Re: [RFC PATCH 00/35] SEV-ES hypervisor support

[Paolo Bonzini]

On 30/11/20 20:35, Sean Christopherson wrote:
> > Delayed interrupts are fine, since they are injected according to RVI and
> > the posted interrupt descriptor.  I'm thinking more of events (exceptions
> > and interrupts) that caused an EPT violation exit and were recorded in the
> > IDT-vectored info field.
> Ah.  As is, I don't believe KVM has access to this information.  TDX-Module
> handles the actual EPT violation, as well as event reinjection.  The EPT
> violation reported by SEAMRET is synthesized, and IIRC the IDT-vectoring field
> is not readable.
>
> Regardless, is there an actual a problem with having a "pending" exception that
> isn't reported to userspace?  Obviously the info needs to be migrated, but that
> will be taken care of by virtue of migrating the VMCS.

No problem, I suppose we would just have to get used to not being able 
to look into the state of migrated VMs.

Paolo