linux-kernel - Re: [PATCH] iommu/amd: Fix for L2 race with VM invalidation

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Date:	Tue, 20 May 2014 15:32:45 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	"Cornwall, Jay" <Jay.Cornwall@....com>
Cc:	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"Hurwitz, Sherry" <sherry.hurwitz@....com>,
	"Naru, Kim" <Kim.Naru@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iommu/amd: Fix for L2 race with VM invalidation

On Wed, May 14, 2014 at 11:38:25AM +0000, Cornwall, Jay wrote:
> Hi,
> 
> I'm not sure why you're submitting this, Suravee?
> 
> We already agreed that we need the extra mmu_notifier point, proposed
> by Joerg back in 2011, to eliminate the race. I had thought we were
> waiting on that to be implemented.

Speaking of this, would it also be possible to hold back all faults (so
not sending back ppr-comletions) between invalidate_range_start/end()?
Or will the hardware run into a timeout when it takes too long to
process a fault or when it issued the maximum number of parallel faults?


Regards,

	Joerg


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