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

["Nakajima, Jun" <jun.nakajima@xxxxxxxxx>]

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

ept.patch
Description: ept.patch

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