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Hi Mike, On Tue, Aug 25, 2020 at 12:21:03AM +0000, Mike Stunes wrote: > Thanks for the new update! I still see the same FSGSBASE behavior on our platform. > > That is, APs come up offline; masking out either FSGSBASE or RDPID from the > guest's CPUID results in all CPUs online. > > Is that still expected with this patch set? (As you mentioned in an earlier reply, > I?m testing on a Rome system.) The RDPID fix (removing RDPID usage from paranoid_entry) is probably not yet merged into the base you have b...

...after boot. I?ll spend > some time seeing if I can figure out what the problem is. Thanks! Tom and a few others debugged another FSGSBASE issue yesterday, which I think might also be the cause for the AP startup problems you are seeing (if you test on Rome). Can you try to disable support for RDPID in the guest, but keep fsgsbase enabled? Thanks, Joerg

...e4.1 sse4.2 x2apic movbe popcnt tsc-deadline aes xsave osxsave avx f16c rdrand hypervisor fsgsbase tsc-adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap avx512ifma pcommit clflushopt clwb avx512pf avx512er avx512cd avx512bw avx512vl avx512vbmi umip pku ospke rdpid avx512-4vnniw avx512-4fmaps syscall nx mmxext fxsr-opt pdpe1gb rdtscp lm 3dnowext 3dnow lahf-lm cmp-legacy svm extapic cr8legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid-msr tbm topoext perfctr-core perfctr-nb invtsc xstore xstore-en xcrypt xcry...