Fix the approach to get page map from gva to gpa. If gva maps a 4-KByte page, current implementation of addr_arch_gva2gpa() will obtain wrong page size and cannot derive correct offset from the guest virtual address. Meanwhile using HUGEPAGE_MASK(x) to calculate the offset within page (1G/2M/4K) mistakenly incorporates the upper part of 64-bit canonical linear address. That will work out improper guest physical address if translating guest virtual address in supervisor-mode address space. Signed-off-by: Zeng Guang <guang.zeng@xxxxxxxxx> --- tools/testing/selftests/kvm/lib/x86_64/processor.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index d8288374078e..9f4b8c47edce 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -293,6 +293,7 @@ uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr, if (vm_is_target_pte(pde, level, PG_LEVEL_2M)) return pde; + *level = PG_LEVEL_4K; return virt_get_pte(vm, pde, vaddr, PG_LEVEL_4K); } @@ -496,7 +497,7 @@ vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) * No need for a hugepage mask on the PTE, x86-64 requires the "unused" * address bits to be zero. */ - return PTE_GET_PA(*pte) | (gva & ~HUGEPAGE_MASK(level)); + return PTE_GET_PA(*pte) | (gva & (HUGEPAGE_SIZE(level) - 1)); } static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt) -- 2.21.3
