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    x86/cpufeatures: Add FDP_EXCPTN_ONLY and ZERO_FCS_FDS · 670fb965
    Aaron Lewis 提交于
    [ Upstream commit cbb99c0f588737ec98c333558922ce47e9a95827 ]
    
    Add the CPUID enumeration for Intel's de-feature bits to accommodate
    passing these de-features through to kvm guests.
    
    These de-features are (from SDM vol 1, section 8.1.8):
     - X86_FEATURE_FDP_EXCPTN_ONLY: If CPUID.(EAX=07H,ECX=0H):EBX[bit 6] = 1, the
       data pointer (FDP) is updated only for the x87 non-control instructions that
       incur unmasked x87 exceptions.
     - X86_FEATURE_ZERO_FCS_FDS: If CPUID.(EAX=07H,ECX=0H):EBX[bit 13] = 1, the
       processor deprecates FCS and FDS; it saves each as 0000H.
    Signed-off-by: NAaron Lewis <aaronlewis@google.com>
    Signed-off-by: NBorislav Petkov <bp@suse.de>
    Reviewed-by: NJim Mattson <jmattson@google.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: Frederic Weisbecker <frederic@kernel.org>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Cc: marcorr@google.com
    Cc: Peter Feiner <pfeiner@google.com>
    Cc: pshier@google.com
    Cc: Robert Hoo <robert.hu@linux.intel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Thomas Lendacky <Thomas.Lendacky@amd.com>
    Cc: x86-ml <x86@kernel.org>
    Link: https://lkml.kernel.org/r/20190605220252.103406-1-aaronlewis@google.comSigned-off-by: NSasha Levin <sashal@kernel.org>
    670fb965
cpufeatures.h 24.0 KB