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KVM PV (was: Re: [PATCH v2 2/2] x86/lguest: remove lguest support)

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Hello, all

An interesting (at least to me) thinking came up to me when I found
that the lguest was removed. But I don't have enough knowledge
to find out the answer nor energy to implement it in some time.

Is it possible to implement kvm-pv which allows kvm to run on
the boxes without hardware virtualization support, so that
qemu/kvm can be used on clouds such as aws, azure?

Without hardware virtualization support, the host kvm-pv module and
the guest linux kernel need to cooperate in some ways. And some kvm
facilities can help. For instance, the existing shadow-paging, which
was not introduced when lguest had been added to kernel, could be
reused to help on mmu virtualization. For guest kernel/userspace
separation in x86_64, the intel cpu's segment registers can help too.
(or use a new set of page-table for the guest kernel on amd64).

The thought is quite shallow, but I hope this email brings some
inspirations rather than annoyance. And I'm sorry if the later things
would happen.

Thanks,
Lai.

On Thu, Aug 17, 2017 at 1:31 AM, Juergen Gross <jgross@suse.com> wrote:
> Lguest seems to be rather unused these days. It has seen only patches
> ensuring it still builds the last two years and its official state is
> "Odd Fixes".
>
> Nuke it in order to be able to clean up the paravirt code.

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KVM PV (was: Re: [PATCH v2 2/2] x86/lguest: remove lguest support) Lai Jiangshan <jiangshanlai+lkml@gmail.com> - 2017-09-29 17:50 +0200
  Re: KVM PV (was: Re: [PATCH v2 2/2] x86/lguest: remove lguest  support) Paolo Bonzini <pbonzini@redhat.com> - 2017-09-29 18:40 +0200
    Re: KVM PV (was: Re: [PATCH v2 2/2] x86/lguest: remove lguest support) Lai Jiangshan <jiangshanlai+lkml@gmail.com> - 2017-09-30 02:10 +0200
      Re: KVM PV (was: Re: [PATCH v2 2/2] x86/lguest: remove lguest  support) Paolo Bonzini <pbonzini@redhat.com> - 2017-09-30 05:40 +0200
        Re: [Xen-devel] KVM PV (was: Re: [PATCH v2 2/2] x86/lguest: remove  lguest support) George Dunlap <george.dunlap@citrix.com> - 2017-10-02 12:40 +0200
          Re: [Xen-devel] KVM PV Paolo Bonzini <pbonzini@redhat.com> - 2017-10-02 14:20 +0200
    Re: [Xen-devel] KVM PV (was: Re: [PATCH v2 2/2] x86/lguest: remove  lguest support) George Dunlap <dunlapg@umich.edu> - 2017-10-02 12:20 +0200

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