linux-kernel - Re: [PATCH] iommu: amd: Set page size bitmap during V2 domain allocation

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Date:   Thu, 13 Apr 2023 11:55:00 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Jerry Snitselaar <jsnitsel@...hat.com>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
        Vasant Hegde <vasant.hegde@....com>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH] iommu: amd: Set page size bitmap during V2 domain
 allocation

On Tue, Apr 04, 2023 at 12:27:42AM -0700, Jerry Snitselaar wrote:
> With the addition of the V2 page table support, the domain page size
> bitmap needs to be set prior to iommu core setting up direct mappings
> for reserved regions. When reserved regions are mapped, if this is not
> done, it will be looking at the V1 page size bitmap when determining
> the page size to use in iommu_pgsize(). When it gets into the actual
> amd mapping code, a check of see if the page size is supported can
> fail, because at that point it is checking it against the V2 page size
> bitmap which only supports 4K, 2M, and 1G.
> 
> Add a check to __iommu_domain_alloc() to not override the
> bitmap if it was already set by the iommu ops domain_alloc() code path.
> 
> Cc: Vasant Hegde <vasant.hegde@....com>
> Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Joerg Roedel <joro@...tes.org>
> Fixes: 4db6c41f0946 ("iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API")
> Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
> ---
>  drivers/iommu/amd/iommu.c | 6 ++----
>  drivers/iommu/iommu.c     | 9 +++++++--
>  2 files changed, 9 insertions(+), 6 deletions(-)

Applied, thanks.