Commit 2e8e062136 for qemu.org

commit 2e8e062136988cffd6e61159e9bdd93c95183c6f
Author: Stefan Berger <stefanb@linux.vnet.ibm.com>
Date:   Fri Oct 2 10:25:07 2026 -0400

    tpm_util: Pass TPMVersion to function writing fatal error response

    Have tpm_util_write_fatal_error_response write a TPM version specific
    error response with error code TPM_FAIL for a TPM 1.2 and TPM_RC_FAILURE
    for a TPM 2. Adjust the callers.

    Reviewed-by: Arun Menon <armenon@redhat.com>
    Link: https://lore.kernel.org/qemu-devel/20261002142516.2063735-2-stefanb@linux.ibm.com
    Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

diff --git a/backends/tpm/tpm_emulator.c b/backends/tpm/tpm_emulator.c
index 95d2de2f48..16ae44c8d7 100644
--- a/backends/tpm/tpm_emulator.c
+++ b/backends/tpm/tpm_emulator.c
@@ -270,7 +270,8 @@ static void tpm_emulator_handle_request(TPMBackend *tb, TPMBackendCmd *cmd,
         tpm_emulator_unix_tx_bufs(tpm_emu, cmd->in, cmd->in_len,
                                   cmd->out, cmd->out_len,
                                   &cmd->selftest_done, errp) < 0) {
-        tpm_util_write_fatal_error_response(cmd->out, cmd->out_len);
+        tpm_util_write_fatal_error_response(cmd->out, cmd->out_len,
+                                            TPM_EMULATOR(tb)->tpm_version);
     }
 }

diff --git a/backends/tpm/tpm_passthrough.c b/backends/tpm/tpm_passthrough.c
index a9f35ab7d6..8a4f8183c7 100644
--- a/backends/tpm/tpm_passthrough.c
+++ b/backends/tpm/tpm_passthrough.c
@@ -118,7 +118,7 @@ static void tpm_passthrough_unix_tx_bufs(TPMPassthruState *tpm_pt,

 err_exit:
     if (ret < 0) {
-        tpm_util_write_fatal_error_response(out, out_len);
+        tpm_util_write_fatal_error_response(out, out_len, tpm_pt->tpm_version);
     }

     tpm_pt->tpm_executing = false;
diff --git a/backends/tpm/tpm_util.c b/backends/tpm/tpm_util.c
index 264bff22a9..7019f7fd3e 100644
--- a/backends/tpm/tpm_util.c
+++ b/backends/tpm/tpm_util.c
@@ -87,12 +87,23 @@ const PropertyInfo qdev_prop_tpm = {
 /*
  * Write an error message in the given output buffer.
  */
-void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len)
+void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len,
+                                         TPMVersion tpm_version)
 {
     if (out_len >= sizeof(struct tpm_resp_hdr)) {
-        tpm_cmd_set_tag(out, TPM_TAG_RSP_COMMAND);
+        switch (tpm_version) {
+        case TPM_VERSION_1_2:
+            tpm_cmd_set_tag(out, TPM_TAG_RSP_COMMAND);
+            tpm_cmd_set_error(out, TPM_FAIL);
+            break;
+        case TPM_VERSION_2_0:
+            tpm_cmd_set_tag(out, TPM2_ST_NO_SESSIONS);
+            tpm_cmd_set_error(out, TPM_RC_FAILURE);
+            break;
+        default:
+            g_assert_not_reached();
+        }
         tpm_cmd_set_size(out, sizeof(struct tpm_resp_hdr));
-        tpm_cmd_set_error(out, TPM_FAIL);
     }
 }

diff --git a/include/system/tpm_util.h b/include/system/tpm_util.h
index 1858693225..3ab2fe693d 100644
--- a/include/system/tpm_util.h
+++ b/include/system/tpm_util.h
@@ -25,7 +25,8 @@
 #include "system/tpm.h"
 #include "qemu/bswap.h"

-void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len);
+void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len,
+                                         TPMVersion tpm_version);

 bool tpm_util_is_selftest(const uint8_t *in, uint32_t in_len);