Re: [PATCH v2 0/2] Virtual GIF

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

On 11/16/2017 12:19 PM, Brian Woods wrote:
> 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        | 12 ++++++++++++
>  xen/include/asm-x86/hvm/svm/svm.h  |  2 ++
>  xen/include/asm-x86/hvm/svm/vmcb.h |  6 ++++--
>  5 files changed, 25 insertions(+), 3 deletions(-)
>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

(with or without 'else' style changes in the second patch)

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