Re: [PATCH v5 4/6] iommu/arm-smmu-v3: Skip EVTQ/PRIQ setup in kdump kernel

[Jason Gunthorpe]

On Sun, May 10, 2026 at 02:23:03PM -0700, Nicolin Chen wrote:
> In kdump cases, the crashed kernel's CDs and page tables can be corrupted,
> which could trigger event spamming. Also, we cannot serve page requests.
> 
> Skip the EVTQ/PRIQ setup entirely rather than enabling then disabling them.
> 
> Also add some inline comments explaining that.
> 
> Fixes: b63b3439b856 ("iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel")
> Cc: stable@xxxxxxxxxxxxxxx # v6.12+
> Suggested-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 43 +++++++++++++--------
>  1 file changed, 27 insertions(+), 16 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason