On Thu, 2026-05-21 at 15:30 -0700, Sean Christopherson wrote: > On Thu, May 21, 2026, David Woodhouse wrote: > > On Sat, 2026-05-09 at 23:46 +0100, David Woodhouse wrote: > > > From: David Woodhouse <[email protected]> > > That does leave userspace still needing a way to get the APIC bus > > frequency, to populate CPUID. So maybe I'll just make an attribute > > which returns that as a single value. > > Already exists, KVM_CAP_X86_APIC_BUS_CYCLES_NS. The TDX architecture decided > that unconditionally telling guests the virtual APIC bus runs at 400Mhz was a > brilliant idea.
Ah, thanks. So KVM always exposes 1GHz by default regardless of the actual host? Which is why there's no *get* method? (Well... getting KVM_CAP_APIC_BUS_CYCLES_NS returns APIC_BUS_CYCLE_NS_DEFAULT which is 1, so it's basically just returning 1 like a lot of cap queries do, and *not* returning what the period is actually set to)
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