Re: [Xen-devel] [PATCH 0/3] x86/svm: virtual VMLOAD/VMSAVE

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 10/31/2017 06:03 PM, brian.woods@xxxxxxx wrote:
> From: Brian Woods <brian.woods@xxxxxxx>
>
> x86/svm: virtual VMLOAD/VMSAVE
>
> On AMD family 17h server processors, there is a feature called virtual
> VMLOAD/VMSAVE.  This allows a nested hypervisor to preform a VMLOAD or
> VMSAVE without needing to be intercepted by the host hypervisor.
> Virtual VMLOAD/VMSAVE requires the host hypervisor to be in long mode
> and nested page tables to be enabled.  For more information about it
> please see:
>
> AMD64 Architecture Programmer’s Manual Volume 2: System Programming
> http://support.amd.com/TechDocs/24593.pdf
> Section: VMSAVE and VMLOAD Virtualization (Section 15.33.1)
>
> This patch series adds support to check for and enable the virtual
> VMLOAD/VMSAVE features if available.
>
> Signed-off-by: Brian Woods <brian.woods@xxxxxxx>
>
> Brian Woods (3):
>   x86/svm: rename lbr control field in vmcb
>   x86/svm: add virtual VMLOAD/VMSAVE feature definition
>   x86/svm: add virtual VMLOAD/VMSAVE support
>
>  xen/arch/x86/hvm/svm/nestedsvm.c        | 10 +++++-----
>  xen/arch/x86/hvm/svm/svm.c              |  3 ++-
>  xen/arch/x86/hvm/svm/svmdebug.c         |  2 ++
>  xen/arch/x86/hvm/svm/vmcb.c             |  7 +++++++
>  xen/include/asm-x86/hvm/svm/nestedsvm.h |  4 ++--
>  xen/include/asm-x86/hvm/svm/svm.h       |  2 ++
>  xen/include/asm-x86/hvm/svm/vmcb.h      |  7 ++++---
>  7 files changed, 24 insertions(+), 11 deletions(-)
>


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

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