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

From: Jason Gunthorpe <[email-masked]>
Date: Wed, 25 Mar 2026 11:12:24 -0300

On Wed, Mar 25, 2026 at 06:55:40AM +0000, Tian, Kevin wrote:
> > I think this is more of a feature (RAS support for SMMUv3) than a
> > specific fix.
> > 
> 
> Not a RAS guy, but below is what I got from AI:
> 
> "
> RAS improvements typically involve better error reporting, graceful
> degradation, or improved recovery - but they usually don't involve
> scenarios where the system continues operating with compromised
> security assumptions."

Right, so currently there is no RAS in smmuv3, if it hits this error
it continues with "compromised security assumptions". Adding RAS
support is to avoid this.

Jason