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-rw-r--r--hw/ppc/spapr.c2
-rw-r--r--hw/ppc/spapr_caps.c25
-rw-r--r--hw/ppc/spapr_hcall.c5
-rw-r--r--include/hw/ppc/spapr.h5
-rw-r--r--target/ppc/kvm.c16
-rw-r--r--target/ppc/kvm_ppc.h6
6 files changed, 58 insertions, 1 deletions
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 8e24d7dc50..37fd7a1411 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2097,6 +2097,7 @@ static const VMStateDescription vmstate_spapr = {
         &vmstate_spapr_cap_nested_kvm_hv,
         &vmstate_spapr_dtb,
         &vmstate_spapr_cap_large_decr,
+        &vmstate_spapr_cap_ccf_assist,
         NULL
     }
 };
@@ -4312,6 +4313,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
     smc->default_caps.caps[SPAPR_CAP_HPT_MAXPAGESIZE] = 16; /* 64kiB */
     smc->default_caps.caps[SPAPR_CAP_NESTED_KVM_HV] = SPAPR_CAP_OFF;
     smc->default_caps.caps[SPAPR_CAP_LARGE_DECREMENTER] = SPAPR_CAP_ON;
+    smc->default_caps.caps[SPAPR_CAP_CCF_ASSIST] = SPAPR_CAP_OFF;
     spapr_caps_add_properties(smc, &error_abort);
     smc->irq = &spapr_irq_xics;
     smc->dr_phb_enabled = true;
diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index ca35b5153d..c5d381f183 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -441,6 +441,21 @@ static void cap_large_decr_cpu_apply(sPAPRMachineState *spapr,
     ppc_store_lpcr(cpu, lpcr);
 }
 
+static void cap_ccf_assist_apply(sPAPRMachineState *spapr, uint8_t val,
+                                 Error **errp)
+{
+    uint8_t kvm_val = kvmppc_get_cap_count_cache_flush_assist();
+
+    if (tcg_enabled() && val) {
+        /* TODO - for now only allow broken for TCG */
+        error_setg(errp,
+"Requested count cache flush assist capability level not supported by tcg, try cap-ccf-assist=off");
+    } else if (kvm_enabled() && (val > kvm_val)) {
+        error_setg(errp,
+"Requested count cache flush assist capability level not supported by kvm, try cap-ccf-assist=off");
+    }
+}
+
 sPAPRCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
     [SPAPR_CAP_HTM] = {
         .name = "htm",
@@ -530,6 +545,15 @@ sPAPRCapabilityInfo capability_table[SPAPR_CAP_NUM] = {
         .apply = cap_large_decr_apply,
         .cpu_apply = cap_large_decr_cpu_apply,
     },
+    [SPAPR_CAP_CCF_ASSIST] = {
+        .name = "ccf-assist",
+        .description = "Count Cache Flush Assist via HW Instruction",
+        .index = SPAPR_CAP_CCF_ASSIST,
+        .get = spapr_cap_get_bool,
+        .set = spapr_cap_set_bool,
+        .type = "bool",
+        .apply = cap_ccf_assist_apply,
+    },
 };
 
 static sPAPRCapabilities default_caps_with_cpu(sPAPRMachineState *spapr,
@@ -664,6 +688,7 @@ SPAPR_CAP_MIG_STATE(sbbc, SPAPR_CAP_SBBC);
 SPAPR_CAP_MIG_STATE(ibs, SPAPR_CAP_IBS);
 SPAPR_CAP_MIG_STATE(nested_kvm_hv, SPAPR_CAP_NESTED_KVM_HV);
 SPAPR_CAP_MIG_STATE(large_decr, SPAPR_CAP_LARGE_DECREMENTER);
+SPAPR_CAP_MIG_STATE(ccf_assist, SPAPR_CAP_CCF_ASSIST);
 
 void spapr_caps_init(sPAPRMachineState *spapr)
 {
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 4aa8036fc0..15bdd30a12 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1693,6 +1693,8 @@ static target_ulong h_get_cpu_characteristics(PowerPCCPU *cpu,
     uint8_t safe_cache = spapr_get_cap(spapr, SPAPR_CAP_CFPC);
     uint8_t safe_bounds_check = spapr_get_cap(spapr, SPAPR_CAP_SBBC);
     uint8_t safe_indirect_branch = spapr_get_cap(spapr, SPAPR_CAP_IBS);
+    uint8_t count_cache_flush_assist = spapr_get_cap(spapr,
+                                                     SPAPR_CAP_CCF_ASSIST);
 
     switch (safe_cache) {
     case SPAPR_CAP_WORKAROUND:
@@ -1733,6 +1735,9 @@ static target_ulong h_get_cpu_characteristics(PowerPCCPU *cpu,
         break;
     case SPAPR_CAP_WORKAROUND:
         behaviour |= H_CPU_BEHAV_FLUSH_COUNT_CACHE;
+        if (count_cache_flush_assist) {
+            characteristics |= H_CPU_CHAR_BCCTR_FLUSH_ASSIST;
+        }
         break;
     default: /* broken */
         assert(safe_indirect_branch == SPAPR_CAP_BROKEN);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index a7f3b1bfdd..ff1bd60615 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -76,8 +76,10 @@ typedef enum {
 #define SPAPR_CAP_NESTED_KVM_HV         0x07
 /* Large Decrementer */
 #define SPAPR_CAP_LARGE_DECREMENTER     0x08
+/* Count Cache Flush Assist HW Instruction */
+#define SPAPR_CAP_CCF_ASSIST            0x09
 /* Num Caps */
-#define SPAPR_CAP_NUM                   (SPAPR_CAP_LARGE_DECREMENTER + 1)
+#define SPAPR_CAP_NUM                   (SPAPR_CAP_CCF_ASSIST + 1)
 
 /*
  * Capability Values
@@ -838,6 +840,7 @@ extern const VMStateDescription vmstate_spapr_cap_sbbc;
 extern const VMStateDescription vmstate_spapr_cap_ibs;
 extern const VMStateDescription vmstate_spapr_cap_nested_kvm_hv;
 extern const VMStateDescription vmstate_spapr_cap_large_decr;
+extern const VMStateDescription vmstate_spapr_cap_ccf_assist;
 
 static inline uint8_t spapr_get_cap(sPAPRMachineState *spapr, int cap)
 {
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index 4d46314276..1da28039a8 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -90,6 +90,7 @@ static int cap_ppc_pvr_compat;
 static int cap_ppc_safe_cache;
 static int cap_ppc_safe_bounds_check;
 static int cap_ppc_safe_indirect_branch;
+static int cap_ppc_count_cache_flush_assist;
 static int cap_ppc_nested_kvm_hv;
 static int cap_large_decr;
 
@@ -2407,6 +2408,14 @@ static int parse_cap_ppc_safe_indirect_branch(struct kvm_ppc_cpu_char c)
     return 0;
 }
 
+static int parse_cap_ppc_count_cache_flush_assist(struct kvm_ppc_cpu_char c)
+{
+    if (c.character & c.character_mask & H_CPU_CHAR_BCCTR_FLUSH_ASSIST) {
+        return 1;
+    }
+    return 0;
+}
+
 static void kvmppc_get_cpu_characteristics(KVMState *s)
 {
     struct kvm_ppc_cpu_char c;
@@ -2429,6 +2438,8 @@ static void kvmppc_get_cpu_characteristics(KVMState *s)
     cap_ppc_safe_cache = parse_cap_ppc_safe_cache(c);
     cap_ppc_safe_bounds_check = parse_cap_ppc_safe_bounds_check(c);
     cap_ppc_safe_indirect_branch = parse_cap_ppc_safe_indirect_branch(c);
+    cap_ppc_count_cache_flush_assist =
+        parse_cap_ppc_count_cache_flush_assist(c);
 }
 
 int kvmppc_get_cap_safe_cache(void)
@@ -2446,6 +2457,11 @@ int kvmppc_get_cap_safe_indirect_branch(void)
     return cap_ppc_safe_indirect_branch;
 }
 
+int kvmppc_get_cap_count_cache_flush_assist(void)
+{
+    return cap_ppc_count_cache_flush_assist;
+}
+
 bool kvmppc_has_cap_nested_kvm_hv(void)
 {
     return !!cap_ppc_nested_kvm_hv;
diff --git a/target/ppc/kvm_ppc.h b/target/ppc/kvm_ppc.h
index a79835bd14..2937b36cae 100644
--- a/target/ppc/kvm_ppc.h
+++ b/target/ppc/kvm_ppc.h
@@ -62,6 +62,7 @@ bool kvmppc_has_cap_mmu_hash_v3(void);
 int kvmppc_get_cap_safe_cache(void);
 int kvmppc_get_cap_safe_bounds_check(void);
 int kvmppc_get_cap_safe_indirect_branch(void);
+int kvmppc_get_cap_count_cache_flush_assist(void);
 bool kvmppc_has_cap_nested_kvm_hv(void);
 int kvmppc_set_cap_nested_kvm_hv(int enable);
 int kvmppc_get_cap_large_decr(void);
@@ -324,6 +325,11 @@ static inline int kvmppc_get_cap_safe_indirect_branch(void)
     return 0;
 }
 
+static inline int kvmppc_get_cap_count_cache_flush_assist(void)
+{
+    return 0;
+}
+
 static inline bool kvmppc_has_cap_nested_kvm_hv(void)
 {
     return false;