On Thu, Jun 9, 2022 at 9:16 PM Jim Mattson <jmattson@xxxxxxxxxx> wrote: > > On Thu, Jun 9, 2022 at 7:49 PM Like Xu <like.xu.linux@xxxxxxxxx> wrote: > > > RDPMC Intel Operation: Actually, the key phrase is also present in the pseudocode you quoted: > > MSCB = Most Significant Counter Bit (* Model-specific *) > > IF (((CR4.PCE = 1) or (CPL = 0) or (CR0.PE = 0)) and (ECX indicates a supported > > counter)) ... The final conjunct in that condition is false under KVM when !enable_pmu, because there are no supported counters.
