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SubjectRe: [PATCH v11 7/9] KVM: X86: Add userspace access interface for CET MSRs
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On 26/04/20 17:23, Yang Weijiang wrote:
> What's the purpose of the selftest? Is it just for Shadow Stack SSP
> state transitions in various cases? e.g., L0 SSP<--->L3 SSP,
> L0 SSP1<--->L0 SSP2?

No, it checks that the whole state can be extracted and restored from a
running VM. For example, it would have caught immediately that the
current SSP could not be saved and restored.

> We now have the KVM unit-test for CET functionalities,
> i.e., Shadow Stack and Indirect Branch Tracking for user-mode, I can put the
> state test app into the todo list as current patchset is mainly for user-mode
> protection, the supervisor-mode CET protection is the next step.

What are the limitations? Or are you referring to the unit test?

Paolo

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