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authorSuzuki K Poulose <suzuki.poulose@arm.com>2019-03-20 14:57:19 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2019-03-20 17:29:55 +0000
commit3c3736cd32bf5197aed1410ae826d2d254a5b277 (patch)
tree721732d76a77b19dc5e3bd104931caad39dd3b4d /arch/csky
parenta80868f398554842b14d07060012c06efb57c456 (diff)
KVM: arm/arm64: Fix handling of stage2 huge mappings
We rely on the mmu_notifier call backs to handle the split/merge of huge pages and thus we are guaranteed that, while creating a block mapping, either the entire block is unmapped at stage2 or it is missing permission. However, we miss a case where the block mapping is split for dirty logging case and then could later be made block mapping, if we cancel the dirty logging. This not only creates inconsistent TLB entries for the pages in the the block, but also leakes the table pages for PMD level. Handle this corner case for the huge mappings at stage2 by unmapping the non-huge mapping for the block. This could potentially release the upper level table. So we need to restart the table walk once we unmap the range. Fixes : ad361f093c1e31d ("KVM: ARM: Support hugetlbfs backed huge pages") Reported-by: Zheng Xiang <zhengxiang9@huawei.com> Cc: Zheng Xiang <zhengxiang9@huawei.com> Cc: Zenghui Yu <yuzenghui@huawei.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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