• Sean Christopherson's avatar
    x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_* · 14442a15
    Sean Christopherson authored
    Add support for generating VMX feature names in capflags.c and use the
    resulting x86_vmx_flags to print the VMX flags in /proc/cpuinfo.  Don't
    print VMX flags if no bits are set in word 0, which holds Pin Controls.
    Pin Control's INTR and NMI exiting are fundamental pillars of VMX, if
    they are not supported then the CPU is broken, it does not actually
    support VMX, or the kernel wasn't built with support for the target CPU.
    
    Print the features in a dedicated "vmx flags" line to avoid polluting
    the common "flags" and to avoid having to prefix all flags with "vmx_",
    which results in horrendously long names.
    
    Keep synthetic VMX flags in cpufeatures to preserve /proc/cpuinfo's ABI
    for those flags.  This means that "flags" and "vmx flags" will have
    duplicate entries for tpr_shadow (virtual_tpr), vnmi, ept, flexpriority,
    vpid and ept_ad, but caps the pollution of "flags" at those six VMX
    features.  The vendor-specific code that populates the synthetic flags
    will be consolidated in a future patch to further minimize the lasting
    damage.
    Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
    Link: https://lkml.kernel.org/r/20191221044513.21680-12-sean.j.christopherson@intel.com
    14442a15
mkcapflags.sh 1.83 KB