[Xen-devel] [PATCH 0/2] Virtual GIF

[Brian Woods <brian.woods@xxxxxxx>]

On AMD family 17h processors, there is a feature called virtual GIF.
This allows a nested hypervisor to preform a CLGI or STGI without
needing to be intercepted by the host hypervisor.  For more information
about it please see:

AMD64 Architecture Programmer’s Manual Volume 2: System Programming
http://support.amd.com/TechDocs/24593.pdf
Section: Virtual GIF (Section 15.33.2)

This patch series adds support to check for and enable the virtual
GIF features if available.

These patches were tested on a AMD family 17h (EPYC 7401) system.

Brian Woods (2):
  x86/svm: Add virtual GIF feature definition
  x86/svm: Add virtual GIF support

 xen/arch/x86/hvm/svm/nestedsvm.c   | 7 ++++++-
 xen/arch/x86/hvm/svm/svm.c         | 1 +
 xen/arch/x86/hvm/svm/vmcb.c        | 9 +++++++++
 xen/include/asm-x86/hvm/svm/svm.h  | 2 ++
 xen/include/asm-x86/hvm/svm/vmcb.h | 6 ++++--
 5 files changed, 22 insertions(+), 3 deletions(-)

-- 
2.11.0


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