On 7/27/2017 12:34 PM, Linus Torvalds wrote: > On Thu, Jul 27, 2017 at 7:15 AM, Tom Lendacky <thomas.lendacky at 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 >
