Hide the AMD MONITORX/MWAITX capability.
Otherwise, recent Linux guests will use these instructions, resulting in #UD exceptions since bhyve doesn't implement MONITOR/MWAIT exits. This fixes boot-time hangs in recent Linux guests on Ryzen CPUs (and probably Bulldozer aka AMD FX as well). Reviewed by: kib MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=315364
@ -176,6 +176,9 @@ x86_emulate_cpuid(struct vm *vm, int vcpu_id,
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/* Don't advertise the OS visible workaround feature */
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regs[2] &= ~AMDID2_OSVW;
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/* Hide mwaitx/monitorx capability from the guest */
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regs[2] &= ~AMDID2_MWAITX;
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/*
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* Hide rdtscp/ia32_tsc_aux until we know how
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* to deal with them.
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