Re: [PATCH v7 4/5] KVM: arm64: Allow cacheable stage 2 mapping using VMA flags

[Donald Dutile]

On 6/19/25 8:14 AM, Ankit Agrawal wrote:
> Considering the feedback, I think we may do the following here: 
> 1. Rename the device variable to S2_noncacheable to represent if the S2 is going to be marked non cacheable. Otherwise S2 will be mapped NORMAL. 
> 2. Detect what PFN has to be marked S2_noncacheable. If a PFN is not in the kernel map, mark as S2 except for PFNMAP + VMA cacheable.
  Q: 'mark as S2 except'... should be 'mark as S2_noncacheable' ?
 
> 3. Prohibit cacheable PFNMAP if hardware doesn't support FWB and CACHE DIC. 
> 4. Prohibit S2 non cached mapping for cacheable VMA for all cases, whether pre-FWB hardware or not.