[PATCH 18/19] hw/cxl: Add dummy security state get

[Jonathan Cameron <Jonathan.Cameron@huawei.com>]

Needed to allow the santize comamnds to be tested with proposed Linux Kernel
support.  Default value + no control of the security state will work for now.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 hw/cxl/cxl-mailbox-utils.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 644dd97727..f40f12f0de 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -73,6 +73,8 @@ enum {
     SANITIZE    = 0x44,
         #define OVERWRITE     0x0
         #define SECURE_ERASE  0x1
+    PERSISTENT_MEM = 0x45,
+        #define GET_SECURITY_STATE     0x0
     MEDIA_AND_POISON = 0x43,
         #define GET_POISON_LIST        0x0
         #define INJECT_POISON          0x1
@@ -869,6 +871,19 @@ static CXLRetCode cmd_sanitize_overwrite(const struct cxl_cmd *cmd,
     }
 }
 
+static CXLRetCode cmd_get_security_state(const struct cxl_cmd *cmd,
+                                         uint8_t *payload_in,
+                                         size_t len_in,
+                                         uint8_t *payload_out,
+                                         size_t *len_out,
+                                         CXLCCI *cci)
+{
+    uint32_t *state = (uint32_t *)payload_out;
+
+    *state = 0;
+    *len_out = 4;
+    return CXL_MBOX_SUCCESS;
+}
 /*
  * This is very inefficient, but good enough for now!
  * Also the payload will always fit, so no need to handle the MORE flag and
@@ -1115,6 +1130,8 @@ static const struct cxl_cmd cxl_cmd_set[256][256] = {
         ~0, IMMEDIATE_CONFIG_CHANGE | IMMEDIATE_DATA_CHANGE },
     [SANITIZE][OVERWRITE] = { "SANITIZE_OVERWRITE", cmd_sanitize_overwrite, 0,
         IMMEDIATE_DATA_CHANGE | SECURITY_STATE_CHANGE | BACKGROUND_OPERATION },
+    [PERSISTENT_MEM][GET_SECURITY_STATE] = { "GET_SECURITY_STATE",
+        cmd_get_security_state, 0, 0 },
     [MEDIA_AND_POISON][GET_POISON_LIST] = { "MEDIA_AND_POISON_GET_POISON_LIST",
         cmd_media_get_poison_list, 16, 0 },
     [MEDIA_AND_POISON][INJECT_POISON] = { "MEDIA_AND_POISON_INJECT_POISON",
-- 
2.39.2