RE: [PATCH v2 0/7] iommu/arm-smmu-v3: Quarantine device upon ATC invalidation timeout

Tian, Kevin
2026-03-19T02:29:51Z

> From: Nicolin Chen <nicolinc@nvidia.com>
> Sent: Thursday, March 19, 2026 4:05 AM
>
> On Wed, Mar 18, 2026 at 07:47:18AM +0000, Tian, Kevin wrote:
> > > From: Nicolin Chen <nicolinc@nvidia.com>
> > > Sent: Wednesday, March 18, 2026 3:16 AM
> > >
> > > Hi all,
> > >
> > > This series addresses a critical vulnerability and stability issue where an
> > > unresponsive PCIe device failing to process ATC (Address Translation
> Cache)
> > > invalidation requests leads to silent data corruption and continuous
> SMMU
> > > CMDQ error spam.
> > >
> >
> > None of the patches in this series contains a Fixed tag and cc stable.
>
> Hmm, I guess AI overly polished the cover letter so it sounds too
> strong?
>
> This is essentially a vulnerability (potential memory corruption).
> And none of these patches actually fixes any regression. The PATCH
> 7 even requires the arm_smmu_invs series which has not been merged
> yet :-/
>

Fixes tag and backporting are not just for regression. People certainly
want to see reported vulnerabilities fixed in stable kernels...