Re: [PATCH v4 09/25] KVM: VMX: nVMX: Support TSC scaling and PERF_GLOBAL_CTRL with enlightened VMCS

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On 7/29/22 00:13, Sean Christopherson wrote:
The only flaw in this is if KVM gets handed a CPUID model that enumerates support
for 2025 (or whenever the next update comes) but not 2022.  Hmm, though if Microsoft
defines each new "version" as a full superset, then even that theoretical bug goes
away.  I'm happy to be optimistic for once and give this a shot.  I definitely like
that it makes it easier to see the deltas between versions.

Okay, I have queued the series but I still haven't gone through all the comments. So this will _not_ be in the 5.21 pull request.

The first patch also needs a bit more thought to figure out the impact on userspace and whether we can consider syndbg niche enough to not care.

Paolo




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