lkml.org 
[lkml]   [2020]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC PATCH 00/35] SEV-ES hypervisor support
From
Date
On 11/30/20 9:31 AM, Paolo Bonzini wrote:
> 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?

SEV-SNP has support for restricting injections, but SEV-ES does not.
Perhaps a new boolean, guest_restricted_injection, can be used instead of
basing it on guest_state_protected.

Thanks,
Tom

>
> Paolo
>

\
 
 \ /
  Last update: 2020-11-30 17:09    [W:0.286 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site