On 20/06/19 13:02, Vitaly Kuznetsov wrote: > > P.S. If you'd like to test the series you'll have to have a CPU without > NRIP_SAVE feature or forcefully disable it, something like: > > index 8d4e50428b68..93c7eaad7915 100644 > --- a/arch/x86/kernel/cpu/amd.c > +++ b/arch/x86/kernel/cpu/amd.c > @@ -922,6 +922,9 @@ static void init_amd(struct cpuinfo_x86 *c) > /* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */ > if (!cpu_has(c, X86_FEATURE_XENPV)) > set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); > + > + /* No nrips */ > + clear_cpu_cap(c, X86_FEATURE_NRIPS); > } > > #ifdef CONFIG_X86_32 Let's add a module parameter instead. Patch sent (forgot to Cc you). Paolo
