On Mon, Aug 22, 2016 at 07:24:07PM -0400, Brijesh Singh wrote:
> From: Tom Lendacky <thomas.lenda...@amd.com>
> 
> When a guest causes a NPF which requires emulation, KVM sometimes walks
> the guest page tables to translate the GVA to a GPA. This is unnecessary
> most of the time on AMD hardware since the hardware provides the GPA in
> EXITINFO2.
> 
> The only exception cases involve string operations involving rep or
> operations that use two memory locations. With rep, the GPA will only be
> the value of the initial NPF and with dual memory locations we won't know
> which memory address was translated into EXITINFO2.
> 
> Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
> ---
>  arch/x86/include/asm/kvm_emulate.h |    3 +++
>  arch/x86/include/asm/kvm_host.h    |    3 +++
>  arch/x86/kvm/svm.c                 |    2 ++
>  arch/x86/kvm/x86.c                 |   17 ++++++++++++++++-
>  4 files changed, 24 insertions(+), 1 deletion(-)

FWIW, LGTM. (Gotta love replying in acronyms :-))

Reviewed-by: Borislav Petkov <b...@suse.de>

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imend├Ârffer, Jane Smithard, Graham Norton, HRB 21284 
(AG N├╝rnberg)
-- 
_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Reply via email to