Re: [Xen-devel] [PATCH] Enable EPT (Extended Page Table)

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

What's HVM_IDENT_PT all about? If you need an identity page table can you
not hide it? I don't see why it would need to be, or want to be,
guest-visible.

 -- Keir

On 13/12/07 06:25, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx> wrote:

> The patch attached enables the EPT feature. When present, it provides a
> direct mechanism to virtualize physical memory in HVM guests running on
> processors with Intel(c) Virtualization Technology. It applies to the
> unstable tree.
> 
> We now use the EPT page table as P2M (guest physical to macihne
> mapping), removing the linear page table when EPT is used for the domain
> (see the new file p2m-ept.c). We did this by adding three operations in
> the p2m_domain. If VT-d is enabled, the EPT page table will be used as
> the VT-d page table as well (i.e. shared).
> 
>  b/xen/arch/x86/mm/p2m-ept.c        |  175
> +++++++++++++++++++++++++++++++++++++
>  tools/libxc/xc_hvm_build.c         |   14 ++
>  xen/arch/x86/hvm/hvm.c             |    4
>  xen/arch/x86/hvm/vmx/vmcs.c        |   62 +++++++++++--
>  xen/arch/x86/hvm/vmx/vmx.c         |  135 +++++++++++++++++++++++++---
>  xen/arch/x86/mm/Makefile           |    1
>  xen/arch/x86/mm/p2m.c              |   20 +++-
>  xen/include/asm-x86/domain.h       |   26 +++++
>  xen/include/asm-x86/hvm/hvm.h      |    9 +
>  xen/include/asm-x86/hvm/vmx/vmcs.h |   35 +++++++
>  xen/include/asm-x86/hvm/vmx/vmx.h  |   53 ++++++++++-
>  xen/include/asm-x86/p2m.h          |   35 ++-----
>  xen/include/public/hvm/params.h    |    4
>  13 files changed, 521 insertions(+), 52 deletions(-)
> 
> Signed-off-by: Xin Li <xin.b.li@xxxxxxxxx>
> Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
> 
> Jun
> ---
> Intel Open Source Technology Center
> 
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