Re: [RFC 25/33] KVM: Introduce a set of new memory attributes

[Alexander Graf]

On 08.11.23 12:17, Nicolas Saenz Julienne wrote:
> Introduce the following memory attributes:
>   - KVM_MEMORY_ATTRIBUTE_READ
>   - KVM_MEMORY_ATTRIBUTE_WRITE
>   - KVM_MEMORY_ATTRIBUTE_EXECUTE
>   - KVM_MEMORY_ATTRIBUTE_NO_ACCESS
>
> Note that NO_ACCESS is necessary in order to make a distinction between
> the lack of attributes for a gfn, which defaults to the memory
> protections of the backing memory, versus explicitly prohibiting any
> access to that gfn.


If we negate the attributes (no read, no write, no execute), we can keep 
0 == default and 0b111 becomes "no access".


Alex




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