Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Sun, 21 Jan 2018 20:54:07 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     David Woodhouse <dwmw2@infradead.org>
Cc:     arjan@linux.intel.com, tglx@linutronix.de, karahmed@amazon.de,
        x86@kernel.org, linux-kernel@vger.kernel.org,
        tim.c.chen@linux.intel.com, peterz@infradead.org,
        pbonzini@redhat.com, ak@linux.intel.com,
        torvalds@linux-foundation.org, gregkh@linux-foundation.org
Subject: Re: [PATCH v2 5/8] x86/speculation: Add basic support for IBPB
Message-ID: <20180121195407.hbahkbmc37yrrvi4@pd.tnic>
References: <1516528149-9370-1-git-send-email-dwmw@amazon.co.uk>
 <1516528149-9370-6-git-send-email-dwmw@amazon.co.uk>
 <20180121180621.ufmc5m7nr6v4tjvc@pd.tnic>
 <1516560862.9814.47.camel@infradead.org>
 <20180121190430.ss22poeakvwzvcal@pd.tnic>
 <1516563099.9814.54.camel@infradead.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <1516563099.9814.54.camel@infradead.org>
User-Agent: NeoMutt/20170609 (1.8.3)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Sun, Jan 21, 2018 at 07:31:39PM +0000, David Woodhouse wrote:
> >         if (boot_cpu_has(X86_FEATURE_IBPB))
> >                 wrmsr(MSR_IA32_PRED_CMD, PRED_CMD_IBPB, 0);
> > 
> > Problem solved.
> 
> Nope. Plenty of patch sets *did* have the bug above though, until it
> was spotted.

And that bug is...?

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.