Paolo Bonzini <pbonzini@xxxxxxxxxx> writes: > 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). > Sure, I thought I'm the only interested person around but if there's hope for more this definitely sounds like a good idea) -- Vitaly
