ppc: spapr-rtas - implement os-term rtas call

PAPR compliant guest calls this in absence of kdump. This finally reaches the guest and can be handled according to the policies set by higher level tools(like taking dump) for further analysis by tools like crash. Linux kernel calls ibm,os-term when extended property of os-term is set. This makes sure that a return to the linux kernel is gauranteed. Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> [agraf: reduce RTAS_TOKEN_MAX] Signed-off-by: Alexander Graf <agraf@suse.de>
qemu · Sep 8, 2014 · 2e14072 · 2e14072
1 parent 277c7a4
commit 2e14072
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Showing 3 changed files with 25 additions and 2 deletions.
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
@@ -502,6 +502,15 @@ static void *spapr_create_fdt_skel(hwaddr initrd_base,
 
     _FDT((fdt_property_cell(fdt, "rtas-error-log-max", RTAS_ERROR_LOG_MAX)));
 
+    /*
+     * According to PAPR, rtas ibm,os-term, does not gaurantee a return
+     * back to the guest cpu.
+     *
+     * While an additional ibm,extended-os-term property indicates that
+     * rtas call return will always occur. Set this property.
+     */
+    _FDT((fdt_property(fdt, "ibm,extended-os-term", NULL, 0)));
+
     _FDT((fdt_end_node(fdt)));
 
     /* interrupt controller */

diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
@@ -277,6 +277,19 @@ static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
     rtas_st(rets, 0, ret);
 }
 
+static void rtas_ibm_os_term(PowerPCCPU *cpu,
+                            sPAPREnvironment *spapr,
+                            uint32_t token, uint32_t nargs,
+                            target_ulong args,
+                            uint32_t nret, target_ulong rets)
+{
+    target_ulong ret = 0;
+
+    qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE, &error_abort);
+
+    rtas_st(rets, 0, ret);
+}
+
 static struct rtas_call {
     const char *name;
     spapr_rtas_fn fn;
@@ -404,6 +417,8 @@ static void core_rtas_register_types(void)
     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
                         "ibm,set-system-parameter",
                         rtas_ibm_set_system_parameter);
+    spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
+                        rtas_ibm_os_term);
 }
 
 type_init(core_rtas_register_types)
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
@@ -382,9 +382,8 @@ int spapr_allocate_irq_block(int num, bool lsi, bool msi);
 #define RTAS_GET_SENSOR_STATE                   (RTAS_TOKEN_BASE + 0x1D)
 #define RTAS_IBM_CONFIGURE_CONNECTOR            (RTAS_TOKEN_BASE + 0x1E)
 #define RTAS_IBM_OS_TERM                        (RTAS_TOKEN_BASE + 0x1F)
-#define RTAS_IBM_EXTENDED_OS_TERM               (RTAS_TOKEN_BASE + 0x20)
 
-#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x21)
+#define RTAS_TOKEN_MAX                          (RTAS_TOKEN_BASE + 0x20)
 
 /* RTAS ibm,get-system-parameter token values */
 #define RTAS_SYSPARM_SPLPAR_CHARACTERISTICS      20