Re: [PATCH v2 00/11] KVM: Support guest MAXPHYADDR < host MAXPHYADDR

[Paolo Bonzini]

On 19/06/20 17:39, Mohammed Gamal wrote:
> The last 3 patches (i.e. SVM bits and patch 11) are not intended for
> immediate inclusion and probably need more discussion.
> We've been noticing some unexpected behavior in handling NPF vmexits
> on AMD CPUs (see individual patches for details), and thus we are
> proposing a workaround (see last patch) that adds a capability that
> userspace can use to decide who to deal with hosts that might have
> issues supprting guest MAXPHYADDR < host MAXPHYADDR.

I think patch 11 can be committed (more or less).  You would actually
move it to the beginning of the series and have
"allow_smaller_maxphyaddr = !enable_ept;" for VMX.  It is then changed
to "allow_smaller_maxphyaddr = true;" in "KVM: VMX: Add guest physical
address check in EPT violation and misconfig".

In fact, it would be a no-brainer to commit patch 11 in that form, so
feel free to submit it separately.

Thanks,

Paolo