linux-kernel - Re: [PATCH] intel_iommu: Disable vfio and kvm interrupt assignment when unsafe

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Message-ID: <20130207212145.GE2849@8bytes.org>
Date:	Thu, 7 Feb 2013 22:21:53 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Gleb Natapov <gleb@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Don Zickus <dzickus@...hat.com>,
	Prarit Bhargava <prarit@...hat.com>
Subject: Re: [PATCH] intel_iommu: Disable vfio and kvm interrupt assignment
 when unsafe

On Thu, Feb 07, 2013 at 09:02:38PM +0000, David Woodhouse wrote:
> Backtraces add visibility and have proven to be extremely useful in the
> past for getting people to actually *fix* broken BIOSes.
> 
> When kerneloops.org was running, it also gave very good statistics which
> helped to apply pressure.

That is true in general, but does not apply to the two warnings in
question here. One warning checks for a hypothetical hardware problem
and the other warning could happen for several reasons, not only a
firmware bug.

It would make sense to put a warning in the respective places where a
firmware problem is detected, though. The parse_ioapics_under_ir()
function is a candidate where it would make sense, for example. But in
the error path of the intel_enable_irq_remapping() function a pr_warn
would do the same job.

	Joerg

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