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    Subject[PATCH 4.11 168/197] kvm: arm/arm64: Force reading uncached stage2 PGD
    Date
    4.11-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Suzuki K Poulose <suzuki.poulose@arm.com>

    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@arm.com>
    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    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
    @@ -844,7 +844,7 @@ 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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