KVM: x86: Add a helper to check kernel support when setting cpu cap
Add a helper, kvm_cpu_cap_check_and_set(), to query boot_cpu_has() as part of setting a KVM cpu capability. VMX in particular has a number of features that are dependent on both a VMCS capability and kernel support. No functional change intended. Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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