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@intel.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> Jun --- Intel Open Source Technology Center _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Keir Fraser
2007-Dec-13 09:30 UTC
Re: [Xen-devel] [PATCH] Enable EPT (Extended Page Table)
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@intel.com> 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@intel.com> > Signed-off-by: Jun Nakajima <jun.nakajima@intel.com> > > Jun > --- > Intel Open Source Technology Center > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel