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KVM: x86: Advertise CPUID.(EAX=7,ECX=2):EDX[5:0] to userspace
commit eefe5e6 upstream. The low five bits {INTEL_PSFD, IPRED_CTRL, RRSBA_CTRL, DDPD_U, BHI_CTRL} advertise the availability of specific bits in IA32_SPEC_CTRL. Since KVM dynamically determines the legal IA32_SPEC_CTRL bits for the underlying hardware, the hard work has already been done. Just let userspace know that a guest can use these IA32_SPEC_CTRL bits. The sixth bit (MCDT_NO) states that the processor does not exhibit MXCSR Configuration Dependent Timing (MCDT) behavior. This is an inherent property of the physical processor that is inherited by the virtual CPU. Pass that information on to userspace. Signed-off-by: Jim Mattson <jmattson@google.com> Reviewed-by: Chao Gao <chao.gao@intel.com> Link: https://lore.kernel.org/r/20231024001636.890236-1-jmattson@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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