lkml.org 
[lkml]   [2018]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH v5 5/7] x86/pti: Do not enable PTI on processors which are not vulnerable to Meltdown
    From
    Date
    On 01/25/2018 08:14 AM, David Woodhouse wrote:
    > +static bool __init early_cpu_vulnerable_meltdown(struct cpuinfo_x86 *c)
    > +{
    > + u64 ia32_cap = 0;
    > +
    > + if (x86_match_cpu(cpu_no_meltdown))
    > + return false;
    > +
    > + if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES))
    > + rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
    > +
    > + /* Rogue Data Cache Load? No! */
    > + if (ia32_cap & ARCH_CAP_RDCL_NO)
    > + return false;
    > +
    > + return true;
    > +}

    Feel free to add my ack on this. It looks fine to me. I'll test and
    submit any necessary fixes once I actually get a system that has this bit.

    \
     
     \ /
      Last update: 2018-01-25 19:11    [W:11.769 / U:0.172 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site