On Mon, Jan 15, 2018 at 01:43:22PM +0800, Jia Zhang wrote: > Platform ID retrieved from MSR_IA32_PLATFORM_ID may be used as > a filtration condition in some cases. > > Signed-off-by: Jia Zhang <zhang....@linux.alibaba.com> > --- > arch/x86/include/asm/processor.h | 1 + > arch/x86/kernel/cpu/intel.c | 7 +++++++ > 2 files changed, 8 insertions(+) > > diff --git a/arch/x86/include/asm/processor.h > b/arch/x86/include/asm/processor.h > index d3a67fb..c0b4d47 100644 > --- a/arch/x86/include/asm/processor.h > +++ b/arch/x86/include/asm/processor.h > @@ -133,6 +133,7 @@ struct cpuinfo_x86 { > u16 cpu_index; > u32 microcode; > unsigned initialized : 1; > + u8 platform_id;
Platform ID in cpuinfo? Nope, I don't think so. > } __randomize_layout; > > struct cpuid_regs { > diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c > index b1af220..cee0554 100644 > --- a/arch/x86/kernel/cpu/intel.c > +++ b/arch/x86/kernel/cpu/intel.c > @@ -229,6 +229,13 @@ static void early_init_intel(struct cpuinfo_x86 *c) > } > > check_mpx_erratum(c); > + > + if ((c->x86 > 6) || (c->x86_model >= 5)) { > + u32 val[2]; > + > + rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); > + c->platform_id = 1 << ((val[1] >> 18) & 7); > + } collect_cpu_info() in arch/x86/kernel/cpu/microcode/intel.c already does that so you already have that info without duplicating it. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.