[PATCH v2 0/6] add xsaves/xrstors support

[Shuai Ruan <shuai.ruan@intel.com>]

Changes in v2:
* Address comments from Andrew/chao/Jan, mainly:
* Add details information of xsaves/xrstors feature.
* Remove XGETBV1/XSAVEC/XSAVEOPT out of 'else' in patch 3.
* Change macro name XGETBV to XGETBV1 in patch 4.

This patchset enable xsaves/xrstors feature which will be available on 
Intel Skylake and later platform. Like xsave/xrstor, xsaves/xrstors 
feature will save and load processor state from a region of memory called 
XSAVE area. While unlike xsave/xrstor, xsaves/xrstors:

a) use the compacted format only for the extended region 
   of the XSAVE area which saves memory for you;
b) can operate on supervisor state components so the feature
   is prerequisite to support new supervisor state components;
c) execute only if CPL=0. 

Detail hardware spec can be found in chapter 13 (section 13.11 13.12) of the 
Intel SDM [1].

patch1: add xsaves/xrstors support for pv guest
patch2: add xsaves/xrstors support for xen
patch3-5: add xsaves/xrstors support for hvm guest
patch6: swtich on detection of xsaves/xrstors/xgetbv in xen

[1] Intel SDM (http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-manual-325462.pdf)

Shuai Ruan (6):
  x86/xsaves: enable xsaves/xrstors for pv guest
  x86/xsaves: enable xsaves/xrstors in xen
  x86/xsaves: enable xsaves/xrstors for hvm guest
  libxc: expose xsaves/xgetbv1/xsavec to hvm guest
  x86/xsaves: support compact format for hvm save/restore
  x86/xsaves: detect xsaves/xgetbv1 in xen

 tools/libxc/xc_cpuid_x86.c         |   8 +-
 xen/arch/x86/domain.c              |   6 +
 xen/arch/x86/hvm/hvm.c             |  55 +++++++-
 xen/arch/x86/hvm/vmx/vmcs.c        |   7 +-
 xen/arch/x86/hvm/vmx/vmx.c         |  18 +++
 xen/arch/x86/i387.c                |   5 +
 xen/arch/x86/traps.c               |  87 +++++++++++++
 xen/arch/x86/x86_64/mm.c           |  52 ++++++++
 xen/arch/x86/xstate.c              | 259 +++++++++++++++++++++++++++++++------
 xen/include/asm-x86/domain.h       |   1 +
 xen/include/asm-x86/hvm/vmx/vmcs.h |   5 +
 xen/include/asm-x86/hvm/vmx/vmx.h  |   2 +
 xen/include/asm-x86/mm.h           |   1 +
 xen/include/asm-x86/msr-index.h    |   2 +
 xen/include/asm-x86/xstate.h       |  15 ++-
 15 files changed, 475 insertions(+), 48 deletions(-)

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1.9.1