Re: [PATCH v3 00/10] Add Intel VT-d nested translation

From: Jason Gunthorpe
Date: Mon May 29 2023 - 14:43:14 EST

On Wed, May 24, 2023 at 08:59:43AM +0000, Tian, Kevin wrote:

> At least this looks a reasonable tradeoff to some proprietary VMMs
> which never adds RO mappings in stage-2 today.

What is the reason for the RO anyhow?

Would it be so bad if it was DMA mapped as RW due to the errata?