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authorSuzuki K Poulose <suzuki.poulose@arm.com>2017-05-16 10:34:54 +0100
committerChristoffer Dall <cdall@linaro.org>2017-05-16 11:54:00 +0200
commit2952a6070e07ebdd5896f1f5b861acad677caded (patch)
tree086d1ec9783ef2b11a15588dc07a15b006c33798
parent9b619a8f08da9f61f166edbbe30ad05c359ec19e (diff)
kvm: arm/arm64: Force reading uncached stage2 PGD
Make sure we don't use a cached value of the KVM stage2 PGD while resetting the PGD. Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Christoffer Dall <cdall@linaro.org>
-rw-r--r--virt/kvm/arm/mmu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 909a1a793b31..704e35f312a4 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -837,7 +837,7 @@ void kvm_free_stage2_pgd(struct kvm *kvm)
spin_lock(&kvm->mmu_lock);
if (kvm->arch.pgd) {
unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
- pgd = kvm->arch.pgd;
+ pgd = READ_ONCE(kvm->arch.pgd);
kvm->arch.pgd = NULL;
}
spin_unlock(&kvm->mmu_lock);