linux-kernel - Re: [PATCHv2 3/4] pci: Determine actual VPD size on first access

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Message-ID: <1471299799.12231.121.camel@kernel.crashing.org>
Date:	Tue, 16 Aug 2016 08:23:19 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"Rustad, Mark D" <mark.d.rustad@...el.com>
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	Alexander Duyck <alexander.duyck@...il.com>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Bjorn Helgaas <helgaas@...nel.org>,
	Hannes Reinecke <hare@...e.de>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Babu Moger <babu.moger@...cle.com>,
	Paul Mackerras <paulus@...ba.org>,
	"santosh@...lsio.com" <santosh@...lsio.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCHv2 3/4] pci: Determine actual VPD size on first access

On Mon, 2016-08-15 at 17:59 +0000, Rustad, Mark D wrote:
> > Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> 
> > 
> > We may want some kind of "strict" vs. "relaxed" model here to
> > differenciate the desktop user wanting to give a function to his/her
> > windows partition and doesn't care about strict isolation vs. the cloud
> > data center.
> 
> I don't think desktop users appreciate hangs any more than anyone else, and  
> that is one of the symptoms that can arise here without the vfio  
> coordination.

And can happen with it as well.... 

Put it this way, we have a hole the size of a football field and we are
spending all that time "plugging" it by putting a 3 foot gate in the
middle of it... ugh.

VFIO shouldn't try to get between the device driver and the HW, it doesn't
work. It cannot work.

Cheers,
Ben.