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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 01/11/17 17:00, Boris Ostrovsky wrote:
> 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>

I've given these a spin on my Zen box, although nothing nested-virt
specific.

I've pulled the series into x86-next.

~Andrew

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