From: Jack Thomson jackabt@amazon.com
Enable the pre_fault_memory_test to run on arm64 by making it work with different guest page sizes and testing multiple guest configurations.
Update the test_assert to compare against the UCALL_EXIT_REASON, for portability, as arm64 exits with KVM_EXIT_MMIO while x86 uses KVM_EXIT_IO.
Signed-off-by: Jack Thomson jackabt@amazon.com --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/pre_fault_memory_test.c | 85 ++++++++++++++----- 2 files changed, 63 insertions(+), 23 deletions(-)
diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index ba5c2b643efa..6d6a74ddad30 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -187,6 +187,7 @@ TEST_GEN_PROGS_arm64 += memslot_perf_test TEST_GEN_PROGS_arm64 += mmu_stress_test TEST_GEN_PROGS_arm64 += rseq_test TEST_GEN_PROGS_arm64 += steal_time +TEST_GEN_PROGS_arm64 += pre_fault_memory_test
TEST_GEN_PROGS_s390 = $(TEST_GEN_PROGS_COMMON) TEST_GEN_PROGS_s390 += s390/memop diff --git a/tools/testing/selftests/kvm/pre_fault_memory_test.c b/tools/testing/selftests/kvm/pre_fault_memory_test.c index 93e603d91311..be1a84a6c137 100644 --- a/tools/testing/selftests/kvm/pre_fault_memory_test.c +++ b/tools/testing/selftests/kvm/pre_fault_memory_test.c @@ -11,19 +11,29 @@ #include <kvm_util.h> #include <processor.h> #include <pthread.h> +#include <guest_modes.h>
/* Arbitrarily chosen values */ -#define TEST_SIZE (SZ_2M + PAGE_SIZE) -#define TEST_NPAGES (TEST_SIZE / PAGE_SIZE) +#define TEST_BASE_SIZE SZ_2M #define TEST_SLOT 10
-static void guest_code(uint64_t base_gva) +/* Storage of test info to share with guest code */ +struct test_config { + uint64_t page_size; + uint64_t test_size; + uint64_t test_num_pages; +}; + +static struct test_config test_config; + +static void guest_code(uint64_t base_gpa) { volatile uint64_t val __used; + struct test_config *config = &test_config; int i;
- for (i = 0; i < TEST_NPAGES; i++) { - uint64_t *src = (uint64_t *)(base_gva + i * PAGE_SIZE); + for (i = 0; i < config->test_num_pages; i++) { + uint64_t *src = (uint64_t *)(base_gpa + i * config->page_size);
val = *src; } @@ -56,7 +66,7 @@ static void *delete_slot_worker(void *__data) cpu_relax();
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, data->gpa, - TEST_SLOT, TEST_NPAGES, data->flags); + TEST_SLOT, test_config.test_num_pages, data->flags);
return NULL; } @@ -159,22 +169,35 @@ static void pre_fault_memory(struct kvm_vcpu *vcpu, u64 base_gpa, u64 offset, KVM_PRE_FAULT_MEMORY, ret, vcpu->vm); }
-static void __test_pre_fault_memory(unsigned long vm_type, bool private) +struct test_params { + unsigned long vm_type; + bool private; +}; + +static void __test_pre_fault_memory(enum vm_guest_mode guest_mode, void *arg) { uint64_t gpa, gva, alignment, guest_page_size; + struct test_params *p = arg; const struct vm_shape shape = { - .mode = VM_MODE_DEFAULT, - .type = vm_type, + .mode = guest_mode, + .type = p->vm_type, }; struct kvm_vcpu *vcpu; struct kvm_run *run; struct kvm_vm *vm; struct ucall uc;
+ pr_info("Testing guest mode: %s\n", vm_guest_mode_string(guest_mode)); + vm = vm_create_shape_with_one_vcpu(shape, &vcpu, guest_code);
- alignment = guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; - gpa = (vm->max_gfn - TEST_NPAGES) * guest_page_size; + guest_page_size = vm_guest_mode_params[guest_mode].page_size; + + test_config.page_size = guest_page_size; + test_config.test_size = TEST_BASE_SIZE + test_config.page_size; + test_config.test_num_pages = vm_calc_num_guest_pages(vm->mode, test_config.test_size); + + gpa = (vm->max_gfn - test_config.test_num_pages) * test_config.page_size; #ifdef __s390x__ alignment = max(0x100000UL, guest_page_size); #else @@ -183,23 +206,32 @@ static void __test_pre_fault_memory(unsigned long vm_type, bool private) gpa = align_down(gpa, alignment); gva = gpa & ((1ULL << (vm->va_bits - 1)) - 1);
- vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, gpa, TEST_SLOT, - TEST_NPAGES, private ? KVM_MEM_GUEST_MEMFD : 0); - virt_map(vm, gva, gpa, TEST_NPAGES); + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, + gpa, TEST_SLOT, test_config.test_num_pages, + p->private ? KVM_MEM_GUEST_MEMFD : 0); + virt_map(vm, gva, gpa, test_config.test_num_pages); + + if (p->private) + vm_mem_set_private(vm, gpa, test_config.test_size); + pre_fault_memory(vcpu, gpa, 0, TEST_BASE_SIZE, 0, p->private); + /* Test pre-faulting over an already faulted range */ + pre_fault_memory(vcpu, gpa, 0, TEST_BASE_SIZE, 0, p->private); + pre_fault_memory(vcpu, gpa, TEST_BASE_SIZE, + test_config.page_size * 2, test_config.page_size, p->private); + pre_fault_memory(vcpu, gpa, test_config.test_size, + test_config.page_size, test_config.page_size, p->private);
- if (private) - vm_mem_set_private(vm, gpa, TEST_SIZE); + vcpu_args_set(vcpu, 1, gva);
- pre_fault_memory(vcpu, gpa, 0, SZ_2M, 0, private); - pre_fault_memory(vcpu, gpa, SZ_2M, PAGE_SIZE * 2, PAGE_SIZE, private); - pre_fault_memory(vcpu, gpa, TEST_SIZE, PAGE_SIZE, PAGE_SIZE, private); + /* Export the shared variables to the guest. */ + sync_global_to_guest(vm, test_config);
- vcpu_args_set(vcpu, 1, gva); vcpu_run(vcpu);
run = vcpu->run; - TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, - "Wanted KVM_EXIT_IO, got exit reason: %u (%s)", + TEST_ASSERT(run->exit_reason == UCALL_EXIT_REASON, + "Wanted %s, got exit reason: %u (%s)", + exit_reason_str(UCALL_EXIT_REASON), run->exit_reason, exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) { @@ -218,18 +250,25 @@ static void __test_pre_fault_memory(unsigned long vm_type, bool private)
static void test_pre_fault_memory(unsigned long vm_type, bool private) { + struct test_params p = { + .vm_type = vm_type, + .private = private, + }; + if (vm_type && !(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(vm_type))) { pr_info("Skipping tests for vm_type 0x%lx\n", vm_type); return; }
- __test_pre_fault_memory(vm_type, private); + for_each_guest_mode(__test_pre_fault_memory, &p); }
int main(int argc, char *argv[]) { TEST_REQUIRE(kvm_check_cap(KVM_CAP_PRE_FAULT_MEMORY));
+ guest_modes_append_default(); + test_pre_fault_memory(0, false); #ifdef __x86_64__ test_pre_fault_memory(KVM_X86_SW_PROTECTED_VM, false);