PCI hot reset interface

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Message-ID: <1376952167.25016.85.camel@pasglop>
Date:	Tue, 20 Aug 2013 08:42:47 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] vfio-pci: PCI hot reset interface

On Mon, 2013-08-19 at 14:02 -0600, Bjorn Helgaas wrote:
> I guess.  And supply the pci_slot rather than the pci_dev?  I'm a
> little bit worried because the idea of a "slot" is not well-defined in
> the spec, and we have sort of an ad hoc method of discovering and
> managing them, e.g., acpiphp and pciehp might discover the same slot.
> But I guess that's no reason to bury generic code in vfio.

And I don't have pci_slot's at all yet on powerpc "powernv" (the host
platform for KVM) since at this stage we don't support physical hotplug
on the target machines...

Alex, why specifically looking for "slots" here ? I don't quite
understand. It makes sense to be able to reset individual devices
whether they are on the otherboard, behind extension chassis or directly
on slots...

Cheers,
Ben.
 

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