[Qemu-devel] [PATCH 2/3] sPAPR: Support RTAS call ibm, {open, close}-errinjct

[Gavin Shan <gwshan@linux.vnet.ibm.com>]

The patch supports RTAS calls "ibm,{open,close}-errinjct" to
manupliate the token, which is passed to RTAS call "ibm,errinjct"
to indicate the valid context for error injection. Each VM is
permitted to have only one token at once and we simply have one
random number for that.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
 hw/ppc/spapr_rtas.c    | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++
 include/hw/ppc/spapr.h |  9 ++++++-
 2 files changed, 81 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
index 0f1ae55..0afc5dd 100644
--- a/hw/ppc/spapr_rtas.c
+++ b/hw/ppc/spapr_rtas.c
@@ -245,6 +245,75 @@ static void rtas_ibm_os_term(PowerPCCPU *cpu,
     rtas_st(rets, 0, ret);
 }
 
+static void rtas_ibm_open_errinjct(PowerPCCPU *cpu,
+                                   sPAPREnvironment *spapr,
+                                   uint32_t token, uint32_t nargs,
+                                   target_ulong args, uint32_t nret,
+                                   target_ulong rets)
+{
+    int32_t ret;
+
+    /* Sanity check on number of arguments */
+    if ((nargs != 0) || (nret != 2)) {
+        ret = RTAS_OUT_PARAM_ERROR;
+        goto out;
+    }
+
+    /* Check if we already had token */
+    if (spapr->errinjct_token) {
+        ret = RTAS_OUT_TOKEN_OPENED;
+        goto out;
+    }
+
+    /* Grab random number as token */
+    spapr->errinjct_token = random();
+    if (spapr->errinjct_token == 0) {
+        ret = RTAS_OUT_BUSY;
+        goto out;
+    }
+
+    /* Success */
+    rtas_st(rets, 0, spapr->errinjct_token);
+    ret = RTAS_OUT_SUCCESS;
+out:
+    rtas_st(rets, 1, ret);
+}
+
+static void rtas_ibm_close_errinjct(PowerPCCPU *cpu,
+                                    sPAPREnvironment *spapr,
+                                    uint32_t token, uint32_t nargs,
+                                    target_ulong args, uint32_t nret,
+                                    target_ulong rets)
+{
+    uint32_t open_token;
+    int32_t ret;
+
+    /* Sanity check on number of arguments */
+    if ((nargs != 1) || (nret != 1)) {
+        ret = RTAS_OUT_PARAM_ERROR;
+        goto out;
+    }
+
+    /* Check if we had opened token */
+    if (!spapr->errinjct_token) {
+        ret = RTAS_OUT_CLOSE_ERROR;
+        goto out;
+    }
+
+    /* Check if it's the opened token */
+    open_token = rtas_ld(args, 0);
+    if (spapr->errinjct_token != open_token) {
+        ret = RTAS_OUT_CLOSE_ERROR;
+        goto out;
+    }
+
+    /* Success */
+    spapr->errinjct_token = 0;
+    ret = RTAS_OUT_SUCCESS;
+out:
+    rtas_st(rets, 0, ret);
+}
+
 static struct rtas_call {
     const char *name;
     spapr_rtas_fn fn;
@@ -370,6 +439,10 @@ static void core_rtas_register_types(void)
                         rtas_ibm_set_system_parameter);
     spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
                         rtas_ibm_os_term);
+    spapr_rtas_register(RTAS_IBM_OPEN_ERRINJCT, "ibm,open-errinjct",
+                        rtas_ibm_open_errinjct);
+    spapr_rtas_register(RTAS_IBM_CLOSE_ERRINJCT, "ibm,close-errinjct",
+                        rtas_ibm_close_errinjct);
 }
 
 type_init(core_rtas_register_types)
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index af71e8b..4f7cc2e 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -39,6 +39,9 @@ typedef struct sPAPREnvironment {
     bool htab_first_pass;
     int htab_fd;
     bool htab_fd_stale;
+
+    /* Error injection token */
+    uint32_t errinjct_token;
 } sPAPREnvironment;
 
 #define H_SUCCESS         0
@@ -379,6 +382,8 @@ int spapr_allocate_irq_block(int num, bool lsi, bool msi);
 #define RTAS_OUT_BUSY               -2
 #define RTAS_OUT_PARAM_ERROR        -3
 #define RTAS_OUT_NOT_SUPPORTED      -3
+#define RTAS_OUT_TOKEN_OPENED       -4
+#define RTAS_OUT_CLOSE_ERROR        -4
 #define RTAS_OUT_NOT_AUTHORIZED     -9002
 
 /* RTAS tokens */
@@ -422,8 +427,10 @@ int spapr_allocate_irq_block(int num, bool lsi, bool msi);
 #define RTAS_IBM_SET_SLOT_RESET                 (RTAS_TOKEN_BASE + 0x23)
 #define RTAS_IBM_CONFIGURE_PE                   (RTAS_TOKEN_BASE + 0x24)
 #define RTAS_IBM_SLOT_ERROR_DETAIL              (RTAS_TOKEN_BASE + 0x25)
+#define RTAS_IBM_OPEN_ERRINJCT                  (RTAS_TOKEN_BASE + 0x26)
+#define RTAS_IBM_CLOSE_ERRINJCT                 (RTAS_TOKEN_BASE + 0x27)
 
-#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x26)
+#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x28)
 
 /* RTAS ibm,get-system-parameter token values */
 #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS      20
-- 
1.8.3.2