Re: [PATCH V2 06/12] virtio_pci: harden MSI-X interrupts

Michael S. Tsirkin
2021-10-20T06:56:36Z

On Wed, Oct 20, 2021 at 09:33:49AM +0800, Jason Wang wrote:
> > In my own opinion, the threat model is:
> >
> > Attacker: 'malicious' hypervisor
> >
> > Victim: VM with SEV/TDX/SGX
> >
> > The attacker should not be able to steal secure/private data from VM, when the
> > hypervisor's action is unexpected. DoS is out of the scope.
> >
> > My concern is: it is very hard to clearly explain in the patchset how the
> > hypervisor is able to steal VM's data, by setting queue=0 or injecting unwanted
> > interrupts to VM.
>
> Yes, it's a hard question but instead of trying to answer that, we can
> just fix the case of e.g unexpected interrupts.
>
> Thanks

I think this it's still early days for TDX. So it's a bit early to talk
about threat models, start opening CVEs and distinguishing between
security and non-security bugs.

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MST