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authorPunit Agrawal <punit.agrawal@arm.com>2018-10-01 16:54:35 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-05-16 19:42:26 +0200
commit363b93186ff4a4450d1e913281d2a8c5e7259f30 (patch)
treeadb079ff87e67b04c7bb951646b6ac3988691d09 /virt
parent16be27a5ccfc654a7bd68eb362205362aabbd38b (diff)
KVM: arm/arm64: Ensure only THP is candidate for adjustment
[ Upstream commit fd2ef358282c849c193aa36dadbf4f07f7dcd29b ] PageTransCompoundMap() returns true for hugetlbfs and THP hugepages. This behaviour incorrectly leads to stage 2 faults for unsupported hugepage sizes (e.g., 64K hugepage with 4K pages) to be treated as THP faults. Tighten the check to filter out hugetlbfs pages. This also leads to consistently mapping all unsupported hugepage sizes as PTE level entries at stage 2. Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Reviewed-by: Suzuki Poulose <suzuki.poulose@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org # v4.13+ Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/mmu.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 225dc671ae31..1f4cac53b923 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1068,8 +1068,14 @@ static bool transparent_hugepage_adjust(kvm_pfn_t *pfnp, phys_addr_t *ipap)
{
kvm_pfn_t pfn = *pfnp;
gfn_t gfn = *ipap >> PAGE_SHIFT;
+ struct page *page = pfn_to_page(pfn);
- if (PageTransCompoundMap(pfn_to_page(pfn))) {
+ /*
+ * PageTransCompoungMap() returns true for THP and
+ * hugetlbfs. Make sure the adjustment is done only for THP
+ * pages.
+ */
+ if (!PageHuge(page) && PageTransCompoundMap(page)) {
unsigned long mask;
/*
* The address we faulted on is backed by a transparent huge