4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Suzuki K Poulose <suzuki.poulose@xxxxxxx> commit 2952a6070e07ebdd5896f1f5b861acad677caded upstream. Make sure we don't use a cached value of the KVM stage2 PGD while resetting the PGD. Cc: Marc Zyngier <marc.zyngier@xxxxxxx> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx> Reviewed-by: Christoffer Dall <cdall@xxxxxxxxxx> Signed-off-by: Christoffer Dall <cdall@xxxxxxxxxx> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm/kvm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -833,7 +833,7 @@ 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); hwpgd = kvm_get_hwpgd(kvm); kvm->arch.pgd = NULL; }