On Tue, Dec 12, 2023 at 12:46:33PM -0800, Sagi Shahar wrote:
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 Signed-off-by: Ryan Afranji afranji@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 13ce60df5684..502b670ea699 100644 --- a/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h +++ b/tools/testing/selftests/kvm/include/x86_64/tdx/tdx.h @@ -25,5 +25,7 @@ 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 b19f07ebc0e7..f4afa09f7e3d 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c +++ b/tools/testing/selftests/kvm/lib/x86_64/tdx/tdx.c @@ -143,3 +143,17 @@ 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 48902b69d13e..5e28ba828a92 100644 --- a/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c +++ b/tools/testing/selftests/kvm/x86_64/tdx_vm_tests.c @@ -885,6 +885,90 @@ 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");
- td_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);
- td_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);
- td_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);
- td_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);
- TEST_ASSERT_EQ(byte_1, 0x12);
- TEST_ASSERT_EQ(byte_2, 0x1234);
- TEST_ASSERT_EQ(byte_4, 0x12345678);
- TEST_ASSERT_EQ(byte_8, 0x1234567890ABCDEF);
- td_vcpu_run(vcpu);
- TEST_ASSERT_EQ(vcpu->run->exit_reason, KVM_EXIT_SYSTEM_EVENT);
- TEST_ASSERT_EQ(vcpu->run->system_event.data[1], TDG_VP_VMCALL_INVALID_OPERAND);
Is it possible that this event is caused by an failure of the last 8 byte write? i.e. though MMIO exit to host with correct value 0x1234567890ABCDEF, but guest sees ret as TDG_VP_VMCALL_INVALID_OPERAND.
And if, coincidently, guest gets a ret=0 in the next across page boundary write, the selftest will show "PASSED", which is not right.
- td_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); @@ -905,6 +989,7 @@ 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; } -- 2.43.0.472.g3155946c3a-goog