Re: [PATCH v2 00/25] Enable FRED with KVM VMX

[Sean Christopherson]

On Wed, Mar 27, 2024, Shan Kang wrote:
> On Wed, 2024-02-07 at 09:26 -0800, Xin Li wrote:
> > This patch set enables the Intel flexible return and event delivery
> > (FRED) architecture with KVM VMX to allow guests to utilize FRED.
> > 
> We tested this FRED KVM patch set on a 7th Intel(R) Core(TM) CPU and the Intel 
> Simics® Simulator with the following four configurations:

That likely provides coverage for the happy cases, but I doubt it provides negative
testing, e.g. for VM-Enter consistency checks.  KVM-Unit-Tests are currently the
best choice for concistency checks (unfortunately).

And given the insanity of event re-injection, KVM selftests needs a dedicated test
for that, and another for the interactions with nVMX, e.g. a la svm_nested_soft_inject_test.c.

I haven't looked too closely at the selftest that's already provided, but my
suspicion is that we'll want multiple tests, or alternatively one test that
uses KVM_ONE_VCPU_TEST_SUITE().