From: Yosry Ahmed On x86, KVM selftests use memslot 0 for all the default regions used by the test infrastructure. This is an implementation detail. nested_map_memslot() is currently used to map the default regions by explicitly passing slot 0, which leaks the library implementation into the caller. Rename the function to a very verbose nested_identity_map_default_memslots() to reflect what it actually does. Add an assertion that only memslot 0 is being used so that the implementation does not change from under us. No functional change intended. Signed-off-by: Yosry Ahmed Signed-off-by: Sean Christopherson --- tools/testing/selftests/kvm/include/x86/vmx.h | 4 ++-- tools/testing/selftests/kvm/lib/x86/vmx.c | 12 ++++++++---- tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c | 2 +- 3 files changed, 11 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/kvm/include/x86/vmx.h b/tools/testing/selftests/kvm/include/x86/vmx.h index 96e2b4c630a9..91916b8aa94b 100644 --- a/tools/testing/selftests/kvm/include/x86/vmx.h +++ b/tools/testing/selftests/kvm/include/x86/vmx.h @@ -563,8 +563,8 @@ void nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr); void nested_map(struct vmx_pages *vmx, struct kvm_vm *vm, uint64_t nested_paddr, uint64_t paddr, uint64_t size); -void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm, - uint32_t memslot); +void nested_identity_map_default_memslots(struct vmx_pages *vmx, + struct kvm_vm *vm); void nested_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm, uint64_t addr, uint64_t size); bool kvm_cpu_has_ept(void); diff --git a/tools/testing/selftests/kvm/lib/x86/vmx.c b/tools/testing/selftests/kvm/lib/x86/vmx.c index 29b082a58daa..eec33ec63811 100644 --- a/tools/testing/selftests/kvm/lib/x86/vmx.c +++ b/tools/testing/selftests/kvm/lib/x86/vmx.c @@ -494,12 +494,16 @@ void nested_map(struct vmx_pages *vmx, struct kvm_vm *vm, /* Prepare an identity extended page table that maps all the * physical pages in VM. */ -void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm, - uint32_t memslot) +void nested_identity_map_default_memslots(struct vmx_pages *vmx, + struct kvm_vm *vm) { + uint32_t s, memslot = 0; sparsebit_idx_t i, last; - struct userspace_mem_region *region = - memslot2region(vm, memslot); + struct userspace_mem_region *region = memslot2region(vm, memslot); + + /* Only memslot 0 is mapped here, ensure it's the only one being used */ + for (s = 0; s < NR_MEM_REGIONS; s++) + TEST_ASSERT_EQ(vm->memslots[s], 0); i = (region->region.guest_phys_addr >> vm->page_shift) - 1; last = i + (region->region.memory_size >> vm->page_shift); diff --git a/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c b/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c index 98cb6bdab3e6..aab7333aaef0 100644 --- a/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c +++ b/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c @@ -121,7 +121,7 @@ static void test_vmx_dirty_log(bool enable_ept) */ if (enable_ept) { prepare_eptp(vmx, vm); - nested_map_memslot(vmx, vm, 0); + nested_identity_map_default_memslots(vmx, vm); nested_map(vmx, vm, NESTED_TEST_MEM1, GUEST_TEST_MEM, PAGE_SIZE); nested_map(vmx, vm, NESTED_TEST_MEM2, GUEST_TEST_MEM, PAGE_SIZE); } -- 2.52.0.351.gbe84eed79e-goog