Re: About two-dimensional page translation (e.g., Intel EPT) and shadow page table in Linux QEMU/KVM

[harry harry]

Dear Maxim,

Thanks for your reply. I knew, in our current design/implementation,
EPT/NPT is enabled by a module param. I think it is possible to modify
the QEMU/KVM code to let it support EPT/NPT and show page table (SPT)
simultaneously (e.g., for an 80-core server, 40 cores use EPT/NPT and
the other 40 cores use SPT). What do you think? Thanks!

Best regards,
Harry

On Mon, Jul 12, 2021 at 4:49 AM Maxim Levitsky <mlevitsk@redhat.com> wrote:
>
> On Sun, 2021-07-11 at 15:13 -0500, harry harry wrote:
> > Hi all,
> >
> > I hope you are very well! May I know whether it is possible to enable
> > two-dimensional page translation (e.g., Intel EPT) mechanisms and
> > shadow page table mechanisms in Linux QEMU/KVM at the same time on a
> > physical server? For example, if the physical server has 80 cores, is
> > it possible to let 40 cores use Intel EPT mechanisms for page
> > translation and the other 40 cores use shadow page table mechanisms?
> > Thanks!
>
> Nope sadly. EPT/NPT is enabled by a module param.
>
> Best regards,
>         Maxim Levitsky
>
> >
> > Best,
> > Harry
> >
>
>