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kvm: arm/arm64: Force reading uncached stage2 PGD
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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>
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Suzuki K Poulose authored and Christoffer Dall committed May 16, 2017
1 parent 9b619a8 commit 2952a60
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion virt/kvm/arm/mmu.c
Original file line number Diff line number Diff line change
@@ -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);

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