From: Sagi Shahar sagis@google.com
The test verifies MMIO writes of various sizes from the guest to the host.
Signed-off-by: Sagi Shahar sagis@google.com Signed-off-by: Ackerley Tng ackerleytng@google.com --- .../selftests/kvm/include/x86_64/tdx/tdx.h | 2 + .../selftests/kvm/lib/x86_64/tdx/tdx.c | 14 +++ .../selftests/kvm/x86_64/tdx_vm_tests.c | 85 +++++++++++++++++++ 3 files changed, 101 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h b/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h index 8dd6a65485260..f2a90ad8a55c6 100644 --- a/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h +++ b/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h @@ -24,5 +24,7 @@ uint64_t tdg_vp_vmcall_instruction_wrmsr(uint64_t index, uint64_t value); uint64_t tdg_vp_vmcall_instruction_hlt(uint64_t interrupt_blocked_flag); uint64_t tdg_vp_vmcall_ve_request_mmio_read(uint64_t address, uint64_t size, uint64_t *data_out); +uint64_t tdg_vp_vmcall_ve_request_mmio_write(uint64_t address, uint64_t size, + uint64_t data_in);
#endif // SELFTEST_TDX_TDX_H diff --git a/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c index dcdacf08bcd60..8b12ac7049572 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c +++ b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c @@ -122,3 +122,17 @@ uint64_t tdg_vp_vmcall_ve_request_mmio_read(uint64_t address, uint64_t size,
return ret; } + +uint64_t tdg_vp_vmcall_ve_request_mmio_write(uint64_t address, uint64_t size, + uint64_t data_in) +{ + struct tdx_hypercall_args args = { + .r11 = TDG_VP_VMCALL_VE_REQUEST_MMIO, + .r12 = size, + .r13 = TDG_VP_VMCALL_VE_REQUEST_MMIO_WRITE, + .r14 = address, + .r15 = data_in, + }; + + return __tdx_hypercall(&args, 0); +} diff --git a/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c index 88f0429db0176..dcc0940a74e92 100644 --- a/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c +++ b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c @@ -892,6 +892,90 @@ void verify_mmio_reads(void) printf("\t ... PASSED\n"); }
+void guest_mmio_writes(void) +{ + uint64_t ret; + + ret = tdg_vp_vmcall_ve_request_mmio_write(TDX_MMIO_TEST_ADDR, 1, 0x12); + if (ret) + tdx_test_fatal(ret); + + ret = tdg_vp_vmcall_ve_request_mmio_write(TDX_MMIO_TEST_ADDR, 2, 0x1234); + if (ret) + tdx_test_fatal(ret); + + ret = tdg_vp_vmcall_ve_request_mmio_write(TDX_MMIO_TEST_ADDR, 4, 0x12345678); + if (ret) + tdx_test_fatal(ret); + + ret = tdg_vp_vmcall_ve_request_mmio_write(TDX_MMIO_TEST_ADDR, 8, 0x1234567890ABCDEF); + if (ret) + tdx_test_fatal(ret); + + // Write across page boundary. + ret = tdg_vp_vmcall_ve_request_mmio_write(PAGE_SIZE - 1, 8, 0); + if (ret) + tdx_test_fatal(ret); + + tdx_test_success(); +} + +/* + * Varifies guest MMIO writes. + */ +void verify_mmio_writes(void) +{ + struct kvm_vm *vm; + struct kvm_vcpu *vcpu; + + uint8_t byte_1; + uint16_t byte_2; + uint32_t byte_4; + uint64_t byte_8; + + vm = td_create(); + td_initialize(vm, VM_MEM_SRC_ANONYMOUS, 0); + vcpu = td_vcpu_add(vm, 0, guest_mmio_writes); + td_finalize(vm); + + printf("Verifying TD MMIO writes:\n"); + + vcpu_run(vcpu); + TDX_TEST_CHECK_GUEST_FAILURE(vcpu); + TDX_TEST_ASSERT_MMIO(vcpu, TDX_MMIO_TEST_ADDR, 1, TDG_VP_VMCALL_VE_REQUEST_MMIO_WRITE); + byte_1 = *(uint8_t *)(vcpu->run->mmio.data); + + vcpu_run(vcpu); + TDX_TEST_CHECK_GUEST_FAILURE(vcpu); + TDX_TEST_ASSERT_MMIO(vcpu, TDX_MMIO_TEST_ADDR, 2, TDG_VP_VMCALL_VE_REQUEST_MMIO_WRITE); + byte_2 = *(uint16_t *)(vcpu->run->mmio.data); + + vcpu_run(vcpu); + TDX_TEST_CHECK_GUEST_FAILURE(vcpu); + TDX_TEST_ASSERT_MMIO(vcpu, TDX_MMIO_TEST_ADDR, 4, TDG_VP_VMCALL_VE_REQUEST_MMIO_WRITE); + byte_4 = *(uint32_t *)(vcpu->run->mmio.data); + + vcpu_run(vcpu); + TDX_TEST_CHECK_GUEST_FAILURE(vcpu); + TDX_TEST_ASSERT_MMIO(vcpu, TDX_MMIO_TEST_ADDR, 8, TDG_VP_VMCALL_VE_REQUEST_MMIO_WRITE); + byte_8 = *(uint64_t *)(vcpu->run->mmio.data); + + ASSERT_EQ(byte_1, 0x12); + ASSERT_EQ(byte_2, 0x1234); + ASSERT_EQ(byte_4, 0x12345678); + ASSERT_EQ(byte_8, 0x1234567890ABCDEF); + + vcpu_run(vcpu); + ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_SYSTEM_EVENT); + ASSERT_EQ(vcpu->run->system_event.data[1], TDG_VP_VMCALL_INVALID_OPERAND); + + vcpu_run(vcpu); + TDX_TEST_ASSERT_SUCCESS(vcpu); + + kvm_vm_free(vm); + printf("\t ... PASSED\n"); +} + int main(int argc, char **argv) { setbuf(stdout, NULL); @@ -912,6 +996,7 @@ int main(int argc, char **argv) run_in_new_process(&verify_guest_msr_reads); run_in_new_process(&verify_guest_hlt); run_in_new_process(&verify_mmio_reads); + run_in_new_process(&verify_mmio_writes);
return 0; }