Hi!
Hardcode the EPT page-walk level for L2 to be 4 levels, as KVM's MMU currently also hardcodes the page walk level for nested EPT to be 4 levels. The L2 guest is all but guaranteed to soft hang on its first instruction when L1 is using EPT, as KVM will construct 4-level page tables and then tell hardware to use 5-level page tables.
I don't get it. 7/191 reverts the patch, then 9/191 reverts the revert. Can we simply drop both 7 and 9, for exactly the same result?
(Patch 8 is a unused file, so it does not change the picture).
Patch 07 is reverting this patch from the same unused file, arch/x86/kvm/vmx/vmx.c[*]. The reason patch 07 looks like a normal diff is that a prior patch in 4.19.105 created the unused file (which is what's reverted by patch 08 here).
Patch 09 reintroduces the fix for the correct file, arch/x86/kvm/vmx.c.
Aha, thanks, I checked content few times but missed difference in filename. Now it makes sense.
Best regards, Pavel