Re: [PATCH 05/54] Revert "KVM: x86/mmu: Drop kvm_mmu_extended_role.cr4_la57 hack"

[Yu Zhang]

On Fri, Jun 25, 2021 at 12:25:46PM +0200, Paolo Bonzini wrote:
> On 25/06/21 11:29, Yu Zhang wrote:
> > Thanks, Paolo.
> > 
> > Do you mean the L1 can modify its paging mode by setting HOST_CR3 as root of
> > a PML5 table in VMCS12 and HOST_CR4 with LA57 flipped in VMCS12, causing the
> > GUEST_CR3/4 being changed in VMCS01, and eventually updating the CR3/4 when
> > L0 is injecting a VM Exit from L2?
> 
> Yes, you can even do that without a "full" vmentry by setting invalid guest
> state in vmcs12. :)

Hah.. Interesting. :) I think this is what load_vmcs12_host_state() does. Anyway,
thanks a lot for the explanation!

Also my reviewed-by for this one.

Rviewed-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>

B.R.
Yu