On Fri, 07 Dec 2018 18:39:22 +0000, Kristina Martsenko <[email protected]> wrote: > > From: Mark Rutland <[email protected]> > > In subsequent patches we're going to expose ptrauth to the host kernel > and userspace, but things are a bit trickier for guest kernels. For the > time being, let's hide ptrauth from KVM guests. > > Regardless of how well-behaved the guest kernel is, guest userspace > could attempt to use ptrauth instructions, triggering a trap to EL2, > resulting in noise from kvm_handle_unknown_ec(). So let's write up a > handler for the PAC trap, which silently injects an UNDEF into the > guest, as if the feature were really missing. > > Signed-off-by: Mark Rutland <[email protected]> > Signed-off-by: Kristina Martsenko <[email protected]> > Reviewed-by: Andrew Jones <[email protected]> > Reviewed-by: Christoffer Dall <[email protected]> > Cc: Marc Zyngier <[email protected]> > Cc: [email protected]
Reviewed-by: Marc Zyngier <[email protected]> M. -- Jazz is not dead, it just smell funny.
