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

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Message-ID: <e96dc19c-b289-7e5d-4a0a-4609214a9818@intel.com>
Date:   Tue, 26 Oct 2021 08:54:46 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Nadav Amit <nadav.amit@...il.com>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, Nadav Amit <namit@...are.com>,
        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
Subject: Re: [PATCH v2 1/5] x86: Detection of Knights Landing A/D leak

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 */