On Tue, Jun 23, 2020 at 12:51:03PM +0100, Andrew Cooper wrote: > There are cases which are definitely non-recoverable. > > For both ES and SNP, a malicious hypervisor can mess with the guest > physmap to make the the NMI, #VC and #DF stacks all alias. > > For ES, this had better result in the #DF handler deciding that crashing > is the way out, whereas for SNP, this had better escalate to Shutdown. > Crashing out hard if the hypervisor is misbehaving is acceptable. Then I'm thinking the only sensible option is to crash hard for any SNP #VC from kernel mode. Sadly that doesn't help with #VC needing to be IST :-( IST is such a frigging nightmare.
