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arm/arm64: KVM: Take mmap_sem in stage2_unmap_vm
We don't hold the mmap_sem while searching for the VMAs when we try to unmap each memslot for a VM. Fix this properly to avoid unexpected results. Fixes: commit 957db10 ("arm/arm64: KVM: Introduce stage2_unmap_vm") Cc: stable@vger.kernel.org # v3.19+ Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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