linux-kernel - Re: [PATCH 0/3] iommu/amd: Fix unable to handle page fault due to AVIC

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Date:   Tue, 31 Aug 2021 12:10:27 -0500
From:   "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, Jon.Grimm@....com, wei.huang2@....com
Subject: Re: [PATCH 0/3] iommu/amd: Fix unable to handle page fault due to
 AVIC

Joerg,

Here is an dditional tags for this series:

Fixes: 8bda0cfbdc1a ("iommu/amd: Detect and initialize guest vAPIC log")

Are there any concerns with this series?

Thanks
Suravee

On 8/20/2021 3:29 PM, Suravee Suthikulpanit wrote:
> This bug is triggered when rebooting VM on a system which
> SVM AVIC is enabled but IOMMU AVIC is disabled in the BIOS.
> 
> The series reworks interrupt remapping intialiation to
> check for IOMMU AVIC support (GAMSup) at earlier stage using
> EFR provided by IVRS table instead of the PCI MMIO register,
> which is available after PCI support for IOMMU is initialized.
> This helps avoid having to disable and clean up the already
> initialized interrupt-remapping-related parameter.
> 
> Thanks,
> Suravee
> 
> Suravee Suthikulpanit (2):
>    iommu/amd: Introduce helper function to check feature bit on all
>      IOMMUs
>    iommu/amd: Remove iommu_init_ga()
> 
> Wei Huang (1):
>    iommu/amd: Relocate GAMSup check to early_enable_iommus
> 
>   drivers/iommu/amd/init.c | 45 ++++++++++++++++++++++------------------
>   1 file changed, 25 insertions(+), 20 deletions(-)
>