linux-kernel - Re: [PATCH v2 1/5] x86: Detection of Knights Landing A/D leak

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Message-ID: <670B2DF9-204C-4A56-92C0-EC52CBF160E3@vmware.com>
Date:   Tue, 26 Oct 2021 15:57:47 +0000
From:   Nadav Amit <namit@...are.com>
To:     Dave Hansen <dave.hansen@...el.com>
CC:     Linux-MM <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Xu <peterx@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        Nick Piggin <npiggin@...il.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v2 1/5] x86: Detection of Knights Landing A/D leak



> On Oct 26, 2021, at 8:54 AM, Dave Hansen <dave.hansen@...el.com> wrote:
> 
> On 10/21/21 5:21 AM, Nadav Amit wrote:
>> --- a/arch/x86/kernel/cpu/intel.c
>> +++ b/arch/x86/kernel/cpu/intel.c
>> @@ -296,6 +296,11 @@ static void early_init_intel(struct cpuinfo_x86 *c)
>> 		}
>> 	}
>> 
>> +	if (c->x86_model == 87) {
>> +		pr_info_once("Enabling PTE leaking workaround\n");
>> +		set_cpu_bug(c, X86_BUG_PTE_LEAK);
>> +	}
> 
> Please take a look at:
> 
> 	arch/x86/include/asm/intel-family.h
> 
> specifically:
> 
> #define INTEL_FAM6_XEON_PHI_KNL         0x57 /* Knights Landing */

Thanks, I will fix it. I really just copy pasted from Andi’s patch
(for better and worse).