Re: [PATCH 0/1] x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-on STIBP

2020-11-01 Thread Anand K. Mistry
On Sun, 1 Nov 2020 at 01:50, Tom Lendacky wrote: > > On 10/29/20 1:51 AM, Anand K Mistry wrote: > > When attempting to do some performance testing of IBPB on and AMD > > platform, I noticed the IBPB instruction was never being issued, even > > though it was conditionally on and various seccomp pro

Re: [PATCH 0/1] x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-on STIBP

2020-10-31 Thread Tom Lendacky
On 10/29/20 1:51 AM, Anand K Mistry wrote: When attempting to do some performance testing of IBPB on and AMD platform, I noticed the IBPB instruction was never being issued, even though it was conditionally on and various seccomp protected processes were force enabling it. Turns out, on those AMD

[PATCH 0/1] x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-on STIBP

2020-10-29 Thread Anand K Mistry
When attempting to do some performance testing of IBPB on and AMD platform, I noticed the IBPB instruction was never being issued, even though it was conditionally on and various seccomp protected processes were force enabling it. Turns out, on those AMD CPUs, STIBP is set to always-on and this was