Re: [PATCH v2 5/8] KVM: x86/mmu: Use separate namespaces for guest PTEs and shadow PTEs

[Paolo Bonzini]

On 6/15/22 16:26, Sean Christopherson wrote:
> > +		 * For example, a 4-byte PDE consumes bits 31:22 and an 8-byte PDE
> > +		 * consumes bits 29:21.  Each guest PD must be expanded into four
> > +		 * shadow PDs, one for each value of bits 31:30, and the PDPEs
> > +		 * will use the four quadrants in round-robin fashion.
> It's not round-robin, that would imply KVM rotates through each quadrant on its
> own.  FWIW, I like David's comment from his patch that simplifies this mess in a
> similar way.
>
> https://lore.kernel.org/all/20220516232138.1783324-5-dmatlack@xxxxxxxxxx

Yeah, by round-robin I meant that the 512 entries will look like q=0 q=1 
q=2 q=3 q=0 q=1 etc.

I'll incorporate David's comment, minus the last paragraph.

Paolo