KVM: selftests: Add a basic SEV smoke test

Add a basic smoke test for SEV guests to verify that KVM can launch an
SEV guest and run a few instructions without exploding.  To verify that
SEV is indeed enabled, assert that SEV is reported as enabled in
MSR_AMD64_SEV, a.k.a. SEV_STATUS, which cannot be intercepted by KVM
(architecturally enforced).

Cc: Paolo Bonzini <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Vishal Annapurve <[email protected]>
Cc: Ackerly Tng <[email protected]>
cc: Andrew Jones <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: Michael Roth <[email protected]>
Suggested-by: Michael Roth <[email protected]>
Tested-by: Carlos Bilbao <[email protected]>
Signed-off-by: Peter Gonda <[email protected]>
[sean: rename to "sev_smoke_test"]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

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