LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Ingo Molnar <mingo@kernel.org>
To: Greg KH <greg@kroah.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, Vince Weaver <vince@deater.net>,
	torvalds@linux-foundation.org, robert@swiecki.net,
	luto@amacapital.net, hughd@google.com,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: Re: [PATCH] x86,perf: Disable intel_bts when PTI
Date: Sun, 14 Jan 2018 13:54:44 +0100
Message-ID: <20180114125444.uqr53c6ryfn5hd53@gmail.com> (raw)
In-Reply-To: <20180114105003.GA30927@kroah.com>


* Greg KH <greg@kroah.com> wrote:

> On Sun, Jan 14, 2018 at 11:27:13AM +0100, Peter Zijlstra wrote:
> > 
> > The intel_bts driver does not use the 'normal' BTS buffer we allocated
> > space for in the cpu_entry_area but instead uses the memory allocated
> > for the perf AUX buffer.
> > 
> > This obviously comes apart when using PTI because then the kernel
> > mapping; which includes that AUX buffer memory; disappears.
> > 
> > For now disable this driver when PTI is enabled, we'll try and sort
> > something out later.
> > 
> > Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> > Reported-by: Vince Weaver <vincent.weaver@maine.edu>
> > Reported-by: Robert Święcki <robert@swiecki.net>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> 
> Can you add a:
> 	Cc: stable <stable@vger.kernel.org>
> please?

Note that these fixes are all going into tip:x86/pti, which is still a backporting 
friendly linear set of commits that should all be backported.

So once 99a9dc98ba52 goes upstream, all of v4.14..99a9dc98ba52 the remaining bits 
can go to -stable as well.

Will keep you updated about the latest status periodically, right now the latest 
that is already upstream is:

  de791821c295: x86/pti: Rename BUG_CPU_INSECURE to BUG_CPU_MELTDOWN

i.e. all 194 commits in the v4.14..de791821c295 range should be queued up for 
-stable. (And most of them already are.)

There are 28 new commits in tip:x86/pti that will (hopefully) go upstream later 
today.

Thanks,

	Ingo

  parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-14 10:27 Peter Zijlstra
2018-01-14 10:46 ` [tip:x86/pti] " tip-bot for Peter Zijlstra
2018-01-14 10:50 ` [PATCH] " Greg KH
2018-01-14 10:52   ` Thomas Gleixner
2018-01-14 12:54   ` Ingo Molnar [this message]
2018-01-14 13:27     ` Greg KH

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180114125444.uqr53c6ryfn5hd53@gmail.com \
    --to=mingo@kernel.org \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=greg@kroah.com \
    --cc=hughd@google.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@amacapital.net \
    --cc=peterz@infradead.org \
    --cc=robert@swiecki.net \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    --cc=vince@deater.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git