Re: [PATCH] KVM: X86: Allow userspace to define the microcode version

[Konrad Rzeszutek Wilk]

On Mon, Feb 26, 2018 at 08:37:11PM +0100, Borislav Petkov wrote:
> On Mon, Feb 26, 2018 at 09:39:12AM -0500, Konrad Rzeszutek Wilk wrote:
> > diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
> > index d19e903214b4..87d044ce837f 100644
> > --- a/arch/x86/kernel/cpu/intel.c
> > +++ b/arch/x86/kernel/cpu/intel.c
> > @@ -144,6 +144,13 @@ static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
> >  {
> >  	int i;
> >  
> > +	/*
> > +	 * We know that the hypervisor lie to us on the microcode version so
> > +	 * we may as well trust that it is running the correct version.
> > +	 */
> > +	if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
> 
> I guess
> 
> 	cpu_has(c, X86_FEATURE_HYPERVISOR)
> 
> since we're passing a ptr to the current CPU.

Ah yes. Let me fix it up and repost.