Re: [RFC PATCH] iommu/arm-smmu-v3: Allow nested attach for PCI bridges without vDEVICE

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From: Jason Gunthorpe

Date: Fri Aug 14 2026 - 13:50:15 EST

On Fri, Aug 14, 2026 at 02:15:45PM +0000, Pranjal Shrivastava wrote:

> Also, regarding RID aliasing: while it's true the host bridge doesn't
> need a vDEVICE for its own host-consumed DMAs (like AER/PME), are we

RID aliasing shouldn't exist in any modern system. Unfortunately Linux
gets some things wrong in its ACS processing :\

Jason