[RFC,2/3] cxl_type3: Add qmp_cxl_process_mctp_message qmp interface

Commit Message

Fan Ni April 8, 2025, 4:20 a.m. UTC

From: Fan Ni <[e-mail]>

Add a new QAPI "qmp-cxl-process-mctp-message" to process the MCTP
request cached in the shared buffer from FM VM.

Signed-off-by: Fan Ni <[e-mail]>
---
 hw/mem/cxl_type3.c       | 41 ++++++++++++++++++++++++++++++++++++++++
 hw/mem/cxl_type3_stubs.c |  5 +++++
 qapi/cxl.json            | 18 ++++++++++++++++++
 3 files changed, 64 insertions(+)

Patch

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 7f85616ca1..f7ac8e8da7 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -1614,6 +1614,47 @@  void cxl_clear_poison_list_overflowed(CXLType3Dev *ct3d)
     ct3d->poison_list_overflow_ts = 0;
 }
 
+void qmp_cxl_process_mctp_message(const char *cci_name, Error **errp)
+{
+    int i;
+    struct CXLCCINamePtrMap *map;
+    struct CXLMCTPCommandBuf *buf;
+    CXLCCI *cci = NULL;
+    CXLType3Dev *ct3d;
+
+    if (!cci_map_buf) {
+        error_setg(errp, "CCI name mapping buffer not setup");
+        return;
+    }
+
+    for (i = 0; i < cci_map_buf->num_mappings; i++) {
+        map = &cci_map_buf->maps[i];
+        if (!strcmp(map->cci_name, cci_name)) {
+            cci = (CXLCCI *) map->cci_pointer;
+            break;
+        }
+    }
+    if (!cci) {
+        error_setg(errp, "CCI instance is not found with name: %s", cci_name);
+        return;
+    }
+    ct3d = CXL_TYPE3(OBJECT(cci->d));
+    if (!ct3d) {
+        error_setg(errp, "No Type3 device associated with the cci");
+        return;
+    }
+    if (ct3d->mctp_shared_buffer->status != 1) {
+        error_setg(errp, "MCTP buffer status is not set to 1, skip");
+        return;
+    }
+    buf = &ct3d->mctp_shared_buffer->command_buf;
+    buf->ret_val = cxl_process_cci_message(cci, buf->command_set, buf->command,
+                                           buf->len_in, buf->payload,
+                                           &buf->len_out, buf->payload_out,
+                                           &buf->bg_started);
+    ct3d->mctp_shared_buffer->status = 0;
+}
+
 void qmp_cxl_inject_poison(const char *path, uint64_t start, uint64_t length,
                            Error **errp)
 {
diff --git a/hw/mem/cxl_type3_stubs.c b/hw/mem/cxl_type3_stubs.c
index c1a5e4a7c1..dbf18f2af2 100644
--- a/hw/mem/cxl_type3_stubs.c
+++ b/hw/mem/cxl_type3_stubs.c
@@ -92,3 +92,8 @@  void qmp_cxl_release_dynamic_capacity(const char *path, uint16_t host_id,
 {
     error_setg(errp, "CXL Type 3 support is not compiled in");
 }
+
+void qmp_cxl_process_mctp_message(const char *cci_name, Error **errp)
+{
+    error_setg(errp, "CXL Type 3 support is not compiled in");
+}
diff --git a/qapi/cxl.json b/qapi/cxl.json
index dd947d3bbc..fcb1e0b3fd 100644
--- a/qapi/cxl.json
+++ b/qapi/cxl.json
@@ -553,3 +553,21 @@ 
            },
   'features': [ 'unstable' ]
 }
+
+##
+# @cxl-process-mctp-message:
+#
+# Command to process a MCTP command sent from another VM.
+#
+# @cci-name: name of the CCI to process the command;
+#
+# Features:
+#
+# @unstable: For now this command is subject to change.
+#
+# Since: 9.1
+##
+{'command': 'cxl-process-mctp-message',
+ 'data': {'cci-name': 'str'},
+  'features': [ 'unstable' ]
+ }