On 2025-06-20 16:18, Sean Christopherson wrote:

quoted

So I was thinking about this, and wonder: how expensive is it to get the
event data exit information out of VMX? If it is not very expensive, it
would arguably be a good thing to future-proof by fetching that information,
even if it is currently always zero.

It's trivially easy to do in KVM, and the cost of the VMREAD should be less than
20 cycles.  So quite cheap in the grand scheme.  If VMREAD is more costly than
that, then we have bigger problems :-)

LOL. Since it is up to you, Paulo, etc. to decide how to do the 
tradeoffs formaintainability, debuggability and performance in KVM I am 
guessing this is a vote in favor? (You can always take it out if it is a 
performance problem, until such time that the kernel itself starts 
consuming this information for reasons currently unknown.)

	-hpa