On 05/22/2018 03:41 AM, Adam Carter wrote: > On Tue, May 22, 2018 at 2:47 PM, taii...@gmx.com > <mailto:taii...@gmx.com> <taii...@gmx.com <mailto:taii...@gmx.com>> wrote: > > The fam15h microcode update adds IBPB > > * Indirect Branch Prediction Barrier (IBPB) > * PRED_CMD MSR is available: YES > * CPU indicates IBPB capability: YES (IBPB_SUPPORT feature bit) > > > My fam15 with kernel 4.16.10 and linux-firmware-20180518 confirms IBPB > has been added; > > $ grep . /sys/devices/system/cpu/vulnerabilities/* > /sys/devices/system/cpu/vulnerabilities/meltdown:Not affected > /sys/devices/system/cpu/vulnerabilities/spectre_v1:Mitigation: __user > pointer sanitization > /sys/devices/system/cpu/vulnerabilities/spectre_v2:Mitigation: Full > AMD retpoline, IBPB > > FWIW i saw a bunch of spectre fixes in 4.16.9 > https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.16.9 . I cat'd /proc/cpuinfo before and after the firmware upgrade.
The new smaller Fam15h firmware adds "ibpb" and removes "lwp". Couldn't / Didn't really find a definition of WHAT the 'lwp' instruction(s) does. Is 'lwp' used for anything? Corbin
