Re: Encrypted Message

On Mon, 4 Mar 2019, speck for Jon Masters wrote:

> On 3/1/19 4:47 PM, speck for Thomas Gleixner wrote:
> >       if (static_branch_unlikely(&vmx_l1d_should_flush))
> >               vmx_l1d_flush(vcpu);
> > +     else if (static_branch_unlikely(&mds_user_clear))
> > +             mds_clear_cpu_buffers();
> 
> Does this cover the case where we have older ucode installed that does
> L1D flush but NOT the MD_CLEAR? I'm about to go check to see if there's
> logic handling this but wanted to call it out.

If no updated microcode is available then it's pretty irrelevant which code
path you take. None of them will mitigate MDS.

Thanks,

	tglx