Since we only support PMD-sized mappings for THP, getting
a permission fault on a level that results in a mapping
being larger than PAGE_SIZE is a sure indication that we have
already upgraded our mapping to a PMD.
In this case, there is no need to try and parse userspace page
tables, as the fault information already tells us everything.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/kvm/mmu.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 0adc1617c557..ebb28dd4f2c9 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1076,9 +1076,14 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
* If we are not forced to use page mapping, check if we are
* backed by a THP and thus use block mapping if possible.
*/
- if (vma_pagesize == PAGE_SIZE && !(force_pte || device))
- vma_pagesize = transparent_hugepage_adjust(kvm, memslot, hva,
- &pfn, &fault_ipa);
+ if (vma_pagesize == PAGE_SIZE && !(force_pte || device)) {
+ if (fault_status == FSC_PERM && fault_granule > PAGE_SIZE)
+ vma_pagesize = fault_granule;
+ else
+ vma_pagesize = transparent_hugepage_adjust(kvm, memslot,
+ hva, &pfn,
+ &fault_ipa);
+ }
if (fault_status != FSC_PERM && !device && kvm_has_mte(kvm)) {
/* Check the VMM hasn't introduced a new VM_SHARED VMA */
--
2.30.2
