From: Julien Thierry <julien.thierry@arm.com>
To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu
Cc: Julien Thierry <julien.thierry@arm.com>,
marc.zyngier@arm.com, Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Russell King <linux@armlinux.org.uk>,
stable@vger.kernel.org
Subject: [RESEND PATCH 2/2] arm/arm64: kvm: Disable branch profiling in HYP code
Date: Fri, 20 Oct 2017 12:34:17 +0100 [thread overview]
Message-ID: <1508499257-10014-3-git-send-email-julien.thierry@arm.com> (raw)
In-Reply-To: <1508499257-10014-1-git-send-email-julien.thierry@arm.com>
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>
Cc: <stable@vger.kernel.org>
---
arch/arm/kvm/hyp/Makefile | 2 +-
arch/arm64/kvm/hyp/Makefile | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/kvm/hyp/Makefile b/arch/arm/kvm/hyp/Makefile
index 8679405..92eab1d 100644
--- 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
diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile
index 14c4e3b..48b0354 100644
--- 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
--
1.9.1
next prev parent reply other threads:[~2017-10-20 11:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-20 11:34 [RESEND PATCH 0/2] arm/arm64: kvm: Disable branch profiling in HYP code Julien Thierry
2017-10-20 11:34 ` [RESEND PATCH 1/2] arm/arm64: kvm: Move initialization completion message Julien Thierry
2017-10-20 11:34 ` Julien Thierry [this message]
2017-10-21 15:04 ` [RESEND PATCH 0/2] arm/arm64: kvm: Disable branch profiling in HYP code Christoffer Dall
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