On 7/27/2017 12:34 PM, Linus Torvalds wrote:
On Thu, Jul 27, 2017 at 7:15 AM, Tom Lendacky <thomas.lenda...@amd.com> wrote:
I can #ifdef the wbinvd based on whether AMD_MEM_ENCRYPT is configured
or not so that the wbinvd is avoided if not configured.
I suspect an ifdef will be useless, since things like distro kernels
tend to enable everything.
So it should probably be disabled dynamically, and only done if the
AMD memory encryption thing has actually been active.
[ There have also been various actual errata with wbinvd, so there
tends to be a non-performance reason to try to avoid it unless
strictly required ]
Ok, I'll make the wbinvd a run time decision based on whether SME is
active at the time.
Thanks,
Tom
Linus
