linux-kernel - Re: [PATCH v8 11/13] iommu/amd: Don't copy GCR3 table root pointer

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Message-ID: <20170727155755.GP3610@suse.de>
Date:   Thu, 27 Jul 2017 17:57:55 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 11/13] iommu/amd: Don't copy GCR3 table root pointer

On Fri, Jul 21, 2017 at 04:59:09PM +0800, Baoquan He wrote:
> When iommu is pre_enabled in kdump kernel, if a device is set up with
> guest translations (DTE.GV=1), then don't copy GCR3 table root pointer
> but move the device over to an empty guest-cr3 table and handle the
> faults in the PPR log (which answer them with INVALID). After all these
> PPR faults are recoverable for the device and we should not allow the
> device to change old-kernels data when we don't have to.

Okay, forget my previous comment about disabling IOMMUv2 features while
copying. Its done in this patch.