@@ -6,6 +6,7 @@
#include "kvm_util.h"
+#define TDG_VP_VMCALL_GET_TD_VM_CALL_INFO 0x10000
#define TDG_VP_VMCALL_REPORT_FATAL_ERROR 0x10003
#define TDG_VP_VMCALL_INSTRUCTION_IO 30
@@ -13,4 +14,6 @@
uint64_t tdg_vp_vmcall_instruction_io(uint64_t port, uint64_t size,
uint64_t write, uint64_t *data);
void tdg_vp_vmcall_report_fatal_error(uint64_t error_code, uint64_t data_gpa);
+uint64_t tdg_vp_vmcall_get_td_vmcall_info(uint64_t *r11, uint64_t *r12,
+ uint64_t *r13, uint64_t *r14);
#endif // SELFTEST_TDX_TDX_H
@@ -4,6 +4,7 @@
#include <stdbool.h>
+#include "kvm_util.h"
#include "tdcall.h"
#define TDX_TEST_SUCCESS_PORT 0x30
@@ -92,4 +93,30 @@ uint64_t tdx_test_report_to_user_space(uint32_t data);
*/
uint32_t tdx_test_read_report_from_guest(struct kvm_vcpu *vcpu);
+/*
+ * Report a 64 bit value from the guest to user space using TDG.VP.VMCALL
+ * <Instruction.IO> call.
+ *
+ * Data is sent to host in 2 calls. LSB is sent (and needs to be read) first.
+ */
+uint64_t tdx_test_send_64bit(uint64_t port, uint64_t data);
+
+/*
+ * Report a 64 bit value from the guest to user space using TDG.VP.VMCALL
+ * <Instruction.IO> call. Data is reported on port TDX_TEST_REPORT_PORT.
+ */
+uint64_t tdx_test_report_64bit_to_user_space(uint64_t data);
+
+/*
+ * Read a 64 bit value from the guest in user space, sent using
+ * tdx_test_send_64bit().
+ */
+uint64_t tdx_test_read_64bit(struct kvm_vcpu *vcpu, uint64_t port);
+
+/*
+ * Read a 64 bit value from the guest in user space, sent using
+ * tdx_test_report_64bit_to_user_space().
+ */
+uint64_t tdx_test_read_64bit_report_from_guest(struct kvm_vcpu *vcpu);
+
#endif // SELFTEST_TDX_TEST_UTIL_H
@@ -43,3 +43,26 @@ void tdg_vp_vmcall_report_fatal_error(uint64_t error_code, uint64_t data_gpa)
__tdx_hypercall(&args, 0);
}
+
+uint64_t tdg_vp_vmcall_get_td_vmcall_info(uint64_t *r11, uint64_t *r12,
+ uint64_t *r13, uint64_t *r14)
+{
+ struct tdx_hypercall_args args = {
+ .r11 = TDG_VP_VMCALL_GET_TD_VM_CALL_INFO,
+ .r12 = 0,
+ };
+ uint64_t ret;
+
+ ret = __tdx_hypercall(&args, TDX_HCALL_HAS_OUTPUT);
+
+ if (r11)
+ *r11 = args.r11;
+ if (r12)
+ *r12 = args.r12;
+ if (r13)
+ *r13 = args.r13;
+ if (r14)
+ *r14 = args.r14;
+
+ return ret;
+}
@@ -7,6 +7,7 @@
#include <unistd.h>
#include "kvm_util.h"
+#include "tdx/tdcall.h"
#include "tdx/tdx.h"
#include "tdx/tdx_util.h"
#include "tdx/test_util.h"
@@ -124,3 +125,44 @@ uint32_t tdx_test_read_report_from_guest(struct kvm_vcpu *vcpu)
return res;
}
+
+uint64_t tdx_test_send_64bit(uint64_t port, uint64_t data)
+{
+ uint64_t data_hi = (data >> 32) & 0xFFFFFFFF;
+ uint64_t data_lo = data & 0xFFFFFFFF;
+ uint64_t err;
+
+ err = tdg_vp_vmcall_instruction_io(port, 4, PORT_WRITE, &data_lo);
+ if (err)
+ return err;
+
+ return tdg_vp_vmcall_instruction_io(port, 4, PORT_WRITE, &data_hi);
+}
+
+uint64_t tdx_test_report_64bit_to_user_space(uint64_t data)
+{
+ return tdx_test_send_64bit(TDX_TEST_REPORT_PORT, data);
+}
+
+uint64_t tdx_test_read_64bit(struct kvm_vcpu *vcpu, uint64_t port)
+{
+ uint32_t lo, hi;
+ uint64_t res;
+
+ tdx_test_assert_io(vcpu, port, 4, PORT_WRITE);
+ lo = *(uint32_t *)((void *)vcpu->run + vcpu->run->io.data_offset);
+
+ vcpu_run(vcpu);
+
+ tdx_test_assert_io(vcpu, port, 4, PORT_WRITE);
+ hi = *(uint32_t *)((void *)vcpu->run + vcpu->run->io.data_offset);
+
+ res = hi;
+ res = (res << 32) | lo;
+ return res;
+}
+
+uint64_t tdx_test_read_64bit_report_from_guest(struct kvm_vcpu *vcpu)
+{
+ return tdx_test_read_64bit(vcpu, TDX_TEST_REPORT_PORT);
+}
@@ -240,6 +240,74 @@ void verify_td_cpuid(void)
printf("\t ... PASSED\n");
}
+/*
+ * Verifies TDG.VP.VMCALL<GetTdVmCallInfo> hypercall functionality.
+ */
+void guest_code_get_td_vmcall_info(void)
+{
+ uint64_t r11, r12, r13, r14;
+ uint64_t err;
+
+ err = tdg_vp_vmcall_get_td_vmcall_info(&r11, &r12, &r13, &r14);
+ tdx_assert_error(err);
+
+ err = tdx_test_report_64bit_to_user_space(r11);
+ tdx_assert_error(err);
+
+ err = tdx_test_report_64bit_to_user_space(r12);
+ tdx_assert_error(err);
+
+ err = tdx_test_report_64bit_to_user_space(r13);
+ tdx_assert_error(err);
+
+ err = tdx_test_report_64bit_to_user_space(r14);
+ tdx_assert_error(err);
+
+ tdx_test_success();
+}
+
+void verify_get_td_vmcall_info(void)
+{
+ uint64_t r11, r12, r13, r14;
+ 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_code_get_td_vmcall_info);
+ td_finalize(vm);
+
+ printf("Verifying TD get vmcall info:\n");
+
+ /* Wait for guest to report r11 value */
+ tdx_run(vcpu);
+ r11 = tdx_test_read_64bit_report_from_guest(vcpu);
+
+ /* Wait for guest to report r12 value */
+ tdx_run(vcpu);
+ r12 = tdx_test_read_64bit_report_from_guest(vcpu);
+
+ /* Wait for guest to report r13 value */
+ tdx_run(vcpu);
+ r13 = tdx_test_read_64bit_report_from_guest(vcpu);
+
+ /* Wait for guest to report r14 value */
+ tdx_run(vcpu);
+ r14 = tdx_test_read_64bit_report_from_guest(vcpu);
+
+ TEST_ASSERT_EQ(r11, 0);
+ TEST_ASSERT_EQ(r12, 0);
+ TEST_ASSERT_EQ(r13, 0);
+ TEST_ASSERT_EQ(r14, 0);
+
+ /* Wait for guest to complete execution */
+ 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();
@@ -247,7 +315,7 @@ 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(4);
+ ksft_set_plan(5);
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),
@@ -256,6 +324,8 @@ int main(int argc, char **argv)
"verify_td_ioexit\n");
ksft_test_result(!run_in_new_process(&verify_td_cpuid),
"verify_td_cpuid\n");
+ ksft_test_result(!run_in_new_process(&verify_get_td_vmcall_info),
+ "verify_get_td_vmcall_info\n");
ksft_finished();
return 0;
The test calls TDG.VP.VMCALL<GetTdVmCallInfo> hypercall from the guest and verifies the expected returned values. TDG.VP.VMCALL<GetTdVmCallInfo> hypercall is a subleaf of TDG.VP.VMCALL to enumerate which TDG.VP.VMCALL sub leaves are supported. This hypercall is for future enhancement of the Guest-Host-Communication Interface (GHCI) specification. The GHCI version of 344426-001US defines it to require input R12 to be zero and to return zero in output registers, R11, R12, R13, and R14 so that guest TD enumerates no enhancement. Signed-off-by: Sagi Shahar <sagis@google.com> --- .../selftests/kvm/include/x86/tdx/tdx.h | 3 + .../selftests/kvm/include/x86/tdx/test_util.h | 27 +++++++ tools/testing/selftests/kvm/lib/x86/tdx/tdx.c | 23 ++++++ .../selftests/kvm/lib/x86/tdx/test_util.c | 42 +++++++++++ tools/testing/selftests/kvm/x86/tdx_vm_test.c | 72 ++++++++++++++++++- 5 files changed, 166 insertions(+), 1 deletion(-)