linux-kernel - RE: [PATCH v2] Linux VM workaround for Knights Landing A/D leak

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Date:	Wed, 15 Jun 2016 13:12:13 +0000
From:	"Anaczkowski, Lukasz" <lukasz.anaczkowski@...el.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"mhocko@...e.com" <mhocko@...e.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"Srinivasappa, Harish" <harish.srinivasappa@...el.com>,
	"Odzioba, Lukasz" <lukasz.odzioba@...el.com>,
	"Andrejczuk, Grzegorz" <grzegorz.andrejczuk@...el.com>,
	"Daniluk, Lukasz" <lukasz.daniluk@...el.com>
Subject: RE: [PATCH v2] Linux VM workaround for Knights Landing A/D leak

From: Borislav Petkov [mailto:bp@...en8.de] 
Sent: Tuesday, June 14, 2016 8:10 PM

>> +	if (boot_cpu_has_bug(X86_BUG_PTE_LEAK))
>
> static_cpu_has_bug()

>> +	if (c->x86_model == 87) {
>
> That should be INTEL_FAM6_XEON_PHI_KNL, AFAICT.

>> +		static bool printed;
>> +
>> +		if (!printed) {
>> +			pr_info("Enabling PTE leaking workaround\n");
>> +			printed = true;
>> +		}
>
> pr_info_once

Thanks, Boris! This is very valuable. I'll address  those comments in next version of the patch.

Cheers,
Lukasz