• Fenghua Yu's avatar
    x86/cpufeatures: Combine word 11 and 12 into a new scattered features word · acec0ce0
    Fenghua Yu authored
    It's a waste for the four X86_FEATURE_CQM_* feature bits to occupy two
    whole feature bits words. To better utilize feature words, re-define
    word 11 to host scattered features and move the four X86_FEATURE_CQM_*
    features into Linux defined word 11. More scattered features can be
    added in word 11 in the future.
    
    Rename leaf 11 in cpuid_leafs to CPUID_LNX_4 to reflect it's a
    Linux-defined leaf.
    
    Rename leaf 12 as CPUID_DUMMY which will be replaced by a meaningful
    name in the next patch when CPUID.7.1:EAX occupies world 12.
    
    Maximum number of RMID and cache occupancy scale are retrieved from
    CPUID.0xf.1 after scattered CQM features are enumerated. Carve out the
    code into a separate function.
    
    KVM doesn't support resctrl now. So it's safe to move the
    X86_FEATURE_CQM_* features to scattered features word 11 for KVM.
    Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
    Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
    Cc: Aaron Lewis <aaronlewis@google.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Babu Moger <babu.moger@amd.com>
    Cc: "Chang S. Bae" <chang.seok.bae@intel.com>
    Cc: "Sean J Christopherson" <sean.j.christopherson@intel.com>
    Cc: Frederic Weisbecker <frederic@kernel.org>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jann Horn <jannh@google.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: kvm ML <kvm@vger.kernel.org>
    Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Nadav Amit <namit@vmware.com>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
    Cc: Peter Feiner <pfeiner@google.com>
    Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
    Cc: "Radim Krčmář" <rkrcmar@redhat.com>
    Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
    Cc: Ravi V Shankar <ravi.v.shankar@intel.com>
    Cc: Sherry Hurwitz <sherry.hurwitz@amd.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Thomas Lendacky <Thomas.Lendacky@amd.com>
    Cc: x86 <x86@kernel.org>
    Link: https://lkml.kernel.org/r/1560794416-217638-2-git-send-email-fenghua.yu@intel.com
    acec0ce0
cpufeature.h 8.17 KB