On 8/8/2025 4:16 AM, Sagi Shahar wrote: [...]
diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c b/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c index 8c3b6802c37e..f92ddda2d1ac 100644 --- a/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c +++ b/tools/testing/selftests/kvm/lib/x86/tdx/test_util.c @@ -31,6 +31,25 @@ void tdx_test_assert_io(struct kvm_vcpu *vcpu, uint16_t port, uint8_t size, vcpu->run->io.direction); }+void tdx_test_assert_mmio(struct kvm_vcpu *vcpu, uint64_t phys_addr,+ uint32_t size, uint8_t is_write) +{ + TEST_ASSERT(vcpu->run->exit_reason == KVM_EXIT_MMIO, + "Got exit_reason other than KVM_EXIT_MMIO: %u (%s)\n", + vcpu->run->exit_reason, + exit_reason_str(vcpu->run->exit_reason)); + + TEST_ASSERT(vcpu->run->exit_reason == KVM_EXIT_MMIO &&
It's already checked above.
+ vcpu->run->mmio.phys_addr == phys_addr && + vcpu->run->mmio.len == size && + vcpu->run->mmio.is_write == is_write, + "Got an unexpected MMIO exit values: %u (%s) %llu %u %u\n", + vcpu->run->exit_reason, + exit_reason_str(vcpu->run->exit_reason), + vcpu->run->mmio.phys_addr, vcpu->run->mmio.len, + vcpu->run->mmio.is_write); +} + void tdx_run(struct kvm_vcpu *vcpu) { td_vcpu_run(vcpu); diff --git a/tools/testing/selftests/kvm/x86/tdx_vm_test.c b/tools/testing/selftests/kvm/x86/tdx_vm_test.c index 720ef5e87071..563f1025c8a3 100644 --- a/tools/testing/selftests/kvm/x86/tdx_vm_test.c +++ b/tools/testing/selftests/kvm/x86/tdx_vm_test.c @@ -719,6 +719,91 @@ void verify_guest_hlt(void) _verify_guest_hlt(0); }+/* Pick any address that was not mapped into the guest to test MMIO */+#define TDX_MMIO_TEST_ADDR 0x200000000 +#define MMIO_SYNC_VALUE 0x42 + +void guest_mmio_reads(void) +{ + uint64_t mmio_test_addr = TDX_MMIO_TEST_ADDR | tdx_s_bit; + uint64_t data; + uint64_t ret; + + ret = tdg_vp_vmcall_ve_request_mmio_read(mmio_test_addr, 1, &data); + tdx_assert_error(ret); + if (data != 0x12) + tdx_test_fatal(1); + + ret = tdg_vp_vmcall_ve_request_mmio_read(mmio_test_addr, 2, &data); + tdx_assert_error(ret); + if (data != 0x1234) + tdx_test_fatal(2); + + ret = tdg_vp_vmcall_ve_request_mmio_read(mmio_test_addr, 4, &data); + tdx_assert_error(ret); + if (data != 0x12345678) + tdx_test_fatal(4); + + ret = tdg_vp_vmcall_ve_request_mmio_read(mmio_test_addr, 8, &data); + tdx_assert_error(ret); + if (data != 0x1234567890ABCDEF) + tdx_test_fatal(8); + + /* Make sure host and guest are synced to the same point of execution */ + tdx_test_report_to_user_space(MMIO_SYNC_VALUE);
Is this step necessary?
+ + /* Read an invalid number of bytes. */ + ret = tdg_vp_vmcall_ve_request_mmio_read(mmio_test_addr, 10, &data); + tdx_assert_error(ret); + + tdx_test_success(); +} + +/* + * Verifies guest MMIO reads. + */ +void verify_mmio_reads(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + + vm = td_create(); + td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0); + vcpu = td_vcpu_add(vm, 0, guest_mmio_reads); + td_finalize(vm); + + printf("Verifying TD MMIO reads:\n"); + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 1, MMIO_READ); + *(uint8_t *)vcpu->run->mmio.data = 0x12; + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 2, MMIO_READ); + *(uint16_t *)vcpu->run->mmio.data = 0x1234; + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 4, MMIO_READ); + *(uint32_t *)vcpu->run->mmio.data = 0x12345678; + + tdx_run(vcpu); + tdx_test_assert_mmio(vcpu, TDX_MMIO_TEST_ADDR, 8, MMIO_READ); + *(uint64_t *)vcpu->run->mmio.data = 0x1234567890ABCDEF; + + tdx_run(vcpu); + TEST_ASSERT_EQ(tdx_test_read_report_from_guest(vcpu), MMIO_SYNC_VALUE); + + td_vcpu_run(vcpu); + TEST_ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_SYSTEM_EVENT); + TEST_ASSERT_EQ(vcpu->run->system_event.data[12], TDG_VP_VMCALL_INVALID_OPERAND); + + tdx_run(vcpu); + tdx_test_assert_success(vcpu); + + kvm_vm_free(vm); + printf("\t ... PASSED\n"); +} + int main(int argc, char **argv) { ksft_print_header(); @@ -726,7 +811,7 @@ int main(int argc, char **argv) if (!is_tdx_enabled()) ksft_exit_skip("TDX is not supported by the KVM. Exiting.\n");- ksft_set_plan(10);+ ksft_set_plan(11); ksft_test_result(!run_in_new_process(&verify_td_lifecycle), "verify_td_lifecycle\n"); ksft_test_result(!run_in_new_process(&verify_report_fatal_error), @@ -747,6 +832,8 @@ int main(int argc, char **argv) "verify_guest_msr_reads\n"); ksft_test_result(!run_in_new_process(&verify_guest_hlt), "verify_guest_hlt\n"); + ksft_test_result(!run_in_new_process(&verify_mmio_reads), + "verify_mmio_reads\n");ksft_finished();return 0;
