Re: Should SEV-ES #VC use IST? (Re: [PATCH] Allow RDTSC and RDTSCP from userspace)

Peter Zijlstra
2020-06-23T16:14:14Z

On Tue, Jun 23, 2020 at 09:03:56AM -0700, Dave Hansen wrote:
> On 6/23/20 8:52 AM, Peter Zijlstra wrote:
> > Isn't current #MC unconditionally fatal from kernel? But yes, I was
> > sorta aware people want that changed.
>
> Not unconditionally. copy_to_iter_mcsafe() is a good example of one
> thing we _can_ handle.

Urgh, I thought that stuff was still pending.

Anyway, the important thing is that it is fatal if we hit early NMI.
Which I think still holds.