Messages in this thread | | | Date | Fri, 22 Jul 2022 12:13:23 -0700 | Subject | Re: [PATCH v8 5/5] x86/tdx: Add Quote generation support | From | Dave Hansen <> |
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On 7/22/22 12:05, Isaku Yamahata wrote: >> So, the quote portion of this is basically a bidirectional blob sender. >> It's to send a blob between guest userspace to host userspace. >> >> Do we *REALLY* need specific driver functionality for this? For >> instance, is there no existing virtio device that can send blobs back >> and forth? > It's virtio-vsock. If virtio-vsock is available, the communication works. > However, some users would like to disable virtio-vsock on their environment for > some reasons. Even virtio at all. Especially for confidential computing use > case. It's their choice. It can't be assumed that virtio is available. > > The goal is VMM-agnostic (but TDX-specific) interface for that.
You're basically saying that every confidential computing technology should have its own host user <-> guest kernel <-> guest user ABI. That's insanity. If we do this, we need *one* interface that says "talk to the hypervisor" that's common for all hypervisors and hardware vendors, or at least more than *one*.
We don't need a way to talk to hypervisors for Intel systems and another for AMD and yet another on whatever.
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