linux-kernel - Re: [PATCH v2] iommu/amd: Set translation valid bit only when IO page tables are in used

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Message-ID: <YodYTZzSd9fZucLT@8bytes.org>
Date:   Fri, 20 May 2022 10:58:53 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        iommu@...ts.linux-foundation.org, jon.grimm@....com,
        linux-kernel@...r.kernel.org, vasant.hegde@....com
Subject: Re: [PATCH v2] iommu/amd: Set translation valid bit only when IO
 page tables are in used

On Fri, May 20, 2022 at 09:54:51AM +0100, Robin Murphy wrote:
> The .def_domain type op already allows drivers to do exactly this sort of
> override. You could also conditionally reject IOMMU_DOMAIN_PASSTHROUGH in
> .domain_alloc for good measure, provided that (for now at least*) SNP is a
> global thing rather than per-instance.

Yeah, that could work. I am just not sure the IOMMU core behaves well in
all situations when allocation IOMMU_DOMAIN_PASSTHROUGH suddenly starts
to fail. I would feel better if this is checked and tested :)

Regards,

	Joerg