target/ppc/spapr_caps: Add new tristate cap safe_cache

Add new tristate cap cap-cfpc to represent the cache flush on privilege
change capability.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 26 insertions, 10 deletions

diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index d6f82b18fc..d53da63b1c 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -73,11 +73,8 @@ static void spapr_cap_set_bool(Object *obj, Visitor *v, const char *name,
     spapr->eff.caps[cap->index] = value ? SPAPR_CAP_ON : SPAPR_CAP_OFF;
 }
 
-static void __attribute__ ((unused)) spapr_cap_get_tristate(Object *obj,
-                                                            Visitor *v,
-                                                            const char *name,
-                                                            void *opaque,
-                                                            Error **errp)
+static void spapr_cap_get_tristate(Object *obj, Visitor *v, const char *name,
+                                   void *opaque, Error **errp)
 {
     sPAPRCapabilityInfo *cap = opaque;
     sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
@@ -103,11 +100,8 @@ static void __attribute__ ((unused)) spapr_cap_get_tristate(Object *obj,
     g_free(val);
 }
 
-static void __attribute__ ((unused)) spapr_cap_set_tristate(Object *obj,
-                                                            Visitor *v,
-                                                            const char *name,
-                                                            void *opaque,
-                                                            Error **errp)
+static void spapr_cap_set_tristate(Object *obj, Visitor *v, const char *name,
+                                   void *opaque, Error **errp)
 {
     sPAPRCapabilityInfo *cap = opaque;
     sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
@@ -186,6 +180,18 @@ static void cap_dfp_apply(sPAPRMachineState *spapr, uint8_t val, Error **errp)
     }
 }
 
+static void cap_safe_cache_apply(sPAPRMachineState *spapr, uint8_t val,
+                                 Error **errp)
+{
+    if (tcg_enabled() && val) {
+        /* TODO - for now only allow broken for TCG */
+        error_setg(errp, "Requested safe cache capability level not supported by tcg, try a different value for cap-cfpc");
+    } else if (kvm_enabled() && (val > kvmppc_get_cap_safe_cache())) {
+        error_setg(errp, "Requested safe cache capability level not supported by kvm, try a different value for cap-cfpc");
+    }
+}
+
+#define VALUE_DESC_TRISTATE     " (broken, workaround, fixed)"
 
 sPAPRCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
     [SPAPR_CAP_HTM] = {
@@ -215,6 +221,15 @@ sPAPRCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
         .type = "bool",
         .apply = cap_dfp_apply,
     },
+    [SPAPR_CAP_CFPC] = {
+        .name = "cfpc",
+        .description = "Cache Flush on Privilege Change" VALUE_DESC_TRISTATE,
+        .index = SPAPR_CAP_CFPC,
+        .get = spapr_cap_get_tristate,
+        .set = spapr_cap_set_tristate,
+        .type = "string",
+        .apply = cap_safe_cache_apply,
+    },
 };
 
 static sPAPRCapabilities default_caps_with_cpu(sPAPRMachineState *spapr,
@@ -320,6 +335,7 @@ const VMStateDescription vmstate_spapr_cap_##cap = {    \
 SPAPR_CAP_MIG_STATE(htm, HTM);
 SPAPR_CAP_MIG_STATE(vsx, VSX);
 SPAPR_CAP_MIG_STATE(dfp, DFP);
+SPAPR_CAP_MIG_STATE(cfpc, CFPC);
 
 void spapr_caps_reset(sPAPRMachineState *spapr)
 {