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: <Yp8FpnMrlJcXIHqq@8bytes.org>
Date:   Tue, 7 Jun 2022 10:00:38 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        vasant.hegde@....com, jon.grimm@....com
Subject: Re: [PATCH v2] iommu/amd: Set translation valid bit only when IO
 page tables are in used

On Thu, May 26, 2022 at 10:29:09AM +0700, Suravee Suthikulpanit wrote:
> Actually, I am referring to when user uses the IOMMU v2 table for shared virtual address
> in current iommu_v2 driver (e.g. amd_iommu_init_device(), amd_iommu_bind_pasid).

>From what I can see this is not handled yet and needs an additional
check. I think the best solution is to set iommu->iommu_v2 to false when
the SNP feature bit is set.
But that is probably not enough, all functions that are called from the
IOMMUv2 driver need to fail.

Regards,

	Joerg