From: Nadav Amit <nadav.amit@gmail.com>
To: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "Anaczkowski, Lukasz" <lukasz.anaczkowski@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
"ak@linux.intel.com" <ak@linux.intel.com>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>,
"mhocko@suse.com" <mhocko@suse.com>,
Andrew Morton <akpm@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
"Srinivasappa, Harish" <harish.srinivasappa@intel.com>,
"Odzioba, Lukasz" <lukasz.odzioba@intel.com>,
"Andrejczuk, Grzegorz" <grzegorz.andrejczuk@intel.com>,
"Daniluk, Lukasz" <lukasz.daniluk@intel.com>
Subject: Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak
Date: Wed, 15 Jun 2016 13:26:46 -0700 [thread overview]
Message-ID: <E0403A01-57FD-4232-879F-4AF14873C57E@gmail.com> (raw)
In-Reply-To: <5761B630.7020502@linux.intel.com>
Dave Hansen <dave.hansen@linux.intel.com> wrote:
> On 06/15/2016 01:04 PM, Nadav Amit wrote:
>> Be careful here. According to the SDM when invalidating a huge-page,
>> each 4KB page needs to be invalidated separately. In practice, when
>> Linux invalidates 2MB/1GB pages it performs a full TLB flush. The
>> full flush may not be required on knights landing, and specifically
>> for the workaround, but you should check.
>
> Where do you get that? The SDM says: "they (TLB invalidation operations
> invalidate all TLB entries corresponding to the translation specified by
> the paging structures.”
You are absolutely correct. Last time I write something based on my
recollection of the SDM without re-reading again. Sorry.
Nadav
next prev parent reply other threads:[~2016-06-15 20:26 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-14 15:58 [PATCH] Linux VM workaround for Knights Landing A/D leak Lukasz Anaczkowski
2016-06-14 16:31 ` kbuild test robot
2016-06-14 16:47 ` Nadav Amit
2016-06-14 16:54 ` Anaczkowski, Lukasz
2016-06-14 17:01 ` [PATCH v2] " Lukasz Anaczkowski
2016-06-14 17:24 ` Dave Hansen
2016-06-14 18:34 ` One Thousand Gnomes
2016-06-14 18:54 ` Dave Hansen
2016-06-14 19:19 ` Borislav Petkov
2016-06-14 20:20 ` H. Peter Anvin
2016-06-14 20:47 ` Borislav Petkov
2016-06-14 20:54 ` H. Peter Anvin
2016-06-14 21:02 ` Borislav Petkov
2016-06-14 21:08 ` H. Peter Anvin
2016-06-14 21:13 ` H. Peter Anvin
2016-06-14 18:10 ` Borislav Petkov
2016-06-15 13:12 ` Anaczkowski, Lukasz
2016-06-14 18:38 ` Nadav Amit
2016-06-15 13:12 ` Anaczkowski, Lukasz
2016-06-15 20:04 ` Nadav Amit
2016-06-15 20:10 ` Dave Hansen
2016-06-15 20:26 ` Nadav Amit [this message]
2016-06-16 15:14 ` [PATCH v3] " Lukasz Anaczkowski
2016-06-16 16:43 ` Nadav Amit
2016-06-16 20:23 ` Dave Hansen
2016-06-14 17:18 ` [PATCH] " Dave Hansen
2016-06-14 20:16 ` Nadav Amit
2016-06-14 21:37 ` Dave Hansen
2016-06-15 2:20 ` Andy Lutomirski
2016-06-15 2:35 ` Nadav Amit
2016-06-15 2:36 ` Andy Lutomirski
2016-06-15 2:44 ` Nadav Amit
2016-06-15 3:09 ` Andy Lutomirski
2016-06-15 3:20 ` Nadav Amit
2016-06-14 16:58 ` kbuild test robot
2016-06-14 17:19 ` Dave Hansen
2016-06-15 13:06 ` Anaczkowski, Lukasz
2016-06-14 17:47 ` kbuild test robot
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