linux-kernel - [PATCH 2/2] KVM: arm64: Stub EXPORT

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Message-Id: <20210203141931.615898-3-qperret@google.com>
Date:   Wed,  3 Feb 2021 14:19:31 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     arnd@...db.de, maz@...nel.org, catalin.marinas@....com,
        will@...nel.org
Cc:     james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, ardb@...nel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kernel-team@...roid.com, qperret@...gle.com
Subject: [PATCH 2/2] KVM: arm64: Stub EXPORT_SYMBOL for nVHE EL2 code

In order to ensure the module loader does not get confused if a symbol
is exported in EL2 nVHE code (as will be the case when we will compile
e.g. lib/memset.S into the EL2 object), make sure to stub all exports
using __DISABLE_EXPORTS in the nvhe folder.

Suggested-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Quentin Perret <qperret@...gle.com>
---
 arch/arm64/kvm/hyp/nvhe/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 1f1e351c5fe2..c9c121c8d5de 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -3,8 +3,8 @@
 # Makefile for Kernel-based Virtual Machine module, HYP/nVHE part
 #
 
-asflags-y := -D__KVM_NVHE_HYPERVISOR__
-ccflags-y := -D__KVM_NVHE_HYPERVISOR__
+asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
+ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
 
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o
-- 
2.30.0.365.g02bc693789-goog