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

[Paolo Bonzini]

On 16/09/20 02:19, Sean Christopherson wrote:
> TDX also selectively blocks/skips portions of other ioctl()s so that the
> TDX code itself can yell loudly if e.g. .get_cpl() is invoked.  The event
> injection restrictions are due to direct injection not being allowed (except
> for NMIs); all IRQs have to be routed through APICv (posted interrupts) and
> exception injection is completely disallowed.
>
>    kvm_vcpu_ioctl_x86_get_vcpu_events:
> 	if (!vcpu->kvm->arch.guest_state_protected)
>          	events->interrupt.shadow = kvm_x86_ops.get_interrupt_shadow(vcpu);

Perhaps an alternative implementation can enter the vCPU with immediate 
exit until no events are pending, and then return all zeroes?

Paolo