From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <stable-owner@vger.kernel.org>
Received: from mail.linuxfoundation.org ([140.211.169.12]:57672 "EHLO
        mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1752389AbdKFJpA (ORCPT
        <rfc822;stable@vger.kernel.org>); Mon, 6 Nov 2017 04:45:00 -0500
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Julien Thierry <julien.thierry@arm.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Christoffer Dall <christoffer.dall@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Russell King <linux@armlinux.org.uk>
Subject: [PATCH 4.9 09/67] arm/arm64: kvm: Disable branch profiling in HYP code
Date: Mon,  6 Nov 2017 10:43:32 +0100
Message-Id: <20171106091305.770768959@linuxfoundation.org>
In-Reply-To: <20171106091305.401025609@linuxfoundation.org>
References: <20171106091305.401025609@linuxfoundation.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Sender: stable-owner@vger.kernel.org
List-ID: <stable.vger.kernel.org>

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julien Thierry <julien.thierry@arm.com>

commit f9b269f3098121b5d54aaf822e0898c8ed1d3fec upstream.

When HYP code runs into branch profiling code, it attempts to jump to
unmapped memory, causing a HYP Panic.

Disable the branch profiling for code designed to run at HYP mode.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/kvm/hyp/Makefile   |    2 +-
 arch/arm64/kvm/hyp/Makefile |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/arch/arm/kvm/hyp/Makefile
+++ b/arch/arm/kvm/hyp/Makefile
@@ -2,7 +2,7 @@
 # Makefile for Kernel-based Virtual Machine module, HYP part
 #
 
-ccflags-y += -fno-stack-protector
+ccflags-y += -fno-stack-protector -DDISABLE_BRANCH_PROFILING
 
 KVM=../../../../virt/kvm
 
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -2,7 +2,7 @@
 # Makefile for Kernel-based Virtual Machine module, HYP part
 #
 
-ccflags-y += -fno-stack-protector
+ccflags-y += -fno-stack-protector -DDISABLE_BRANCH_PROFILING
 
 KVM=../../../../virt/kvm