Re: [PATCH v3 25/75] x86/sev-es: Add support for handling IOIO exceptions
From: Sean Christopherson
Date: Thu Jun 04 2020 - 10:59:39 EST
On Thu, Jun 04, 2020 at 12:15:02PM +0200, Joerg Roedel wrote:
> On Wed, Jun 03, 2020 at 04:07:16PM -0700, Sean Christopherson wrote:
> > On Wed, Jun 03, 2020 at 04:23:25PM +0200, Joerg Roedel wrote:
> > > User-space can also cause IOIO #VC exceptions, and user-space can be
> > > 32-bit legacy code with segments, so es_base has to be taken into
> > > account.
> > Is there actually a use case for this? Exposing port IO to userspace
> > doesn't exactly improve security.
> Might be true, but Linux supports it and this patch-set is not the place
> to challenge this feature.
But SEV already broke it, no?