From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <gregkh@linuxfoundation.org>
Subject: Re: [PATCH 22/24] KVM/x86: Remove indirect MSR op calls from
 SPEC_CTRL
Date: Wed, 25 Apr 2018 16:26:27 +0200
Message-ID: <20180425142627.GG25610@kroah.com>
References: <1524021512-24022-1-git-send-email-youquan.song@intel.com>
 <1524021512-24022-23-git-send-email-youquan.song@intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Cc: stable@vger.kernel.org, tim.c.chen@linux.intel.com,
        ashok.raj@intel.com, dave.hansen@intel.com,
        yi.y.sun@linux.intel.com, youquan.song@linux.intel.com,
        Paolo Bonzini <pbonzini@redhat.com>,
        David Woodhouse <dwmw@amazon.co.uk>,
        KarimAllah Ahmed <karahmed@amazon.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, kvm@vger.kernel.org
To: Youquan Song <youquan.song@intel.com>
Return-path: <stable-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <1524021512-24022-23-git-send-email-youquan.song@intel.com>
Sender: stable-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On Wed, Apr 18, 2018 at 11:18:30AM +0800, Youquan Song wrote:
> From: Paolo Bonzini <pbonzini@redhat.com>
> 
> commit ecb586bd29c99fb4de599dec388658e74388daad upstream.
> 
> Having a paravirt indirect call in the IBRS restore path is not a
> good idea, since we are trying to protect from speculative execution
> of bogus indirect branch targets.  It is also slower, so use
> native_wrmsrl() on the vmentry path too.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Reviewed-by: Jim Mattson <jmattson@google.com>
> Cc: David Woodhouse <dwmw@amazon.co.uk>
> Cc: KarimAllah Ahmed <karahmed@amazon.de>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: kvm@vger.kernel.org
> Cc: stable@vger.kernel.org
> Fixes: d28b387fb74da95d69d2615732f50cceb38e9a4d
> Link: http://lkml.kernel.org/r/20180222154318.20361-2-pbonzini@redhat.com
> Signed-off-by: Ingo Molnar <mingo@kernel.org>
> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com> [v4.4 backport]
> 
> Conflicts:
> 	arch/x86/kvm/svm.c

Ugh :(